Merge branch 'master' of https://github.com/iluwatar/java-design-patterns
# Conflicts: # pom.xml
This commit is contained in:
nikhilbarar
commit
fc87f8b7d3
39
acyclic-visitor/README.md
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39
acyclic-visitor/README.md
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|||||||
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---
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layout: pattern
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title: Acyclic Visitor
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folder: acyclic-visitor
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permalink: /patterns/acyclic-visitor/
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categories: Behavioral
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tags:
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- Java
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- Difficulty-Intermediate
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---
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## Intent
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Allow new functions to be added to existing class hierarchies without affecting those hierarchies, and without creating the troublesome dependency cycles that are inherent to the GOF VISITOR Pattern.
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## Applicability
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This pattern can be used:
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* When you need to add a new function to an existing hierarchy without the need to alter or affect that hierarchy.
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* When there are functions that operate upon a hierarchy, but which do not belong in the hierarchy itself. e.g. the ConfigureForDOS / ConfigureForUnix / ConfigureForX issue.
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* When you need to perform very different operations on an object depending upon its type.
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* When the visited class hierarchy will be frequently extended with new derivatives of the Element class.
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* When the recompilation, relinking, retesting or redistribution of the derivatives of Element is very expensive.
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## Consequences
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The good:
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* No dependency cycles between class hierarchies.
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* No need to recompile all the visitors if a new one is added.
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* Does not cause compilation failure in existing visitors if class hierarchy has a new member.
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The bad:
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|
* Violates the principle of least surprise or Liskov's Substitution principle by showing that it can accept all visitors but actually only being interested in particular visitors.
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* Parallel hierarchy of visitors has to be created for all members in visitable class hierarchy.
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## Related patterns
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|
* [Visitor Pattern](../visitor/README.md)
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## Credits
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* [Acyclic Visitor](http://condor.depaul.edu/dmumaugh/OOT/Design-Principles/acv.pdf)
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115
acyclic-visitor/etc/Acyclic Visitor.ucls
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115
acyclic-visitor/etc/Acyclic Visitor.ucls
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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagram version="1.2.2" icons="true" always-add-relationships="false" generalizations="true" realizations="true"
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associations="true" dependencies="false" nesting-relationships="true" router="FAN">
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<interface id="1" language="java" name="com.iluwatar.acyclicvisitor.ModemVisitor" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ModemVisitor.java" binary="false"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="860" y="67"/>
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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|
sort-features="false" accessors="true" visibility="true">
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|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
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|
<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</interface>
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<class id="2" language="java" name="com.iluwatar.acyclicvisitor.Modem" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Modem.java" binary="false" corner="BOTTOM_RIGHT">
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|
<position height="-1" width="-1" x="327" y="77"/>
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
|
||||||
|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
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|
<operations public="true" package="true" protected="true" private="true" static="true"/>
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|
</display>
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|
</class>
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|
<class id="3" language="java" name="com.iluwatar.acyclicvisitor.ConfigureForUnixVisitor" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitor.java" binary="false"
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|
corner="BOTTOM_RIGHT">
|
||||||
|
<position height="124" width="196" x="647" y="225"/>
|
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
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|
<operations public="true" package="true" protected="true" private="true" static="true"/>
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|
</display>
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|
</class>
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|
<class id="4" language="java" name="com.iluwatar.acyclicvisitor.Zoom" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Zoom.java" binary="false" corner="BOTTOM_RIGHT">
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|
<position height="-1" width="-1" x="203" y="305"/>
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
</display>
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|
</class>
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|
<interface id="5" language="java" name="com.iluwatar.acyclicvisitor.HayesVisitor" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/HayesVisitor.java" binary="false"
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|
corner="BOTTOM_RIGHT">
|
||||||
|
<position height="-1" width="-1" x="1019" y="468"/>
|
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
|
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|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
</display>
|
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|
</interface>
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<interface id="6" language="java" name="com.iluwatar.acyclicvisitor.ZoomVisitor" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ZoomVisitor.java" binary="false"
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|
corner="BOTTOM_RIGHT">
|
||||||
|
<position height="-1" width="-1" x="758" y="467"/>
|
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|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
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||||||
|
</display>
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||||||
|
</interface>
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<class id="7" language="java" name="com.iluwatar.acyclicvisitor.Hayes" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Hayes.java" binary="false" corner="BOTTOM_RIGHT">
|
||||||
|
<position height="-1" width="-1" x="479" y="307"/>
|
||||||
|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
</display>
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|
</class>
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||||||
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<class id="8" language="java" name="com.iluwatar.acyclicvisitor.ConfigureForDosVisitor" project="acyclic-visitor"
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file="/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForDosVisitor.java" binary="false"
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|
corner="BOTTOM_RIGHT">
|
||||||
|
<position height="142" width="192" x="883" y="225"/>
|
||||||
|
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
|
||||||
|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
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||||||
|
</display>
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||||||
|
</class>
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|
<generalization id="9">
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|
<end type="SOURCE" refId="7"/>
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|
<end type="TARGET" refId="2"/>
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||||||
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</generalization>
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||||||
|
<realization id="10">
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||||||
|
<end type="SOURCE" refId="8"/>
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||||||
|
<end type="TARGET" refId="6"/>
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||||||
|
</realization>
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||||||
|
<realization id="11">
|
||||||
|
<end type="SOURCE" refId="8"/>
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||||||
|
<end type="TARGET" refId="5"/>
|
||||||
|
</realization>
|
||||||
|
<realization id="12">
|
||||||
|
<end type="SOURCE" refId="3"/>
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||||||
|
<end type="TARGET" refId="6"/>
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||||||
|
</realization>
|
||||||
|
<realization id="13">
|
||||||
|
<end type="SOURCE" refId="3"/>
|
||||||
|
<end type="TARGET" refId="1"/>
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||||||
|
</realization>
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||||||
|
<realization id="14">
|
||||||
|
<end type="SOURCE" refId="8"/>
|
||||||
|
<end type="TARGET" refId="1"/>
|
||||||
|
</realization>
|
||||||
|
<generalization id="15">
|
||||||
|
<end type="SOURCE" refId="4"/>
|
||||||
|
<end type="TARGET" refId="2"/>
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||||||
|
</generalization>
|
||||||
|
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
|
||||||
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sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
<operations public="true" package="true" protected="true" private="true" static="true"/>
|
||||||
|
</classifier-display>
|
||||||
|
<association-display labels="true" multiplicity="true"/>
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||||||
|
</class-diagram>
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BIN
acyclic-visitor/etc/acyclic-visitor.png
Normal file
BIN
acyclic-visitor/etc/acyclic-visitor.png
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Binary file not shown.
|
After Width: | Height: | Size: 26 KiB |
76
acyclic-visitor/pom.xml
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76
acyclic-visitor/pom.xml
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@ -0,0 +1,76 @@
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|
<!--
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||||||
|
|
||||||
|
The MIT License
|
||||||
|
Copyright (c) 2014 Ilkka Seppälä
|
||||||
|
|
||||||
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
of this software and associated documentation files (the "Software"), to deal
|
||||||
|
in the Software without restriction, including without limitation the rights
|
||||||
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
copies of the Software, and to permit persons to whom the Software is
|
||||||
|
furnished to do so, subject to the following conditions:
|
||||||
|
|
||||||
|
The above copyright notice and this permission notice shall be included in
|
||||||
|
all copies or substantial portions of the Software.
|
||||||
|
|
||||||
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
THE SOFTWARE.
|
||||||
|
|
||||||
|
-->
|
||||||
|
<project xmlns="http://maven.apache.org/POM/4.0.0"
|
||||||
|
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||||
|
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||||
|
<modelVersion>4.0.0</modelVersion>
|
||||||
|
|
||||||
|
<parent>
|
||||||
|
<groupId>com.iluwatar</groupId>
|
||||||
|
<artifactId>java-design-patterns</artifactId>
|
||||||
|
<version>1.20.0-SNAPSHOT</version>
|
||||||
|
</parent>
|
||||||
|
|
||||||
|
<artifactId>acyclic-visitor</artifactId>
|
||||||
|
|
||||||
|
<properties>
|
||||||
|
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||||
|
<maven.compiler.source>1.8</maven.compiler.source>
|
||||||
|
<maven.compiler.target>1.8</maven.compiler.target>
|
||||||
|
</properties>
|
||||||
|
|
||||||
|
<dependencies>
|
||||||
|
<!-- https://mvnrepository.com/artifact/org.assertj/assertj-core -->
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.assertj</groupId>
|
||||||
|
<artifactId>assertj-core</artifactId>
|
||||||
|
<version>3.9.1</version>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
<!-- https://mvnrepository.com/artifact/uk.org.lidalia/slf4j-test -->
|
||||||
|
<dependency>
|
||||||
|
<groupId>uk.org.lidalia</groupId>
|
||||||
|
<artifactId>slf4j-test</artifactId>
|
||||||
|
<version>1.0.0</version>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.junit.jupiter</groupId>
|
||||||
|
<artifactId>junit-jupiter-api</artifactId>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.junit.jupiter</groupId>
|
||||||
|
<artifactId>junit-jupiter-engine</artifactId>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.mockito</groupId>
|
||||||
|
<artifactId>mockito-all</artifactId>
|
||||||
|
<version>1.9.5</version>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
</dependencies>
|
||||||
|
</project>
|
||||||
@ -0,0 +1,30 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* All ModemVisitor interface extends all visitor interfaces
|
||||||
|
*/
|
||||||
|
public interface AllModemVisitor extends ModemVisitor, ZoomVisitor, HayesVisitor{
|
||||||
|
|
||||||
|
}
|
||||||
@ -0,0 +1,55 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The Acyclic Visitor pattern allows new functions to be added to existing class
|
||||||
|
* hierarchies without affecting those hierarchies, and without creating the dependency
|
||||||
|
* cycles that are inherent to the GoF Visitor pattern, by making the Visitor base class
|
||||||
|
* degenerate
|
||||||
|
* <p>
|
||||||
|
* In this example the visitor base class is {@link ModemVisitor}. The base class of the
|
||||||
|
* visited hierarchy is {@link Modem} and has two children {@link Hayes} and {@link Zoom}
|
||||||
|
* each one having its own visitor interface {@link HayesVisitor} and {@link ZoomVisitor}
|
||||||
|
* respectively. {@link ConfigureForUnixVisitor} and {@link ConfigureForDosVisitor}
|
||||||
|
* implement each derivative's visit method only if it is required
|
||||||
|
*/
|
||||||
|
public class App {
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Program's entry point
|
||||||
|
*/
|
||||||
|
|
||||||
|
public static void main(String[] args) {
|
||||||
|
ConfigureForUnixVisitor conUnix = new ConfigureForUnixVisitor();
|
||||||
|
ConfigureForDosVisitor conDos = new ConfigureForDosVisitor();
|
||||||
|
|
||||||
|
Zoom zoom = new Zoom();
|
||||||
|
Hayes hayes = new Hayes();
|
||||||
|
|
||||||
|
hayes.accept(conDos); // Hayes modem with Unix configurator
|
||||||
|
zoom.accept(conDos); // Zoom modem with Dos configurator
|
||||||
|
hayes.accept(conUnix); // Hayes modem with Unix configurator
|
||||||
|
zoom.accept(conUnix); // Zoom modem with Unix configurator
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,43 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ConfigureForDosVisitor class implements both zoom's and hayes' visit method
|
||||||
|
* for Dos manufacturer
|
||||||
|
*/
|
||||||
|
public class ConfigureForDosVisitor implements AllModemVisitor {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
public void visit(Hayes hayes) {
|
||||||
|
LOGGER.info(hayes + " used with Dos configurator.");
|
||||||
|
}
|
||||||
|
|
||||||
|
public void visit(Zoom zoom) {
|
||||||
|
LOGGER.info(zoom + " used with Dos configurator.");
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,39 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ConfigureForUnixVisitor class implements zoom's visit method for Unix
|
||||||
|
* manufacturer
|
||||||
|
*/
|
||||||
|
public class ConfigureForUnixVisitor implements ModemVisitor, ZoomVisitor {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForUnixVisitor.class);
|
||||||
|
|
||||||
|
public void visit(Zoom zoom) {
|
||||||
|
LOGGER.info(zoom + " used with Unix configurator.");
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,56 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Hayes class implements its accept method
|
||||||
|
*/
|
||||||
|
public class Hayes extends Modem {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Accepts all visitors but honors only HayesVisitor
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public void accept(ModemVisitor modemVisitor) {
|
||||||
|
try {
|
||||||
|
((HayesVisitor) modemVisitor).visit(this);
|
||||||
|
} catch (ClassCastException e) {
|
||||||
|
LOGGER.error("Unable to cast to HayesVisitor");
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Hayes' modem's toString
|
||||||
|
* method
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public String toString() {
|
||||||
|
return "Hayes modem";
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,30 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* HayesVisitor interface
|
||||||
|
*/
|
||||||
|
public interface HayesVisitor extends ModemVisitor {
|
||||||
|
void visit(Hayes hayes);
|
||||||
|
}
|
||||||
@ -0,0 +1,30 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Modem abstract class
|
||||||
|
*/
|
||||||
|
public abstract class Modem {
|
||||||
|
public abstract void accept(ModemVisitor modemVisitor);
|
||||||
|
}
|
||||||
@ -0,0 +1,32 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ModemVisitor interface does not contain any visit methods so that it does not
|
||||||
|
* depend on the visited hierarchy. Each derivative's visit method is declared in
|
||||||
|
* its own visitor interface
|
||||||
|
*/
|
||||||
|
public interface ModemVisitor {
|
||||||
|
// Visitor is a degenerate base class for all visitors.
|
||||||
|
}
|
||||||
@ -0,0 +1,55 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Zoom class implements its accept method
|
||||||
|
*/
|
||||||
|
public class Zoom extends Modem {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Accepts all visitors but honors only ZoomVisitor
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public void accept(ModemVisitor modemVisitor) {
|
||||||
|
try {
|
||||||
|
((ZoomVisitor) modemVisitor).visit(this);
|
||||||
|
} catch (ClassCastException e) {
|
||||||
|
LOGGER.error("Unable to cast to ZoomVisitor");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Zoom modem's toString
|
||||||
|
* method
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public String toString() {
|
||||||
|
return "Zoom modem";
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,30 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ZoomVisitor interface
|
||||||
|
*/
|
||||||
|
public interface ZoomVisitor extends ModemVisitor{
|
||||||
|
void visit(Zoom zoom);
|
||||||
|
}
|
||||||
@ -0,0 +1,39 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
import com.iluwatar.acyclicvisitor.App;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Tests that the Acyclic Visitor example runs without errors.
|
||||||
|
*/
|
||||||
|
public class AppTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() {
|
||||||
|
String[] args = {};
|
||||||
|
App.main(args);
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,75 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import static org.assertj.core.api.Assertions.assertThat;
|
||||||
|
import static org.assertj.core.groups.Tuple.tuple;
|
||||||
|
import static org.mockito.Mockito.mock;
|
||||||
|
import static uk.org.lidalia.slf4jext.Level.INFO;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.AfterEach;
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForDosVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Hayes;
|
||||||
|
import com.iluwatar.acyclicvisitor.HayesVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Zoom;
|
||||||
|
import com.iluwatar.acyclicvisitor.ZoomVisitor;
|
||||||
|
|
||||||
|
import uk.org.lidalia.slf4jtest.TestLogger;
|
||||||
|
import uk.org.lidalia.slf4jtest.TestLoggerFactory;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ConfigureForDosVisitor test class
|
||||||
|
*/
|
||||||
|
public class ConfigureForDosVisitorTest {
|
||||||
|
|
||||||
|
TestLogger logger = TestLoggerFactory.getTestLogger(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testVisitForZoom() {
|
||||||
|
ConfigureForDosVisitor conDos = new ConfigureForDosVisitor();
|
||||||
|
Zoom zoom = new Zoom();
|
||||||
|
|
||||||
|
conDos.visit(zoom);
|
||||||
|
|
||||||
|
assertThat(logger.getLoggingEvents()).extracting("level", "message").contains(
|
||||||
|
tuple(INFO, zoom + " used with Dos configurator."));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testVisitForHayes() {
|
||||||
|
ConfigureForDosVisitor conDos = new ConfigureForDosVisitor();
|
||||||
|
Hayes hayes = new Hayes();
|
||||||
|
|
||||||
|
conDos.visit(hayes);
|
||||||
|
|
||||||
|
assertThat(logger.getLoggingEvents()).extracting("level", "message").contains(
|
||||||
|
tuple(INFO, hayes + " used with Dos configurator."));
|
||||||
|
}
|
||||||
|
|
||||||
|
@AfterEach
|
||||||
|
public void clearLoggers() {
|
||||||
|
TestLoggerFactory.clear();
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,65 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import static org.assertj.core.api.Assertions.assertThat;
|
||||||
|
import static org.assertj.core.groups.Tuple.tuple;
|
||||||
|
import static uk.org.lidalia.slf4jext.Level.INFO;
|
||||||
|
import static org.mockito.Mockito.mock;
|
||||||
|
|
||||||
|
import uk.org.lidalia.slf4jtest.TestLogger;
|
||||||
|
import uk.org.lidalia.slf4jtest.TestLoggerFactory;
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForUnixVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Hayes;
|
||||||
|
import com.iluwatar.acyclicvisitor.HayesVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Zoom;
|
||||||
|
import com.iluwatar.acyclicvisitor.ZoomVisitor;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.AfterEach;
|
||||||
|
import org.junit.jupiter.api.Assertions;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* ConfigureForUnixVisitor test class
|
||||||
|
*/
|
||||||
|
public class ConfigureForUnixVisitorTest {
|
||||||
|
|
||||||
|
TestLogger logger = TestLoggerFactory.getTestLogger(ConfigureForUnixVisitor.class);
|
||||||
|
|
||||||
|
@AfterEach
|
||||||
|
public void clearLoggers() {
|
||||||
|
TestLoggerFactory.clear();
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testVisitForZoom() {
|
||||||
|
ConfigureForUnixVisitor conUnix = new ConfigureForUnixVisitor();
|
||||||
|
Zoom zoom = new Zoom();
|
||||||
|
|
||||||
|
conUnix.visit(zoom);
|
||||||
|
|
||||||
|
assertThat(logger.getLoggingEvents()).extracting("level", "message").contains(
|
||||||
|
tuple(INFO, zoom + " used with Unix configurator."));
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,60 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
import static org.mockito.Matchers.eq;
|
||||||
|
import static org.mockito.Mockito.mock;
|
||||||
|
import static org.mockito.Mockito.verify;
|
||||||
|
import static org.mockito.Mockito.verifyZeroInteractions;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForDosVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForUnixVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Hayes;
|
||||||
|
import com.iluwatar.acyclicvisitor.HayesVisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Hayes test class
|
||||||
|
*/
|
||||||
|
public class HayesTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testAcceptForDos() {
|
||||||
|
Hayes hayes = new Hayes();
|
||||||
|
ConfigureForDosVisitor mockVisitor = mock(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
hayes.accept(mockVisitor);
|
||||||
|
verify((HayesVisitor)mockVisitor).visit(eq(hayes));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testAcceptForUnix() {
|
||||||
|
Hayes hayes = new Hayes();
|
||||||
|
ConfigureForUnixVisitor mockVisitor = mock(ConfigureForUnixVisitor.class);
|
||||||
|
|
||||||
|
hayes.accept(mockVisitor);
|
||||||
|
|
||||||
|
verifyZeroInteractions(mockVisitor);
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,59 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.acyclicvisitor;
|
||||||
|
|
||||||
|
|
||||||
|
import static org.mockito.Matchers.eq;
|
||||||
|
import static org.mockito.Mockito.verify;
|
||||||
|
import static org.mockito.Mockito.mock;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForDosVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.ConfigureForUnixVisitor;
|
||||||
|
import com.iluwatar.acyclicvisitor.Zoom;
|
||||||
|
import com.iluwatar.acyclicvisitor.ZoomVisitor;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Zoom test class
|
||||||
|
*/
|
||||||
|
public class ZoomTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testAcceptForDos() {
|
||||||
|
Zoom zoom = new Zoom();
|
||||||
|
ConfigureForDosVisitor mockVisitor = mock(ConfigureForDosVisitor.class);
|
||||||
|
|
||||||
|
zoom.accept(mockVisitor);
|
||||||
|
verify((ZoomVisitor)mockVisitor).visit(eq(zoom));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testAcceptForUnix() {
|
||||||
|
Zoom zoom = new Zoom();
|
||||||
|
ConfigureForUnixVisitor mockVisitor = mock(ConfigureForUnixVisitor.class);
|
||||||
|
|
||||||
|
zoom.accept(mockVisitor);
|
||||||
|
verify((ZoomVisitor)mockVisitor).visit(eq(zoom));
|
||||||
|
}
|
||||||
|
}
|
||||||
178
ambassador/README.md
Normal file
178
ambassador/README.md
Normal file
@ -0,0 +1,178 @@
|
|||||||
|
---
|
||||||
|
layout: pattern
|
||||||
|
title: Ambassador
|
||||||
|
folder: ambassador
|
||||||
|
permalink: /patterns/ambassador/
|
||||||
|
categories: Structural
|
||||||
|
tags:
|
||||||
|
- Java
|
||||||
|
- Difficulty-Intermediate
|
||||||
|
---
|
||||||
|
|
||||||
|
## Intent
|
||||||
|
Provide a helper service instance on a client and offload common functionality away from a shared resource.
|
||||||
|
|
||||||
|
## Explanation
|
||||||
|
Real world example
|
||||||
|
|
||||||
|
> A remote service has many clients accessing a function it provides. The service is a legacy application and is impossible to update. Large numbers of requests from users are causing connectivity issues. New rules for request frequency should be implemented along with latency checks and client-side logging.
|
||||||
|
|
||||||
|
In plain words
|
||||||
|
|
||||||
|
> Using the ambassador pattern, we can implement less-frequent polling from clients along with latency checks and logging.
|
||||||
|
|
||||||
|
Microsoft documentation states
|
||||||
|
|
||||||
|
> An ambassador service can be thought of as an out-of-process proxy that is co-located with the client.
|
||||||
|
This pattern can be useful for offloading common client connectivity tasks such as monitoring, logging, routing, security (such as TLS), and resiliency patterns in a language agnostic way. It is often used with legacy applications, or other applications that are difficult to modify, in order to extend their networking capabilities. It can also enable a specialized team to implement those features.
|
||||||
|
|
||||||
|
**Programmatic Example**
|
||||||
|
|
||||||
|
With the above example in mind we will imitate the functionality in a simple manner. We have an interface implemented by the remote service as well as the ambassador service:
|
||||||
|
|
||||||
|
```java
|
||||||
|
interface RemoteServiceInterface {
|
||||||
|
|
||||||
|
long doRemoteFunction(int value) throws Exception;
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
A remote services represented as a singleton.
|
||||||
|
|
||||||
|
```java
|
||||||
|
public class RemoteService implements RemoteServiceInterface {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(RemoteService.class);
|
||||||
|
private static RemoteService service = null;2
|
||||||
|
|
||||||
|
static synchronized RemoteService getRemoteService() {
|
||||||
|
if (service == null) {
|
||||||
|
service = new RemoteService();
|
||||||
|
}
|
||||||
|
return service;
|
||||||
|
}
|
||||||
|
|
||||||
|
private RemoteService() {}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public long doRemoteFunction(int value) {
|
||||||
|
|
||||||
|
long waitTime = (long) Math.floor(Math.random() * 1000);
|
||||||
|
|
||||||
|
try {
|
||||||
|
sleep(waitTime);
|
||||||
|
} catch (InterruptedException e) {
|
||||||
|
LOGGER.error("Thread sleep interrupted", e)
|
||||||
|
}
|
||||||
|
return waitTime >= 200 ? value * 10 : -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
A service ambassador adding additional features such as logging, latency checks
|
||||||
|
|
||||||
|
```java
|
||||||
|
public class ServiceAmbassador implements RemoteServiceInterface {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ServiceAmbassador.class);
|
||||||
|
private static final int RETRIES = 3;
|
||||||
|
private static final int DELAY_MS = 3000;
|
||||||
|
|
||||||
|
ServiceAmbassador() {}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public long doRemoteFunction(int value) {
|
||||||
|
|
||||||
|
return safeCall(value);
|
||||||
|
}
|
||||||
|
|
||||||
|
private long checkLatency(int value) {
|
||||||
|
RemoteService service = RemoteService.getRemoteService();
|
||||||
|
long startTime = System.currentTimeMillis();
|
||||||
|
long result = service.doRemoteFunction(value);
|
||||||
|
long timeTaken = System.currentTimeMillis() - startTime;
|
||||||
|
|
||||||
|
LOGGER.info("Time taken (ms): " + timeTaken);
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
private long safeCall(int value) {
|
||||||
|
|
||||||
|
int retries = 0;
|
||||||
|
long result = -1;
|
||||||
|
|
||||||
|
for (int i = 0; i < RETRIES; i++) {
|
||||||
|
|
||||||
|
if (retries >= RETRIES) {
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((result = checkLatency(value)) == -1) {
|
||||||
|
LOGGER.info("Failed to reach remote: (" + (i + 1) + ")");
|
||||||
|
retries++;
|
||||||
|
try {
|
||||||
|
sleep(DELAY_MS);
|
||||||
|
} catch (InterruptedException e) {
|
||||||
|
LOGGER.error("Thread sleep state interrupted", e);
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
A client has a local service ambassador used to interact with the remote service:
|
||||||
|
|
||||||
|
```java
|
||||||
|
public class Client {
|
||||||
|
|
||||||
|
private ServiceAmbassador serviceAmbassador;
|
||||||
|
|
||||||
|
Client() {
|
||||||
|
serviceAmbassador = new ServiceAmbassador();
|
||||||
|
}
|
||||||
|
|
||||||
|
long useService(int value) {
|
||||||
|
long result = serviceAmbassador.doRemoteFunction(value);
|
||||||
|
LOGGER.info("Service result: " + result)
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
And here are two clients using the service.
|
||||||
|
|
||||||
|
```java
|
||||||
|
Client host1 = new Client();
|
||||||
|
Client host2 = new Client();
|
||||||
|
host1.useService(12);
|
||||||
|
host2.useService(73);
|
||||||
|
```
|
||||||
|
|
||||||
|
## Applicability
|
||||||
|
Ambassador is applicable when working with a legacy remote service that cannot
|
||||||
|
be modified or would be extremely difficult to modify. Connectivity features can
|
||||||
|
be implemented on the client avoiding the need for changes on the remote service.
|
||||||
|
|
||||||
|
* Ambassador provides a local interface for a remote service.
|
||||||
|
* Ambassador provides logging, circuit breaking, retries and security on the client.
|
||||||
|
|
||||||
|
## Typical Use Case
|
||||||
|
|
||||||
|
* Control access to another object
|
||||||
|
* Implement logging
|
||||||
|
* Implement circuit breaking
|
||||||
|
* Offload remote service tasks
|
||||||
|
* Facilitate network connection
|
||||||
|
|
||||||
|
## Real world examples
|
||||||
|
|
||||||
|
* [Kubernetes-native API gateway for microservices](https://github.com/datawire/ambassador)
|
||||||
|
|
||||||
|
## Credits
|
||||||
|
|
||||||
|
* [Ambassador pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/ambassador)
|
||||||
|
* [Designing Distributed Systems: Patterns and Paradigms for Scalable, Reliable Services](https://books.google.co.uk/books?id=6BJNDwAAQBAJ&pg=PT35&lpg=PT35&dq=ambassador+pattern+in+real+world&source=bl&ots=d2e7GhYdHi&sig=Lfl_MDnCgn6lUcjzOg4GXrN13bQ&hl=en&sa=X&ved=0ahUKEwjk9L_18rrbAhVpKcAKHX_KA7EQ6AEIWTAI#v=onepage&q=ambassador%20pattern%20in%20real%20world&f=false)
|
||||||
48
ambassador/pom.xml
Normal file
48
ambassador/pom.xml
Normal file
@ -0,0 +1,48 @@
|
|||||||
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
|
<!--
|
||||||
|
|
||||||
|
The MIT License
|
||||||
|
Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
|
||||||
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
of this software and associated documentation files (the "Software"), to deal
|
||||||
|
in the Software without restriction, including without limitation the rights
|
||||||
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
copies of the Software, and to permit persons to whom the Software is
|
||||||
|
furnished to do so, subject to the following conditions:
|
||||||
|
|
||||||
|
The above copyright notice and this permission notice shall be included in
|
||||||
|
all copies or substantial portions of the Software.
|
||||||
|
|
||||||
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
THE SOFTWARE.
|
||||||
|
|
||||||
|
-->
|
||||||
|
<project xmlns="http://maven.apache.org/POM/4.0.0"
|
||||||
|
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||||
|
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||||
|
<parent>
|
||||||
|
<artifactId>java-design-patterns</artifactId>
|
||||||
|
<groupId>com.iluwatar</groupId>
|
||||||
|
<version>1.20.0-SNAPSHOT</version>
|
||||||
|
</parent>
|
||||||
|
<modelVersion>4.0.0</modelVersion>
|
||||||
|
<artifactId>ambassador</artifactId>
|
||||||
|
<dependencies>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.junit.jupiter</groupId>
|
||||||
|
<artifactId>junit-jupiter-api</artifactId>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.junit.jupiter</groupId>
|
||||||
|
<artifactId>junit-jupiter-engine</artifactId>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
</dependencies>
|
||||||
|
</project>
|
||||||
53
ambassador/src/main/java/com/iluwatar/ambassador/App.java
Normal file
53
ambassador/src/main/java/com/iluwatar/ambassador/App.java
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
/**
|
||||||
|
*
|
||||||
|
* The ambassador pattern creates a helper service that sends network requests on behalf of a
|
||||||
|
* client. It is often used in cloud-based applications to offload features of a remote service.
|
||||||
|
*
|
||||||
|
* An ambassador service can be thought of as an out-of-process proxy that is co-located with
|
||||||
|
* the client. Similar to the proxy design pattern, the ambassador service provides an interface
|
||||||
|
* for another remote service. In addition to the interface, the ambassador provides extra
|
||||||
|
* functionality and features, specifically offloaded common connectivity tasks. This usually
|
||||||
|
* consists of monitoring, logging, routing, security etc. This is extremely useful in
|
||||||
|
* legacy applications where the codebase is difficult to modify and allows for improvements
|
||||||
|
* in the application's networking capabilities.
|
||||||
|
*
|
||||||
|
* In this example, we will the ({@link ServiceAmbassador}) class represents the ambassador while the
|
||||||
|
* ({@link RemoteService}) class represents a remote application.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
public class App {
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Entry point
|
||||||
|
*/
|
||||||
|
public static void main(String[] args) {
|
||||||
|
Client host1 = new Client();
|
||||||
|
Client host2 = new Client();
|
||||||
|
host1.useService(12);
|
||||||
|
host2.useService(73);
|
||||||
|
}
|
||||||
|
}
|
||||||
42
ambassador/src/main/java/com/iluwatar/ambassador/Client.java
Normal file
42
ambassador/src/main/java/com/iluwatar/ambassador/Client.java
Normal file
@ -0,0 +1,42 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* A simple Client
|
||||||
|
*/
|
||||||
|
public class Client {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(Client.class);
|
||||||
|
private final ServiceAmbassador serviceAmbassador = new ServiceAmbassador();
|
||||||
|
|
||||||
|
long useService(int value) {
|
||||||
|
long result = serviceAmbassador.doRemoteFunction(value);
|
||||||
|
LOGGER.info("Service result: " + result);
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,65 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
import static java.lang.Thread.sleep;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* A remote legacy application represented by a Singleton implementation.
|
||||||
|
*/
|
||||||
|
public class RemoteService implements RemoteServiceInterface {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(RemoteService.class);
|
||||||
|
private static RemoteService service = null;
|
||||||
|
|
||||||
|
static synchronized RemoteService getRemoteService() {
|
||||||
|
if (service == null) {
|
||||||
|
service = new RemoteService();
|
||||||
|
}
|
||||||
|
return service;
|
||||||
|
}
|
||||||
|
|
||||||
|
private RemoteService() {}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Remote function takes a value and multiplies it by 10 taking a random amount of time.
|
||||||
|
* Will sometimes return -1. This imitates connectivity issues a client might have to account for.
|
||||||
|
* @param value integer value to be multiplied.
|
||||||
|
* @return if waitTime is more than 200ms, it returns value * 10, otherwise -1.
|
||||||
|
*/
|
||||||
|
@Override
|
||||||
|
public long doRemoteFunction(int value) {
|
||||||
|
|
||||||
|
long waitTime = (long) Math.floor(Math.random() * 1000);
|
||||||
|
|
||||||
|
try {
|
||||||
|
sleep(waitTime);
|
||||||
|
} catch (InterruptedException e) {
|
||||||
|
LOGGER.error("Thread sleep state interrupted", e);
|
||||||
|
}
|
||||||
|
return waitTime >= 200 ? value * 10 : -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,31 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Interface shared by ({@link RemoteService}) and ({@link ServiceAmbassador}).
|
||||||
|
*/
|
||||||
|
interface RemoteServiceInterface {
|
||||||
|
|
||||||
|
long doRemoteFunction(int value) throws Exception;
|
||||||
|
}
|
||||||
@ -0,0 +1,84 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
import static java.lang.Thread.sleep;
|
||||||
|
|
||||||
|
/**
|
||||||
|
*
|
||||||
|
* ServiceAmbassador provides an interface for a ({@link Client}) to access ({@link RemoteService}).
|
||||||
|
* The interface adds logging, latency testing and usage of the service in a safe way that will not
|
||||||
|
* add stress to the remote service when connectivity issues occur.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
public class ServiceAmbassador implements RemoteServiceInterface {
|
||||||
|
|
||||||
|
private static final Logger LOGGER = LoggerFactory.getLogger(ServiceAmbassador.class);
|
||||||
|
private static final int RETRIES = 3;
|
||||||
|
private static final int DELAY_MS = 3000;
|
||||||
|
|
||||||
|
ServiceAmbassador() {}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public long doRemoteFunction(int value) {
|
||||||
|
return safeCall(value);
|
||||||
|
}
|
||||||
|
|
||||||
|
private long checkLatency(int value) {
|
||||||
|
long startTime = System.currentTimeMillis();
|
||||||
|
long result = RemoteService.getRemoteService().doRemoteFunction(value);
|
||||||
|
long timeTaken = System.currentTimeMillis() - startTime;
|
||||||
|
|
||||||
|
LOGGER.info("Time taken (ms): " + timeTaken);
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
private long safeCall(int value) {
|
||||||
|
|
||||||
|
int retries = 0;
|
||||||
|
long result = -1;
|
||||||
|
|
||||||
|
for (int i = 0; i < RETRIES; i++) {
|
||||||
|
|
||||||
|
if (retries >= RETRIES) {
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((result = checkLatency(value)) == -1) {
|
||||||
|
LOGGER.info("Failed to reach remote: (" + (i + 1) + ")");
|
||||||
|
retries++;
|
||||||
|
try {
|
||||||
|
sleep(DELAY_MS);
|
||||||
|
} catch (InterruptedException e) {
|
||||||
|
LOGGER.error("Thread sleep state interrupted", e);
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,36 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Application test
|
||||||
|
*/
|
||||||
|
public class AppTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() {
|
||||||
|
App.main(new String[]{});
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,40 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Test for {@link Client}
|
||||||
|
*/
|
||||||
|
public class ClientTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() {
|
||||||
|
|
||||||
|
Client client = new Client();
|
||||||
|
long result = client.useService(10);
|
||||||
|
|
||||||
|
assert result == 100 || result == -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,37 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Test for {@link RemoteService}
|
||||||
|
*/
|
||||||
|
public class RemoteServiceTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() {
|
||||||
|
long result = RemoteService.getRemoteService().doRemoteFunction(10);
|
||||||
|
assert result == 100 || result == -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,37 @@
|
|||||||
|
/**
|
||||||
|
* The MIT License
|
||||||
|
* Copyright (c) 2014-2016 Ilkka Seppälä
|
||||||
|
*
|
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||||
|
* of this software and associated documentation files (the "Software"), to deal
|
||||||
|
* in the Software without restriction, including without limitation the rights
|
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||||
|
* copies of the Software, and to permit persons to whom the Software is
|
||||||
|
* furnished to do so, subject to the following conditions:
|
||||||
|
*
|
||||||
|
* The above copyright notice and this permission notice shall be included in
|
||||||
|
* all copies or substantial portions of the Software.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||||
|
* THE SOFTWARE.
|
||||||
|
*/
|
||||||
|
package com.iluwatar.ambassador;
|
||||||
|
|
||||||
|
import org.junit.jupiter.api.Test;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Test for {@link ServiceAmbassador}
|
||||||
|
*/
|
||||||
|
public class ServiceAmbassadorTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() {
|
||||||
|
long result = new ServiceAmbassador().doRemoteFunction(10);
|
||||||
|
assert result == 100 || result == -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
5
pom.xml
5
pom.xml
@ -161,9 +161,8 @@
|
|||||||
<module>dirty-flag</module>
|
<module>dirty-flag</module>
|
||||||
<module>trampoline</module>
|
<module>trampoline</module>
|
||||||
<module>serverless</module>
|
<module>serverless</module>
|
||||||
<module>component-object</module>
|
<module>ambassador</module>
|
||||||
<module>monitor-object</module>
|
<module>acyclic-visitor</module>
|
||||||
<module>collection-pipeline</module>
|
|
||||||
</modules>
|
</modules>
|
||||||
|
|
||||||
<repositories>
|
<repositories>
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user