Merge pull request #295 from iluwatar/JaXt0r-publish-subscribe
Jaxt0r publish subscribe
This commit is contained in:
Ilkka Seppälä
commit
899b9617c9
1
pom.xml
1
pom.xml
@ -85,6 +85,7 @@
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<module>fluentinterface</module>
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<module>reactor</module>
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<module>caching</module>
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<module>publish-subscribe</module>
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</modules>
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<dependencyManagement>
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1
publish-subscribe/.gitignore
vendored
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1
publish-subscribe/.gitignore
vendored
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/target/
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BIN
publish-subscribe/etc/publish-subscribe.png
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publish-subscribe/etc/publish-subscribe.png
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218
publish-subscribe/etc/publish-subscribe.ucls
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218
publish-subscribe/etc/publish-subscribe.ucls
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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagram version="1.1.8" icons="true" always-add-relationships="false" generalizations="true" realizations="true"
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associations="true" dependencies="false" nesting-relationships="true">
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<class id="1" language="java" name="org.apache.camel.builder.RouteBuilder" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<interface id="2" language="java" name="org.apache.camel.RoutesBuilder" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<class id="3" language="java" name="org.apache.camel.model.RouteDefinition" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="574" y="421"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<class id="4" language="java" name="org.apache.camel.model.RoutesDefinition" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="574" y="526"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<class id="5" language="java" name="org.apache.camel.model.MulticastDefinition" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="574" y="68"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<class id="6" language="java" name="org.apache.camel.model.OutputDefinition" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="576" y="164"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<class id="7" language="java" name="org.apache.camel.model.ProcessorDefinition" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="575" y="284"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<interface id="8" language="java" name="org.apache.camel.CamelContext" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_LEFT">
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<position height="-1" width="-1" x="1086" y="346"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<interface id="9" language="java" name="org.apache.camel.model.ModelCamelContext" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_LEFT">
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<position height="-1" width="-1" x="1086" y="526"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<class id="10" language="java" name="org.apache.camel.impl.DefaultCamelContext" project="message-channel"
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file="D:/Users/mdaehner/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="885" y="421"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</display>
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</class>
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<realization id="11">
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<end type="SOURCE" refId="10"/>
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<end type="TARGET" refId="9"/>
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</realization>
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<generalization id="12">
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<end type="SOURCE" refId="6"/>
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<end type="TARGET" refId="7"/>
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</generalization>
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<association id="13">
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<end type="SOURCE" refId="6" navigable="false">
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<attribute id="14" name="outputs">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="15" minimum="0" maximum="2147483647">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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</end>
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<end type="TARGET" refId="7" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<realization id="16">
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<end type="SOURCE" refId="1"/>
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<end type="TARGET" refId="2"/>
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</realization>
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<generalization id="17">
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<end type="SOURCE" refId="3"/>
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<end type="TARGET" refId="7"/>
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</generalization>
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<association id="18">
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<end type="SOURCE" refId="4" navigable="false">
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<attribute id="19" name="camelContext">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="20" minimum="0" maximum="1">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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</end>
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<end type="TARGET" refId="9" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<association id="21">
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<end type="SOURCE" refId="7" navigable="false">
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<attribute id="22" name="parent">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="23" minimum="0" maximum="1">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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</end>
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<end type="TARGET" refId="7" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<association id="24">
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<end type="SOURCE" refId="1" navigable="false">
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<attribute id="25" name="routeCollection">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="26" minimum="0" maximum="1">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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<end type="TARGET" refId="4" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<association id="27">
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<end type="SOURCE" refId="10" navigable="false">
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<attribute id="28" name="routeDefinitions">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="29" minimum="0" maximum="2147483647">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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</end>
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<end type="TARGET" refId="3" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<association id="30">
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<end type="SOURCE" refId="3" navigable="false">
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<attribute id="31" name="outputs">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="32" minimum="0" maximum="2147483647">
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<position height="0" width="0" x="0" y="0"/>
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</end>
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<end type="TARGET" refId="7" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<generalization id="33">
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<end type="SOURCE" refId="9"/>
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<end type="TARGET" refId="8"/>
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</generalization>
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<association id="34">
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<end type="SOURCE" refId="4" navigable="false">
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<attribute id="35" name="routes">
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<position height="0" width="0" x="0" y="0"/>
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</attribute>
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<multiplicity id="36" minimum="0" maximum="2147483647">
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<position height="0" width="0" x="0" y="0"/>
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</multiplicity>
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</end>
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<end type="TARGET" refId="3" navigable="true"/>
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<display labels="true" multiplicity="true"/>
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</association>
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<generalization id="37">
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<end type="SOURCE" refId="5"/>
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<end type="TARGET" refId="6"/>
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</generalization>
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<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="false"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="false"/>
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</classifier-display>
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<association-display labels="true" multiplicity="true"/>
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</class-diagram>
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16
publish-subscribe/index.md
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16
publish-subscribe/index.md
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@ -0,0 +1,16 @@
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---
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layout: pattern
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title: Publish Subscribe
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folder: publish-subscribe
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permalink: /patterns/publish-subscribe/
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categories: Integration
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tags: Java
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---
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**Intent:** Broadcast messages from sender to all the interested receivers.
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**Applicability:** Use the Publish Subscribe Channel pattern when
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* two or more applications need to communicate using a messaging system for broadcasts.
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24
publish-subscribe/pom.xml
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24
publish-subscribe/pom.xml
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@ -0,0 +1,24 @@
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>java-design-patterns</artifactId>
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<version>1.8.0-SNAPSHOT</version>
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</parent>
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<artifactId>publish-subscribe</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.apache.camel</groupId>
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<artifactId>camel-core</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apache.camel</groupId>
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<artifactId>camel-stream</artifactId>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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</dependency>
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</dependencies>
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</project>
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@ -0,0 +1,50 @@
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package com.iluwatar.publish.subscribe;
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import org.apache.camel.CamelContext;
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import org.apache.camel.ProducerTemplate;
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import org.apache.camel.builder.RouteBuilder;
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import org.apache.camel.impl.DefaultCamelContext;
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/**
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*
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* There are well-established patterns for implementing broadcasting. The Observer pattern describes
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* the need to decouple observers from their subject (that is, the originator of the event) so that
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* the subject can easily provide event notification to all interested observers no matter how many
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* observers there are (even none). The Publish-Subscribe pattern expands upon Observer by adding
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* the notion of an event channel for communicating event notifications.
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* <p>
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* A Publish-Subscribe Channel works like this: It has one input channel that splits into multiple
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* output channels, one for each subscriber. When an event is published into the channel, the
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* Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each
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* output end of the channel has only one subscriber, which is allowed to consume a message only
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* once. In this way, each subscriber gets the message only once, and consumed copies disappear from
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* their channels.
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* <p>
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* In this example we use Apache Camel to establish a Publish-Subscribe Channel from "direct-origin"
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* to "mock:foo", "mock:bar" and "stream:out".
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*
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*/
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public class App {
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/**
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* Program entry point
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*
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* @param args
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* command line args
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* @throws Exception
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*/
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public static void main(String[] args) throws Exception {
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CamelContext context = new DefaultCamelContext();
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context.addRoutes(new RouteBuilder() {
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@Override
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public void configure() throws Exception {
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from("direct:origin").multicast().to("mock:foo", "mock:bar", "stream:out");
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}
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});
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ProducerTemplate template = context.createProducerTemplate();
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context.start();
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context.getRoutes().stream().forEach((r) -> System.out.println(r));
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template.sendBody("direct:origin", "Hello from origin");
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context.stop();
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}
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}
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@ -0,0 +1,17 @@
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package com.iluwatar.publish.subscribe;
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import org.junit.Test;
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/**
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*
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* Application test
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*
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*/
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public class AppTest {
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@Test
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public void test() throws Exception {
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String[] args = {};
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App.main(args);
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}
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}
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