Compare commits
2 Commits
master
...
updateMave
Author | SHA1 | Date | |
---|---|---|---|
|
e2e470291e | ||
|
64dd23da05 |
@ -1737,8 +1737,7 @@
|
||||
"avatar_url": "https://avatars.githubusercontent.com/u/47126749?v=4",
|
||||
"profile": "http://no website",
|
||||
"contributions": [
|
||||
"review",
|
||||
"code"
|
||||
"review"
|
||||
]
|
||||
},
|
||||
{
|
||||
@ -1786,24 +1785,6 @@
|
||||
"contributions": [
|
||||
"code"
|
||||
]
|
||||
},
|
||||
{
|
||||
"login": "ShivanshCharak",
|
||||
"name": "ShivanshCharak",
|
||||
"avatar_url": "https://avatars.githubusercontent.com/u/96943825?v=4",
|
||||
"profile": "https://github.com/ShivanshCharak",
|
||||
"contributions": [
|
||||
"code"
|
||||
]
|
||||
},
|
||||
{
|
||||
"login": "HattoriHenzo",
|
||||
"name": "HattoriHenzo",
|
||||
"avatar_url": "https://avatars.githubusercontent.com/u/5141285?v=4",
|
||||
"profile": "https://github.com/HattoriHenzo",
|
||||
"contributions": [
|
||||
"code"
|
||||
]
|
||||
}
|
||||
],
|
||||
"contributorsPerLine": 7,
|
||||
|
1
.gitignore
vendored
1
.gitignore
vendored
@ -12,7 +12,6 @@ tmp/
|
||||
local.properties
|
||||
.loadpath
|
||||
.recommenders
|
||||
.DS_Store
|
||||
|
||||
####### Java annotation processor (APT) ########
|
||||
.factorypath
|
||||
|
@ -10,7 +10,7 @@
|
||||
[](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
|
||||
[](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
||||
<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
|
||||
[](#contributors-)
|
||||
[](#contributors-)
|
||||
<!-- ALL-CONTRIBUTORS-BADGE:END -->
|
||||
|
||||
<br/>
|
||||
@ -320,17 +320,13 @@ This project is licensed under the terms of the MIT license.
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center"><a href="https://www.linkedin.com/in/abhinav-vashisth-06613b208/"><img src="https://avatars.githubusercontent.com/u/89785800?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Abhinav Vashisth</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vashisthabhinav" title="Documentation">📖</a></td>
|
||||
<td align="center"><a href="http://no website"><img src="https://avatars.githubusercontent.com/u/47126749?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kevin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AKevinyl3" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=Kevinyl3" title="Code">💻</a></td>
|
||||
<td align="center"><a href="http://no website"><img src="https://avatars.githubusercontent.com/u/47126749?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kevin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AKevinyl3" title="Reviewed Pull Requests">👀</a></td>
|
||||
<td align="center"><a href="https://github.com/Shrirang97"><img src="https://avatars.githubusercontent.com/u/28738668?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Shrirang</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AShrirang97" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=Shrirang97" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://github.com/interactwithankush"><img src="https://avatars.githubusercontent.com/u/18613127?v=4?s=100" width="100px;" alt=""/><br /><sub><b>interactwithankush</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=interactwithankush" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://github.com/yuhangbin"><img src="https://avatars.githubusercontent.com/u/17566866?v=4?s=100" width="100px;" alt=""/><br /><sub><b>CharlieYu</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=yuhangbin" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://github.com/Leisterbecker"><img src="https://avatars.githubusercontent.com/u/20650323?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Leisterbecker</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Leisterbecker" title="Code">💻</a></td>
|
||||
<td align="center"><a href="http://rosaecrucis.cn"><img src="https://avatars.githubusercontent.com/u/35420129?v=4?s=100" width="100px;" alt=""/><br /><sub><b>DragonDreamer</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=castleKing1997" title="Code">💻</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center"><a href="https://github.com/ShivanshCharak"><img src="https://avatars.githubusercontent.com/u/96943825?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ShivanshCharak</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ShivanshCharak" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://github.com/HattoriHenzo"><img src="https://avatars.githubusercontent.com/u/5141285?v=4?s=100" width="100px;" alt=""/><br /><sub><b>HattoriHenzo</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=HattoriHenzo" title="Code">💻</a></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<!-- markdownlint-restore -->
|
||||
|
@ -29,7 +29,7 @@ import lombok.extern.slf4j.Slf4j;
|
||||
* Hayes class implements its accept method.
|
||||
*/
|
||||
@Slf4j
|
||||
public class Hayes implements Modem {
|
||||
public class Hayes extends Modem {
|
||||
|
||||
/**
|
||||
* Accepts all visitors but honors only HayesVisitor.
|
||||
|
@ -24,9 +24,8 @@
|
||||
package com.iluwatar.acyclicvisitor;
|
||||
|
||||
/**
|
||||
* //Modem abstract class.
|
||||
* converted to an interface
|
||||
* Modem abstract class.
|
||||
*/
|
||||
public interface Modem {
|
||||
void accept(ModemVisitor modemVisitor);
|
||||
public abstract class Modem {
|
||||
public abstract void accept(ModemVisitor modemVisitor);
|
||||
}
|
||||
|
@ -29,7 +29,7 @@ import lombok.extern.slf4j.Slf4j;
|
||||
* Zoom class implements its accept method.
|
||||
*/
|
||||
@Slf4j
|
||||
public class Zoom implements Modem {
|
||||
public class Zoom extends Modem {
|
||||
|
||||
/**
|
||||
* Accepts all visitors but honors only ZoomVisitor.
|
||||
|
@ -1,325 +0,0 @@
|
||||
---
|
||||
layout: pattern
|
||||
title: Composite View
|
||||
folder: composite-view
|
||||
permalink: /patterns/composite-view/
|
||||
categories: Structural
|
||||
language: en
|
||||
tags:
|
||||
- Enterprise Integration Pattern
|
||||
- Presentation
|
||||
---
|
||||
|
||||
## Name
|
||||
**Composite View**
|
||||
|
||||
## Intent
|
||||
The purpose of the Composite View Pattern is to increase re-usability and flexibility when creating views for websites/webapps.
|
||||
This pattern seeks to decouple the content of the page from its layout, allowing changes to be made to either the content
|
||||
or layout of the page without impacting the other. This pattern also allows content to be easily reused across different views easily.
|
||||
|
||||
## Explanation
|
||||
Real World Example
|
||||
> A news site wants to display the current date and news to different users
|
||||
> based on that user's preferences. The news site will substitute in different news feed
|
||||
> components depending on the user's interest, defaulting to local news.
|
||||
|
||||
In Plain Words
|
||||
> Composite View Pattern is having a main view being composed of smaller subviews.
|
||||
> The layout of this composite view is based on a template. A View-manager then decides which
|
||||
> subviews to include in this template.
|
||||
|
||||
Wikipedia Says
|
||||
> Composite views that are composed of multiple atomic subviews. Each component of
|
||||
> the template may be included dynamically into the whole and the layout of the page may be managed independently of the content.
|
||||
> This solution provides for the creation of a composite view based on the inclusion and substitution of
|
||||
> modular dynamic and static template fragments.
|
||||
> It promotes the reuse of atomic portions of the view by encouraging modular design.
|
||||
|
||||
**Programmatic Example**
|
||||
|
||||
Since this is a web development pattern, a server is required to demonstrate it.
|
||||
This example uses Tomcat 10.0.13 to run the servlet, and this programmatic example will only work with Tomcat 10+.
|
||||
|
||||
Firstly there is `AppServlet` which is an `HttpServlet` that runs on Tomcat 10+.
|
||||
```java
|
||||
public class AppServlet extends HttpServlet {
|
||||
private String msgPartOne = "<h1>This Server Doesn't Support";
|
||||
private String msgPartTwo = "Requests</h1>\n"
|
||||
+ "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
|
||||
+ "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
|
||||
|
||||
private String destination = "newsDisplay.jsp";
|
||||
|
||||
public AppServlet() {
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doGet(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
RequestDispatcher requestDispatcher = req.getRequestDispatcher(destination);
|
||||
ClientPropertiesBean reqParams = new ClientPropertiesBean(req);
|
||||
req.setAttribute("properties", reqParams);
|
||||
requestDispatcher.forward(req, resp);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doPost(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
PrintWriter out = resp.getWriter();
|
||||
out.println(msgPartOne + " Post " + msgPartTwo);
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doDelete(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
PrintWriter out = resp.getWriter();
|
||||
out.println(msgPartOne + " Delete " + msgPartTwo);
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doPut(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
PrintWriter out = resp.getWriter();
|
||||
out.println(msgPartOne + " Put " + msgPartTwo);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
```
|
||||
This servlet is not part of the pattern, and simply forwards GET requests to the correct JSP.
|
||||
PUT, POST, and DELETE requests are not supported and will simply show an error message.
|
||||
|
||||
The view management in this example is done via a javabean class: `ClientPropertiesBean`, which stores user preferences.
|
||||
```java
|
||||
public class ClientPropertiesBean implements Serializable {
|
||||
|
||||
private static final String WORLD_PARAM = "world";
|
||||
private static final String SCIENCE_PARAM = "sci";
|
||||
private static final String SPORTS_PARAM = "sport";
|
||||
private static final String BUSINESS_PARAM = "bus";
|
||||
private static final String NAME_PARAM = "name";
|
||||
|
||||
private static final String DEFAULT_NAME = "DEFAULT_NAME";
|
||||
private boolean worldNewsInterest;
|
||||
private boolean sportsInterest;
|
||||
private boolean businessInterest;
|
||||
private boolean scienceNewsInterest;
|
||||
private String name;
|
||||
|
||||
public ClientPropertiesBean() {
|
||||
worldNewsInterest = true;
|
||||
sportsInterest = true;
|
||||
businessInterest = true;
|
||||
scienceNewsInterest = true;
|
||||
name = DEFAULT_NAME;
|
||||
|
||||
}
|
||||
|
||||
public ClientPropertiesBean(HttpServletRequest req) {
|
||||
worldNewsInterest = Boolean.parseBoolean(req.getParameter(WORLD_PARAM));
|
||||
sportsInterest = Boolean.parseBoolean(req.getParameter(SPORTS_PARAM));
|
||||
businessInterest = Boolean.parseBoolean(req.getParameter(BUSINESS_PARAM));
|
||||
scienceNewsInterest = Boolean.parseBoolean(req.getParameter(SCIENCE_PARAM));
|
||||
String tempName = req.getParameter(NAME_PARAM);
|
||||
if (tempName == null || tempName == "") {
|
||||
tempName = DEFAULT_NAME;
|
||||
}
|
||||
name = tempName;
|
||||
}
|
||||
// getters and setters generated by Lombok
|
||||
}
|
||||
```
|
||||
This javabean has a default constructor, and another that takes an `HttpServletRequest`.
|
||||
This second constructor takes the request object, parses out the request parameters which contain the
|
||||
user preferences for different types of news.
|
||||
|
||||
The template for the news page is in `newsDisplay.jsp`
|
||||
```html
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h1 { text-align: center;}
|
||||
h2 { text-align: center;}
|
||||
h3 { text-align: center;}
|
||||
.centerTable {
|
||||
margin-left: auto;
|
||||
margin-right: auto;
|
||||
}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<%ClientPropertiesBean propertiesBean = (ClientPropertiesBean) request.getAttribute("properties");%>
|
||||
<h1>Welcome <%= propertiesBean.getName()%></h1>
|
||||
<jsp:include page="header.jsp"></jsp:include>
|
||||
<table class="centerTable">
|
||||
|
||||
<tr>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isWorldNewsInterest()) { %>
|
||||
<td><%@include file="worldNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<% if(propertiesBean.isBusinessInterest()) { %>
|
||||
<td><%@include file="businessNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isSportsInterest()) { %>
|
||||
<td><%@include file="sportsNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
</tr>
|
||||
<tr>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isScienceNewsInterest()) { %>
|
||||
<td><%@include file="scienceNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
||||
```
|
||||
This JSP page is the template. It declares a table with three rows, with one component in the first row,
|
||||
two components in the second row, and one component in the third row.
|
||||
|
||||
The scriplets in the file are part of the
|
||||
view management strategy that include different atomic subviews based on the user preferences in the Javabean.
|
||||
|
||||
Here are two examples of the mock atomic subviews used in the composite:
|
||||
`businessNews.jsp`
|
||||
```html
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h2 { text-align: center;}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<h2>
|
||||
Generic Business News
|
||||
</h2>
|
||||
<table style="margin-right: auto; margin-left: auto">
|
||||
<tr>
|
||||
<td>Stock prices up across the world</td>
|
||||
<td>New tech companies to invest in</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Industry leaders unveil new project</td>
|
||||
<td>Price fluctuations and what they mean</td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
||||
```
|
||||
`localNews.jsp`
|
||||
```html
|
||||
<html>
|
||||
<body>
|
||||
<div style="text-align: center">
|
||||
<h3>
|
||||
Generic Local News
|
||||
</h3>
|
||||
<ul style="list-style-type: none">
|
||||
<li>
|
||||
Mayoral elections coming up in 2 weeks
|
||||
</li>
|
||||
<li>
|
||||
New parking meter rates downtown coming tomorrow
|
||||
</li>
|
||||
<li>
|
||||
Park renovations to finish by the next year
|
||||
</li>
|
||||
<li>
|
||||
Annual marathon sign ups available online
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
```
|
||||
The results are as such:
|
||||
|
||||
1) The user has put their name as `Tammy` in the request parameters and no preferences:
|
||||

|
||||
2) The user has put their name as `Johnny` in the request parameters and has a preference for world, business, and science news:
|
||||

|
||||
|
||||
The different subviews such as `worldNews.jsp`, `businessNews.jsp`, etc. are included conditionally
|
||||
based on the request parameters.
|
||||
|
||||
**How To Use**
|
||||
|
||||
To try this example, make sure you have Tomcat 10+ installed.
|
||||
Set up your IDE to build a WAR file from the module and deploy that file to the server
|
||||
|
||||
IntelliJ:
|
||||
|
||||
Under `Run` and `edit configurations` Make sure Tomcat server is one of the run configurations.
|
||||
Go to the deployment tab, and make sure there is one artifact being built called `composite-view:war exploded`.
|
||||
If not present, add one.
|
||||
|
||||
Ensure that the artifact is being built from the content of the `web` directory and the compilation results of the module.
|
||||
Point the output of the artifact to a convenient place. Run the configuration and view the landing page,
|
||||
follow instructions on that page to continue.
|
||||
|
||||
## Class diagram
|
||||
|
||||

|
||||
|
||||
The class diagram here displays the Javabean which is the view manager.
|
||||
The views are JSP's held inside the web directory.
|
||||
|
||||
## Applicability
|
||||
|
||||
This pattern is applicable to most websites that require content to be displayed dynamically/conditionally.
|
||||
If there are components that need to be re-used for multiple views, or if the project requires reusing a template,
|
||||
or if it needs to include content depending on certain conditions, then this pattern is a good choice.
|
||||
|
||||
## Known uses
|
||||
|
||||
Most modern websites use composite views in some shape or form, as they have templates for views and small atomic components
|
||||
that are included in the page dynamically. Most modern Javascript libraries, like React, support this design pattern
|
||||
with components.
|
||||
|
||||
## Consequences
|
||||
**Pros**
|
||||
* Easy to re-use components
|
||||
* Change layout/content without affecting the other
|
||||
* Reduce code duplication
|
||||
* Code is more maintainable and modular
|
||||
|
||||
**Cons**
|
||||
* Overhead cost at runtime
|
||||
* Slower response compared to directly embedding elements
|
||||
* Increases potential for display errors
|
||||
|
||||
## Related patterns
|
||||
* [Composite (GoF)](https://java-design-patterns.com/patterns/composite/)
|
||||
* [View Helper](https://www.oracle.com/java/technologies/viewhelper.html)
|
||||
|
||||
## Credits
|
||||
* [Core J2EE Patterns - Composite View](https://www.oracle.com/java/technologies/composite-view.html)
|
||||
* [Composite View Design Pattern – Core J2EE Patterns](https://www.dineshonjava.com/composite-view-design-pattern/)
|
||||
|
@ -1,29 +0,0 @@
|
||||
@startuml
|
||||
package com.iluwatar.compositeview {
|
||||
class ClientPropertiesBean {
|
||||
- BUSINESS_PARAM : String {static}
|
||||
- DEFAULT_NAME : String {static}
|
||||
- NAME_PARAM : String {static}
|
||||
- SCIENCE_PARAM : String {static}
|
||||
- SPORTS_PARAM : String {static}
|
||||
- WORLD_PARAM : String {static}
|
||||
- businessInterest : boolean
|
||||
- name : String
|
||||
- scienceNewsInterest : boolean
|
||||
- sportsInterest : boolean
|
||||
- worldNewsInterest : boolean
|
||||
+ ClientPropertiesBean()
|
||||
+ ClientPropertiesBean(req : HttpServletRequest)
|
||||
+ getName() : String
|
||||
+ isBusinessInterest() : boolean
|
||||
+ isScienceNewsInterest() : boolean
|
||||
+ isSportsInterest() : boolean
|
||||
+ isWorldNewsInterest() : boolean
|
||||
+ setBusinessInterest(businessInterest : boolean)
|
||||
+ setName(name : String)
|
||||
+ setScienceNewsInterest(scienceNewsInterest : boolean)
|
||||
+ setSportsInterest(sportsInterest : boolean)
|
||||
+ setWorldNewsInterest(worldNewsInterest : boolean)
|
||||
}
|
||||
}
|
||||
@enduml
|
Binary file not shown.
Before Width: | Height: | Size: 19 KiB |
Binary file not shown.
Before Width: | Height: | Size: 71 KiB |
Binary file not shown.
Before Width: | Height: | Size: 77 KiB |
@ -1,80 +0,0 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<!--
|
||||
|
||||
The MIT License
|
||||
Copyright © 2014-2021 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>1.26.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>composite-view</artifactId>
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.junit.jupiter</groupId>
|
||||
<artifactId>junit-jupiter-engine</artifactId>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>junit</groupId>
|
||||
<artifactId>junit</artifactId>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>jakarta.servlet</groupId>
|
||||
<artifactId>jakarta.servlet-api</artifactId>
|
||||
<version>5.0.0</version>
|
||||
<scope>compile</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.mockito</groupId>
|
||||
<artifactId>mockito-core</artifactId>
|
||||
<version>4.1.0</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-assembly-plugin</artifactId>
|
||||
<executions>
|
||||
<execution>
|
||||
<configuration>
|
||||
<archive>
|
||||
<manifest>
|
||||
<mainClass>com.iluwatar.compositeview.App</mainClass>
|
||||
</manifest>
|
||||
</archive>
|
||||
</configuration>
|
||||
</execution>
|
||||
</executions>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
</project>
|
@ -1,64 +0,0 @@
|
||||
package com.iluwatar.compositeview;
|
||||
|
||||
import jakarta.servlet.RequestDispatcher;
|
||||
import jakarta.servlet.ServletException;
|
||||
import jakarta.servlet.http.HttpServlet;
|
||||
import jakarta.servlet.http.HttpServletRequest;
|
||||
import jakarta.servlet.http.HttpServletResponse;
|
||||
import java.io.IOException;
|
||||
import java.io.PrintWriter;
|
||||
|
||||
/**
|
||||
* A servlet object that extends HttpServlet.
|
||||
* Runs on Tomcat 10 and handles Http requests
|
||||
*/
|
||||
|
||||
public final class AppServlet extends HttpServlet {
|
||||
private String msgPartOne = "<h1>This Server Doesn't Support";
|
||||
private String msgPartTwo = "Requests</h1>\n"
|
||||
+ "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
|
||||
+ "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
|
||||
|
||||
private String destination = "newsDisplay.jsp";
|
||||
|
||||
public AppServlet() {
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doGet(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
RequestDispatcher requestDispatcher = req.getRequestDispatcher(destination);
|
||||
ClientPropertiesBean reqParams = new ClientPropertiesBean(req);
|
||||
req.setAttribute("properties", reqParams);
|
||||
requestDispatcher.forward(req, resp);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doPost(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
try (PrintWriter out = resp.getWriter()) {
|
||||
out.println(msgPartOne + " Post " + msgPartTwo);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doDelete(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
try (PrintWriter out = resp.getWriter()) {
|
||||
out.println(msgPartOne + " Delete " + msgPartTwo);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void doPut(HttpServletRequest req, HttpServletResponse resp)
|
||||
throws ServletException, IOException {
|
||||
resp.setContentType("text/html");
|
||||
try (PrintWriter out = resp.getWriter()) {
|
||||
out.println(msgPartOne + " Put " + msgPartTwo);
|
||||
}
|
||||
}
|
||||
}
|
@ -1,53 +0,0 @@
|
||||
package com.iluwatar.compositeview;
|
||||
|
||||
import jakarta.servlet.http.HttpServletRequest;
|
||||
import java.io.Serializable;
|
||||
import lombok.Getter;
|
||||
import lombok.NoArgsConstructor;
|
||||
import lombok.Setter;
|
||||
|
||||
|
||||
/**
|
||||
* A Java beans class that parses a http request and stores parameters.
|
||||
* Java beans used in JSP's to dynamically include elements in view.
|
||||
* DEFAULT_NAME = a constant, default name to be used for the default constructor
|
||||
* worldNewsInterest = whether current request has world news interest
|
||||
* sportsInterest = whether current request has a sportsInterest
|
||||
* businessInterest = whether current request has a businessInterest
|
||||
* scienceNewsInterest = whether current request has a scienceNewsInterest
|
||||
*/
|
||||
@Getter
|
||||
@Setter
|
||||
@NoArgsConstructor
|
||||
public class ClientPropertiesBean implements Serializable {
|
||||
|
||||
private static final String WORLD_PARAM = "world";
|
||||
private static final String SCIENCE_PARAM = "sci";
|
||||
private static final String SPORTS_PARAM = "sport";
|
||||
private static final String BUSINESS_PARAM = "bus";
|
||||
private static final String NAME_PARAM = "name";
|
||||
|
||||
private static final String DEFAULT_NAME = "DEFAULT_NAME";
|
||||
private boolean worldNewsInterest = true;
|
||||
private boolean sportsInterest = true;
|
||||
private boolean businessInterest = true;
|
||||
private boolean scienceNewsInterest = true;
|
||||
private String name = DEFAULT_NAME;
|
||||
|
||||
/**
|
||||
* Constructor that parses an HttpServletRequest and stores all the request parameters.
|
||||
*
|
||||
* @param req the HttpServletRequest object that is passed in
|
||||
*/
|
||||
public ClientPropertiesBean(HttpServletRequest req) {
|
||||
worldNewsInterest = Boolean.parseBoolean(req.getParameter(WORLD_PARAM));
|
||||
sportsInterest = Boolean.parseBoolean(req.getParameter(SPORTS_PARAM));
|
||||
businessInterest = Boolean.parseBoolean(req.getParameter(BUSINESS_PARAM));
|
||||
scienceNewsInterest = Boolean.parseBoolean(req.getParameter(SCIENCE_PARAM));
|
||||
String tempName = req.getParameter(NAME_PARAM);
|
||||
if (tempName == null || tempName.equals("")) {
|
||||
tempName = DEFAULT_NAME;
|
||||
}
|
||||
name = tempName;
|
||||
}
|
||||
}
|
@ -1,83 +0,0 @@
|
||||
package com.iluwatar.compositeview;
|
||||
|
||||
import jakarta.servlet.RequestDispatcher;
|
||||
import jakarta.servlet.http.HttpServletRequest;
|
||||
import jakarta.servlet.http.HttpServletResponse;
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.mockito.Mockito;
|
||||
|
||||
import java.io.PrintWriter;
|
||||
import java.io.StringWriter;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
/* Written with reference from https://stackoverflow.com/questions/5434419/how-to-test-my-servlet-using-junit
|
||||
and https://stackoverflow.com/questions/50211433/servlets-unit-testing
|
||||
*/
|
||||
|
||||
public class AppServletTest extends Mockito{
|
||||
private String msgPartOne = "<h1>This Server Doesn't Support";
|
||||
private String msgPartTwo = "Requests</h1>\n"
|
||||
+ "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
|
||||
+ "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
|
||||
private String destination = "newsDisplay.jsp";
|
||||
|
||||
@Test
|
||||
public void testDoGet() throws Exception {
|
||||
HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
|
||||
HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
|
||||
RequestDispatcher mockDispatcher = Mockito.mock(RequestDispatcher.class);
|
||||
StringWriter stringWriter = new StringWriter();
|
||||
PrintWriter printWriter = new PrintWriter(stringWriter);
|
||||
when(mockResp.getWriter()).thenReturn(printWriter);
|
||||
when(mockReq.getRequestDispatcher(destination)).thenReturn(mockDispatcher);
|
||||
AppServlet curServlet = new AppServlet();
|
||||
curServlet.doGet(mockReq, mockResp);
|
||||
verify(mockReq, times(1)).getRequestDispatcher(destination);
|
||||
verify(mockDispatcher).forward(mockReq, mockResp);
|
||||
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDoPost() throws Exception {
|
||||
HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
|
||||
HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
|
||||
StringWriter stringWriter = new StringWriter();
|
||||
PrintWriter printWriter = new PrintWriter(stringWriter);
|
||||
when(mockResp.getWriter()).thenReturn(printWriter);
|
||||
|
||||
AppServlet curServlet = new AppServlet();
|
||||
curServlet.doPost(mockReq, mockResp);
|
||||
printWriter.flush();
|
||||
assertTrue(stringWriter.toString().contains(msgPartOne + " Post " + msgPartTwo));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDoPut() throws Exception {
|
||||
HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
|
||||
HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
|
||||
StringWriter stringWriter = new StringWriter();
|
||||
PrintWriter printWriter = new PrintWriter(stringWriter);
|
||||
when(mockResp.getWriter()).thenReturn(printWriter);
|
||||
|
||||
AppServlet curServlet = new AppServlet();
|
||||
curServlet.doPut(mockReq, mockResp);
|
||||
printWriter.flush();
|
||||
assertTrue(stringWriter.toString().contains(msgPartOne + " Put " + msgPartTwo));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDoDelete() throws Exception {
|
||||
HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
|
||||
HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
|
||||
StringWriter stringWriter = new StringWriter();
|
||||
PrintWriter printWriter = new PrintWriter(stringWriter);
|
||||
when(mockResp.getWriter()).thenReturn(printWriter);
|
||||
|
||||
AppServlet curServlet = new AppServlet();
|
||||
curServlet.doDelete(mockReq, mockResp);
|
||||
printWriter.flush();
|
||||
assertTrue(stringWriter.toString().contains(msgPartOne + " Delete " + msgPartTwo));
|
||||
}
|
||||
}
|
@ -1,71 +0,0 @@
|
||||
package com.iluwatar.compositeview;
|
||||
|
||||
import jakarta.servlet.http.HttpServletRequest;
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.mockito.Mockito;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class JavaBeansTest {
|
||||
@Test
|
||||
public void testDefaultConstructor() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertEquals("DEFAULT_NAME", newBean.getName());
|
||||
assertTrue(newBean.isBusinessInterest());
|
||||
assertTrue(newBean.isScienceNewsInterest());
|
||||
assertTrue(newBean.isSportsInterest());
|
||||
assertTrue(newBean.isWorldNewsInterest());
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testNameGetterSetter() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertEquals("DEFAULT_NAME", newBean.getName());
|
||||
newBean.setName("TEST_NAME_ONE");
|
||||
assertEquals("TEST_NAME_ONE", newBean.getName());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testBusinessSetterGetter() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertTrue(newBean.isBusinessInterest());
|
||||
newBean.setBusinessInterest(false);
|
||||
assertFalse(newBean.isBusinessInterest());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testScienceSetterGetter() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertTrue(newBean.isScienceNewsInterest());
|
||||
newBean.setScienceNewsInterest(false);
|
||||
assertFalse(newBean.isScienceNewsInterest());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testSportsSetterGetter() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertTrue(newBean.isSportsInterest());
|
||||
newBean.setSportsInterest(false);
|
||||
assertFalse(newBean.isSportsInterest());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testWorldSetterGetter() {
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean();
|
||||
assertTrue(newBean.isWorldNewsInterest());
|
||||
newBean.setWorldNewsInterest(false);
|
||||
assertFalse(newBean.isWorldNewsInterest());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testRequestConstructor(){
|
||||
HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
|
||||
ClientPropertiesBean newBean = new ClientPropertiesBean((mockReq));
|
||||
assertEquals("DEFAULT_NAME", newBean.getName());
|
||||
assertFalse(newBean.isWorldNewsInterest());
|
||||
assertFalse(newBean.isBusinessInterest());
|
||||
assertFalse(newBean.isScienceNewsInterest());
|
||||
assertFalse(newBean.isSportsInterest());
|
||||
}
|
||||
}
|
@ -1,14 +0,0 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
|
||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
|
||||
version="4.0">
|
||||
<servlet>
|
||||
<servlet-name>appServlet</servlet-name>
|
||||
<servlet-class>com.iluwatar.compositeview.AppServlet</servlet-class>
|
||||
</servlet>
|
||||
<servlet-mapping>
|
||||
<servlet-name>appServlet</servlet-name>
|
||||
<url-pattern>/news</url-pattern>
|
||||
</servlet-mapping>
|
||||
</web-app>
|
@ -1,33 +0,0 @@
|
||||
<%--
|
||||
Created by IntelliJ IDEA.
|
||||
User: Kevin
|
||||
Date: 11/29/2021
|
||||
Time: 2:51 PM
|
||||
To change this template use File | Settings | File Templates.
|
||||
--%>
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h2 { text-align: center;}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<h2>
|
||||
Generic Business News
|
||||
</h2>
|
||||
<table style="margin-right: auto; margin-left: auto">
|
||||
<tr>
|
||||
<td>Stock prices up across the world</td>
|
||||
<td>New tech companies to invest in</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Industry leaders unveil new project</td>
|
||||
<td>Price fluctuations and what they mean</td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
@ -1,23 +0,0 @@
|
||||
<%--
|
||||
Created by IntelliJ IDEA.
|
||||
User: Kevin
|
||||
Date: 11/29/2021
|
||||
Time: 1:28 PM
|
||||
To change this template use File | Settings | File Templates.
|
||||
--%>
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<%@ page import="java.util.Date"%>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h1 { text-align: center;}
|
||||
h2 { text-align: center;}
|
||||
h3 { text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<% String todayDateStr = (new Date().toString()); %>
|
||||
<h1>Today's Personalized Frontpage</h1>
|
||||
<h2><%=todayDateStr%></h2>
|
||||
</body>
|
||||
</html>
|
@ -1,20 +0,0 @@
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h1 { text-align: center;}
|
||||
h2 { text-align: center;}
|
||||
h3 { text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<h1>Welcome To The Composite Patterns Mock News Site</h1>
|
||||
<h2>Send a GET request to the "/news" path to see the composite view with mock news</h2>
|
||||
<h2>Use the following parameters:</h2>
|
||||
<h3>name: string name to be dynamically displayed</h3>
|
||||
<h3>bus: boolean for whether you want to see the mock business news</h3>
|
||||
<h3>world: boolean for whether you want to see the mock world news</h3>
|
||||
<h3>sci: boolean for whether you want to see the mock world news</h3>
|
||||
<h3>sport: boolean for whether you want to see the mock world news</h3>
|
||||
</body>
|
||||
</html>
|
@ -1,25 +0,0 @@
|
||||
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<body>
|
||||
<div style="text-align: center">
|
||||
<h3>
|
||||
Generic Local News
|
||||
</h3>
|
||||
<ul style="list-style-type: none">
|
||||
<li>
|
||||
Mayoral elections coming up in 2 weeks
|
||||
</li>
|
||||
<li>
|
||||
New parking meter rates downtown coming tomorrow
|
||||
</li>
|
||||
<li>
|
||||
Park renovations to finish by the next year
|
||||
</li>
|
||||
<li>
|
||||
Annual marathon sign ups available online
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
@ -1,57 +0,0 @@
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<%@ page import="com.iluwatar.compositeview.ClientPropertiesBean"%>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h1 { text-align: center;}
|
||||
h2 { text-align: center;}
|
||||
h3 { text-align: center;}
|
||||
.centerTable {
|
||||
margin-left: auto;
|
||||
margin-right: auto;
|
||||
}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<%ClientPropertiesBean propertiesBean = (ClientPropertiesBean) request.getAttribute("properties");%>
|
||||
<h1>Welcome <%= propertiesBean.getName()%></h1>
|
||||
<jsp:include page="header.jsp"></jsp:include>
|
||||
<table class="centerTable">
|
||||
|
||||
<tr>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isWorldNewsInterest()) { %>
|
||||
<td><%@include file="worldNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<% if(propertiesBean.isBusinessInterest()) { %>
|
||||
<td><%@include file="businessNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isSportsInterest()) { %>
|
||||
<td><%@include file="sportsNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
</tr>
|
||||
<tr>
|
||||
<td></td>
|
||||
<% if(propertiesBean.isScienceNewsInterest()) { %>
|
||||
<td><%@include file="scienceNews.jsp"%></td>
|
||||
<% } else { %>
|
||||
<td><%@include file="localNews.jsp"%></td>
|
||||
<% } %>
|
||||
<td></td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
@ -1,34 +0,0 @@
|
||||
<%--
|
||||
Created by IntelliJ IDEA.
|
||||
User: Kevin
|
||||
Date: 11/29/2021
|
||||
Time: 4:18 PM
|
||||
To change this template use File | Settings | File Templates.
|
||||
--%>
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<body>
|
||||
<div style="text-align: center">
|
||||
<h3>
|
||||
Generic Science News
|
||||
</h3>
|
||||
<ul>
|
||||
<li>
|
||||
New model of gravity proposed for dark matter
|
||||
</li>
|
||||
<li>
|
||||
Genetic modifying technique proved on bacteria
|
||||
</li>
|
||||
<li>
|
||||
Neurology study maps brain with new precision
|
||||
</li>
|
||||
<li>
|
||||
Survey of rainforest discovers 15 new species
|
||||
</li>
|
||||
<li>
|
||||
New signalling pathway for immune system discovered
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
@ -1,32 +0,0 @@
|
||||
<%--
|
||||
Created by IntelliJ IDEA.
|
||||
User: Kevin
|
||||
Date: 11/29/2021
|
||||
Time: 3:53 PM
|
||||
To change this template use File | Settings | File Templates.
|
||||
--%>
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h2 { text-align: center;}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<h2>
|
||||
Generic Sports News
|
||||
</h2>
|
||||
<div style="margin-left: auto; margin-right: auto; padding: 20px">
|
||||
International football match delayed due to weather, will be held next week
|
||||
</div>
|
||||
<div style="margin-left: auto; margin-right: auto; padding: 20px">
|
||||
New rising stars in winter sports, ten new athletes that will shake up the scene
|
||||
</div>
|
||||
<div style="margin-left: auto; margin-right: auto; padding: 20px">
|
||||
Biggest upset in basketball history, upstart team sweeps competition
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
@ -1,34 +0,0 @@
|
||||
<%--
|
||||
Created by IntelliJ IDEA.
|
||||
User: Kevin
|
||||
Date: 11/29/2021
|
||||
Time: 2:51 PM
|
||||
To change this template use File | Settings | File Templates.
|
||||
--%>
|
||||
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
|
||||
<html>
|
||||
<head>
|
||||
<style>
|
||||
h2 { text-align: center;}
|
||||
table {border: 1px solid black;}
|
||||
tr {text-align: center;}
|
||||
td {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<h2>
|
||||
Generic World News
|
||||
</h2>
|
||||
<table style="margin-right: auto; margin-left: auto">
|
||||
<tr>
|
||||
<td>New trade talks happening at UN on Thursday</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>European Union to announce new resolution next week</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>UN delivers report on world economic status</td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
@ -15,18 +15,18 @@ Registry
|
||||
|
||||
## Intent
|
||||
|
||||
Ensure a class only has a limited number of instances and provide a global point of access to them.
|
||||
Ensure a class only has limited number of instances and provide a global point of access to them.
|
||||
|
||||
## Explanation
|
||||
|
||||
Real-world example
|
||||
Real world example
|
||||
|
||||
> The Nazgûl, also called ringwraiths or the Nine Riders, are Sauron's most terrible servants. By
|
||||
> definition, there's always nine of them.
|
||||
> definition there's always nine of them.
|
||||
|
||||
In plain words
|
||||
|
||||
> Multiton pattern ensures there are a predefined amount of instances available globally.
|
||||
> Multiton pattern ensures there's predefined amount of instances available globally.
|
||||
|
||||
Wikipedia says
|
||||
|
||||
@ -81,54 +81,29 @@ public final class Nazgul {
|
||||
And here's how we access the `Nazgul` instances.
|
||||
|
||||
```java
|
||||
// eagerly initialized multiton
|
||||
LOGGER.info("Printing out eagerly initialized multiton contents");
|
||||
LOGGER.info("KHAMUL={}", Nazgul.getInstance(NazgulName.KHAMUL));
|
||||
LOGGER.info("MURAZOR={}", Nazgul.getInstance(NazgulName.MURAZOR));
|
||||
LOGGER.info("DWAR={}", Nazgul.getInstance(NazgulName.DWAR));
|
||||
LOGGER.info("JI_INDUR={}", Nazgul.getInstance(NazgulName.JI_INDUR));
|
||||
LOGGER.info("AKHORAHIL={}", Nazgul.getInstance(NazgulName.AKHORAHIL));
|
||||
LOGGER.info("HOARMURATH={}", Nazgul.getInstance(NazgulName.HOARMURATH));
|
||||
LOGGER.info("ADUNAPHEL={}", Nazgul.getInstance(NazgulName.ADUNAPHEL));
|
||||
LOGGER.info("REN={}", Nazgul.getInstance(NazgulName.REN));
|
||||
LOGGER.info("UVATHA={}", Nazgul.getInstance(NazgulName.UVATHA));
|
||||
|
||||
// enum multiton
|
||||
LOGGER.info("Printing out enum-based multiton contents");
|
||||
LOGGER.info("KHAMUL={}", NazgulEnum.KHAMUL);
|
||||
LOGGER.info("MURAZOR={}", NazgulEnum.MURAZOR);
|
||||
LOGGER.info("DWAR={}", NazgulEnum.DWAR);
|
||||
LOGGER.info("JI_INDUR={}", NazgulEnum.JI_INDUR);
|
||||
LOGGER.info("AKHORAHIL={}", NazgulEnum.AKHORAHIL);
|
||||
LOGGER.info("HOARMURATH={}", NazgulEnum.HOARMURATH);
|
||||
LOGGER.info("ADUNAPHEL={}", NazgulEnum.ADUNAPHEL);
|
||||
LOGGER.info("REN={}", NazgulEnum.REN);
|
||||
LOGGER.info("UVATHA={}", NazgulEnum.UVATHA);
|
||||
LOGGER.info("KHAMUL={}", Nazgul.getInstance(NazgulName.KHAMUL));
|
||||
LOGGER.info("MURAZOR={}", Nazgul.getInstance(NazgulName.MURAZOR));
|
||||
LOGGER.info("DWAR={}", Nazgul.getInstance(NazgulName.DWAR));
|
||||
LOGGER.info("JI_INDUR={}", Nazgul.getInstance(NazgulName.JI_INDUR));
|
||||
LOGGER.info("AKHORAHIL={}", Nazgul.getInstance(NazgulName.AKHORAHIL));
|
||||
LOGGER.info("HOARMURATH={}", Nazgul.getInstance(NazgulName.HOARMURATH));
|
||||
LOGGER.info("ADUNAPHEL={}", Nazgul.getInstance(NazgulName.ADUNAPHEL));
|
||||
LOGGER.info("REN={}", Nazgul.getInstance(NazgulName.REN));
|
||||
LOGGER.info("UVATHA={}", Nazgul.getInstance(NazgulName.UVATHA));
|
||||
```
|
||||
|
||||
Program output:
|
||||
|
||||
```
|
||||
20:35:07.413 [main] INFO com.iluwatar.multiton.App - Printing out eagerly initialized multiton contents
|
||||
20:35:07.417 [main] INFO com.iluwatar.multiton.App - KHAMUL=com.iluwatar.multiton.Nazgul@48cf768c
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - MURAZOR=com.iluwatar.multiton.Nazgul@7960847b
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - DWAR=com.iluwatar.multiton.Nazgul@6a6824be
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - JI_INDUR=com.iluwatar.multiton.Nazgul@5c8da962
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - AKHORAHIL=com.iluwatar.multiton.Nazgul@512ddf17
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - HOARMURATH=com.iluwatar.multiton.Nazgul@2c13da15
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - ADUNAPHEL=com.iluwatar.multiton.Nazgul@77556fd
|
||||
20:35:07.419 [main] INFO com.iluwatar.multiton.App - REN=com.iluwatar.multiton.Nazgul@368239c8
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - UVATHA=com.iluwatar.multiton.Nazgul@9e89d68
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - Printing out enum-based multiton contents
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - KHAMUL=KHAMUL
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - MURAZOR=MURAZOR
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - DWAR=DWAR
|
||||
20:35:07.420 [main] INFO com.iluwatar.multiton.App - JI_INDUR=JI_INDUR
|
||||
20:35:07.421 [main] INFO com.iluwatar.multiton.App - AKHORAHIL=AKHORAHIL
|
||||
20:35:07.421 [main] INFO com.iluwatar.multiton.App - HOARMURATH=HOARMURATH
|
||||
20:35:07.421 [main] INFO com.iluwatar.multiton.App - ADUNAPHEL=ADUNAPHEL
|
||||
20:35:07.421 [main] INFO com.iluwatar.multiton.App - REN=REN
|
||||
20:35:07.421 [main] INFO com.iluwatar.multiton.App - UVATHA=UVATHA
|
||||
KHAMUL=com.iluwatar.multiton.Nazgul@2b214b94
|
||||
MURAZOR=com.iluwatar.multiton.Nazgul@17814b1c
|
||||
DWAR=com.iluwatar.multiton.Nazgul@7ac9af2a
|
||||
JI_INDUR=com.iluwatar.multiton.Nazgul@7bb004b8
|
||||
AKHORAHIL=com.iluwatar.multiton.Nazgul@78e89bfe
|
||||
HOARMURATH=com.iluwatar.multiton.Nazgul@652ce654
|
||||
ADUNAPHEL=com.iluwatar.multiton.Nazgul@522ba524
|
||||
REN=com.iluwatar.multiton.Nazgul@29c5ee1d
|
||||
UVATHA=com.iluwatar.multiton.Nazgul@15cea7b0
|
||||
```
|
||||
|
||||
## Class diagram
|
||||
@ -139,5 +114,5 @@ Program output:
|
||||
|
||||
Use the Multiton pattern when
|
||||
|
||||
* There must be a specific number of instances of a class, and they must be accessible to clients from
|
||||
* There must be specific number of instances of a class, and they must be accessible to clients from
|
||||
a well-known access point.
|
||||
|
@ -26,13 +26,13 @@ package com.iluwatar.multiton;
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
/**
|
||||
* Whereas Singleton design pattern introduces single globally accessible object, the Multiton
|
||||
* Whereas Singleton design pattern introduces single globally accessible object the Multiton
|
||||
* pattern defines many globally accessible objects. The client asks for the correct instance from
|
||||
* the Multiton by passing an enumeration as a parameter.
|
||||
* the Multiton by passing an enumeration as parameter.
|
||||
*
|
||||
* <p>There is more than one way to implement the multiton design pattern. In the first example
|
||||
* {@link Nazgul} is the Multiton and we can ask single {@link Nazgul} from it using {@link
|
||||
* NazgulName}. The {@link Nazgul}s are statically initialized and stored in a concurrent hash map.
|
||||
* NazgulName}. The {@link Nazgul}s are statically initialized and stored in concurrent hash map.
|
||||
*
|
||||
* <p>In the enum implementation {@link NazgulEnum} is the multiton. It is static and mutable
|
||||
* because of the way java supports enums.
|
||||
@ -47,7 +47,6 @@ public class App {
|
||||
*/
|
||||
public static void main(String[] args) {
|
||||
// eagerly initialized multiton
|
||||
LOGGER.info("Printing out eagerly initialized multiton contents");
|
||||
LOGGER.info("KHAMUL={}", Nazgul.getInstance(NazgulName.KHAMUL));
|
||||
LOGGER.info("MURAZOR={}", Nazgul.getInstance(NazgulName.MURAZOR));
|
||||
LOGGER.info("DWAR={}", Nazgul.getInstance(NazgulName.DWAR));
|
||||
@ -59,7 +58,6 @@ public class App {
|
||||
LOGGER.info("UVATHA={}", Nazgul.getInstance(NazgulName.UVATHA));
|
||||
|
||||
// enum multiton
|
||||
LOGGER.info("Printing out enum-based multiton contents");
|
||||
LOGGER.info("KHAMUL={}", NazgulEnum.KHAMUL);
|
||||
LOGGER.info("MURAZOR={}", NazgulEnum.MURAZOR);
|
||||
LOGGER.info("DWAR={}", NazgulEnum.DWAR);
|
||||
|
@ -48,4 +48,5 @@ public class NazgulTest {
|
||||
assertEquals(name, nazgul.getName());
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
1
naked-objects/README
Normal file
1
naked-objects/README
Normal file
@ -0,0 +1 @@
|
||||
This is an Apache Isis application created with the SimpleApp archetype. The usage instructions can be found at http://isis.apache.org/guides/ug.html#_ug_getting-started_simpleapp-archetype
|
Loading…
x
Reference in New Issue
Block a user