latest/examples/cdi-produces-field.html - tomee-site-pub - Git at Google

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     <div id="main-block" class="container main-block">
         <div class="row title">
           <div class="col-md-12">
             <div class='page-header'>

               <h1>CDI Field Producer</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>This example shows the usage of the @Produces annotation. @Produces is a CDI mechanism which allows defining a source
  for injection. This example shows one of two ways of declaring a producer. Instead of a producer method (see CDI-produces-disposes example)
 a producer field can be used. A producer field can be used instead of a simple getter method. It could be used to
 inject resources, such as persistence contexts. One caveat to using producer fields over producer
  methods is that a @Disposes method cannot be used in conjunction with @Produces field.</p>
 </div>
 <div class="paragraph">
 <p>For the purposes of this example, the type is hard-coded to a specific value.
 A Logger implementation shall contain a list of LogHandlers. We shall have three implementations of the LogHandler interface.</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>A DatabaseHandler</p>
 </li>
 <li>
 <p>A FileHandler</p>
 </li>
 <li>
 <p>A ConsoleHandler</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p>The DatabaseHandler would seemingly write the logs to a database. The FileHandler would write the same logs to a file.
 The ConsoleHandler would just print the logs to a console (Standard out). This example is just an illustration of how
 the concepts within CDI work and is not intended to provide a logging framework design/implementation.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_consolehandler">ConsoleHandler</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 public class ConsoleHandler implements LogHandler {

     private String name;

     public ConsoleHandler(String name) {
         this.name = name;
     }

     @Override
     public String getName() {
         return name;
     }

     @Override
     public void writeLog(String s) {
         System.out.printf("##### Handler: %s, Writing to the console!\n", getName());
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_databasehandler">DatabaseHandler</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 public class DatabaseHandler implements LogHandler {

     private String name;

     public DatabaseHandler(String name) {
         this.name = name;
     }

     @Override
     public String getName() {
         return name;
     }

     @Override
     public void writeLog(String s) {
         System.out.printf("##### Handler: %s, Writing to the database!\n", getName());
         // Use connection to write log to database
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_filehandler">FileHandler</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 public class FileHandler implements LogHandler {

     private String name;

     public FileHandler(String name) {
         this.name = name;
     }

     @Override
     public String getName() {
         return name;
     }

     @Override
     public void writeLog(String s) {
         System.out.printf("##### Handler: %s, Writing to the file!\n", getName());
         // Write to log file
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_logfactory">LogFactory</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 import javax.enterprise.inject.Produces;

 public class LogFactory {

     private int type = 2;

     @Produces
     LogHandler handler;

     public LogFactory(){
     	handler = getLogHandler();
     }

     public LogHandler getLogHandler() {
         switch (type) {
             case 1:
                 return new FileHandler("@Produces created FileHandler!");
             case 2:
                 return new DatabaseHandler("@Produces created DatabaseHandler!");
             case 3:
             default:
                 return new ConsoleHandler("@Produces created ConsoleHandler!");
         }

     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_logger">Logger</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 public interface Logger {

     public void log(String s);

     public LogHandler getHandler();
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_loggerimpl">LoggerImpl</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 import javax.inject.Inject;
 import javax.inject.Named;

 @Named("logger")
 public class LoggerImpl implements Logger {

     @Inject
     private LogHandler handler;

     @Override
     public void log(String s) {
         getHandler().writeLog(s);
     }

     public LogHandler getHandler() {
         return handler;
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_loghandler">LogHandler</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 public interface LogHandler {

     public String getName();

     public void writeLog(String s);
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_beans_xml">beans.xml</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/beans_1_0.xsd"&gt;

 &lt;/beans&gt;</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_loggertest">LoggerTest</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

 import javax.ejb.embeddable.EJBContainer;
 import javax.inject.Inject;
 import javax.naming.Context;

 import static junit.framework.Assert.assertNotNull;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;

 public class LoggerTest {

     @Inject
     Logger logger;

     private Context ctxt;

     @Before
     public void setUp() {
         try {
             ctxt = EJBContainer.createEJBContainer().getContext();
             ctxt.bind("inject", this);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     @After
     public void cleanUp() {
         try {
             ctxt.unbind("inject");
             ctxt.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     @Test
     public void testLogHandler() {
         assertNotNull(logger);
         assertFalse("Handler should not be a ConsoleHandler", logger.getHandler() instanceof ConsoleHandler);
         assertFalse("Handler should not be a FileHandler", logger.getHandler() instanceof FileHandler);
         assertTrue("Handler should be a DatabaseHandler", logger.getHandler() instanceof DatabaseHandler);
         logger.log("##### Testing write\n");
         logger = null;
     }

 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <h1 id="_running" class="sect0">Running</h1>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-console" data-lang="console">-------------------------------------------------------
  T E S T S
 -------------------------------------------------------
 Running org.superbiz.cdi.produces.field.LoggerTest
 INFO - ********************************************************************************
 INFO - OpenEJB http://tomee.apache.org/
 INFO - Startup: Thu May 10 01:28:19 CDT 2012
 INFO - Copyright 1999-2012 (C) Apache OpenEJB Project, All Rights Reserved.
 INFO - Version: 7.0.0-SNAPSHOT
 INFO - Build date: 20120510
 INFO - Build time: 04:06
 INFO - ********************************************************************************
 INFO - openejb.home = /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
 INFO - openejb.base = /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
 INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@a81b1fb
 INFO - succeeded in installing singleton service
 INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
 INFO - Cannot find the configuration file [conf/openejb.xml].  Will attempt to create one for the beans deployed.
 INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
 INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
 INFO - Creating TransactionManager(id=Default Transaction Manager)
 INFO - Creating SecurityService(id=Default Security Service)
 INFO - Inspecting classpath for applications: 26 urls. Consider adjusting your exclude/include.  Current settings: openejb.deployments.classpath.exclude='', openejb.deployments.classpath.include='.*'
 INFO - Searched 26 classpath urls in 2015 milliseconds.  Average 77 milliseconds per url.
 INFO - Beginning load: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field/target/classes
 INFO - Configuring enterprise application: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
 INFO - Auto-deploying ejb cdi-produces-field.Comp: EjbDeployment(deployment-id=cdi-produces-field.Comp)
 INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
 INFO - Auto-creating a container for bean cdi-produces-field.Comp: Container(type=MANAGED, id=Default Managed Container)
 INFO - Creating Container(id=Default Managed Container)
 INFO - Using directory /tmp for stateful session passivation
 INFO - Enterprise application "/home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field" loaded.
 INFO - Assembling app: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
 INFO - ignoreXmlConfiguration == true
 INFO - ignoreXmlConfiguration == true
 INFO - existing thread singleton service in SystemInstance() org.apache.openejb.cdi.ThreadSingletonServiceImpl@a81b1fb
 INFO - OpenWebBeans Container is starting...
 INFO - Adding OpenWebBeansPlugin : [CdiPlugin]
 INFO - All injection points were validated successfully.
 INFO - OpenWebBeans Container has started, it took [69] ms.
 INFO - Deployed Application(path=/home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field)
 ##### Handler: @Produces created DatabaseHandler!, Writing to the database!
 INFO - Undeploying app: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
 Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.79 sec

 Results :

 Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
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	<div id="main-block" class="container main-block">
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	<div class='page-header'>

	<h1>CDI Field Producer</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>This example shows the usage of the @Produces annotation. @Produces is a CDI mechanism which allows defining a source
	for injection. This example shows one of two ways of declaring a producer. Instead of a producer method (see CDI-produces-disposes example)
	a producer field can be used. A producer field can be used instead of a simple getter method. It could be used to
	inject resources, such as persistence contexts. One caveat to using producer fields over producer
	methods is that a @Disposes method cannot be used in conjunction with @Produces field.</p>
	</div>
	<div class="paragraph">
	<p>For the purposes of this example, the type is hard-coded to a specific value.
	A Logger implementation shall contain a list of LogHandlers. We shall have three implementations of the LogHandler interface.</p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>A DatabaseHandler</p>
	</li>
	<li>
	<p>A FileHandler</p>
	</li>
	<li>
	<p>A ConsoleHandler</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p>The DatabaseHandler would seemingly write the logs to a database. The FileHandler would write the same logs to a file.
	The ConsoleHandler would just print the logs to a console (Standard out). This example is just an illustration of how
	the concepts within CDI work and is not intended to provide a logging framework design/implementation.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_consolehandler">ConsoleHandler</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	public class ConsoleHandler implements LogHandler {

	private String name;

	public ConsoleHandler(String name) {
	this.name = name;
	}

	@Override
	public String getName() {
	return name;
	}

	@Override
	public void writeLog(String s) {
	System.out.printf("##### Handler: %s, Writing to the console!\n", getName());
	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_databasehandler">DatabaseHandler</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	public class DatabaseHandler implements LogHandler {

	private String name;

	public DatabaseHandler(String name) {
	this.name = name;
	}

	@Override
	public String getName() {
	return name;
	}

	@Override
	public void writeLog(String s) {
	System.out.printf("##### Handler: %s, Writing to the database!\n", getName());
	// Use connection to write log to database
	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_filehandler">FileHandler</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	public class FileHandler implements LogHandler {

	private String name;

	public FileHandler(String name) {
	this.name = name;
	}

	@Override
	public String getName() {
	return name;
	}

	@Override
	public void writeLog(String s) {
	System.out.printf("##### Handler: %s, Writing to the file!\n", getName());
	// Write to log file
	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_logfactory">LogFactory</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	import javax.enterprise.inject.Produces;

	public class LogFactory {

	private int type = 2;

	@Produces
	LogHandler handler;

	public LogFactory(){
	handler = getLogHandler();
	}

	public LogHandler getLogHandler() {
	switch (type) {
	case 1:
	return new FileHandler("@Produces created FileHandler!");
	case 2:
	return new DatabaseHandler("@Produces created DatabaseHandler!");
	case 3:
	default:
	return new ConsoleHandler("@Produces created ConsoleHandler!");
	}

	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_logger">Logger</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	public interface Logger {

	public void log(String s);

	public LogHandler getHandler();
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_loggerimpl">LoggerImpl</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	import javax.inject.Inject;
	import javax.inject.Named;

	@Named("logger")
	public class LoggerImpl implements Logger {

	@Inject
	private LogHandler handler;

	@Override
	public void log(String s) {
	getHandler().writeLog(s);
	}

	public LogHandler getHandler() {
	return handler;
	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_loghandler">LogHandler</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	public interface LogHandler {

	public String getName();

	public void writeLog(String s);
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_beans_xml">beans.xml</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">

	</beans></code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_loggertest">LoggerTest</h2>
	<div class="sectionbody">
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.cdi.produces.field;

	import org.junit.After;
	import org.junit.Before;
	import org.junit.Test;

	import javax.ejb.embeddable.EJBContainer;
	import javax.inject.Inject;
	import javax.naming.Context;

	import static junit.framework.Assert.assertNotNull;
	import static org.junit.Assert.assertFalse;
	import static org.junit.Assert.assertTrue;

	public class LoggerTest {

	@Inject
	Logger logger;

	private Context ctxt;

	@Before
	public void setUp() {
	try {
	ctxt = EJBContainer.createEJBContainer().getContext();
	ctxt.bind("inject", this);
	} catch (Exception e) {
	e.printStackTrace();
	}
	}

	@After
	public void cleanUp() {
	try {
	ctxt.unbind("inject");
	ctxt.close();
	} catch (Exception e) {
	e.printStackTrace();
	}
	}

	@Test
	public void testLogHandler() {
	assertNotNull(logger);
	assertFalse("Handler should not be a ConsoleHandler", logger.getHandler() instanceof ConsoleHandler);
	assertFalse("Handler should not be a FileHandler", logger.getHandler() instanceof FileHandler);
	assertTrue("Handler should be a DatabaseHandler", logger.getHandler() instanceof DatabaseHandler);
	logger.log("##### Testing write\n");
	logger = null;
	}

	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<h1 id="_running" class="sect0">Running</h1>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-console" data-lang="console">-------------------------------------------------------
	T E S T S
	-------------------------------------------------------
	Running org.superbiz.cdi.produces.field.LoggerTest
	INFO - ********************************************************************************
	INFO - OpenEJB http://tomee.apache.org/
	INFO - Startup: Thu May 10 01:28:19 CDT 2012
	INFO - Copyright 1999-2012 (C) Apache OpenEJB Project, All Rights Reserved.
	INFO - Version: 7.0.0-SNAPSHOT
	INFO - Build date: 20120510
	INFO - Build time: 04:06
	INFO - ********************************************************************************
	INFO - openejb.home = /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
	INFO - openejb.base = /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
	INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@a81b1fb
	INFO - succeeded in installing singleton service
	INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
	INFO - Cannot find the configuration file [conf/openejb.xml]. Will attempt to create one for the beans deployed.
	INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
	INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
	INFO - Creating TransactionManager(id=Default Transaction Manager)
	INFO - Creating SecurityService(id=Default Security Service)
	INFO - Inspecting classpath for applications: 26 urls. Consider adjusting your exclude/include. Current settings: openejb.deployments.classpath.exclude='', openejb.deployments.classpath.include='.*'
	INFO - Searched 26 classpath urls in 2015 milliseconds. Average 77 milliseconds per url.
	INFO - Beginning load: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field/target/classes
	INFO - Configuring enterprise application: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
	INFO - Auto-deploying ejb cdi-produces-field.Comp: EjbDeployment(deployment-id=cdi-produces-field.Comp)
	INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
	INFO - Auto-creating a container for bean cdi-produces-field.Comp: Container(type=MANAGED, id=Default Managed Container)
	INFO - Creating Container(id=Default Managed Container)
	INFO - Using directory /tmp for stateful session passivation
	INFO - Enterprise application "/home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field" loaded.
	INFO - Assembling app: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
	INFO - ignoreXmlConfiguration == true
	INFO - ignoreXmlConfiguration == true
	INFO - existing thread singleton service in SystemInstance() org.apache.openejb.cdi.ThreadSingletonServiceImpl@a81b1fb
	INFO - OpenWebBeans Container is starting...
	INFO - Adding OpenWebBeansPlugin : [CdiPlugin]
	INFO - All injection points were validated successfully.
	INFO - OpenWebBeans Container has started, it took [69] ms.
	INFO - Deployed Application(path=/home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field)
	##### Handler: @Produces created DatabaseHandler!, Writing to the database!
	INFO - Undeploying app: /home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field
	Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.79 sec

	Results :

	Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
	</div>
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