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

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     <div id="main-block" class="container main-block">
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               <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>Este exemplo mostra o uso da anotação <code>@Produces</code>. <code>@Produces</code> é um mecanismo do CDI que permite definir uma fonte para injeção. Este exemplo mostra uma das duas formas de declarar um producer. Ao invés de um produces method (veja no exemplo CDI-produces-disposes), um producer field pode ser usado. Um producer field pode ser usado ao invés de um simples método getter. Isso pode ser usado para injetar recursos como, contexto de persistência. Uma ressalva para o uso de produces fields sobre produces method é que um método <code>@Disposes</code> não pode ser usado junto de um <code>@Produces</code> field.</p>
 </div>
 <div class="paragraph">
 <p>Para o proposito deste exemplo, <code>type</code> é hard-coded em um valor especifico. Uma implementação de Logger deve conter uma lista de LogHandlers. Nós devemos ter três implementações da interface LogHandler.</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>Uma DatabaseHandler</p>
 </li>
 <li>
 <p>Uma FileHandler</p>
 </li>
 <li>
 <p>Uma ConsoleHandler</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p>A implementação DatabaseHandler aparentemente gravaria os logs em um banco de dados. O FileHandler gravaria os mesmos logs em um arquivo. E o ConsoleHandler apenas imprimiria os logs no console. Este exemplo é apenas uma ilustração de como os conceitos dentro do CDI funcionam e não tem a intenção de fornecer uma implementação/design de estrutura de log.</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());
         // Escreve para o arquivo de log
     }
 }</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="_executando" class="sect0">Executando</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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	<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>Este exemplo mostra o uso da anotação <code>@Produces</code>. <code>@Produces</code> é um mecanismo do CDI que permite definir uma fonte para injeção. Este exemplo mostra uma das duas formas de declarar um producer. Ao invés de um produces method (veja no exemplo CDI-produces-disposes), um producer field pode ser usado. Um producer field pode ser usado ao invés de um simples método getter. Isso pode ser usado para injetar recursos como, contexto de persistência. Uma ressalva para o uso de produces fields sobre produces method é que um método <code>@Disposes</code> não pode ser usado junto de um <code>@Produces</code> field.</p>
	</div>
	<div class="paragraph">
	<p>Para o proposito deste exemplo, <code>type</code> é hard-coded em um valor especifico. Uma implementação de Logger deve conter uma lista de LogHandlers. Nós devemos ter três implementações da interface LogHandler.</p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>Uma DatabaseHandler</p>
	</li>
	<li>
	<p>Uma FileHandler</p>
	</li>
	<li>
	<p>Uma ConsoleHandler</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p>A implementação DatabaseHandler aparentemente gravaria os logs em um banco de dados. O FileHandler gravaria os mesmos logs em um arquivo. E o ConsoleHandler apenas imprimiria os logs no console. Este exemplo é apenas uma ilustração de como os conceitos dentro do CDI funcionam e não tem a intenção de fornecer uma implementação/design de estrutura de log.</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());
	// Escreve para o arquivo de log
	}
	}</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="_executando" class="sect0">Executando</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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