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              <h1>CDI field producer</h1>
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            <div class="col-md-12">
                <p>This example shows the usage of the @Produces annotation. @Produces is a CDI mechanism which allows defining a source<br/> for injection. This example shows one of two ways of declaring a producer. Instead of a producer method (see CDI-produces-disposes example)<br/>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<br/> methods is that a @Disposes method cannot be used in conjunction with @Produces field.</p>
<h2>ConsoleHandler</h2>
<pre><code>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(&quot;##### Handler: %s, Writing to the console!\n&quot;, getName());
    }
}
</code></pre>
<h2>DatabaseHandler</h2>
<pre><code>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(&quot;##### Handler: %s, Writing to the database!\n&quot;, getName());
        // Use connection to write log to database
    }
}
</code></pre>
<h2>FileHandler</h2>
<pre><code>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(&quot;##### Handler: %s, Writing to the file!\n&quot;, getName());
        // Write to log file
    }
}
</code></pre>
<h2>LogFactory</h2>
<pre><code>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(&quot;@Produces created FileHandler!&quot;);
            case 2:
                return new DatabaseHandler(&quot;@Produces created DatabaseHandler!&quot;);
            case 3:
            default:
                return new ConsoleHandler(&quot;@Produces created ConsoleHandler!&quot;);
        }

    }
}
</code></pre>
<h2>Logger</h2>
<pre><code>package org.superbiz.cdi.produces.field;

public interface Logger {

    public void log(String s);

    public LogHandler getHandler();
}
</code></pre>
<h2>LoggerImpl</h2>
<pre><code>package org.superbiz.cdi.produces.field;

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

@Named(&quot;logger&quot;)
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>
<h2>LogHandler</h2>
<pre><code>package org.superbiz.cdi.produces.field;

public interface LogHandler {

    public String getName();

    public void writeLog(String s);
}
</code></pre>
<h2>beans.xml</h2>
<pre><code>&lt;beans xmlns=&quot;http://java.sun.com/xml/ns/javaee&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
       xsi:schemaLocation=&quot;http://java.sun.com/xml/ns/javaee
                            http://java.sun.com/xml/ns/javaee/beans_1_0.xsd&quot;&gt;

&lt;/beans&gt;
</code></pre>
<h2>LoggerTest</h2>
<pre><code>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(&quot;inject&quot;, this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

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

}
</code></pre>
<h1>Running</h1>
<pre><code>-------------------------------------------------------
 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 &#39;javax.ejb.embeddable.EJBContainer=true&#39;
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=&#39;&#39;, openejb.deployments.classpath.include=&#39;.*&#39;
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 &quot;/home/daniel/projects/openejb/source/openejb/examples/cdi-produces-field&quot; 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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