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Telephone Stateful

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This example shows how to use OpenEJB’s remoting capabilities in an embedded scenario.

The basic recipe is the same for a standard embedded scenario but with these added ingreditents:

  • openejb.embedded.remotable property

  • openejb-ejbd jar

While creating the InitialContext, pass in the openejb.embedded.remotable property with the value of ``true''. When this is seen by the LocalInitialContextFactory, it will boot up the Server ServiceManager in the VM which will in turn look for ServerServices in the classpath.

Provided you have the openejb-ejbd jar in your classpath along with it’s dependencies (openejb-server, openejb-client, openejb-core), then those services will be brought online and remote clients will be able to connect into your vm and invoke beans.

If you want to add more ServerServices such as the http version of the ejbd protocol you’d simply add the openejb-httpejbd jar to your classpath. A number of ServerServices are available currently:

  • openejb-ejbd

  • openejb-http

  • openejb-telnet

  • openejb-derbynet

  • openejb-hsql

  • openejb-activemq

Telephone

package org.superbiz.telephone;

public interface Telephone {

    void speak(String words);

    String listen();
}

TelephoneBean

package org.superbiz.telephone;

import jakarta.ejb.Remote;
import jakarta.ejb.Stateful;
import java.util.ArrayList;
import java.util.List;

@Remote
@Stateful
public class TelephoneBean implements Telephone {

    private static final String[] answers = {
            "How nice.",
            "Oh, of course.",
            "Interesting.",
            "Really?",
            "No.",
            "Definitely.",
            "I wondered about that.",
            "Good idea.",
            "You don't say!",
    };

    private List<String> conversation = new ArrayList<String>();

    public void speak(String words) {
        conversation.add(words);
    }

    public String listen() {
        if (conversation.size() == 0) {
            return "Nothing has been said";
        }

        String lastThingSaid = conversation.get(conversation.size() - 1);
        return answers[Math.abs(lastThingSaid.hashCode()) % answers.length];
    }
}

TelephoneTest

package org.superbiz.telephone;

import junit.framework.TestCase;

import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.Properties;

/**
 * @version $Rev: 1090810 $ $Date: 2011-04-10 07:49:26 -0700 (Sun, 10 Apr 2011) $
 */
public class TelephoneTest extends TestCase {

    protected void setUp() throws Exception {
        Properties properties = new Properties();
        properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.core.LocalInitialContextFactory");
        properties.setProperty("openejb.embedded.remotable", "true");
        // Uncomment these properties to change the defaults
        //properties.setProperty("ejbd.port", "4202");
        //properties.setProperty("ejbd.bind", "localhost");
        //properties.setProperty("ejbd.threads", "200");
        //properties.setProperty("ejbd.disabled", "false");
        //properties.setProperty("ejbd.only_from", "127.0.0.1,192.168.1.1");

        new InitialContext(properties);
    }

    /**
     * Lookup the Telephone bean via its remote interface but using the LocalInitialContextFactory
     *
     * @throws Exception
     */
    public void testTalkOverLocalNetwork() throws Exception {

        Properties properties = new Properties();
        properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.core.LocalInitialContextFactory");
        InitialContext localContext = new InitialContext(properties);

        Telephone telephone = (Telephone) localContext.lookup("TelephoneBeanRemote");

        telephone.speak("Did you know I am talking directly through the embedded container?");

        assertEquals("Interesting.", telephone.listen());


        telephone.speak("Yep, I'm using the bean's remote interface but since the ejb container is embedded " +
                "in the same vm I'm just using the LocalInitialContextFactory.");

        assertEquals("Really?", telephone.listen());


        telephone.speak("Right, you really only have to use the RemoteInitialContextFactory if you're in a different vm.");

        assertEquals("Oh, of course.", telephone.listen());
    }

    /**
     * Lookup the Telephone bean via its remote interface using the RemoteInitialContextFactory
     *
     * @throws Exception
     */
    public void testTalkOverRemoteNetwork() throws Exception {
        Properties properties = new Properties();
        properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
        properties.setProperty(Context.PROVIDER_URL, "ejbd://localhost:4201");
        InitialContext remoteContext = new InitialContext(properties);

        Telephone telephone = (Telephone) remoteContext.lookup("TelephoneBeanRemote");

        telephone.speak("Is this a local call?");

        assertEquals("No.", telephone.listen());


        telephone.speak("This would be a lot cooler if I was connecting from another VM then, huh?");

        assertEquals("I wondered about that.", telephone.listen());


        telephone.speak("I suppose I should hangup and call back over the LocalInitialContextFactory.");

        assertEquals("Good idea.", telephone.listen());


        telephone.speak("I'll remember this though in case I ever have to call you accross a network.");

        assertEquals("Definitely.", telephone.listen());
    }
}

Running

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.superbiz.telephone.TelephoneTest
Apache OpenEJB 4.0.0-beta-1    build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/telephone-stateful
INFO - openejb.base = /Users/dblevins/examples/telephone-stateful
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 - Found EjbModule in classpath: /Users/dblevins/examples/telephone-stateful/target/classes
INFO - Beginning load: /Users/dblevins/examples/telephone-stateful/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/telephone-stateful/classpath.ear
INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-id=Default Stateful Container)
INFO - Auto-creating a container for bean TelephoneBean: Container(type=STATEFUL, id=Default Stateful Container)
INFO - Enterprise application "/Users/dblevins/examples/telephone-stateful/classpath.ear" loaded.
INFO - Assembling app: /Users/dblevins/examples/telephone-stateful/classpath.ear
INFO - Jndi(name=TelephoneBeanRemote) --> Ejb(deployment-id=TelephoneBean)
INFO - Jndi(name=global/classpath.ear/telephone-stateful/TelephoneBean!org.superbiz.telephone.Telephone) --> Ejb(deployment-id=TelephoneBean)
INFO - Jndi(name=global/classpath.ear/telephone-stateful/TelephoneBean) --> Ejb(deployment-id=TelephoneBean)
INFO - Created Ejb(deployment-id=TelephoneBean, ejb-name=TelephoneBean, container=Default Stateful Container)
INFO - Started Ejb(deployment-id=TelephoneBean, ejb-name=TelephoneBean, container=Default Stateful Container)
INFO - Deployed Application(path=/Users/dblevins/examples/telephone-stateful/classpath.ear)
INFO - Initializing network services
INFO - Creating ServerService(id=admin)
INFO - Creating ServerService(id=ejbd)
INFO - Creating ServerService(id=ejbds)
INFO - Initializing network services
  ** Starting Services **
  NAME                 IP              PORT
  admin thread         127.0.0.1       4200
  ejbd                 127.0.0.1       4201
  ejbd                 127.0.0.1       4203
-------
Ready!
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.448 sec

Results :

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0

APIs Used