java applet qr code | Appendix E: Message-Driven EJB: Status Update Listeners Example in Java

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538 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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StatusUpdateBeanBase.java
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package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import java.io.Serializable; import java.util.logging.Logger; import import import import javax.jms.JMSException; javax.jms.Message; javax.jms.MessageListener; javax.jms.ObjectMessage;
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import org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate; /** * Base support for the StatusUpdateEJB. Responsible for * consuming an incoming JMS Message and dispatching to * {@link StatusUpdateBeanBase#updateStatus(StatusUpdate)}. Children * are required to supply specialization of this method. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ public abstract class StatusUpdateBeanBase implements MessageListener { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(StatusUpdateBeanBase.class. getName()); //--------------------------------------------------------------------------|| // Contracts ---------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Updates status to the specified value. * * @throws IllegalArgumentException If the new status is not specified * @throws Exception If an error occured in processing */ public abstract void updateStatus(StatusUpdate newStatus) throws Illegal ArgumentException, Exception;
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//--------------------------------------------------------------------------|| // Required Implementations ------------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@inheritDoc} * @see javax.jms.MessageListener#onMessage(javax.jms.Message) */ @Override public void onMessage(final Message message) { /* * Precondition checks * */ // Ensure the message is specified if (message == null) { throw new IllegalArgumentException("Message must be specified"); } // Ensure the message is in expected form final ObjectMessage objMessage; if (message instanceof ObjectMessage) { objMessage = (ObjectMessage) message; } else { throw new IllegalArgumentException("Specified message must be of type " + ObjectMessage.class.getName()); } // Extract out the embedded status update final Serializable obj; try { obj = objMessage.getObject(); } catch (final JMSException jmse) { throw new IllegalArgumentException("Could not obtain contents of message " + objMessage); } // Ensure expected type final StatusUpdate status; if (obj instanceof StatusUpdate) { status = (StatusUpdate) obj; } else { throw new IllegalArgumentException("Contents of message should be of type " + StatusUpdate.class.getName()
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540 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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// Process the update try { this.updateStatus(status); } catch (final Exception e) { throw new RuntimeException("Encountered problem with processing status update " + status, e); } } }
TwitterUpdateMdb.java
package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import java.util.logging.Logger; import javax.annotation.PostConstruct; import javax.jms.MessageListener; import org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate; import twitter4j.Twitter; /** * EJB 3.x MDB which will act as an adaptor to the Twitter API, updating * Twitter status on incoming messages. * * The environment must first support Twitter integration by way of a username/ password * pair available from environment properties. {@link EnvironmentSpecificTwitter ClientUtil} * has more details. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @see http://twitter.com * @see http://yusuke.homeip.net/twitter4j/en/index.html */ public class TwitterUpdateMdb extends StatusUpdateBeanBase implements Message Listener { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(TwitterUpdateMdb.class.get
Name()); /** * EJB Name */ static final String NAME = "TwitterUpdateMdb"; //--------------------------------------------------------------------------|| // Constructors ------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Creates a new instance, required as no-arg ctor by specification */ public TwitterUpdateMdb() { } //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Underlying client used in updating Twitter by calling upon its API */ private Twitter client; //--------------------------------------------------------------------------|| // Lifecycle ---------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Lifecycle start to create the Twitter client from supplied environment properties, * if the environment has been configured to do so */ @PostConstruct void createTwitterClient() { if (!EnvironmentSpecificTwitterClientUtil.isSupportedEnvironment()) { log.warning(EnvironmentSpecificTwitterClientUtil.MSG_UNSUPPORTED_ ENVIRONMENT); return; } // Create the client client = EnvironmentSpecificTwitterClientUtil.getTwitterClient(); log.info("Created Twitter client " + client);
}
//--------------------------------------------------------------------------|| // Required Implementations ------------------------------------------------|| //--------------------------------------------------------------------------||
542 | Appendix E: Message-Driven EJB: Status Update Listeners Example
/** * Sends incoming status updates to the Twitter account configured in the * context properties. * * @see org.jboss.ejb3.examples.ch08.statusupdate.mdb.StatusUpdateBeanBase #updateStatus(org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate) */ @Override public void updateStatus(final StatusUpdate newStatus) throws IllegalArgument Exception, Exception { // Ensure the client's been initialized (if the environment permits) if (!EnvironmentSpecificTwitterClientUtil.isSupportedEnvironment()) { // Do nothing and get out return; } if (client == null) { throw new IllegalStateException("Twitter client has not been initialized "); } // Extract status final String status = newStatus.getText(); // Update status client.updateStatus(status);
}
}
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