java barcode library | Appendix E: Message-Driven EJB: Status Update Listeners Example in Java

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552 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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/** * Sends the specified status update to the specified listener */ private void sendMessage(final StatusUpdate newStatus, final MessageListener listener) { // This implementation will send directly (POJO-based) final ObjectMessage message = new MockObjectMessage(newStatus); // Send manually listener.onMessage(message);
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//--------------------------------------------------------------------------|| // Inner Classes -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@link MessageListener} to be invoked in a POJO environment, where the last * incoming status update via {@link MessageListener#onMessage(javax.jms. Message)} * is cached and available for retrieval. Not thread-safe as this is intended to be used * in a single-threaded environment. */ private static class StatusCachingMessageListener extends StatusUpdateBeanBase { private StatusUpdate lastStatus = null; /** * Caches the specified status * @see org.jboss.ejb3.examples.ch08.statusupdate.mdb.StatusUpdateBeanBase# updateStatus(org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate) */ public void updateStatus(final StatusUpdate newStatus) throws Illegal ArgumentException { this.lastStatus = newStatus; } /** * Obtains the last {@link StatusUpdate} received * @return */ StatusUpdate getLastStatus() { return lastStatus; }
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TwitterUpdateBlockingTestMdb.java
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package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import java.util.concurrent.CountDownLatch; import java.util.logging.Logger; import javax.ejb.ActivationConfigProperty; import javax.ejb.MessageDriven; import javax.jms.MessageListener; import org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate; import org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdateConstants; /** * Extends the {@link TwitterUpdateMdb} example to add a latch to * be shared in testing only, such that tests can be sure we're done * processing before they proceed * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ @MessageDriven(name = TwitterUpdateMdb.NAME, activationConfig = { @ActivationConfigProperty(propertyName = "destinationType", propertyValue = StatusUpdateConstants.TYPE_DESTINATION_STATUSUPDATE), @ActivationConfigProperty(propertyName = "destination", propertyValue = StatusUpdateConstants.JNDI_NAME_TOPIC_STATUSUPDATE)}) public class TwitterUpdateBlockingTestMdb extends TwitterUpdateMdb implements MessageListener { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(TwitterUpdateBlockingTest Mdb.class.getName()); /** * Shared latch, so tests can wait until the MDB is processed. In POJO * testing this is wholly unnecessary as we've got a single-threaded environment, but * when testing in an EJB Container running in the *same* JVM as the test, the test * can use this to wait until the MDB has been invoked, strengthening the integrity * of the test. It's not recommended to put this piece into a production EJB; instead * test an extension of your EJB which adds this (and only this) support. */ public static CountDownLatch LATCH = new CountDownLatch(1);
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554 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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//--------------------------------------------------------------------------|| // Overridden Implementations ----------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@inheritDoc} * Additionally waits upon a shared barrier so that the test can ensure we're done before * it proceeds * @see org.jboss.ejb3.examples.ch08.statusupdate.mdb.TwitterUpdateMdb#update Status(org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate) */ @Override public void updateStatus(final StatusUpdate newStatus) throws IllegalArgument Exception, Exception { // Call the super implementation try { super.updateStatus(newStatus); } finally { // Count down the latch log.info("Counting down the latch..."); LATCH.countDown(); } } }
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APPENDIX F
Java Persistence APIs: Employee Registry Example
Description
Enterprise applications frequently need to deal with state which survives application restarts. We call this persistent state, and it s typically modeled by a program called a relational database management system (RDBMS). Handling the transformation/ mapping between the row-based RDBMS and Java objects is a rote process for application developers, so we offload this responsibility to the Java Persistence API (JPA). In this fashion we re free to interact with regular getters/setters on Java objects while the mechanics of getting data into and out of the backing database is handled for us. EJB integrates with JPA via the entity bean, and s 9 through 14 detail the APIs needed to properly model, map, persist, and retrieve data with a real database. Our example is an employee registry, where we apply a variety of techniques to draw relationships between mapped types and query the DB efficiently.
Online Companion Information
Wiki article: http://community.jboss.org/docs/DOC-15572 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch09-14-employeeregistry/
Source Listing
Following is a full listing of all source code used in this runnable example.
Implementation Resources
See 9.
SimpleEmployee.java
package org.jboss.ejb3.examples.employeeregistry.ch09.entitymanager; import javax.persistence.Entity; import javax.persistence.Id; /** * Represents an Employee in the system. Modeled as a simple * value object with some additional EJB and JPA annotations. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ @Entity // Mark that we're an Entity Bean, EJB's integration point // with Java Persistence public class SimpleEmployee { //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Primary key of this entity */ @Id // Mark that this field is the primary key private Long id; /** * Name of the employee */ private String name; //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Default constructor, required by JPA */ public SimpleEmployee() { } /** * Convenience constructor */
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