| Appendix D: Singleton Session EJB: RSS Cache Example in Java

Creation QR Code in Java | Appendix D: Singleton Session EJB: RSS Cache Example

522 | Appendix D: Singleton Session EJB: RSS Cache Example
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//--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(RssCacheUnitTestCase.class); /** * The bean (POJO) instance to test, mocking a @Singleton EJB */ private static RssCacheCommonBusiness bean; //--------------------------------------------------------------------------|| // Lifecycle ---------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Creates a POJO instance to mock the real Container EJB @Singleton * before any tests are run */ @BeforeClass public static void createPojo() { // Instantiate and set final TestRssCacheBean bean = new TestRssCacheBean(); RssCacheUnitTestCase.bean = bean; log.info("Created POJO instance: " + bean); // Set the URL of the Mock RSS File URL url = null; try { url = new URL(getBaseConnectUrl(), FILENAME_RSS_FEED); } catch (final MalformedURLException murle) { throw new RuntimeException("Error in test setup while constructing the mock RSS feed URL", murle); } bean.setUrl(url); // Mock container initialization upon the bean bean.refresh();
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/** * Resets the POJO instance to null after all tests are run */ @AfterClass public static void clearPojo()
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// Set to null so we don't ever leak instances between test runs bean = null;
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//--------------------------------------------------------------------------|| // Required Implementations ------------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@inheritDoc} * @see org.jboss.ejb3.examples.ch07.envinfo.EnvironmentInformationTestCase Base#getEnvInfoBean() */ @Override protected RssCacheCommonBusiness getRssCacheBean() { return bean; } //--------------------------------------------------------------------------|| // Internal Helper Methods -------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Obtains the base of the code source */ private static URL getBaseConnectUrl() { try { return new URL("http://localhost:" + HTTP_TEST_BIND_PORT); } catch (final MalformedURLException e) { throw new RuntimeException("Error in creating the base URL during set setup", e); } } }
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TestRssCacheBean.java
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package org.jboss.ejb3.examples.ch07.rsscache.impl.rome; import java.net.URL; /** * Extension of the RSS Cache Bean which exposes support to * set the Feed URL for testing * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */
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524 | Appendix D: Singleton Session EJB: RSS Cache Example
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public class TestRssCacheBean extends RssCacheBean { //--------------------------------------------------------------------------|| // Overridden Implementations ----------------------------------------------|| //--------------------------------------------------------------------------|| /* (non-Javadoc) * @see org.jboss.ejb3.examples.ch07.rsscache.impl.rome.RssCacheBean#setUrl (java.net.URL) */ @Override public void setUrl(final URL url) throws IllegalArgumentException { super.setUrl(url); } }
jndi.properties
# JNDI Properties for Remote interaction with JBoss Application Server Naming Service java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=jnp://localhost:1099
APPENDIX E
Message-Driven EJB: Status Update Listeners Example
Description
Session beans, as we ve seen up to this point, are best suited for servicing client requests. Many enterprise systems, however, use a messaging layer to asynchronously pass requests from application to application. In Java, we use the Java Message Service abstraction to push/pull messages via Queues and Topics, and the integration of JMS with EJB is the message-driven bean. In this example, we implement social networking status updates via a consumer/ publisher Topic. Anyone listening on the Topic will receive incoming status updates, and we create 2 listeners: 1 simple one to log out to the command-line or logfile, and another to push the updates to Twitter. Note: Set the environment variables below before running to take advantage of the Twitter updates while running the tests.
OREILLY_EJB_BOOK_CH08_TWITTER_USERNAME OREILLY_EJB_BOOK_CH08_TWITTER_PASSWORD
Additionally, in this example we show how the use of a single JVM for the test and the server can be used to enable shared memory locking (i.e., java.util.concurrent) to reliably test that asynchronous components have completed as expected.
Online Companion Information
Wiki article: http://community.jboss.org/docs/DOC-15570 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch08-statusupdate/
Source Listing
Following is a full listing of all source code used in this runnable example.
Implementation Resources
StatusUpdate.java
package org.jboss.ejb3.examples.ch08.statusupdate.api; import java.io.Serializable; /** * Encapsulates a single generic status update. * * As this implementation is only used to show an example of * JMS and EJB MDB processing, we don't follow * strict contracts for {@link Serializable} and accept * the default serialized form. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ public class StatusUpdate implements Serializable { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * serialVersionUID */ private static final long serialVersionUID = 1L; //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Internal status */ private final String status; //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Creates a new status update with the specified new status * * @throws IllegalArgumentException If either the status or username is not specified */ public StatusUpdate(final String status) throws IllegalArgumentException
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