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

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528 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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// Precondition checks if (status == null || status.length() == 0) { throw new IllegalArgumentException("Status must be specified"); } // Set this.status = status;
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//--------------------------------------------------------------------------|| // Functional Methods ------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Returns the new status * @return the status */ public String getText() { return status; } //--------------------------------------------------------------------------|| // Overridden Implementations ----------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@inheritDoc} * @see java.lang.Object#toString() */ @Override public String toString() { return this.getClass().getSimpleName() + " [status=" + status + "]"; } /** * {@inheritDoc} * @see java.lang.Object#hashCode() */ @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((status == null) 0 : status.hashCode()); return result; } /** * {@inheritDoc} * @see java.lang.Object#equals(java.lang.Object) */
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@Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; StatusUpdate other = (StatusUpdate) obj; if (status == null) { if (other.status != null) return false; } else if (!status.equals(other.status)) return false; return true; }
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StatusUpdateConstants.java
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package org.jboss.ejb3.examples.ch08.statusupdate.api; import javax.management.ObjectName; /** * Contains constants used in referring to resources shared * by clients of the StatusUpdate MDBs. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ public interface StatusUpdateConstants { //--------------------------------------------------------------------------|| // Contracts ---------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * JNDI Name of the pub/sub Topic for status updates */ String JNDI_NAME_TOPIC_STATUSUPDATE = "topic/StatusUpdate"; /** * The type of destination used by StatusUpdate MDB implementations */ String TYPE_DESTINATION_STATUSUPDATE = "javax.jms.Topic"; /** * The JMX {@link ObjectName} which will be used as a dependency name for the Topic */
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530 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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String OBJECT_NAME_TOPIC_STATUSUPDATE = "jboss.messaging.destination:service= Topic,name=StatusUpdate"; }
EnvironmentSpecificTwitterUtil.java
package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import twitter4j.Twitter; /** * A stateless class used in creating new instances of the {@link Twitter} * client. In practice we'd never take this approach, where creation is * dependent upon a username/password credential set obtained from the * environment. In these examples we must both externalize these properties * such that the EJBs using them may be configured, but also hide * default values for the sake of security. * * It is not advised to take this approach in real systems. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ public class EnvironmentSpecificTwitterClientUtil { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Environment variable of the Twitter username */ private static final String ENV_VAR_NAME_TWITTER_USERNAME = "OREILLY_EJB_BOOK_ CH08_TWITTER_USERNAME"; /** * Environment variable of the Twitter password */ private static final String ENV_VAR_NAME_TWITTER_PASSWORD = "OREILLY_EJB_BOOK_ CH08_TWITTER_PASSWORD"; /** * Message dictating that the environment does not support Twitter integration */ static final String MSG_UNSUPPORTED_ENVIRONMENT = "Both environment variables \"" + ENV_VAR_NAME_TWITTER_USERNAME + "\" and \"" + ENV_VAR_NAME_TWITTER_PASSWORD + "\" must be specified for this test to run"; //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------||
//--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| private EnvironmentSpecificTwitterClientUtil() { throw new UnsupportedOperationException("No instantiation allowed"); } //--------------------------------------------------------------------------|| // Utility Methods ---------------------------------------------------------|| //--------------------------------------------------------------------------|| static boolean isSupportedEnvironment() { // Obtain the username and password final UsernamePasswordCredentials creds = getCredentials(); final String username = creds.username; final String password = creds.password; /* * Only continue if these are specified, otherwise log out a warning and skip this * test. Ordinarily you should NOT test based upon the environment, but in this * case we cannot put username/password combinations in SVN due to security constraints, * and this test interacts with an outside service which we do not control and cannot mock * locally (which would default the purpose of showing how MDBs can be used to asynchronously * integrate with other systems). * * Typically we'd first enforce the executing environment, but we can't assume that * all users of this example have a Twitter account. */ if (username == null || password == null) { return false; } // All good return true;
}
/** * Obtains a Twitter client for the username and password as specified from * the environment. If the environment is not fully set up, an {@link Illegal StateException} * will be raised noting the environment variables expected to be in place. To avoid the ISE * first check for the integrity of the environment by using * {@link EnvironmentSpecificTwitterClientUtil#isSupportedEnvironment()} *
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