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

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532 | Appendix E: Message-Driven EJB: Status Update Listeners Example
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* @throws IllegalStateException If the environment does not support creation of a Twitter client */ static Twitter getTwitterClient() throws IllegalStateException { // Obtain the username and password final String username = SecurityActions.getEnvironmentVariable(ENV_VAR_NAME _TWITTER_USERNAME); final String password = SecurityActions.getEnvironmentVariable(ENV_VAR_NAME _TWITTER_PASSWORD); /* * We're only supported if both the username and password have been set */ if (!isSupportedEnvironment()) { throw new IllegalStateException(MSG_UNSUPPORTED_ENVIRONMENT); } // Get a Twitter client final Twitter twitterClient = new Twitter(username, password); // Return return twitterClient;
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//--------------------------------------------------------------------------|| // Internal Helper Methods -------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Obtains the username/password credentials from the environment * @return */ private static UsernamePasswordCredentials getCredentials() { // Obtain the username and password final String username = SecurityActions.getEnvironmentVariable(ENV_VAR_NAME _TWITTER_USERNAME); final String password = SecurityActions.getEnvironmentVariable(ENV_VAR_NAME _TWITTER_PASSWORD); // Return as unified view final UsernamePasswordCredentials creds = new UsernamePasswordCredentials(); creds.username = username; creds.password = password; return creds;
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//--------------------------------------------------------------------------|| // Inner Classes -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Simple value object to encapsulate a username/password pair
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* * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ private static class UsernamePasswordCredentials { private String username; } private String password;
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LoggingStatusUpdateMdb.java
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package org.jboss.ejb3.examples.ch08.statusupdate.mdb; 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; /** * An MDB which, {@link MessageListener#onMessage(javax.jms.Message)}, will * log out the status update at INFO-level. * * Not explicitly tested by the examples (because we can't test for logging), * but its usage should be illustrative. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ @MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName = "destinationType", propertyValue = StatusUpdateConstants.TYPE_DESTINATION_STATUSUPDATE), @ActivationConfigProperty(propertyName = "destination", propertyValue = StatusUpdateConstants.JNDI_NAME_TOPIC_STATUSUPDATE)}) public class LoggingStatusUpdateMdb extends StatusUpdateBeanBase implements MessageListener { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(LoggingStatusUpdateMdb. class.getName());
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534 | Appendix E: Message-Driven EJB: Status Update Listeners Example
//--------------------------------------------------------------------------|| // Required Implementations ------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logs status out at INFO-level * @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 { // Precondition checks if (newStatus == null) { throw new IllegalArgumentException("status must be specified"); } // Get info final String status = newStatus.getText(); // Log log.info("New status received: \"" + status + "\"");
} }
SecurityActions.java
package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import java.security.AccessController; import java.security.PrivilegedAction; /** * Protected security actions not to leak outside this package * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ class SecurityActions { //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * No external instantiation */ private SecurityActions() { }
//--------------------------------------------------------------------------|| // Utility Methods ---------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Obtains the Thread Context ClassLoader */ static ClassLoader getThreadContextClassLoader() { return AccessController.doPrivileged(GetTcclAction.INSTANCE); } /** * Sets the specified CL upon the current Thread's Context * * @param cl * @throws IllegalArgumentException If the CL was null */ static void setThreadContextClassLoader(final ClassLoader cl) throws Illegal ArgumentException { if (cl == null) { throw new IllegalArgumentException("ClassLoader was null"); } AccessController.doPrivileged(new PrivilegedAction<Void>() { public Void run() { Thread.currentThread().setContextClassLoader(cl); return null; }; });
}
/** * Obtains the environment variable with the specified name, or null * if not present * @param envVarName * @return * @throws IllegalArgumentException If the environment variable name was not specified */ static String getEnvironmentVariable(final String envVarName) throws Illegal ArgumentException { // Precondition checks if (envVarName == null || envVarName.length() == 0) { throw new IllegalArgumentException("Environment variable name was not specified"); }
536 | Appendix E: Message-Driven EJB: Status Update Listeners Example
// Return return AccessController.doPrivileged(new GetEnvironmentVariableAction(env VarName)); } /** * Obtains the system property with the specified * * @param key * @return * @throws IllegalArgumentException If the key is */ static String getSystemProperty(final String key) Exception { // Precondition check if (key == null) { throw new IllegalArgumentException("key was } key
null throws IllegalArgument
null");
}
// Get sysprop return AccessController.doPrivileged(new GetSystemPropertyAction(key));
//--------------------------------------------------------------------------|| // Inner Classes -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * {@link PrivilegedAction} action to obtain the TCCL */ private enum GetTcclAction implements PrivilegedAction<ClassLoader> { INSTANCE; @Override public ClassLoader run() { return Thread.currentThread().getContextClassLoader(); }
}
/** * {@link PrivilegedAction} to access an environment variable * * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ private static class GetEnvironmentVariableAction implements PrivilegedAction <String> { /** * Name of the environment variable to get
*/ private String envVarName; /** * Creates a new instance capable of obtaining the specified environment variable name * @param envVarName */ public GetEnvironmentVariableAction(final String envVarName) { this.envVarName = envVarName; } /** * {@inheritDoc} * @see java.security.PrivilegedAction#run() */ @Override public String run() { return System.getenv(envVarName); }
}
/** * {@link PrivilegedAction} to access a system property * * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ private static class GetSystemPropertyAction implements PrivilegedAction<String> { /** * Name of the sysprop to get */ private String sysPropName; /** * Creates a new instance capable of obtaining the specified system property by name * @param sysPropName */ public GetSystemPropertyAction(final String sysPropName) { this.sysPropName = sysPropName; } /** * {@inheritDoc} * @see java.security.PrivilegedAction#run() */ @Override public String run()
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