Examples of org.eclipse.persistence.internal.sessions.coordination.jms.JMSTopicRemoteConnection

org.eclipse.persistence.internal.sessions.coordination.jms.JMSTopicRemoteConnection

Purpose: Define the implementation of the abstract RemoteConnection for JMS.

Description: Executing commands implementation of RemoteConnection is done via JMS Publisher. Using a single TopicConnection for both publishing and subscribing would allow subscriber to ignore messages sent through the same TopicConnection - and therefore allow JMSTopicRemoteConnection to ignore messages that it has itself published. Unfortunately J2EE doesn't allow that: J2EE spec. (J2EE.6.6 in v1.4) states: "The following methods may only be used by application components executing in the application client container: javax.jms.Session method setMessageListener ... Application components in the web and EJB containers must not attempt to create more than one active (not closed) Session object per connection." Because of these restrictions a) two TopicConnections are required - one for publishing (external) and another one for listening (local); b) listening should be done using subscriber.receive() in an infinite loop in a separate thread, that's why the class implements Runnable interface. @author Steven Vo @since OracleAS TopLink 10g (10.0.3)

    /**
     * INTERNAL:
     * caches local connection, set localConnection to null, closes the cached connection in a new thread.
     */
    public void removeLocalConnection() {
        JMSTopicRemoteConnection connectionToRemove = (JMSTopicRemoteConnection)localConnection;
        synchronized(this) {
            if(connectionToRemove == localConnection) {
                localConnection = null;
            } else {
                connectionToRemove = null;
            }
        }
        // closing connection may take time - do it outside of the synchronized block
        if(connectionToRemove != null) {
            connectionToRemove.close();
        }
    }

Examples of org.eclipse.persistence.internal.sessions.coordination.jms.JMSTopicRemoteConnection

Related Classes of org.eclipse.persistence.internal.sessions.coordination.jms.JMSTopicRemoteConnection