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RequestListenerImpl.javaAPI DocphoneME MR2 API (J2ME)3259Wed May 02 18:00:44 BST 2007com.sun.midp.content

RequestListenerImpl

public class RequestListenerImpl extends Object implements Runnable
Thread to monitor pending invocations and notify a listener when a matching one is present.

Fields Summary
private final ContentHandlerImpl
handler
ContenHandlerImpl for which this is listening.
private Thread
thread
The active thread processing the run method.
Constructors Summary
RequestListenerImpl(ContentHandlerImpl handler, javax.microedition.content.RequestListener listener)
Create a new listener for pending invocations.

param
handler the ContentHandlerImpl to listen for
param
listener the listener to notify when present

	this.handler = handler;
	setListener(listener);
Methods Summary
public voidrun()
The run method checks for pending invocations for a desired ContentHandler or application. When an invocation is available the listener is notified.

	Thread mythread = Thread.currentThread();
	while (mythread == thread) {
	    // Wait for a matching invocation
	    boolean pending =
		InvocationStore.listen(handler.storageId,
				       handler.classname,
				       true, true);
	    if (pending) {
		handler.requestNotify();
	    }
	}
voidsetListener(javax.microedition.content.RequestListener listener)
Set the listener to be notified and start/stop the monitoring thread as necesary. If the listener is non-null make sure there is a thread active to monitor it. If there is no listener, then stop the monitor thread. Unblock any blocked threads so they can get the updated listener.

param
listener the listener to update


	if (listener != null) {
	    // Ensure a thread is running to watch for it
	    if (thread == null || !thread.isAlive()) {
		thread = new Thread(this);
		thread.start();
	    }
	} else {
	    // Forget the thread doing the listening; it will exit
	    thread = null;
	}

	/*
	 * Reset notified flags on pending requests.
	 * Unblock any threads waiting to notify current listeners
	 */
	InvocationStore.setListenNotify(handler.storageId,
					handler.classname, true);
	InvocationStore.cancel();