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/*
* Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
import java.util.ArrayList;
/**
* The NotificationThread class is used for asynchronous error notification,
* such as notifying ShaderError listeners.
*/
class NotificationThread extends Thread {
// action flag for runMonitor
private static final int WAIT = 0;
private static final int NOTIFY = 1;
private static final int STOP = 2;
private volatile boolean running = true;
private boolean waiting = false;
private boolean ready = false;
private ArrayList<J3dNotification> notificationQueue = new ArrayList<J3dNotification>();
/**
* Creates a new instance of NotificationThread
*/
NotificationThread(ThreadGroup t) {
// Only one notification thread for the entire system
super(t, "J3D-NotificationThread");
}
/**
* Adds a notification message to the queue
*/
synchronized void addNotification(J3dNotification n) {
notificationQueue.add(n);
runMonitor(NOTIFY);
}
/**
* Gets the list of queued notification messages
*/
private synchronized J3dNotification[] getNotifications() {
J3dNotification[] n = new J3dNotification[notificationQueue.size()];
n = notificationQueue.toArray(n);
notificationQueue.clear();
return n;
}
/**
* Processes all pending notification messages
*/
private void processNotifications() {
J3dNotification[] notifications = getNotifications();
for (int i = 0; i < notifications.length; i++) {
J3dNotification n = notifications[i];
switch (n.type) {
case J3dNotification.SHADER_ERROR:
n.universe.notifyShaderErrorListeners((ShaderError)n.args[0]);
break;
case J3dNotification.RENDERING_ERROR:
VirtualUniverse.notifyRenderingErrorListeners((RenderingError)n.args[0]);
break;
default:
System.err.println("J3dNotification.processNotifications: unrecognized type = " + n.type);
}
}
}
// Called from MasterControlThread
void finish() {
runMonitor(STOP);
}
@Override
public void run() {
while (running) {
runMonitor(WAIT);
processNotifications();
}
// System.err.println("Notification thread finished");
}
private synchronized void runMonitor(int action) {
switch (action) {
case WAIT:
while (running && !ready) {
waiting = true;
try {
wait();
} catch (InterruptedException e) {
}
waiting = false;
}
ready = false;
break;
case NOTIFY:
ready = true;
if (waiting) {
notify();
}
break;
case STOP:
running = false;
notify();
break;
default:
// Should never get here...
assert(false);
}
}
}
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