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/*
* Copyright 1999-2008 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;
/**
* The TimerThread is thread that handle WakeupOnElapsedTime call.
* There is only one thread for the whole system.
*/
class TimerThread 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 WakeupOnElapsedTimeHeap heap = new WakeupOnElapsedTimeHeap();
// Wakeup InputDeviceScheduler for every sample time reach
private WakeupOnElapsedTime inputDeviceSchedCond =
new WakeupOnElapsedTime(InputDeviceScheduler.samplingTime);
// Wakeup {all?} Sound Scheduler{s} for every sample time reach
// QUESTION: this sampling time is set to a very large value so Sound
// Schedulers are not pinged often unless explicitly requested
// XXXX: need a way to remove/null this condition when all
// soundschedulers are halted
private WakeupOnElapsedTime soundSchedCond =
new WakeupOnElapsedTime(120000); // every 2 minutes
private volatile boolean running = true;
private boolean waiting = false;
private boolean ready = false;
TimerThread(ThreadGroup t) {
super(t, "J3D-TimerThread");
}
// call from UserThread
void add(WakeupOnElapsedTime wakeup) {
synchronized (heap) {
heap.insert(wakeup);
}
runMonitor(NOTIFY, 0);
}
void addInputDeviceSchedCond() {
inputDeviceSchedCond.triggeredTime =
InputDeviceScheduler.samplingTime +
J3dClock.currentTimeMillis();
add(inputDeviceSchedCond);
}
void addSoundSchedCond(long wakeupTime) {
// XXXX: there are potentially multiple sound schedulers.
// this code will force a wait up on ALL sound schedulers
// even though only one needs to process the sound that
// this wakeup condition is triggered by.
soundSchedCond.triggeredTime = wakeupTime;
add(soundSchedCond);
}
// call from MasterThread
void finish() {
runMonitor(STOP, 0);
}
void remove(WakeupOnElapsedTime w) {
synchronized (heap) {
heap.extract(w);
}
}
@Override
public void run() {
long waitTime = -1;
long time;
WakeupOnElapsedTime cond;
while (running) {
runMonitor(WAIT, waitTime);
time = J3dClock.currentTimeMillis();
while (true) {
cond = null;
waitTime = -1;
synchronized (heap) {
if (!heap.isEmpty()) {
waitTime = heap.getMin().triggeredTime - time;
if (waitTime <= 0) {
cond = heap.extractMin();
}
}
}
if (cond == null) {
break;
} else if (cond == inputDeviceSchedCond) {
VirtualUniverse.mc.sendRunMessage(
J3dThread.INPUT_DEVICE_SCHEDULER);
} else if (cond == soundSchedCond) {
VirtualUniverse.mc.sendRunMessage(
J3dThread.SOUND_SCHEDULER);
} else {
cond.setTriggered();
}
}
}
}
synchronized void runMonitor(int action, long waitTime) {
switch (action) {
case WAIT:
// Issue 308 - wait unless ready flag already set
// Note that we can't loop since we need to be able to timeout
// after "waitTime" msec
if (running && !ready) {
waiting = true;
try {
if (waitTime < 0) {
wait();
} else {
wait(waitTime);
}
} catch (InterruptedException e) {}
waiting = false;
}
ready = false;
break;
case NOTIFY:
ready = true;
if (waiting) {
notify();
}
break;
case STOP:
running = false;
notify();
break;
}
}
}
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