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/*
* Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*/
package jogamp.newt;
import java.util.ArrayList;
import com.jogamp.nativewindow.NativeWindowException;
import jogamp.common.util.locks.LockDebugUtil;
import com.jogamp.common.ExceptionUtils;
import com.jogamp.common.util.InterruptSource;
import com.jogamp.common.util.InterruptedRuntimeException;
import com.jogamp.common.util.RunnableTask;
import com.jogamp.common.util.locks.Lock;
import com.jogamp.newt.util.EDTUtil;
public class DefaultEDTUtil implements EDTUtil {
public static final boolean DEBUG = Debug.debug("EDT");
/** Used to implement {@link #invokeStop(boolean, Runnable)}. */
private static final Object TASK_ATTACHMENT_STOP = new Object();
/** Used to provoke an exception on the EDT while waiting / blocking. Merely exists to test code.*/
private static final Object TASK_ATTACHMENT_TEST_ERROR = new Object();
private final Object edtLock = new Object(); // locking the EDT start/stop state
private /* final */ ThreadGroup threadGroup;
private final String name;
private final Runnable dispatchMessages;
private NEDT edt = null;
private int start_iter=0;
private static long pollPeriod = EDTUtil.defaultEDTPollPeriod;
public DefaultEDTUtil(final ThreadGroup tg, final String name, final Runnable dispatchMessages) {
this.threadGroup = tg;
this.name=Thread.currentThread().getName()+"-"+name+"-EDT-";
this.dispatchMessages=dispatchMessages;
this.edt = new NEDT(threadGroup, this.name);
this.edt.setDaemon(true); // don't stop JVM from shutdown ..
}
@Override
final public long getPollPeriod() {
return pollPeriod;
}
@Override
final public void setPollPeriod(final long ms) {
pollPeriod = ms; // writing to static field is intended
}
@Override
public final void start() throws IllegalStateException {
synchronized(edtLock) {
if( edt.isRunning() ) {
throw new IllegalStateException("EDT still running and not subject to stop. Curr "+Thread.currentThread().getName()+", EDT "+edt.getName()+", isRunning "+edt.isRunning+", shouldStop "+edt.shouldStop);
}
if(DEBUG) {
if(edt.tasks.size()>0) {
System.err.println(Thread.currentThread()+": Default-EDT reset, remaining tasks: "+edt.tasks.size()+" - "+edt);
}
System.err.println(Thread.currentThread()+": Default-EDT reset - edt: "+edt);
}
if( edt.getState() != Thread.State.NEW ) {
if( null != threadGroup && threadGroup.isDestroyed() ) {
// best thing we can do is to use this thread's TG
threadGroup = Thread.currentThread().getThreadGroup();
}
edt = new NEDT(threadGroup, name);
edt.setDaemon(true); // don't stop JVM from shutdown ..
}
startImpl();
}
if( !edt.isRunning() ) {
throw new RuntimeException("EDT could not be started: "+edt);
}
}
private final void startImpl() {
if(edt.isAlive()) {
throw new RuntimeException("Default-EDT Thread.isAlive(): true, isRunning: "+edt.isRunning+", shouldStop "+edt.shouldStop+", edt: "+edt+", tasks: "+edt.tasks.size());
}
start_iter++;
edt.setName(name+start_iter);
if(DEBUG) {
System.err.println(Thread.currentThread()+": Default-EDT START - edt: "+edt);
}
edt.start();
}
@Override
public final boolean isCurrentThreadEDT() {
return edt == Thread.currentThread(); // EDT == NEDT
}
@Override
public final boolean isCurrentThreadNEDT() {
return edt == Thread.currentThread(); // EDT == NEDT
}
@Override
public final boolean isCurrentThreadEDTorNEDT() {
return edt == Thread.currentThread(); // EDT == NEDT
}
@Override
public final boolean isRunning() {
return edt.isRunning() ;
}
@Override
public final boolean invokeStop(final boolean wait, final Runnable task) {
if(DEBUG) {
System.err.println(Thread.currentThread()+": Default-EDT.invokeStop wait "+wait);
ExceptionUtils.dumpStack(System.err);
}
return invokeImpl(wait, task, true /* stop */, false /* provokeError */);
}
public final boolean invokeAndWaitError(final Runnable task) {
if(DEBUG) {
System.err.println(Thread.currentThread()+": Default-EDT.invokeAndWaitError");
ExceptionUtils.dumpStack(System.err);
}
return invokeImpl(true /* wait */, task, false /* stop */, true /* provokeError */);
}
@Override
public final boolean invoke(final boolean wait, final Runnable task) {
return invokeImpl(wait, task, false /* stop */, false /* provokeError */);
}
private static Runnable nullTask = new Runnable() {
@Override
public void run() { }
};
private final boolean invokeImpl(boolean wait, Runnable task, final boolean stop, final boolean provokeError) {
final RunnableTask rTask;
final Object rTaskLock = new Object();
synchronized(rTaskLock) { // lock the optional task execution
synchronized(edtLock) { // lock the EDT status
if( edt.shouldStop ) {
// drop task ..
System.err.println(Thread.currentThread()+": Warning: Default-EDT about (1) to stop, won't enqueue new task: "+edt);
if(DEBUG) {
ExceptionUtils.dumpStack(System.err);
}
return false;
}
if( isCurrentThreadEDT() ) {
if(null != task) {
task.run();
}
wait = false; // running in same thread (EDT) -> no wait
rTask = null;
if( stop ) {
edt.shouldStop = true;
if( edt.tasks.size()>0 ) {
System.err.println(Thread.currentThread()+": Warning: Default-EDT about (2) to stop, task executed. Remaining tasks: "+edt.tasks.size()+" - "+edt);
if(DEBUG) {
ExceptionUtils.dumpStack(System.err);
}
}
}
} else {
if( !edt.isRunning ) {
if( null != task ) {
if( stop ) {
System.err.println(Thread.currentThread()+": Warning: Default-EDT is about (3) to stop and stopped already, dropping task. Remaining tasks: "+edt.tasks.size()+" - "+edt);
} else {
System.err.println(Thread.currentThread()+": Warning: Default-EDT is not running, dropping task. NEDT "+edt);
}
if(DEBUG) {
ExceptionUtils.dumpStack(System.err);
}
}
return false;
} else if( stop && null == task ) {
task = nullTask; // ensures execution triggering stop
}
if(null != task) {
synchronized(edt.tasks) {
rTask = new RunnableTask(task,
wait ? rTaskLock : null,
true /* always catch and report Exceptions, don't disturb EDT */,
wait ? null : System.err);
if(stop) {
rTask.setAttachment(TASK_ATTACHMENT_STOP); // mark final task, will imply shouldStop:=true
} else if(provokeError) {
rTask.setAttachment(TASK_ATTACHMENT_TEST_ERROR);
}
// append task ..
edt.tasks.add(rTask);
edt.tasks.notifyAll();
}
} else {
wait = false;
rTask = null;
}
}
}
if( wait ) {
try {
while( rTask.isInQueue() ) {
rTaskLock.wait(); // free lock, allow execution of rTask
}
} catch (final InterruptedException ie) {
throw new InterruptedRuntimeException(ie);
}
final Throwable throwable = rTask.getThrowable();
if(null!=throwable) {
if(throwable instanceof NativeWindowException) {
throw (NativeWindowException)throwable;
}
throw new RuntimeException(throwable);
}
}
if(DEBUG) {
if( stop) {
System.err.println(Thread.currentThread()+": Default-EDT signal STOP X edt: "+edt);
}
}
return true;
}
}
@Override
final public boolean waitUntilIdle() {
final NEDT _edt;
synchronized(edtLock) {
_edt = edt;
}
if(!_edt.isRunning || _edt == Thread.currentThread()) {
return false;
}
synchronized(_edt.tasks) {
try {
while(_edt.isRunning && _edt.tasks.size()>0) {
_edt.tasks.notifyAll();
_edt.tasks.wait();
}
} catch (final InterruptedException e) {
throw new InterruptedRuntimeException(e);
}
return true;
}
}
@Override
final public boolean waitUntilStopped() {
synchronized(edtLock) {
if(edt.isRunning && edt != Thread.currentThread() ) {
try {
while( edt.isRunning ) {
edtLock.wait();
}
} catch (final InterruptedException e) {
throw new InterruptedRuntimeException(e);
}
return true;
} else {
return false;
}
}
}
class NEDT extends InterruptSource.Thread {
volatile boolean shouldStop = false;
volatile boolean isRunning = false;
final ArrayList tasks = new ArrayList(); // one shot tasks
public NEDT(final ThreadGroup tg, final String name) {
super(tg, null, name);
}
final public boolean isRunning() {
return isRunning && !shouldStop;
}
@Override
final public void start() throws IllegalThreadStateException {
isRunning = true;
super.start();
}
private final void validateNoRecursiveLocksHold() {
if(LockDebugUtil.getRecursiveLockTrace().size()>0) {
LockDebugUtil.dumpRecursiveLockTrace(System.err);
throw new InternalError("XXX");
}
}
/**
* Utilizing locking only on tasks and its execution,
* not for event dispatching.
*/
@Override
final public void run() {
if(DEBUG) {
System.err.println(getName()+": Default-EDT run() START "+ getName());
}
if(Lock.DEBUG) {
validateNoRecursiveLocksHold();
}
RuntimeException error = null;
try {
do {
// event dispatch
if(!shouldStop) {
dispatchMessages.run();
}
// wait and work on tasks
RunnableTask task = null;
synchronized(tasks) {
// wait for tasks
if( !shouldStop && tasks.size()==0 ) {
try {
tasks.wait(pollPeriod);
} catch (final InterruptedException e) {
throw new InterruptedRuntimeException(e);
}
}
// execute one task, if available
if(tasks.size()>0) {
task = tasks.remove(0);
tasks.notifyAll();
final Object attachment = task.getAttachment();
if( TASK_ATTACHMENT_STOP == attachment ) {
shouldStop = true;
} else if( TASK_ATTACHMENT_TEST_ERROR == attachment ) {
tasks.add(0, task);
task = null;
throw new RuntimeException("TASK_ATTACHMENT_TEST_ERROR");
}
}
}
if(null!=task) {
task.run();
if(Lock.DEBUG) {
validateNoRecursiveLocksHold();
}
if(!task.hasWaiter() && null != task.getThrowable()) {
// at least dump stack-trace in case nobody waits for result
System.err.println("DefaultEDT.run(): Caught exception occured on thread "+java.lang.Thread.currentThread().getName()+": "+task.toString());
task.getThrowable().printStackTrace();
}
}
} while(!shouldStop) ;
} catch (final Throwable t) {
// handle errors ..
shouldStop = true;
if(t instanceof RuntimeException) {
error = (RuntimeException) t;
} else {
error = new RuntimeException("Within Default-EDT", t);
}
} finally {
final String msg = getName()+": Default-EDT finished w/ "+tasks.size()+" left";
if(DEBUG) {
System.err.println(msg+", "+error);
}
synchronized(edtLock) {
int i = 0;
while( tasks.size() > 0 ) {
// notify all waiter
final String msg2 = msg+", task #"+i;
final Throwable t = null != error ? new Throwable(msg2, error) : new Throwable(msg2);
final RunnableTask rt = tasks.remove(0);
if( null != rt ) {
rt.flush(t);
i++;
}
}
isRunning = false;
edtLock.notifyAll();
}
if(DEBUG) {
System.err.println(msg+" EXIT, exception: "+error);
}
if(null!=error) {
throw error;
}
} // finally
} // run()
} // EventDispatchThread
}