/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.utils;
/** A pausable thread. The runnable must not execute an inifite loop but should return control to the thread as often as possible
* so that the thread can actually pause.
*
* @author mzechner */
public class PauseableThread extends Thread {
final Runnable runnable;
boolean paused = false;
boolean exit = false;
/** Constructs a new thread setting the runnable which will be called repeatedly in a loop.
*
* @param runnable the runnable. */
public PauseableThread (Runnable runnable) {
this.runnable = runnable;
}
public void run () {
while (true) {
synchronized (this) {
try {
while (paused)
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (exit) return;
runnable.run();
}
}
/** Pauses the thread. This call is non-blocking */
public void onPause () {
paused = true;
}
/** Resumes the thread. This call is non-blocking */
public void onResume () {
synchronized (this) {
paused = false;
this.notifyAll();
}
}
/** @return whether this thread is paused or not */
public boolean isPaused () {
return paused;
}
/** Stops this thread */
public void stopThread () {
exit = true;
if (paused) onResume();
}
}