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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.android.ex.camera2.portability;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.SystemClock;
import com.android.ex.camera2.portability.debug.Log;
import java.util.LinkedList;
import java.util.Queue;
public class DispatchThread extends Thread {
private static final Log.Tag TAG = new Log.Tag("DispatchThread");
private static final long MAX_MESSAGE_QUEUE_LENGTH = 256;
private final Queue<Runnable> mJobQueue;
private Boolean mIsEnded;
private Handler mCameraHandler;
private HandlerThread mCameraHandlerThread;
public DispatchThread(Handler cameraHandler, HandlerThread cameraHandlerThread) {
super("Camera Job Dispatch Thread");
mJobQueue = new LinkedList<Runnable>();
mIsEnded = new Boolean(false);
mCameraHandler = cameraHandler;
mCameraHandlerThread = cameraHandlerThread;
}
/**
* Queues up the job.
*
* @param job The job to run.
*/
public void runJob(Runnable job) {
if (isEnded()) {
throw new IllegalStateException(
"Trying to run job on interrupted dispatcher thread");
}
synchronized (mJobQueue) {
if (mJobQueue.size() == MAX_MESSAGE_QUEUE_LENGTH) {
throw new RuntimeException("Camera master thread job queue full");
}
mJobQueue.add(job);
mJobQueue.notifyAll();
}
}
/**
* Queues up the job and wait for it to be done.
*
* @param job The job to run.
* @param timeoutMs Timeout limit in milliseconds.
* @param jobMsg The message to log when the job runs timeout.
* @return Whether the job finishes before timeout.
*/
public void runJobSync(final Runnable job, Object waitLock, long timeoutMs, String jobMsg) {
String timeoutMsg = "Timeout waiting " + timeoutMs + "ms for " + jobMsg;
synchronized (waitLock) {
long timeoutBound = SystemClock.uptimeMillis() + timeoutMs;
try {
runJob(job);
waitLock.wait(timeoutMs);
if (SystemClock.uptimeMillis() > timeoutBound) {
throw new IllegalStateException(timeoutMsg);
}
} catch (InterruptedException ex) {
if (SystemClock.uptimeMillis() > timeoutBound) {
throw new IllegalStateException(timeoutMsg);
}
}
}
}
/**
* Gracefully ends this thread. Will stop after all jobs are processed.
*/
public void end() {
synchronized (mIsEnded) {
mIsEnded = true;
}
synchronized(mJobQueue) {
mJobQueue.notifyAll();
}
}
private boolean isEnded() {
synchronized (mIsEnded) {
return mIsEnded;
}
}
@Override
public void run() {
while(true) {
Runnable job = null;
synchronized (mJobQueue) {
while (mJobQueue.size() == 0 && !isEnded()) {
try {
mJobQueue.wait();
} catch (InterruptedException ex) {
Log.w(TAG, "Dispatcher thread wait() interrupted, exiting");
break;
}
}
job = mJobQueue.poll();
}
if (job == null) {
// mJobQueue.poll() returning null means wait() is
// interrupted and the queue is empty.
if (isEnded()) {
break;
}
continue;
}
job.run();
synchronized (DispatchThread.this) {
mCameraHandler.post(new Runnable() {
@Override
public void run() {
synchronized (DispatchThread.this) {
DispatchThread.this.notifyAll();
}
}
});
try {
DispatchThread.this.wait();
} catch (InterruptedException ex) {
// TODO: do something here.
}
}
}
mCameraHandlerThread.quitSafely();
}
}
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