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/*
* Copyright (C) 2009 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.quicksearchbox.util;
import android.util.Log;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
/**
* Executor that uses a single thread and an unbounded work queue.
*/
public class SingleThreadNamedTaskExecutor implements NamedTaskExecutor {
private static final boolean DBG = false;
private static final String TAG = "QSB.SingleThreadNamedTaskExecutor";
private final LinkedBlockingQueue<NamedTask> mQueue;
private final Thread mWorker;
private volatile boolean mClosed = false;
public SingleThreadNamedTaskExecutor(ThreadFactory threadFactory) {
mQueue = new LinkedBlockingQueue<NamedTask>();
mWorker = threadFactory.newThread(new Worker());
mWorker.start();
}
public void cancelPendingTasks() {
if (DBG) Log.d(TAG, "Cancelling " + mQueue.size() + " tasks: " + mWorker.getName());
if (mClosed) {
throw new IllegalStateException("cancelPendingTasks() after close()");
}
mQueue.clear();
}
public void close() {
mClosed = true;
mWorker.interrupt();
mQueue.clear();
}
public void execute(NamedTask task) {
if (mClosed) {
throw new IllegalStateException("execute() after close()");
}
mQueue.add(task);
}
private class Worker implements Runnable {
public void run() {
try {
loop();
} finally {
if (!mClosed) Log.w(TAG, "Worker exited before close");
}
}
private void loop() {
Thread currentThread = Thread.currentThread();
String threadName = currentThread.getName();
while (!mClosed) {
NamedTask task;
try {
task = mQueue.take();
} catch (InterruptedException ex) {
continue;
}
currentThread.setName(threadName + " " + task.getName());
try {
if (DBG) Log.d(TAG, "Running task " + task.getName());
task.run();
if (DBG) Log.d(TAG, "Task " + task.getName() + " complete");
} catch (RuntimeException ex) {
Log.e(TAG, "Task " + task.getName() + " failed", ex);
}
}
}
}
public static Factory<NamedTaskExecutor> factory(final ThreadFactory threadFactory) {
return new Factory<NamedTaskExecutor>() {
public NamedTaskExecutor create() {
return new SingleThreadNamedTaskExecutor(threadFactory);
}
};
}
}
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