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/*
* Copyright (C) 2010 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.gallery3d.util;
import java.util.concurrent.Callable;
// NOTE: If the Callable throws any Throwable, the result value will be null.
public class FutureTask<T> implements Runnable, Future<T> {
private static final String TAG = "FutureTask";
private Callable<T> mCallable;
private FutureListener<T> mListener;
private volatile boolean mIsCancelled;
private boolean mIsDone;
private T mResult;
public FutureTask(Callable<T> callable, FutureListener<T> listener) {
mCallable = callable;
mListener = listener;
}
public FutureTask(Callable<T> callable) {
this(callable, null);
}
public void cancel() {
mIsCancelled = true;
}
public synchronized T get() {
while (!mIsDone) {
try {
wait();
} catch (InterruptedException t) {
// ignore.
}
}
return mResult;
}
public void waitDone() {
get();
}
public synchronized boolean isDone() {
return mIsDone;
}
public boolean isCancelled() {
return mIsCancelled;
}
public void run() {
T result = null;
if (!mIsCancelled) {
try {
result = mCallable.call();
} catch (Throwable ex) {
Log.w(TAG, "Exception in running a task", ex);
}
}
synchronized(this) {
mResult = result;
mIsDone = true;
if (mListener != null) {
mListener.onFutureDone(this);
}
notifyAll();
}
}
}
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