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/*
* Copyright (C) 2013 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.inputmethod.latin.utils;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* This class is a holder of the result of an asynchronous computation.
*
* @param <E> the type of the result.
*/
public class AsyncResultHolder<E> {
private final Object mLock = new Object();
private E mResult;
private final CountDownLatch mLatch;
public AsyncResultHolder() {
mLatch = new CountDownLatch(1);
}
/**
* Sets the result value of this holder.
*
* @param result the value to set.
*/
public void set(final E result) {
synchronized(mLock) {
if (mLatch.getCount() > 0) {
mResult = result;
mLatch.countDown();
}
}
}
/**
* Gets the result value held in this holder.
* Causes the current thread to wait unless the value is set or the specified time is elapsed.
*
* @param defaultValue the default value.
* @param timeOut the maximum time to wait.
* @return if the result is set before the time limit then the result, otherwise defaultValue.
*/
public E get(final E defaultValue, final long timeOut) {
try {
if (mLatch.await(timeOut, TimeUnit.MILLISECONDS)) {
return mResult;
} else {
return defaultValue;
}
} catch (InterruptedException e) {
return defaultValue;
}
}
}
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