73 lines
2.2 KiB
Java
73 lines
2.2 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin.utils;
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import android.util.Log;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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/**
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* This class is a holder of the result of an asynchronous computation.
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*
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* @param <E> the type of the result.
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*/
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public class AsyncResultHolder<E> {
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private final Object mLock = new Object();
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private E mResult;
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private final String mTag;
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private final CountDownLatch mLatch;
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public AsyncResultHolder(final String tag) {
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mTag = tag;
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mLatch = new CountDownLatch(1);
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}
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/**
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* Sets the result value of this holder.
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*
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* @param result the value to set.
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*/
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public void set(final E result) {
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synchronized(mLock) {
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if (mLatch.getCount() > 0) {
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mResult = result;
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mLatch.countDown();
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}
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}
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}
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/**
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* Gets the result value held in this holder.
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* Causes the current thread to wait unless the value is set or the specified time is elapsed.
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*
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* @param defaultValue the default value.
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* @param timeOut the maximum time to wait.
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* @return if the result is set before the time limit then the result, otherwise defaultValue.
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*/
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public E get(final E defaultValue, final long timeOut) {
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try {
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return mLatch.await(timeOut, TimeUnit.MILLISECONDS) ? mResult : defaultValue;
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} catch (InterruptedException e) {
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Log.w(mTag, "get() : Interrupted after " + timeOut + " ms");
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return defaultValue;
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}
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}
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}
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