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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.
*/
#ifndef ANDROID_HWUI_FUTURE_H
#define ANDROID_HWUI_FUTURE_H
#include <utils/RefBase.h>
#include "Barrier.h"
namespace android {
namespace uirenderer {
template <typename T>
class Future : public LightRefBase<Future<T> > {
public:
explicit Future(Condition::WakeUpType type = Condition::WAKE_UP_ONE)
: mBarrier(type), mResult() {}
~Future() {}
/**
* Returns the result of this future, blocking if
* the result is not available yet.
*/
T get() const {
mBarrier.wait();
return mResult;
}
/**
* This method must be called only once.
*/
void produce(T result) {
mResult = result;
mBarrier.open();
}
private:
Barrier mBarrier;
T mResult;
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_FUTURE_H
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