1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_HWUI_FUTURE_H 18#define ANDROID_HWUI_FUTURE_H 19 20#include <utils/RefBase.h> 21 22#include "Barrier.h" 23 24namespace android { 25namespace uirenderer { 26 27template<typename T> 28class Future: public LightRefBase<Future<T> > { 29public: 30 Future(Condition::WakeUpType type = Condition::WAKE_UP_ONE): mBarrier(type), mResult() { } 31 ~Future() { } 32 33 /** 34 * Returns the result of this future, blocking if 35 * the result is not available yet. 36 */ 37 T get() const { 38 mBarrier.wait(); 39 return mResult; 40 } 41 42 /** 43 * This method must be called only once. 44 */ 45 void produce(T result) { 46 mResult = result; 47 mBarrier.open(); 48 } 49 50private: 51 Barrier mBarrier; 52 T mResult; 53}; 54 55}; // namespace uirenderer 56}; // namespace android 57 58#endif // ANDROID_HWUI_FUTURE_H 59