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      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 
     24 namespace android {
     25 namespace uirenderer {
     26 
     27 template<typename T>
     28 class Future: public LightRefBase<Future<T> > {
     29 public:
     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 
     50 private:
     51     Barrier mBarrier;
     52     T mResult;
     53 };
     54 
     55 }; // namespace uirenderer
     56 }; // namespace android
     57 
     58 #endif // ANDROID_HWUI_FUTURE_H
     59