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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_TASK_PROCESSOR_H
     18 #define ANDROID_HWUI_TASK_PROCESSOR_H
     19 
     20 #include <utils/RefBase.h>
     21 
     22 #include "Task.h"
     23 #include "TaskManager.h"
     24 
     25 namespace android {
     26 namespace uirenderer {
     27 
     28 class TaskProcessorBase : public RefBase {
     29 public:
     30     TaskProcessorBase() {}
     31     virtual ~TaskProcessorBase(){};
     32 
     33     virtual void process(const sp<TaskBase>& task) = 0;
     34 };
     35 
     36 template <typename T>
     37 class TaskProcessor : public TaskProcessorBase {
     38 public:
     39     explicit TaskProcessor(TaskManager* manager) : mManager(manager) {}
     40     virtual ~TaskProcessor() {}
     41 
     42     void add(const sp<Task<T> >& task) {
     43         if (!addImpl(task)) {
     44             // fall back to immediate execution
     45             process(task);
     46         }
     47     }
     48 
     49     virtual void onProcess(const sp<Task<T> >& task) = 0;
     50 
     51 private:
     52     bool addImpl(const sp<Task<T> >& task);
     53 
     54     virtual void process(const sp<TaskBase>& task) override {
     55         sp<Task<T> > realTask = static_cast<Task<T>*>(task.get());
     56         // This is the right way to do it but sp<> doesn't play nice
     57         // sp<Task<T> > realTask = static_cast<sp<Task<T> > >(task);
     58         onProcess(realTask);
     59     }
     60 
     61     TaskManager* mManager;
     62 };
     63 
     64 template <typename T>
     65 bool TaskProcessor<T>::addImpl(const sp<Task<T> >& task) {
     66     if (mManager) {
     67         sp<TaskProcessor<T> > self(this);
     68         return mManager->addTask(task, self);
     69     }
     70     return false;
     71 }
     72 
     73 };  // namespace uirenderer
     74 };  // namespace android
     75 
     76 #endif  // ANDROID_HWUI_TASK_PROCESSOR_H
     77