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:
TaskProcessorBase()30     TaskProcessorBase() { }
~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:
TaskProcessor(TaskManager * manager)39     TaskProcessor(TaskManager* manager): mManager(manager) { }
~TaskProcessor()40     virtual ~TaskProcessor() { }
41 
add(const sp<Task<T>> & task)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 
process(const sp<TaskBase> & task)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>
addImpl(const sp<Task<T>> & task)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