TaskProcessor.h revision faecb78a6b11c780db47bc940ca7662899ab5d5e 
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
25namespace android {
26namespace uirenderer {
27
28class TaskProcessorBase: public RefBase {
29public:
30    TaskProcessorBase() { }
31    virtual ~TaskProcessorBase() { };
32
33    virtual void process(const sp<TaskBase>& task) = 0;
34};
35
36template<typename T>
37class TaskProcessor: public TaskProcessorBase {
38public:
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
51private:
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
64template<typename T>
65bool 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