AHandler.h revision e2b43843fd12783188edd2c54188ea8d26864788 
1/*
2 * Copyright (C) 2010 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 A_HANDLER_H_
18
19#define A_HANDLER_H_
20
21#include <media/stagefright/foundation/ALooper.h>
22#include <utils/KeyedVector.h>
23#include <utils/RefBase.h>
24
25namespace android {
26
27struct AMessage;
28
29struct AHandler : public RefBase {
30    AHandler()
31        : mID(0),
32          mVerboseStats(false),
33          mMessageCounter(0) {
34    }
35
36    ALooper::handler_id id() const {
37        return mID;
38    }
39
40    sp<ALooper> looper() const {
41        return mLooper.promote();
42    }
43
44    wp<ALooper> getLooper() const {
45        return mLooper;
46    }
47
48    wp<AHandler> getHandler() const {
49        // allow getting a weak reference to a const handler
50        return const_cast<AHandler *>(this);
51    }
52
53protected:
54    virtual void onMessageReceived(const sp<AMessage> &msg) = 0;
55
56private:
57    friend struct AMessage;      // deliverMessage()
58    friend struct ALooperRoster; // setID()
59
60    ALooper::handler_id mID;
61    wp<ALooper> mLooper;
62
63    inline void setID(ALooper::handler_id id, const wp<ALooper> &looper) {
64        mID = id;
65        mLooper = looper;
66    }
67
68    bool mVerboseStats;
69    uint32_t mMessageCounter;
70    KeyedVector<uint32_t, uint32_t> mMessages;
71
72    void deliverMessage(const sp<AMessage> &msg);
73
74    DISALLOW_EVIL_CONSTRUCTORS(AHandler);
75};
76
77}  // namespace android
78
79#endif  // A_HANDLER_H_
80