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 
25 namespace android {
26 
27 struct AMessage;
28 
29 struct AHandler : public RefBase {
AHandlerAHandler30     AHandler()
31         : mID(0),
32           mVerboseStats(false),
33           mMessageCounter(0) {
34     }
35 
idAHandler36     ALooper::handler_id id() const {
37         return mID;
38     }
39 
looperAHandler40     sp<ALooper> looper() const {
41         return mLooper.promote();
42     }
43 
getLooperAHandler44     wp<ALooper> getLooper() const {
45         return mLooper;
46     }
47 
getHandlerAHandler48     wp<AHandler> getHandler() const {
49         // allow getting a weak reference to a const handler
50         return const_cast<AHandler *>(this);
51     }
52 
53 protected:
54     virtual void onMessageReceived(const sp<AMessage> &msg) = 0;
55 
56 private:
57     friend struct AMessage;      // deliverMessage()
58     friend struct ALooperRoster; // setID()
59 
60     ALooper::handler_id mID;
61     wp<ALooper> mLooper;
62 
setIDAHandler63     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