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_MEDIA_LOG_SERVICE_H
18 #define ANDROID_MEDIA_LOG_SERVICE_H
19 
20 #include <binder/BinderService.h>
21 #include <media/IMediaLogService.h>
22 #include <media/nbaio/NBLog.h>
23 
24 namespace android {
25 
26 class MediaLogService : public BinderService<MediaLogService>, public BnMediaLogService
27 {
28     friend class BinderService<MediaLogService>;    // for MediaLogService()
29 public:
MediaLogService()30     MediaLogService() : BnMediaLogService() { }
~MediaLogService()31     virtual ~MediaLogService() { }
onFirstRef()32     virtual void onFirstRef() { }
33 
getServiceName()34     static const char*  getServiceName() { return "media.log"; }
35 
36     static const size_t kMinSize = 0x100;
37     static const size_t kMaxSize = 0x10000;
38     virtual void        registerWriter(const sp<IMemory>& shared, size_t size, const char *name);
39     virtual void        unregisterWriter(const sp<IMemory>& shared);
40 
41     virtual status_t    dump(int fd, const Vector<String16>& args);
42     virtual status_t    onTransact(uint32_t code, const Parcel& data, Parcel* reply,
43                                 uint32_t flags);
44 
45 private:
46 
47     // Internal dump
48     static const int kDumpLockRetries = 50;
49     static const int kDumpLockSleepUs = 20000;
50     static bool dumpTryLock(Mutex& mutex);
51 
52     Mutex               mLock;
53     class NamedReader {
54     public:
NamedReader()55         NamedReader() : mReader(0) { mName[0] = '\0'; } // for Vector
NamedReader(const sp<NBLog::Reader> & reader,const char * name)56         NamedReader(const sp<NBLog::Reader>& reader, const char *name) : mReader(reader)
57             { strlcpy(mName, name, sizeof(mName)); }
~NamedReader()58         ~NamedReader() { }
reader()59         const sp<NBLog::Reader>&  reader() const { return mReader; }
name()60         const char*               name() const { return mName; }
61     private:
62         sp<NBLog::Reader>   mReader;
63         static const size_t kMaxName = 32;
64         char                mName[kMaxName];
65     };
66     Vector<NamedReader> mNamedReaders;
67 };
68 
69 }   // namespace android
70 
71 #endif  // ANDROID_MEDIA_LOG_SERVICE_H
72