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/nblog/Merger.h>
23 #include <media/nblog/NBLog.h>
24 
25 namespace android {
26 
27 class MediaLogService : public BinderService<MediaLogService>, public BnMediaLogService
28 {
29     friend class BinderService<MediaLogService>;    // for MediaLogService()
30 public:
31     MediaLogService();
32     virtual ~MediaLogService() override;
onFirstRef()33     virtual void onFirstRef() { }
34 
getServiceName()35     static const char*  getServiceName() { return "media.log"; }
36 
37     static const size_t kMinSize = 0x100;
38     static const size_t kMaxSize = 0x10000;
39     virtual void        registerWriter(const sp<IMemory>& shared, size_t size, const char *name);
40     virtual void        unregisterWriter(const sp<IMemory>& shared);
41 
42     virtual status_t    dump(int fd, const Vector<String16>& args);
43     virtual status_t    onTransact(uint32_t code, const Parcel& data, Parcel* reply,
44                                 uint32_t flags);
45 
46     virtual void        requestMergeWakeup() override;
47 
48 private:
49 
50     // Internal dump
51     static const int kDumpLockRetries = 50;
52     static const int kDumpLockSleepUs = 20000;
53     // Size of merge buffer, in bytes
54     static const size_t kMergeBufferSize = 64 * 1024; // TODO determine good value for this
55     static bool dumpTryLock(Mutex& mutex);
56 
57     Mutex               mLock;
58 
59     Vector<sp<NBLog::DumpReader>> mDumpReaders;   // protected by mLock
60 
61     // FIXME Need comments on all of these, especially about locking
62     NBLog::Shared *mMergerShared;
63     NBLog::Merger mMerger;
64     NBLog::MergeReader mMergeReader;
65     const sp<NBLog::MergeThread> mMergeThread;
66 };
67 
68 }   // namespace android
69 
70 #endif  // ANDROID_MEDIA_LOG_SERVICE_H
71