1 /*
2  * Copyright (C) 2021 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 #pragma once
18 
19 #include <map>
20 #include <mutex>
21 #include <sstream>
22 
23 #include <android-base/thread_annotations.h>
24 #include <audio_utils/SimpleLog.h>
25 
26 namespace android::mediametrics {
27 
28 class StatsdLog {
29 public:
StatsdLog(size_t lines)30     explicit StatsdLog(size_t lines) : mSimpleLog(lines) {}
31 
log(int atom,const std::string & string)32     void log(int atom, const std::string& string) {
33         {
34             std::lock_guard lock(mLock);
35             ++mCountMap[atom];
36         }
37         mSimpleLog.log("%s", string.c_str());
38     }
39 
40    std::string dumpToString(const char *prefix = "", size_t logLines = 0) const {
41        std::stringstream ss;
42 
43        {   // first print out the atom counts
44            std::lock_guard lock(mLock);
45 
46            size_t col = 0;
47            for (const auto& count : mCountMap) {
48                if (col == 8) {
49                    col = 0;
50                    ss << "\n" << prefix;
51                } else {
52                    ss << " ";
53                }
54                ss << "[ " << count.first << " : " << count.second << " ]";
55                ++col;
56            }
57            ss << "\n";
58        }
59 
60        // then print out the log lines
61        ss << mSimpleLog.dumpToString(prefix, logLines);
62        return ss.str();
63    }
64 
65 private:
66     mutable std::mutex mLock;
67     SimpleLog mSimpleLog; // internally locked
68     std::map<int /* atom */, size_t /* count */> mCountMap GUARDED_BY(mLock); // sorted
69 };
70 
71 } // namespace android::mediametrics
72