1 // Copyright 2015 Google Inc. All rights reserved
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //      http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef STATS_H_
16 #define STATS_H_
17 
18 #include <mutex>
19 #include <string>
20 
21 using namespace std;
22 
23 class Stats {
24  public:
25   explicit Stats(const char* name);
26 
27   string String() const;
28 
29  private:
30   void Start();
31   double End();
32 
33   friend class ScopedStatsRecorder;
34 
35   const char* name_;
36   double elapsed_;
37   int cnt_;
38   mutable mutex mu_;
39 };
40 
41 class ScopedStatsRecorder {
42  public:
43   explicit ScopedStatsRecorder(Stats* st, const char* msg = 0);
44   ~ScopedStatsRecorder();
45 
46  private:
47   Stats* st_;
48   const char* msg_;
49 };
50 
51 void ReportAllStats();
52 
53 #define COLLECT_STATS(name)                     \
54   static Stats stats(name);                     \
55   ScopedStatsRecorder ssr(&stats)
56 
57 #define COLLECT_STATS_WITH_SLOW_REPORT(name, msg)       \
58   static Stats stats(name);                             \
59   ScopedStatsRecorder ssr(&stats, msg)
60 
61 #endif  // STATS_H_
62