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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef BASE_AUTO_OPEN_CLOSE_EVENT_H_ | |
6 #define BASE_AUTO_OPEN_CLOSE_EVENT_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/weak_ptr.h" | |
10 #include "base/threading/thread_checker.h" | |
11 #include "base/time/time.h" | |
12 #include "base/trace_event/trace_event.h" | |
13 | |
14 namespace base { | |
15 namespace trace_event { | |
16 | |
17 // Class for tracing events that support "auto-opening" and "auto-closing". | |
18 // "auto-opening" = if the trace event is started (call Begin() before | |
19 // tracing is started,the trace event will be opened, with the start time | |
20 // being the time that the trace event was actually started. | |
21 // "auto-closing" = if the trace event is started but not ended by the time | |
22 // tracing ends, then the trace event will be automatically closed at the | |
23 // end of tracing. | |
24 class BASE_EXPORT AutoOpenCloseEvent | |
25 : public TraceLog::AsyncEnabledStateObserver { | |
26 public: | |
27 enum Type { | |
28 ASYNC | |
29 }; | |
30 | |
31 // As in the rest of the tracing macros, the const char* arguments here | |
32 // must be pointers to indefinitely lived strings (e.g. hard-coded string | |
33 // literals are okay, but not strings created by c_str()) | |
34 AutoOpenCloseEvent(Type type, const char* category, const char* event_name); | |
35 ~AutoOpenCloseEvent() override; | |
36 | |
37 void Begin(); | |
38 void End(); | |
39 | |
40 // AsyncEnabledStateObserver implementation | |
41 void OnTraceLogEnabled() override; | |
42 void OnTraceLogDisabled() override; | |
43 | |
44 private: | |
45 const char* const category_; | |
46 const char* const event_name_; | |
47 base::TimeTicks start_time_; | |
48 base::ThreadChecker thread_checker_; | |
49 WeakPtrFactory<AutoOpenCloseEvent> weak_factory_; | |
50 DISALLOW_COPY_AND_ASSIGN(AutoOpenCloseEvent); | |
Primiano Tucci (use gerrit)
2016/10/12 16:36:50
nit: add a \n beween line 49 and 50
alexandermont
2016/10/13 19:15:53
Done
| |
51 }; | |
52 | |
53 } // namespace trace_event | |
54 } // namespace base | |
55 | |
56 #endif // BASE_AUTO_OPEN_CLOSE_EVENT_H_ | |
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