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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 |
| 51 DISALLOW_COPY_AND_ASSIGN(AutoOpenCloseEvent); |
| 52 }; |
| 53 |
| 54 } // namespace trace_event |
| 55 } // namespace base |
| 56 |
| 57 #endif // BASE_AUTO_OPEN_CLOSE_EVENT_H_ |
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