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57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
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// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_AUTO_OPEN_CLOSE_EVENT_H_
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#define BASE_AUTO_OPEN_CLOSE_EVENT_H_
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#include "base/macros.h"
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#include "base/memory/weak_ptr.h"
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#include "base/threading/thread_checker.h"
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#include "base/time/time.h"
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#include "base/trace_event/trace_event.h"
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namespace base {
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namespace trace_event {
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// Class for tracing events that support "auto-opening" and "auto-closing".
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// "auto-opening" = if the trace event is started (call Begin() before
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// tracing is started,the trace event will be opened, with the start time
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// being the time that the trace event was actually started.
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// "auto-closing" = if the trace event is started but not ended by the time
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// tracing ends, then the trace event will be automatically closed at the
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// end of tracing.
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class BASE_EXPORT AutoOpenCloseEvent
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: public TraceLog::AsyncEnabledStateObserver {
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public:
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enum Type {
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ASYNC
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};
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// As in the rest of the tracing macros, the const char* arguments here
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// must be pointers to indefinitely lived strings (e.g. hard-coded string
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// literals are okay, but not strings created by c_str())
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AutoOpenCloseEvent(Type type, const char* category, const char* event_name);
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~AutoOpenCloseEvent() override;
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void Begin();
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void End();
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// AsyncEnabledStateObserver implementation
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void OnTraceLogEnabled() override;
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void OnTraceLogDisabled() override;
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private:
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const char* const category_;
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const char* const event_name_;
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base::TimeTicks start_time_;
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base::ThreadChecker thread_checker_;
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WeakPtrFactory<AutoOpenCloseEvent> weak_factory_;
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DISALLOW_COPY_AND_ASSIGN(AutoOpenCloseEvent);
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};
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} // namespace trace_event
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} // namespace base
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#endif // BASE_AUTO_OPEN_CLOSE_EVENT_H_
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