1 // Copyright 2014 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 CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_ 6 #define CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_ 7 8 #include "base/bind.h" 9 #include "base/memory/ref_counted_memory.h" 10 #include "base/threading/thread.h" 11 #include "base/values.h" 12 #include "base/win/event_trace_consumer.h" 13 #include "base/win/event_trace_controller.h" 14 15 template <typename Type> 16 struct DefaultSingletonTraits; 17 18 namespace content { 19 20 class EtwSystemEventConsumer : 21 public base::win::EtwTraceConsumerBase<EtwSystemEventConsumer> { 22 public: 23 typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&)> 24 OutputCallback; 25 26 bool StartSystemTracing(); 27 void StopSystemTracing(const OutputCallback& callback); 28 29 // Retrieve the ETW consumer instance. 30 static EtwSystemEventConsumer* GetInstance(); 31 32 private: 33 // This allows constructor and destructor to be private and usable only 34 // by the Singleton class. 35 friend struct DefaultSingletonTraits<EtwSystemEventConsumer>; 36 37 // Constructor. 38 EtwSystemEventConsumer(); 39 virtual ~EtwSystemEventConsumer(); 40 41 void AddSyncEventToBuffer(); 42 void AppendEventToBuffer(EVENT_TRACE* event); 43 44 // Static override of EtwTraceConsumerBase::ProcessEvent. 45 // @param event the raw ETW event to process. 46 friend class base::win::EtwTraceConsumerBase<EtwSystemEventConsumer>; 47 static void ProcessEvent(EVENT_TRACE* event); 48 49 // Request the ETW trace controller to activate the kernel tracing. 50 // returns true on success, false if the kernel tracing isn't activated. 51 bool StartKernelSessionTracing(); 52 53 // Request the ETW trace controller to deactivate the kernel tracing. 54 // @param callback the callback to call with the consumed events. 55 // @returns true on success, false if an error occurred. 56 bool StopKernelSessionTracing(); 57 58 void OnStopSystemTracingDone( 59 const OutputCallback& callback, 60 const scoped_refptr<base::RefCountedString>& result); 61 62 void TraceAndConsumeOnThread(); 63 void FlushOnThread(const OutputCallback& callback); 64 65 scoped_ptr<base::ListValue> events_; 66 base::Thread thread_; 67 TRACEHANDLE session_handle_; 68 base::win::EtwTraceProperties properties_; 69 70 DISALLOW_COPY_AND_ASSIGN(EtwSystemEventConsumer); 71 }; 72 73 } // namespace content 74 75 #endif // CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_ 76
