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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_
#define CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_
#include "base/bind.h"
#include "base/memory/ref_counted_memory.h"
#include "base/threading/thread.h"
#include "base/values.h"
#include "base/win/event_trace_consumer.h"
#include "base/win/event_trace_controller.h"
template <typename Type>
struct DefaultSingletonTraits;
namespace content {
class EtwSystemEventConsumer :
public base::win::EtwTraceConsumerBase<EtwSystemEventConsumer> {
public:
typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&)>
OutputCallback;
bool StartSystemTracing();
void StopSystemTracing(const OutputCallback& callback);
// Retrieve the ETW consumer instance.
static EtwSystemEventConsumer* GetInstance();
private:
// This allows constructor and destructor to be private and usable only
// by the Singleton class.
friend struct DefaultSingletonTraits<EtwSystemEventConsumer>;
// Constructor.
EtwSystemEventConsumer();
virtual ~EtwSystemEventConsumer();
void AddSyncEventToBuffer();
void AppendEventToBuffer(EVENT_TRACE* event);
// Static override of EtwTraceConsumerBase::ProcessEvent.
// @param event the raw ETW event to process.
friend class base::win::EtwTraceConsumerBase<EtwSystemEventConsumer>;
static void ProcessEvent(EVENT_TRACE* event);
// Request the ETW trace controller to activate the kernel tracing.
// returns true on success, false if the kernel tracing isn't activated.
bool StartKernelSessionTracing();
// Request the ETW trace controller to deactivate the kernel tracing.
// @param callback the callback to call with the consumed events.
// @returns true on success, false if an error occurred.
bool StopKernelSessionTracing();
void OnStopSystemTracingDone(
const OutputCallback& callback,
const scoped_refptr<base::RefCountedString>& result);
void TraceAndConsumeOnThread();
void FlushOnThread(const OutputCallback& callback);
scoped_ptr<base::ListValue> events_;
base::Thread thread_;
TRACEHANDLE session_handle_;
base::win::EtwTraceProperties properties_;
DISALLOW_COPY_AND_ASSIGN(EtwSystemEventConsumer);
};
} // namespace content
#endif // CONTENT_BROWSER_TRACING_TRACING_CONSUMER_WIN_H_
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