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// Copyright 2013 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 BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_
#define BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_
#include "base/base_export.h"
#include "base/debug/trace_event_impl.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/process/process_metrics.h"
#include "base/timer/timer.h"
namespace base {
class SingleThreadTaskRunner;
namespace debug {
// Watches for chrome://tracing to be enabled or disabled. When tracing is
// enabled, also enables system events profiling. This class is the preferred
// way to turn system tracing on and off.
class BASE_EXPORT TraceEventSystemStatsMonitor
: public TraceLog::EnabledStateObserver {
public:
// Length of time interval between stat profiles.
static const int kSamplingIntervalMilliseconds = 2000;
// |task_runner| must be the primary thread for the client
// process, e.g. the UI thread in a browser.
explicit TraceEventSystemStatsMonitor(
scoped_refptr<SingleThreadTaskRunner> task_runner);
virtual ~TraceEventSystemStatsMonitor();
// base::debug::TraceLog::EnabledStateChangedObserver overrides:
virtual void OnTraceLogEnabled() OVERRIDE;
virtual void OnTraceLogDisabled() OVERRIDE;
// Retrieves system profiling at the current time.
void DumpSystemStats();
private:
FRIEND_TEST_ALL_PREFIXES(TraceSystemStatsMonitorTest,
TraceEventSystemStatsMonitor);
bool IsTimerRunningForTest() const;
void StartProfiling();
void StopProfiling();
// Ensures the observer starts and stops tracing on the primary thread.
scoped_refptr<SingleThreadTaskRunner> task_runner_;
// Timer to schedule system profile dumps.
RepeatingTimer<TraceEventSystemStatsMonitor> dump_timer_;
WeakPtrFactory<TraceEventSystemStatsMonitor> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(TraceEventSystemStatsMonitor);
};
// Converts system memory profiling stats in |input| to
// trace event compatible JSON and appends to |output|. Visible for testing.
BASE_EXPORT void AppendSystemProfileAsTraceFormat(const SystemMetrics&
system_stats,
std::string* output);
} // namespace debug
} // namespace base
#endif // BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_
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