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// Copyright 2015 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_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
#include <CoreFoundation/CFDate.h>
#include <dispatch/dispatch.h>
#include "base/base_export.h"
#include "base/mac/scoped_dispatch_object.h"
#include "base/macros.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/memory_pressure_monitor.h"
namespace base {
namespace mac {
class TestMemoryPressureMonitor;
// Declares the interface for the Mac MemoryPressureMonitor, which reports
// memory pressure events and status.
class BASE_EXPORT MemoryPressureMonitor : public base::MemoryPressureMonitor {
public:
MemoryPressureMonitor();
~MemoryPressureMonitor() override;
// Returns the currently-observed memory pressure.
MemoryPressureLevel GetCurrentPressureLevel() override;
void SetDispatchCallback(const DispatchCallback& callback) override;
private:
friend TestMemoryPressureMonitor;
static MemoryPressureLevel
MemoryPressureLevelForMacMemoryPressure(int mac_memory_pressure);
void OnMemoryPressureChanged(dispatch_source_s* event_source,
const DispatchCallback& dispatch_callback);
void SendStatisticsIfNecessary(bool pressure_level_changed);
ScopedDispatchObject<dispatch_source_t> memory_level_event_source_;
DispatchCallback dispatch_callback_;
CFTimeInterval last_statistic_report_;
MemoryPressureLevel last_pressure_level_;
// The UMA statistic is recorded in 5 second increments. This
// accumulates the remaining time to be rolled into the next
// call.
CFTimeInterval reporting_error_;
DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
};
} // namespace mac
} // namespace base
#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
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