mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 01:36:09 +03:00
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// 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_H_
|
|
#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/callback.h"
|
|
#include "base/macros.h"
|
|
#include "base/memory/memory_pressure_listener.h"
|
|
|
|
namespace base {
|
|
|
|
// TODO(chrisha): Make this a concrete class with per-OS implementations rather
|
|
// than an abstract base class.
|
|
|
|
// Declares the interface for a MemoryPressureMonitor. There are multiple
|
|
// OS specific implementations of this class. An instance of the memory
|
|
// pressure observer is created at the process level, tracks memory usage, and
|
|
// pushes memory state change notifications to the static function
|
|
// base::MemoryPressureListener::NotifyMemoryPressure. This is turn notifies
|
|
// all MemoryPressureListener instances via a callback.
|
|
class BASE_EXPORT MemoryPressureMonitor {
|
|
public:
|
|
using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
|
|
using DispatchCallback = base::Callback<void(MemoryPressureLevel level)>;
|
|
|
|
virtual ~MemoryPressureMonitor();
|
|
|
|
// Return the singleton MemoryPressureMonitor.
|
|
static MemoryPressureMonitor* Get();
|
|
|
|
// Record memory pressure UMA statistic. A tick is 5 seconds.
|
|
static void RecordMemoryPressure(MemoryPressureLevel level, int ticks);
|
|
|
|
// Returns the currently observed memory pressure.
|
|
virtual MemoryPressureLevel GetCurrentPressureLevel() = 0;
|
|
|
|
// Sets a notification callback. The default callback invokes
|
|
// base::MemoryPressureListener::NotifyMemoryPressure.
|
|
virtual void SetDispatchCallback(const DispatchCallback& callback) = 0;
|
|
|
|
protected:
|
|
MemoryPressureMonitor();
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
|