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54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
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#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
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#include "base/base_export.h"
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#include "base/callback.h"
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#include "base/macros.h"
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#include "base/memory/memory_pressure_listener.h"
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namespace base {
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// TODO(chrisha): Make this a concrete class with per-OS implementations rather
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// than an abstract base class.
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// Declares the interface for a MemoryPressureMonitor. There are multiple
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// OS specific implementations of this class. An instance of the memory
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// pressure observer is created at the process level, tracks memory usage, and
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// pushes memory state change notifications to the static function
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// base::MemoryPressureListener::NotifyMemoryPressure. This is turn notifies
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// all MemoryPressureListener instances via a callback.
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class BASE_EXPORT MemoryPressureMonitor {
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public:
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using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
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using DispatchCallback = base::Callback<void(MemoryPressureLevel level)>;
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virtual ~MemoryPressureMonitor();
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// Return the singleton MemoryPressureMonitor.
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static MemoryPressureMonitor* Get();
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// Record memory pressure UMA statistic. A tick is 5 seconds.
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static void RecordMemoryPressure(MemoryPressureLevel level, int ticks);
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// Returns the currently observed memory pressure.
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virtual MemoryPressureLevel GetCurrentPressureLevel() = 0;
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// Sets a notification callback. The default callback invokes
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// base::MemoryPressureListener::NotifyMemoryPressure.
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virtual void SetDispatchCallback(const DispatchCallback& callback) = 0;
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protected:
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MemoryPressureMonitor();
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private:
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DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
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};
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} // namespace base
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#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
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