components/memory_pressure/memory_pressure_calculator.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_MEMORY_PRESSURE_MEMORY_PRESSURE_CALCULATOR_H_
   6 #define COMPONENTS_MEMORY_PRESSURE_MEMORY_PRESSURE_CALCULATOR_H_
   7
   8 #include "components/memory_pressure/memory_pressure_listener.h"
   9
  10 namespace memory_pressure {
  11
  12 #if defined(MEMORY_PRESSURE_IS_POLLING)
  13
  14 // Interface for a utility class that calculates memory pressure. Only used on
  15 // platforms without native memory pressure signals.
  16 class MemoryPressureCalculator {
  17  public:
  18   using MemoryPressureLevel = MemoryPressureListener::MemoryPressureLevel;
  19
  20   MemoryPressureCalculator() {}
  21   virtual ~MemoryPressureCalculator() {}
  22   virtual MemoryPressureLevel CalculateCurrentPressureLevel() = 0;
  23
  24  private:
  25   DISALLOW_COPY_AND_ASSIGN(MemoryPressureCalculator);
  26 };
  27
  28 #endif  // defined(MEMORY_PRESSURE_IS_POLLING)
  29
  30 }  // namespace memory_pressure
  31
  32 #endif  // COMPONENTS_MEMORY_PRESSURE_MEMORY_PRESSURE_CALCULATOR_H_