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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 MemoryCoordinator_h
#define MemoryCoordinator_h
#include "platform/PlatformExport.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebMemoryPressureLevel.h"
#include "public/platform/WebMemoryState.h"
#include "wtf/Noncopyable.h"
namespace blink {
class PLATFORM_EXPORT MemoryCoordinatorClient : public GarbageCollectedMixin {
public:
virtual ~MemoryCoordinatorClient() {}
// TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
// gone.
virtual void onMemoryPressure(WebMemoryPressureLevel) {}
virtual void onMemoryStateChange(MemoryState) {}
};
// MemoryCoordinator listens to some events which could be opportunities
// for reducing memory consumption and notifies its clients.
class PLATFORM_EXPORT MemoryCoordinator final
: public GarbageCollected<MemoryCoordinator> {
WTF_MAKE_NONCOPYABLE(MemoryCoordinator);
public:
static MemoryCoordinator& instance();
// Whether the device Blink runs on is a low-end device.
// Can be overridden in layout tests via internals.
static bool isLowEndDevice();
// Caches whether this device is a low-end device in a static member.
// instance() is not used as it's a heap allocated object - meaning it's not
// thread-safe as well as might break tests counting the heap size.
static void initialize();
void registerClient(MemoryCoordinatorClient*);
void unregisterClient(MemoryCoordinatorClient*);
// TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
// gone.
void onMemoryPressure(WebMemoryPressureLevel);
void onMemoryStateChange(MemoryState);
DECLARE_TRACE();
private:
friend class Internals;
static void setIsLowEndDeviceForTesting(bool);
MemoryCoordinator();
void clearMemory();
static bool s_isLowEndDevice;
HeapHashSet<WeakMember<MemoryCoordinatorClient>> m_clients;
};
} // namespace blink
#endif // MemoryCoordinator_h
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