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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_AvailableMemoryWatcher_h
+#define mozilla_AvailableMemoryWatcher_h
+
+#include "mozilla/ipc/CrashReporterHost.h"
+#include "mozilla/UniquePtr.h"
+#include "MemoryPressureLevelMac.h"
+#include "nsCOMPtr.h"
+#include "nsIAvailableMemoryWatcherBase.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+
+namespace mozilla {
+
+// This class implements a platform-independent part to watch the system's
+// memory situation and invoke the registered callbacks when we detect
+// a low-memory situation or a high-memory situation.
+// The actual logic to monitor the memory status is implemented in a subclass
+// of nsAvailableMemoryWatcherBase per platform.
+class nsAvailableMemoryWatcherBase : public nsIAvailableMemoryWatcherBase,
+ public nsIObserver {
+ static StaticRefPtr<nsAvailableMemoryWatcherBase> sSingleton;
+ static const char* const kObserverTopics[];
+
+ TimeStamp mLowMemoryStart;
+
+ protected:
+ uint32_t mNumOfTabUnloading;
+ uint32_t mNumOfMemoryPressure;
+
+ nsCOMPtr<nsITabUnloader> mTabUnloader;
+ nsCOMPtr<nsIObserverService> mObserverSvc;
+ // Do not change this value off the main thread.
+ bool mInteracting;
+
+ virtual ~nsAvailableMemoryWatcherBase() = default;
+ virtual nsresult Init();
+ void Shutdown();
+ void UpdateLowMemoryTimeStamp();
+ void RecordTelemetryEventOnHighMemory();
+
+ public:
+ static already_AddRefed<nsAvailableMemoryWatcherBase> GetSingleton();
+
+ nsAvailableMemoryWatcherBase();
+
+#if defined(XP_DARWIN)
+ virtual void OnMemoryPressureChanged(MacMemoryPressureLevel aNewLevel){};
+ virtual void AddChildAnnotations(
+ const UniquePtr<ipc::CrashReporterHost>& aCrashReporter){};
+#endif
+
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSIAVAILABLEMEMORYWATCHERBASE
+ NS_DECL_NSIOBSERVER
+};
+
+// Method to create a platform-specific object
+already_AddRefed<nsAvailableMemoryWatcherBase> CreateAvailableMemoryWatcher();
+
+} // namespace mozilla
+
+#endif // ifndef mozilla_AvailableMemoryWatcher_h