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Unified Diff: base/memory/memory_pressure_monitor.h

Issue 1048983006: Introduce base::MemoryPressureMonitor (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: review comments (CHECK->DCHECK) Created 5 years, 8 months ago
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Index: base/memory/memory_pressure_monitor.h
diff --git a/base/memory/memory_pressure_monitor.h b/base/memory/memory_pressure_monitor.h
new file mode 100644
index 0000000000000000000000000000000000000000..9aeeaca3cdca26f0f1376af981000cfeced6aa5b
--- /dev/null
+++ b/base/memory/memory_pressure_monitor.h
@@ -0,0 +1,39 @@
+// 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/memory/memory_pressure_listener.h"
+
+namespace base {
+
+// 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;
+
+ // Return the singleton MemoryPressureMonitor.
+ static MemoryPressureMonitor* Get();
+
+ // Returns the currently observed memory pressure.
+ virtual MemoryPressureLevel GetCurrentPressureLevel() const = 0;
+
+ protected:
+ MemoryPressureMonitor();
+ virtual ~MemoryPressureMonitor();
+
+ private:
+ DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
+};
+
+} // namespace base
+
+#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_H_
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