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| 1 // Copyright (c) 2013 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 #include "base/memory/memory_pressure_listener.h" |
| 6 |
| 7 #include "base/lazy_instance.h" |
| 8 #include "base/observer_list_threadsafe.h" |
| 9 |
| 10 namespace { |
| 11 |
| 12 base::LazyInstance<ObserverListThreadSafe<base::MemoryPressureListener> >::Leaky |
| 13 g_observers = LAZY_INSTANCE_INITIALIZER; |
| 14 |
| 15 } // namespace |
| 16 |
| 17 namespace base { |
| 18 |
| 19 MemoryPressureListener::MemoryPressureListener( |
| 20 const MemoryPressureListener::MemoryPressureCallback& callback) |
| 21 : callback_(callback) { |
| 22 g_observers.Get().AddObserver(this); |
| 23 } |
| 24 |
| 25 MemoryPressureListener::~MemoryPressureListener() { |
| 26 g_observers.Get().RemoveObserver(this); |
| 27 } |
| 28 |
| 29 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { |
| 30 callback_.Run(memory_pressure_level); |
| 31 } |
| 32 |
| 33 // static |
| 34 void MemoryPressureListener::NotifyMemoryPressure( |
| 35 MemoryPressureLevel memory_pressure_level) { |
| 36 g_observers.Get().Notify(&MemoryPressureListener::Notify, |
| 37 memory_pressure_level); |
| 38 } |
| 39 |
| 40 } // namespace base |
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