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// Copyright 2013 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.
#include "base/memory/memory_pressure_listener.h"
#include "base/lazy_instance.h"
#include "base/observer_list_threadsafe.h"
#include "base/trace_event/trace_event.h"
namespace {
// ObserverListThreadSafe is RefCountedThreadSafe, this traits is needed
// to ensure the LazyInstance will hold a reference to it.
struct LeakyLazyObserverListTraits :
base::internal::LeakyLazyInstanceTraits<
ObserverListThreadSafe<base::MemoryPressureListener> > {
static ObserverListThreadSafe<base::MemoryPressureListener>*
New(void* instance) {
ObserverListThreadSafe<base::MemoryPressureListener>* ret =
base::internal::LeakyLazyInstanceTraits<
ObserverListThreadSafe<base::MemoryPressureListener> >::New(
instance);
// Leaky.
ret->AddRef();
return ret;
}
};
base::LazyInstance<
ObserverListThreadSafe<base::MemoryPressureListener>,
LeakyLazyObserverListTraits> g_observers = LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace base {
MemoryPressureListener::MemoryPressureListener(
const MemoryPressureListener::MemoryPressureCallback& callback)
: callback_(callback) {
g_observers.Get().AddObserver(this);
}
MemoryPressureListener::~MemoryPressureListener() {
g_observers.Get().RemoveObserver(this);
}
void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) {
callback_.Run(memory_pressure_level);
}
// static
void MemoryPressureListener::NotifyMemoryPressure(
MemoryPressureLevel memory_pressure_level) {
DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE);
TRACE_EVENT1("memory", "MemoryPressureListener::NotifyMemoryPressure",
"level", memory_pressure_level);
g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify,
memory_pressure_level);
}
} // namespace base
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