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// Copyright (c) 2012 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 "content/browser/power_save_blocker.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "chromeos/power/power_state_override.h"
#include "content/public/browser/browser_thread.h"
namespace content {
class PowerSaveBlocker::Delegate
: public base::RefCountedThreadSafe<PowerSaveBlocker::Delegate> {
public:
Delegate(PowerSaveBlockerType type) : type_(type) {}
// Creates a PowerStateOverride object to override the default power
// management behavior.
void ApplyBlock() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
chromeos::PowerStateOverride::Mode mode =
chromeos::PowerStateOverride::BLOCK_SYSTEM_SUSPEND;
switch (type_) {
case kPowerSaveBlockPreventAppSuspension:
mode = chromeos::PowerStateOverride::BLOCK_SYSTEM_SUSPEND;
break;
case kPowerSaveBlockPreventDisplaySleep:
mode = chromeos::PowerStateOverride::BLOCK_DISPLAY_SLEEP;
break;
default:
NOTREACHED() << "Unhandled block type " << type_;
}
override_ = new chromeos::PowerStateOverride(mode);
}
// Resets the previously-created PowerStateOverride object.
void RemoveBlock() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
override_ = NULL;
}
private:
friend class base::RefCountedThreadSafe<Delegate>;
virtual ~Delegate() {}
PowerSaveBlockerType type_;
scoped_refptr<chromeos::PowerStateOverride> override_;
DISALLOW_COPY_AND_ASSIGN(Delegate);
};
PowerSaveBlocker::PowerSaveBlocker(PowerSaveBlockerType type,
const std::string& reason)
: delegate_(new Delegate(type)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&Delegate::ApplyBlock, delegate_));
}
PowerSaveBlocker::~PowerSaveBlocker() {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&Delegate::RemoveBlock, delegate_));
}
} // namespace content
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