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/*
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ProcessThrottler_h
#define ProcessThrottler_h
#include "ProcessAssertion.h"
#include <wtf/RefCounter.h>
#include <wtf/RunLoop.h>
#include <wtf/WeakPtr.h>
namespace WebKit {
enum UserObservablePageTokenType { };
typedef RefCounter::Token<UserObservablePageTokenType> UserObservablePageToken;
enum ProcessSuppressionDisabledTokenType { };
typedef RefCounter::Token<ProcessSuppressionDisabledTokenType> ProcessSuppressionDisabledToken;
class ProcessThrottlerClient;
class ProcessThrottler : private ProcessAssertionClient {
public:
enum ForegroundActivityTokenType { };
typedef RefCounter::Token<ForegroundActivityTokenType> ForegroundActivityToken;
enum BackgroundActivityTokenType { };
typedef RefCounter::Token<BackgroundActivityTokenType> BackgroundActivityToken;
ProcessThrottler(ProcessThrottlerClient&);
inline ForegroundActivityToken foregroundActivityToken() const;
inline BackgroundActivityToken backgroundActivityToken() const;
void didConnectToProcess(PlatformProcessIdentifier);
void processReadyToSuspend();
void didCancelProcessSuspension();
private:
AssertionState assertionState();
void updateAssertion();
void updateAssertionNow();
void suspendTimerFired();
// ProcessAssertionClient
void assertionWillExpireImminently() override;
ProcessThrottlerClient& m_process;
std::unique_ptr<ProcessAndUIAssertion> m_assertion;
RunLoop::Timer<ProcessThrottler> m_suspendTimer;
RefCounter m_foregroundCounter;
RefCounter m_backgroundCounter;
int m_suspendMessageCount;
};
inline ProcessThrottler::ForegroundActivityToken ProcessThrottler::foregroundActivityToken() const
{
return ForegroundActivityToken(m_foregroundCounter.token<ForegroundActivityTokenType>());
}
inline ProcessThrottler::BackgroundActivityToken ProcessThrottler::backgroundActivityToken() const
{
return BackgroundActivityToken(m_backgroundCounter.token<BackgroundActivityTokenType>());
}
}
#endif // ProcessThrottler_h
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