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/*
* Copyright (C) 2010 Google, 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. ``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
* 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 HTMLParserScheduler_h
#define HTMLParserScheduler_h
#include "Timer.h"
#include <wtf/CurrentTime.h>
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class HTMLDocumentParser;
class HTMLParserScheduler : public Noncopyable {
public:
static PassOwnPtr<HTMLParserScheduler> create(HTMLDocumentParser* parser)
{
return adoptPtr(new HTMLParserScheduler(parser));
}
~HTMLParserScheduler();
struct PumpSession {
PumpSession()
: processedTokens(0)
, startTime(currentTime())
{
}
int processedTokens;
double startTime;
};
// Inline as this is called after every token in the parser.
bool shouldContinueParsing(PumpSession& session)
{
if (session.processedTokens > m_parserChunkSize) {
session.processedTokens = 0;
double elapsedTime = currentTime() - session.startTime;
if (elapsedTime > m_parserTimeLimit) {
// Schedule the parser to continue and yield from the parser.
m_continueNextChunkTimer.startOneShot(0);
return false;
}
}
++session.processedTokens;
return true;
}
bool isScheduledForResume() const { return m_isSuspendedWithActiveTimer || m_continueNextChunkTimer.isActive(); }
void suspend();
void resume();
private:
HTMLParserScheduler(HTMLDocumentParser*);
void continueNextChunkTimerFired(Timer<HTMLParserScheduler>*);
HTMLDocumentParser* m_parser;
double m_parserTimeLimit;
int m_parserChunkSize;
Timer<HTMLParserScheduler> m_continueNextChunkTimer;
bool m_isSuspendedWithActiveTimer;
};
}
#endif
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