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/*
* Copyright (C) 2013 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 AsyncMethodRunner_h
#define AsyncMethodRunner_h
#include "platform/Timer.h"
#include "wtf/FastAllocBase.h"
#include "wtf/Noncopyable.h"
namespace blink {
template <typename TargetClass>
class AsyncMethodRunner final {
WTF_MAKE_NONCOPYABLE(AsyncMethodRunner);
WTF_MAKE_FAST_ALLOCATED;
public:
typedef void (TargetClass::*TargetMethod)();
AsyncMethodRunner(TargetClass* object, TargetMethod method)
: m_timer(this, &AsyncMethodRunner<TargetClass>::fired)
, m_object(object)
, m_method(method)
, m_suspended(false)
, m_runWhenResumed(false)
{
}
// Schedules to run the method asynchronously. Do nothing if it's already
// scheduled. If it's suspended, remember to schedule to run the method when
// resume() is called.
void runAsync()
{
if (m_suspended) {
ASSERT(!m_timer.isActive());
m_runWhenResumed = true;
return;
}
// FIXME: runAsync should take a TraceLocation and pass it to timer here.
if (!m_timer.isActive())
m_timer.startOneShot(0, FROM_HERE);
}
// If it's scheduled to run the method, cancel it and remember to schedule
// it again when resume() is called. Mainly for implementing
// ActiveDOMObject::suspend().
void suspend()
{
if (m_suspended)
return;
m_suspended = true;
if (!m_timer.isActive())
return;
m_timer.stop();
m_runWhenResumed = true;
}
// Resumes pending method run.
void resume()
{
if (!m_suspended)
return;
m_suspended = false;
if (!m_runWhenResumed)
return;
m_runWhenResumed = false;
// FIXME: resume should take a TraceLocation and pass it to timer here.
m_timer.startOneShot(0, FROM_HERE);
}
void stop()
{
if (m_suspended) {
ASSERT(!m_timer.isActive());
m_runWhenResumed = false;
m_suspended = false;
return;
}
ASSERT(!m_runWhenResumed);
if (m_timer.isActive())
m_timer.stop();
}
bool isActive() const
{
return m_timer.isActive();
}
private:
void fired(Timer<AsyncMethodRunner<TargetClass> >*) { (m_object->*m_method)(); }
Timer<AsyncMethodRunner<TargetClass> > m_timer;
// FIXME: oilpan: AsyncMethodRunner should be moved to the heap and m_object should be traced.
// This raw pointer is safe as long as AsyncMethodRunner<X> is held by the X itself
// (That's the case in the current code base).
GC_PLUGIN_IGNORE("363031")
TargetClass* m_object;
TargetMethod m_method;
bool m_suspended;
bool m_runWhenResumed;
};
}
#endif
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