blob: 661887c7829005444560066c58e4731cebda0481 [file] [log] [blame]
/*
* Copyright (C) 2018 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.
*/
#pragma once
#include "GenericTaskQueue.h"
namespace WebCore {
template <typename T>
class DeferrableTask : public CanMakeWeakPtr<DeferrableTask<T>> {
public:
DeferrableTask()
: m_dispatcher()
{
}
DeferrableTask(T& t)
: m_dispatcher(&t)
{
}
typedef WTF::Function<void ()> TaskFunction;
void scheduleTask(TaskFunction&& task)
{
if (m_isClosed)
return;
cancelTask();
m_pendingTask = true;
m_dispatcher.postTask([weakThis = makeWeakPtr(*this), task = WTFMove(task)] {
if (!weakThis)
return;
ASSERT(weakThis->m_pendingTask);
weakThis->m_pendingTask = false;
task();
});
}
void close()
{
cancelTask();
m_isClosed = true;
}
void cancelTask()
{
CanMakeWeakPtr<DeferrableTask<T>>::weakPtrFactory().revokeAll();
m_pendingTask = false;
}
bool hasPendingTask() const { return m_pendingTask; }
private:
TaskDispatcher<T> m_dispatcher;
bool m_pendingTask { false };
bool m_isClosed { false };
};
}