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/*
* Copyright (C) 2019 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 "EventLoop.h"
#include "GCReachableRef.h"
#include "Timer.h"
#include <wtf/HashSet.h>
#include <wtf/WeakHashMap.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CustomElementQueue;
class Document;
class HTMLSlotElement;
class MutationObserver;
class Page;
class SecurityOrigin;
// https://html.spec.whatwg.org/multipage/webappapis.html#window-event-loop
class WindowEventLoop final : public EventLoop {
public:
static Ref<WindowEventLoop> eventLoopForSecurityOrigin(const SecurityOrigin&);
virtual ~WindowEventLoop();
void queueMutationObserverCompoundMicrotask();
Vector<GCReachableRef<HTMLSlotElement>>& signalSlotList() { return m_signalSlotList; }
UncheckedKeyHashSet<RefPtr<MutationObserver>>& activeMutationObservers() { return m_activeObservers; }
UncheckedKeyHashSet<RefPtr<MutationObserver>>& suspendedMutationObservers() { return m_suspendedObservers; }
CustomElementQueue& backupElementQueue();
void scheduleIdlePeriod();
void opportunisticallyRunIdleCallbacks(std::optional<MonotonicTime> deadline = std::nullopt);
MonotonicTime computeIdleDeadline();
WEBCORE_EXPORT static void breakToAllowRenderingUpdate();
private:
static Ref<WindowEventLoop> create(const String&);
WindowEventLoop(const String&);
void scheduleToRun() final;
bool isContextThread() const final;
MicrotaskQueue& microtaskQueue() final;
void startIdlePeriod(MonotonicTime);
bool shouldEndIdlePeriod();
std::optional<MonotonicTime> nextScheduledWorkTime() const;
std::optional<MonotonicTime> nextRenderingTime() const;
void didReachTimeToRun();
void didFireIdleTimer();
void decayIdleCallbackDuration() { m_expectedIdleCallbackDuration /= 2; }
String m_agentClusterKey;
Timer m_timer;
Timer m_idleTimer;
std::unique_ptr<MicrotaskQueue> m_microtaskQueue;
// Each task scheduled in event loop is associated with a document so that it can be suspened or stopped
// when the associated document is suspened or stopped. This task group is used to schedule a task
// which is not scheduled to a specific document, and should only be used when it's absolutely required.
EventLoopTaskGroup m_perpetualTaskGroupForSimilarOriginWindowAgents;
bool m_mutationObserverCompoundMicrotaskQueuedFlag { false };
bool m_deliveringMutationRecords { false }; // FIXME: This flag doesn't exist in the spec.
Vector<GCReachableRef<HTMLSlotElement>> m_signalSlotList; // https://dom.spec.whatwg.org/#signal-slot-list
UncheckedKeyHashSet<RefPtr<MutationObserver>> m_activeObservers;
UncheckedKeyHashSet<RefPtr<MutationObserver>> m_suspendedObservers;
std::unique_ptr<CustomElementQueue> m_customElementQueue;
bool m_processingBackupElementQueue { false };
MonotonicTime m_lastIdlePeriodStartTime;
Seconds m_expectedIdleCallbackDuration { 4_ms };
};
} // namespace WebCore
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