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/*
* Copyright (C) 2025 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#if USE(GLIB_EVENT_LOOP)
#include <wtf/Lock.h>
#include <wtf/RunLoop.h>
#include <wtf/ThreadSafeWeakPtr.h>
namespace WTF {
// Activity observers (used to implement WebCore::RunLoopObserver)
class ActivityObserver : public ThreadSafeRefCounted<ActivityObserver> {
WTF_MAKE_TZONE_ALLOCATED(ActivityObserver);
public:
using Callback = Function<void()>;
static Ref<ActivityObserver> create(Ref<RunLoop>&& runLoop, bool isRepeating, uint8_t order, OptionSet<RunLoop::Activity> activities, Callback&& callback)
{
return adoptRef(*new ActivityObserver(WTFMove(runLoop), isRepeating, order, activities, WTFMove(callback)));
}
~ActivityObserver()
{
ASSERT(!m_callback);
}
void start()
{
ASSERT(m_callback);
if (auto runLoop = m_runLoop.get())
runLoop->observeActivity(*this);
}
void stop()
{
{
Locker lock { m_callbackLock };
if (!m_callback)
return;
m_callback = nullptr;
}
if (auto runLoop = m_runLoop.get())
runLoop->unobserveActivity(*this);
}
uint8_t order() const { return m_order; }
OptionSet<RunLoop::Activity> activities() const { return m_activities; }
void notify()
{
{
Locker lock { m_callbackLock };
if (!m_callback)
return;
}
m_callback();
if (!m_isRepeating)
stop();
}
private:
ActivityObserver(Ref<RunLoop>&& runLoop, bool isRepeating, uint8_t order, OptionSet<RunLoop::Activity> activities, Callback&& callback)
: m_runLoop(WTFMove(runLoop))
, m_isRepeating(isRepeating)
, m_order(order)
, m_activities(activities)
, m_callback(WTFMove(callback))
{
ASSERT(m_callback);
}
private:
ThreadSafeWeakPtr<RunLoop> m_runLoop;
bool m_isRepeating { false };
uint8_t m_order { 0 };
OptionSet<RunLoop::Activity> m_activities;
mutable Lock m_callbackLock;
Callback m_callback WTF_GUARDED_BY_LOCK(m_callbackLock);
};
} // namespace WTF
using WTF::ActivityObserver;
#endif // USE(GLIB_EVENT_LOOP)
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