Source/WebCore/bindings/js/JSMicrotaskCallback.h

/*
 * Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com>.
 *
 * 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.
 *
 */

#pragma once

#include "JSExecState.h"

namespace WebCore {

class JSMicrotaskCallback : public RefCounted<JSMicrotaskCallback> {
public:
    static Ref<JSMicrotaskCallback> create(JSDOMGlobalObject& globalObject, Ref<JSC::Microtask>&& task)
    {
        return adoptRef(*new JSMicrotaskCallback(globalObject, WTFMove(task)));
    }

    void call()
    {
        auto protectedThis { makeRef(*this) };
        JSC::VM& vm = m_globalObject->vm();
        JSC::JSLockHolder lock(vm);
        auto scope = DECLARE_THROW_SCOPE(vm);
        JSExecState::runTask(m_globalObject->globalExec(), m_task);
        scope.assertNoException();
    }

private:
    JSMicrotaskCallback(JSDOMGlobalObject& globalObject, Ref<JSC::Microtask>&& task)
        : m_globalObject { globalObject.vm(), &globalObject }
        , m_task { WTFMove(task) }
    {
    }

    JSC::Strong<JSDOMGlobalObject> m_globalObject;
    Ref<JSC::Microtask> m_task;
};

} // namespace WebCore