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/*
* Copyright (C) 2024 Marais Rossouw <me@marais.co>. 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.
*/
#include "config.h"
#include "InternalObserverDrop.h"
#include "InternalObserver.h"
#include "Observable.h"
#include "ScriptExecutionContext.h"
#include "SubscribeOptions.h"
#include "Subscriber.h"
#include "SubscriberCallback.h"
#include <JavaScriptCore/JSCJSValueInlines.h>
namespace WebCore {
class InternalObserverDrop final : public InternalObserver {
public:
static Ref<InternalObserverDrop> create(ScriptExecutionContext& context, Ref<Subscriber> subscriber, uint64_t amount)
{
Ref internalObserver = adoptRef(*new InternalObserverDrop(context, subscriber, amount));
internalObserver->suspendIfNeeded();
return internalObserver;
}
class SubscriberCallbackDrop final : public SubscriberCallback {
public:
static Ref<SubscriberCallbackDrop> create(ScriptExecutionContext& context, Ref<Observable> source, uint64_t amount)
{
return adoptRef(*new InternalObserverDrop::SubscriberCallbackDrop(context, source, amount));
}
CallbackResult<void> handleEvent(Subscriber& subscriber) final
{
RefPtr context = scriptExecutionContext();
if (!context) {
subscriber.complete();
return { };
}
SubscribeOptions options;
options.signal = &subscriber.signal();
m_sourceObservable->subscribeInternal(*context, InternalObserverDrop::create(*context, subscriber, m_amount), options);
return { };
}
CallbackResult<void> handleEventRethrowingException(Subscriber& subscriber) final
{
return handleEvent(subscriber);
}
private:
SubscriberCallbackDrop(ScriptExecutionContext& context, Ref<Observable> source, uint64_t amount)
: SubscriberCallback(&context)
, m_sourceObservable(source)
, m_amount(amount)
{ }
bool hasCallback() const final { return true; }
const Ref<Observable> m_sourceObservable;
uint64_t m_amount;
};
private:
void next(JSC::JSValue value) final
{
if (!m_amount) {
protectedSubscriber()->next(value);
return;
}
m_amount -= 1;
}
void error(JSC::JSValue value) final
{
protectedSubscriber()->error(value);
}
void complete() final
{
InternalObserver::complete();
protectedSubscriber()->complete();
}
void visitAdditionalChildren(JSC::AbstractSlotVisitor& visitor) const final
{
m_subscriber->visitAdditionalChildren(visitor);
}
Ref<Subscriber> protectedSubscriber() const { return m_subscriber; }
InternalObserverDrop(ScriptExecutionContext& context, Ref<Subscriber> subscriber, uint64_t amount)
: InternalObserver(context)
, m_subscriber(subscriber)
, m_amount(amount)
{ }
const Ref<Subscriber> m_subscriber;
uint64_t m_amount;
};
Ref<SubscriberCallback> createSubscriberCallbackDrop(ScriptExecutionContext& context, Ref<Observable> observable, uint64_t amount)
{
return InternalObserverDrop::SubscriberCallbackDrop::create(context, observable, amount);
}
} // namespace WebCore
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