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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_AbortSignal_h
#define mozilla_dom_AbortSignal_h
#include "mozilla/RefPtr.h"
#include "mozilla/dom/AbortFollower.h"
#include "mozilla/DOMEventTargetHelper.h"
namespace mozilla::dom {
// AbortSignal the spec concept includes the concept of a child signal
// "following" a parent signal -- internally, adding abort steps to the parent
// signal that will then signal abort on the child signal -- to propagate
// signaling abort from one signal to another. See
// <https://dom.spec.whatwg.org/#abortsignal-follow>.
//
// This requires that AbortSignal also inherit from AbortFollower.
//
// This ability to follow isn't directly exposed in the DOM; as of this writing
// it appears only to be used internally in the Fetch API. It might be a good
// idea to split AbortSignal into an implementation that can follow, and an
// implementation that can't, to provide this complexity only when it's needed.
class AbortSignal : public DOMEventTargetHelper,
public AbortSignalImpl,
public AbortFollower {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(AbortSignal,
DOMEventTargetHelper)
AbortSignal(nsIGlobalObject* aGlobalObject, bool aAborted,
JS::Handle<JS::Value> aReason);
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
IMPL_EVENT_HANDLER(abort);
static already_AddRefed<AbortSignal> Abort(GlobalObject& aGlobal,
JS::Handle<JS::Value> aReason);
static already_AddRefed<AbortSignal> Timeout(GlobalObject& aGlobal,
uint64_t aMilliseconds,
ErrorResult& aRv);
static already_AddRefed<AbortSignal> Any(
GlobalObject& aGlobal,
const Sequence<OwningNonNull<AbortSignal>>& aSignals);
void ThrowIfAborted(JSContext* aCx, ErrorResult& aRv);
// AbortSignalImpl
void SignalAbort(JS::Handle<JS::Value> aReason) override;
// AbortFollower
void RunAbortAlgorithm() override;
virtual bool IsTaskSignal() const { return false; }
bool Dependent() const;
protected:
~AbortSignal();
void MakeDependentOn(AbortSignal* aSignal);
nsTArray<WeakPtr<AbortSignal>> mSourceSignals;
nsTArray<RefPtr<AbortSignal>> mDependentSignals;
bool mDependent;
};
} // namespace mozilla::dom
#endif // mozilla_dom_AbortSignal_h
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