gecko-dev/dom/abort/AbortSignal.h

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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/DOMEventTargetHelper.h"
#include "nsTObserverArray.h"
namespace mozilla {
namespace dom {
class AbortSignal;
class AbortSignalImpl;
// This class must be implemented by objects who want to follow a
// AbortSignalImpl.
class AbortFollower {
public:
virtual void Abort() = 0;
void Follow(AbortSignalImpl* aSignal);
void Unfollow();
bool IsFollowing() const;
protected:
virtual ~AbortFollower();
// Subclasses of AbortFollower must Traverse this member and call
// Unfollow() when Unlinking.
RefPtr<AbortSignalImpl> mFollowingSignal;
};
// Any subclass of this class must Traverse mFollowingSignal and call
// Unfollow() when Unlinking.
class AbortSignalImpl : public AbortFollower, public nsISupports {
public:
explicit AbortSignalImpl(bool aAborted);
bool Aborted() const;
void Abort() override;
void AddFollower(AbortFollower* aFollower);
void RemoveFollower(AbortFollower* aFollower);
protected:
virtual ~AbortSignalImpl() = default;
private:
// Raw pointers. AbortFollower unregisters itself in the DTOR.
nsTObserverArray<AbortFollower*> mFollowers;
bool mAborted;
};
class AbortSignal final : public DOMEventTargetHelper, public AbortSignalImpl {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AbortSignal, DOMEventTargetHelper)
AbortSignal(nsIGlobalObject* aGlobalObject, bool aAborted);
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
IMPL_EVENT_HANDLER(abort);
void Abort() override;
private:
~AbortSignal() = default;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_AbortSignal_h