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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/. */
#include "AbortSignal.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventBinding.h"
#include "mozilla/dom/AbortSignalBinding.h"
#include "mozilla/RefPtr.h"
namespace mozilla::dom {
// AbortSignalImpl
// ----------------------------------------------------------------------------
AbortSignalImpl::AbortSignalImpl(bool aAborted) : mAborted(aAborted) {}
bool AbortSignalImpl::Aborted() const { return mAborted; }
// https://dom.spec.whatwg.org/#abortsignal-signal-abort steps 1-4
void AbortSignalImpl::SignalAbort() {
// Step 1.
if (mAborted) {
return;
}
// Step 2.
mAborted = true;
// Step 3.
// When there are multiple followers, the follower removal algorithm
// https://dom.spec.whatwg.org/#abortsignal-remove could be invoked in an
// earlier algorithm to remove a later algorithm, so |mFollowers| must be a
// |nsTObserverArray| to defend against mutation.
for (RefPtr<AbortFollower> follower : mFollowers.ForwardRange()) {
MOZ_ASSERT(follower->mFollowingSignal == this);
follower->RunAbortAlgorithm();
}
// Step 4.
// Clear follower->signal links, then clear signal->follower links.
for (AbortFollower* follower : mFollowers.ForwardRange()) {
follower->mFollowingSignal = nullptr;
}
mFollowers.Clear();
}
/* static */ void AbortSignalImpl::Traverse(
AbortSignalImpl* aSignal, nsCycleCollectionTraversalCallback& cb) {
// To be filled in shortly.
}
// AbortSignal
// ----------------------------------------------------------------------------
NS_IMPL_CYCLE_COLLECTION_CLASS(AbortSignal)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(AbortSignal,
DOMEventTargetHelper)
AbortSignalImpl::Traverse(static_cast<AbortSignalImpl*>(tmp), cb);
AbortFollower::Traverse(static_cast<AbortFollower*>(tmp), cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(AbortSignal,
DOMEventTargetHelper)
AbortSignalImpl::Unlink(static_cast<AbortSignalImpl*>(tmp));
AbortFollower::Unlink(static_cast<AbortFollower*>(tmp));
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AbortSignal)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(AbortSignal, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(AbortSignal, DOMEventTargetHelper)
AbortSignal::AbortSignal(nsIGlobalObject* aGlobalObject, bool aAborted)
: DOMEventTargetHelper(aGlobalObject), AbortSignalImpl(aAborted) {}
JSObject* AbortSignal::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return AbortSignal_Binding::Wrap(aCx, this, aGivenProto);
}
// https://dom.spec.whatwg.org/#abortsignal-signal-abort
void AbortSignal::SignalAbort() {
// Steps 1-4.
AbortSignalImpl::SignalAbort();
// Step 5.
EventInit init;
init.mBubbles = false;
init.mCancelable = false;
RefPtr<Event> event = Event::Constructor(this, u"abort"_ns, init);
event->SetTrusted(true);
DispatchEvent(*event);
}
// AbortFollower
// ----------------------------------------------------------------------------
AbortFollower::~AbortFollower() { Unfollow(); }
// https://dom.spec.whatwg.org/#abortsignal-add
void AbortFollower::Follow(AbortSignalImpl* aSignal) {
// Step 1.
if (aSignal->mAborted) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(aSignal);
Unfollow();
// Step 2.
mFollowingSignal = aSignal;
MOZ_ASSERT(!aSignal->mFollowers.Contains(this));
aSignal->mFollowers.AppendElement(this);
}
// https://dom.spec.whatwg.org/#abortsignal-remove
void AbortFollower::Unfollow() {
if (mFollowingSignal) {
// |Unfollow| is called by cycle-collection unlink code that runs in no
// guaranteed order. So we can't, symmetric with |Follow| above, assert
// that |this| will be found in |mFollowingSignal->mFollowers|.
mFollowingSignal->mFollowers.RemoveElement(this);
mFollowingSignal = nullptr;
}
}
bool AbortFollower::IsFollowing() const { return !!mFollowingSignal; }
/* static */ void AbortFollower::Traverse(
AbortFollower* aFollower, nsCycleCollectionTraversalCallback& cb) {
ImplCycleCollectionTraverse(cb, aFollower->mFollowingSignal,
"mFollowingSignal", 0);
}
} // namespace mozilla::dom
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