dom/fetch/FetchObserver.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "FetchObserver.h"
   8 #include "mozilla/dom/Event.h"
   9 #include "mozilla/dom/EventBinding.h"
  10
  11 namespace mozilla::dom {
  12
  13 NS_IMPL_CYCLE_COLLECTION_CLASS(FetchObserver)
  14
  15 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(FetchObserver,
  16                                                   DOMEventTargetHelper)
  17   AbortFollower::Traverse(static_cast<AbortFollower*>(tmp), cb);
  18 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  19
  20 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FetchObserver,
  21                                                 DOMEventTargetHelper)
  22   AbortFollower::Unlink(static_cast<AbortFollower*>(tmp));
  23 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  24
  25 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FetchObserver)
  26 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
  27
  28 NS_IMPL_ADDREF_INHERITED(FetchObserver, DOMEventTargetHelper)
  29 NS_IMPL_RELEASE_INHERITED(FetchObserver, DOMEventTargetHelper)
  30
  31 FetchObserver::FetchObserver(nsIGlobalObject* aGlobal,
  32                              AbortSignalImpl* aSignalImpl)
  33     : DOMEventTargetHelper(aGlobal), mState(FetchState::Requesting) {
  34   if (aSignalImpl) {
  35     Follow(aSignalImpl);
  36   }
  37 }
  38
  39 JSObject* FetchObserver::WrapObject(JSContext* aCx,
  40                                     JS::Handle<JSObject*> aGivenProto) {
  41   return FetchObserver_Binding::Wrap(aCx, this, aGivenProto);
  42 }
  43
  44 FetchState FetchObserver::State() const { return mState; }
  45
  46 void FetchObserver::RunAbortAlgorithm() { SetState(FetchState::Aborted); }
  47
  48 void FetchObserver::SetState(FetchState aState) {
  49   MOZ_ASSERT(mState < aState);
  50
  51   if (mState == FetchState::Aborted || mState == FetchState::Errored ||
  52       mState == FetchState::Complete) {
  53     // We are already in a final state.
  54     return;
  55   }
  56
  57   // We cannot pass from Requesting to Complete directly.
  58   if (mState == FetchState::Requesting && aState == FetchState::Complete) {
  59     SetState(FetchState::Responding);
  60   }
  61
  62   mState = aState;
  63
  64   if (mState == FetchState::Aborted || mState == FetchState::Errored ||
  65       mState == FetchState::Complete) {
  66     Unfollow();
  67   }
  68
  69   EventInit init;
  70   init.mBubbles = false;
  71   init.mCancelable = false;
  72
  73   // TODO which kind of event should we dispatch here?
  74
  75   RefPtr<Event> event = Event::Constructor(this, u"statechange"_ns, init);
  76   event->SetTrusted(true);
  77
  78   DispatchEvent(*event);
  79 }
  80
  81 }  // namespace mozilla::dom