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 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  18
  19 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FetchObserver,
  20                                                 DOMEventTargetHelper)
  21 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  22
  23 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FetchObserver)
  24 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
  25
  26 NS_IMPL_ADDREF_INHERITED(FetchObserver, DOMEventTargetHelper)
  27 NS_IMPL_RELEASE_INHERITED(FetchObserver, DOMEventTargetHelper)
  28
  29 FetchObserver::FetchObserver(nsIGlobalObject* aGlobal,
  30                              AbortSignalImpl* aSignalImpl)
  31     : DOMEventTargetHelper(aGlobal), mState(FetchState::Requesting) {
  32   if (aSignalImpl) {
  33     Follow(aSignalImpl);
  34   }
  35 }
  36
  37 JSObject* FetchObserver::WrapObject(JSContext* aCx,
  38                                     JS::Handle<JSObject*> aGivenProto) {
  39   return FetchObserver_Binding::Wrap(aCx, this, aGivenProto);
  40 }
  41
  42 FetchState FetchObserver::State() const { return mState; }
  43
  44 void FetchObserver::RunAbortAlgorithm() { SetState(FetchState::Aborted); }
  45
  46 void FetchObserver::SetState(FetchState aState) {
  47   MOZ_ASSERT(mState < aState);
  48
  49   if (mState == FetchState::Aborted || mState == FetchState::Errored ||
  50       mState == FetchState::Complete) {
  51     // We are already in a final state.
  52     return;
  53   }
  54
  55   // We cannot pass from Requesting to Complete directly.
  56   if (mState == FetchState::Requesting && aState == FetchState::Complete) {
  57     SetState(FetchState::Responding);
  58   }
  59
  60   mState = aState;
  61
  62   if (mState == FetchState::Aborted || mState == FetchState::Errored ||
  63       mState == FetchState::Complete) {
  64     Unfollow();
  65   }
  66
  67   EventInit init;
  68   init.mBubbles = false;
  69   init.mCancelable = false;
  70
  71   // TODO which kind of event should we dispatch here?
  72
  73   RefPtr<Event> event = Event::Constructor(this, u"statechange"_ns, init);
  74   event->SetTrusted(true);
  75
  76   DispatchEvent(*event);
  77 }
  78
  79 }  // namespace mozilla::dom