dom/abort/AbortController.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 "AbortController.h"
   8 #include "AbortSignal.h"
   9 #include "js/Value.h"
  10 #include "mozilla/dom/AbortControllerBinding.h"
  11 #include "mozilla/dom/BindingUtils.h"
  12 #include "mozilla/dom/DOMException.h"
  13 #include "mozilla/dom/WorkerPrivate.h"
  14 #include "mozilla/HoldDropJSObjects.h"
  15
  16 namespace mozilla::dom {
  17
  18 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WITH_JS_MEMBERS(AbortController,
  19                                                       (mGlobal, mSignal),
  20                                                       (mReason))
  21
  22 NS_IMPL_CYCLE_COLLECTING_ADDREF(AbortController)
  23 NS_IMPL_CYCLE_COLLECTING_RELEASE(AbortController)
  24
  25 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AbortController)
  26   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  27   NS_INTERFACE_MAP_ENTRY(nsISupports)
  28 NS_INTERFACE_MAP_END
  29
  30 /* static */
  31 already_AddRefed<AbortController> AbortController::Constructor(
  32     const GlobalObject& aGlobal, ErrorResult& aRv) {
  33   nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
  34   if (!global) {
  35     aRv.Throw(NS_ERROR_FAILURE);
  36     return nullptr;
  37   }
  38
  39   RefPtr<AbortController> abortController = new AbortController(global);
  40   return abortController.forget();
  41 }
  42
  43 AbortController::AbortController(nsIGlobalObject* aGlobal)
  44     : mGlobal(aGlobal), mAborted(false), mReason(JS::UndefinedHandleValue) {
  45   mozilla::HoldJSObjects(this);
  46 }
  47
  48 JSObject* AbortController::WrapObject(JSContext* aCx,
  49                                       JS::Handle<JSObject*> aGivenProto) {
  50   return AbortController_Binding::Wrap(aCx, this, aGivenProto);
  51 }
  52
  53 nsIGlobalObject* AbortController::GetParentObject() const { return mGlobal; }
  54
  55 AbortSignal* AbortController::Signal() {
  56   if (!mSignal) {
  57     JS::Rooted<JS::Value> reason(RootingCx(), mReason);
  58     mSignal = new AbortSignal(mGlobal, mAborted, reason);
  59   }
  60
  61   return mSignal;
  62 }
  63
  64 void AbortController::Abort(JSContext* aCx, JS::Handle<JS::Value> aReason) {
  65   if (mAborted) {
  66     return;
  67   }
  68
  69   mAborted = true;
  70
  71   if (mSignal) {
  72     mSignal->SignalAbort(aReason);
  73   } else {
  74     mReason = aReason;
  75   }
  76 }
  77
  78 AbortController::~AbortController() { mozilla::DropJSObjects(this); }
  79
  80 }  // namespace mozilla::dom