dom/webscheduling/WebTaskController.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:expandtab:shiftwidth=2:tabstop=2:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "WebTaskController.h"
   9 #include "TaskSignal.h"
  10
  11 #include "mozilla/dom/TaskPriorityChangeEvent.h"
  12
  13 namespace mozilla::dom {
  14
  15 WebTaskController::WebTaskController(nsIGlobalObject* aGlobal,
  16                                      TaskPriority aPriority)
  17     : AbortController(aGlobal) {
  18   MOZ_ASSERT(!mSignal);
  19   mSignal = new TaskSignal(aGlobal, aPriority);
  20 }
  21
  22 void WebTaskController::SetPriority(TaskPriority aPriority, ErrorResult& aRv) {
  23   // https://wicg.github.io/scheduling-apis/#tasksignal-signal-priority-change
  24   RefPtr<TaskSignal> taskSignal = static_cast<TaskSignal*>(mSignal.get());
  25   MOZ_ASSERT(taskSignal);
  26   if (taskSignal->PriorityChanging()) {
  27     aRv.ThrowNotAllowedError("Signal's priority changing is true");
  28     return;
  29   }
  30
  31   if (taskSignal->Priority() == aPriority) {
  32     return;
  33   }
  34
  35   taskSignal->SetPriorityChanging(true);
  36
  37   TaskPriority previousPriority = taskSignal->Priority();
  38   taskSignal->SetPriority(aPriority);
  39
  40   taskSignal->RunPriorityChangeAlgorithms();
  41
  42   TaskPriorityChangeEventInit init;
  43   init.mPreviousPriority = previousPriority;
  44   RefPtr<TaskPriorityChangeEvent> event = TaskPriorityChangeEvent::Constructor(
  45       taskSignal, u"prioritychange"_ns, init);
  46
  47   event->SetTrusted(true);
  48
  49   taskSignal->DispatchEvent(*event);
  50   taskSignal->SetPriorityChanging(false);
  51 }
  52
  53 already_AddRefed<WebTaskController> WebTaskController::Constructor(
  54     const GlobalObject& aGlobal, const TaskControllerInit& aInit,
  55     ErrorResult& aRv) {
  56   nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
  57   if (!global) {
  58     aRv.Throw(NS_ERROR_FAILURE);
  59     return nullptr;
  60   }
  61   RefPtr<WebTaskController> webTaskController =
  62       new WebTaskController(global, aInit.mPriority);
  63   return webTaskController.forget();
  64 }
  65
  66 JSObject* WebTaskController::WrapObject(JSContext* aCx,
  67                                         JS::Handle<JSObject*> aGivenProto) {
  68   return TaskController_Binding::Wrap(aCx, this, aGivenProto);
  69 }
  70 }  // namespace mozilla::dom