tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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WebTaskController.cpp (2788B)

      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 
     10 #include "TaskSignal.h"
     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 = TaskSignal::Create(aGlobal, aPriority);
     20 }
     21 
     22 void WebTaskController::SignalPriorityChange(TaskSignal* aTaskSignal,
     23                                             TaskPriority aPriority,
     24                                             ErrorResult& aRv) {
     25  RefPtr<TaskSignal> taskSignal = aTaskSignal;
     26 
     27  MOZ_ASSERT(taskSignal);
     28  if (taskSignal->PriorityChanging()) {
     29    aRv.ThrowNotAllowedError("Signal's priority changing is true");
     30    return;
     31  }
     32 
     33  if (taskSignal->Priority() == aPriority) {
     34    return;
     35  }
     36 
     37  taskSignal->SetPriorityChanging(true);
     38 
     39  TaskPriority previousPriority = taskSignal->Priority();
     40  taskSignal->SetPriority(aPriority);
     41 
     42  taskSignal->RunPriorityChangeAlgorithms();
     43 
     44  TaskPriorityChangeEventInit init;
     45  init.mPreviousPriority = previousPriority;
     46  RefPtr<TaskPriorityChangeEvent> event = TaskPriorityChangeEvent::Constructor(
     47      taskSignal, u"prioritychange"_ns, init);
     48 
     49  event->SetTrusted(true);
     50 
     51  taskSignal->DispatchEvent(*event);
     52 
     53  for (const RefPtr<TaskSignal>& dependentSignal :
     54       taskSignal->DependentTaskSignals().Clone()) {
     55    SignalPriorityChange(dependentSignal, aPriority, aRv);
     56  }
     57 
     58  taskSignal->SetPriorityChanging(false);
     59 }
     60 
     61 void WebTaskController::SetPriority(TaskPriority aPriority, ErrorResult& aRv) {
     62  MOZ_ASSERT(mSignal->IsTaskSignal());
     63  // mSignal for WebTaskController should always be a TaskSignal.
     64  SignalPriorityChange(static_cast<TaskSignal*>(mSignal.get()), aPriority, aRv);
     65 }
     66 
     67 already_AddRefed<WebTaskController> WebTaskController::Constructor(
     68    const GlobalObject& aGlobal, const TaskControllerInit& aInit,
     69    ErrorResult& aRv) {
     70  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
     71  if (!global) {
     72    aRv.Throw(NS_ERROR_FAILURE);
     73    return nullptr;
     74  }
     75  RefPtr<WebTaskController> webTaskController =
     76      new WebTaskController(global, aInit.mPriority);
     77  return webTaskController.forget();
     78 }
     79 
     80 JSObject* WebTaskController::WrapObject(JSContext* aCx,
     81                                        JS::Handle<JSObject*> aGivenProto) {
     82  return TaskController_Binding::Wrap(aCx, this, aGivenProto);
     83 }
     84 }  // namespace mozilla::dom