Quelle ServiceWorkerJobQueue.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ServiceWorkerJobQueue.h"

#include "nsThreadUtils.h"
#include "ServiceWorkerJob.h"
#include "mozilla/dom/WorkerCommon.h"

namespace mozilla::dom {

class ServiceWorkerJobQueue::Callback final
    : public ServiceWorkerJob::Callback {
  RefPtr<ServiceWorkerJobQueue> mQueue;

  ~Callback() = default;

public:
  explicit Callback(ServiceWorkerJobQueue* aQueue) : mQueue(aQueue) {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(mQueue);
  }

  virtual void JobFinished(ServiceWorkerJob* aJob,
                           ErrorResult& aStatus) override {
    MOZ_ASSERT(NS_IsMainThread());
    mQueue->JobFinished(aJob);
  }

  virtual void JobDiscarded(ErrorResult&) override {
    // no-op; nothing to do.
  }

  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJobQueue::Callback, override)
};

ServiceWorkerJobQueue::~ServiceWorkerJobQueue() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mJobList.IsEmpty());
}

void ServiceWorkerJobQueue::JobFinished(ServiceWorkerJob* aJob) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aJob);

  // XXX There are some corner cases where jobs can double-complete.  Until
  // we track all these down we do a non-fatal assert in debug builds and
  // a runtime check to verify the queue is in the correct state.
  NS_ASSERTION(!mJobList.IsEmpty(),
               "Job queue should contain the job that just completed.");
  NS_ASSERTION(mJobList.SafeElementAt(0, nullptr) == aJob,
               "Job queue should contain the job that just completed.");
  if (NS_WARN_IF(mJobList.SafeElementAt(0, nullptr) != aJob)) {
    return;
  }

  mJobList.RemoveElementAt(0);

  if (mJobList.IsEmpty()) {
    return;
  }

  RunJob();
}

void ServiceWorkerJobQueue::RunJob() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mJobList.IsEmpty());
  MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Initial);

  RefPtr<Callback> callback = new Callback(this);
  mJobList[0]->Start(callback);
}

ServiceWorkerJobQueue::ServiceWorkerJobQueue() {
  MOZ_ASSERT(NS_IsMainThread());
}

void ServiceWorkerJobQueue::ScheduleJob(ServiceWorkerJob* aJob) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aJob);
  MOZ_ASSERT(!mJobList.Contains(aJob));

  if (mJobList.IsEmpty()) {
    mJobList.AppendElement(aJob);
    RunJob();
    return;
  }

  MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);

  RefPtr<ServiceWorkerJob>& tailJob = mJobList[mJobList.Length() - 1];
  if (!tailJob->ResultCallbacksInvoked() && aJob->IsEquivalentTo(tailJob)) {
    tailJob->StealResultCallbacksFrom(aJob);
    return;
  }

  mJobList.AppendElement(aJob);
}

void ServiceWorkerJobQueue::CancelAll() {
  MOZ_ASSERT(NS_IsMainThread());

  for (RefPtr<ServiceWorkerJob>& job : mJobList) {
    job->Cancel();
  }

  // Remove jobs that are queued but not started since they should never
  // run after being canceled.  This means throwing away all jobs except
  // for the job at the front of the list.
  if (!mJobList.IsEmpty()) {
    MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);
    mJobList.TruncateLength(1);
  }
}

}  // namespace mozilla::dom

quality93%

¤ Dauer der Verarbeitung: 0.13 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.