/* -*- 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 "ServiceWorkerJob.h" #include "Workers.h" namespace mozilla { namespace dom { namespace workers { class ServiceWorkerJobQueue::Callback final : public ServiceWorkerJob::Callback { RefPtr<ServiceWorkerJobQueue> mQueue; ~Callback() { } public: explicit Callback(ServiceWorkerJobQueue* aQueue) : mQueue(aQueue) { AssertIsOnMainThread(); MOZ_ASSERT(mQueue); } virtual void JobFinished(ServiceWorkerJob* aJob, ErrorResult& aStatus) override { AssertIsOnMainThread(); mQueue->JobFinished(aJob); } NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJobQueue::Callback, override) }; ServiceWorkerJobQueue::~ServiceWorkerJobQueue() { AssertIsOnMainThread(); MOZ_ASSERT(mJobList.IsEmpty()); } void ServiceWorkerJobQueue::JobFinished(ServiceWorkerJob* aJob) { AssertIsOnMainThread(); 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() { AssertIsOnMainThread(); MOZ_ASSERT(!mJobList.IsEmpty()); MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Initial); RefPtr<Callback> callback = new Callback(this); mJobList[0]->Start(callback); } ServiceWorkerJobQueue::ServiceWorkerJobQueue() { AssertIsOnMainThread(); } void ServiceWorkerJobQueue::ScheduleJob(ServiceWorkerJob* aJob) { AssertIsOnMainThread(); 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() { AssertIsOnMainThread(); 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 workers } // namespace dom } // namespace mozilla