Line data    Source code

       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 "ServiceWorkerJobQueue.h"
       8             : 
       9             : #include "ServiceWorkerJob.h"
      10             : #include "Workers.h"
      11             : 
      12             : namespace mozilla {
      13             : namespace dom {
      14             : namespace workers {
      15             : 
      16             : class ServiceWorkerJobQueue::Callback final : public ServiceWorkerJob::Callback
      17             : {
      18             :   RefPtr<ServiceWorkerJobQueue> mQueue;
      19             : 
      20           0 :   ~Callback()
      21           0 :   {
      22           0 :   }
      23             : 
      24             : public:
      25           0 :   explicit Callback(ServiceWorkerJobQueue* aQueue)
      26           0 :     : mQueue(aQueue)
      27             :   {
      28           0 :     AssertIsOnMainThread();
      29           0 :     MOZ_ASSERT(mQueue);
      30           0 :   }
      31             : 
      32             :   virtual void
      33           0 :   JobFinished(ServiceWorkerJob* aJob, ErrorResult& aStatus) override
      34             :   {
      35           0 :     AssertIsOnMainThread();
      36           0 :     mQueue->JobFinished(aJob);
      37           0 :   }
      38             : 
      39           0 :   NS_INLINE_DECL_REFCOUNTING(ServiceWorkerJobQueue::Callback, override)
      40             : };
      41             : 
      42           0 : ServiceWorkerJobQueue::~ServiceWorkerJobQueue()
      43             : {
      44           0 :   AssertIsOnMainThread();
      45           0 :   MOZ_ASSERT(mJobList.IsEmpty());
      46           0 : }
      47             : 
      48             : void
      49           0 : ServiceWorkerJobQueue::JobFinished(ServiceWorkerJob* aJob)
      50             : {
      51           0 :   AssertIsOnMainThread();
      52           0 :   MOZ_ASSERT(aJob);
      53             : 
      54             :   // XXX There are some corner cases where jobs can double-complete.  Until
      55             :   // we track all these down we do a non-fatal assert in debug builds and
      56             :   // a runtime check to verify the queue is in the correct state.
      57           0 :   NS_ASSERTION(!mJobList.IsEmpty(),
      58             :                "Job queue should contain the job that just completed.");
      59           0 :   NS_ASSERTION(mJobList.SafeElementAt(0, nullptr) == aJob,
      60             :                "Job queue should contain the job that just completed.");
      61           0 :   if (NS_WARN_IF(mJobList.SafeElementAt(0, nullptr) != aJob)) {
      62           0 :     return;
      63             :   }
      64             : 
      65           0 :   mJobList.RemoveElementAt(0);
      66             : 
      67           0 :   if (mJobList.IsEmpty()) {
      68           0 :     return;
      69             :   }
      70             : 
      71           0 :   RunJob();
      72             : }
      73             : 
      74             : void
      75           0 : ServiceWorkerJobQueue::RunJob()
      76             : {
      77           0 :   AssertIsOnMainThread();
      78           0 :   MOZ_ASSERT(!mJobList.IsEmpty());
      79           0 :   MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Initial);
      80             : 
      81           0 :   RefPtr<Callback> callback = new Callback(this);
      82           0 :   mJobList[0]->Start(callback);
      83           0 : }
      84             : 
      85           0 : ServiceWorkerJobQueue::ServiceWorkerJobQueue()
      86             : {
      87           0 :   AssertIsOnMainThread();
      88           0 : }
      89             : 
      90             : void
      91           0 : ServiceWorkerJobQueue::ScheduleJob(ServiceWorkerJob* aJob)
      92             : {
      93           0 :   AssertIsOnMainThread();
      94           0 :   MOZ_ASSERT(aJob);
      95           0 :   MOZ_ASSERT(!mJobList.Contains(aJob));
      96             : 
      97           0 :   if (mJobList.IsEmpty()) {
      98           0 :     mJobList.AppendElement(aJob);
      99           0 :     RunJob();
     100           0 :     return;
     101             :   }
     102             : 
     103           0 :   MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);
     104             : 
     105           0 :   RefPtr<ServiceWorkerJob>& tailJob = mJobList[mJobList.Length() - 1];
     106           0 :   if (!tailJob->ResultCallbacksInvoked() && aJob->IsEquivalentTo(tailJob)) {
     107           0 :     tailJob->StealResultCallbacksFrom(aJob);
     108           0 :     return;
     109             :   }
     110             : 
     111           0 :   mJobList.AppendElement(aJob);
     112             : }
     113             : 
     114             : void
     115           0 : ServiceWorkerJobQueue::CancelAll()
     116             : {
     117           0 :   AssertIsOnMainThread();
     118             : 
     119           0 :   for (RefPtr<ServiceWorkerJob>& job : mJobList) {
     120           0 :     job->Cancel();
     121             :   }
     122             : 
     123             :   // Remove jobs that are queued but not started since they should never
     124             :   // run after being canceled.  This means throwing away all jobs except
     125             :   // for the job at the front of the list.
     126           0 :   if (!mJobList.IsEmpty()) {
     127           0 :     MOZ_ASSERT(mJobList[0]->GetState() == ServiceWorkerJob::State::Started);
     128           0 :     mJobList.TruncateLength(1);
     129             :   }
     130           0 : }
     131             : 
     132             : } // namespace workers
     133             : } // namespace dom
     134             : } // namespace mozilla