File: ServiceWorkerJobQueue.cpp

package info (click to toggle)
thunderbird 1:60.8.0-1~deb9u1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 2,339,208 kB
  • sloc: cpp: 5,456,704; ansic: 2,360,384; python: 596,095; asm: 340,963; java: 326,291; xml: 258,664; sh: 84,366; makefile: 23,702; perl: 17,317; objc: 3,768; yacc: 1,766; ada: 1,681; lex: 1,364; pascal: 1,264; cs: 879; exp: 527; php: 436; lisp: 258; ruby: 153; awk: 152; sed: 53; csh: 27
file content (117 lines) | stat: -rw-r--r-- 3,341 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
/* -*- 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 "mozilla/dom/WorkerCommon.h"

namespace mozilla {
namespace dom {

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

  ~Callback() {}

 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);
  }

  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 dom
}  // namespace mozilla