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-rw-r--r--dom/workers/ServiceWorkerJobQueue.cpp134
1 files changed, 134 insertions, 0 deletions
diff --git a/dom/workers/ServiceWorkerJobQueue.cpp b/dom/workers/ServiceWorkerJobQueue.cpp
new file mode 100644
index 000000000..15a798a4d
--- /dev/null
+++ b/dom/workers/ServiceWorkerJobQueue.cpp
@@ -0,0 +1,134 @@
+/* -*- 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