gecko-dev/dom/workers/WorkerHolderToken.cpp

117 строки
3.1 KiB
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 "WorkerHolderToken.h"
#include "WorkerPrivate.h"
namespace mozilla {
namespace dom {
// static
already_AddRefed<WorkerHolderToken>
WorkerHolderToken::Create(WorkerPrivate* aWorkerPrivate,
WorkerStatus aShutdownStatus,
Behavior aBehavior)
{
MOZ_DIAGNOSTIC_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
RefPtr<WorkerHolderToken> workerHolder =
new WorkerHolderToken(aShutdownStatus, aBehavior);
if (NS_WARN_IF(!workerHolder->HoldWorker(aWorkerPrivate, aShutdownStatus))) {
return nullptr;
}
return workerHolder.forget();
}
void
WorkerHolderToken::AddListener(Listener* aListener)
{
NS_ASSERT_OWNINGTHREAD(WorkerHolderToken);
MOZ_ASSERT(aListener);
MOZ_ASSERT(!mListenerList.Contains(aListener));
mListenerList.AppendElement(aListener);
// Allow an actor to be added after we've entered the Notifying case. We
// can't stop the actor creation from racing with out destruction of the
// other actors and we need to wait for this extra one to close as well.
// Signal it should destroy itself right away.
if (mShuttingDown) {
aListener->WorkerShuttingDown();
}
}
void
WorkerHolderToken::RemoveListener(Listener* aListener)
{
NS_ASSERT_OWNINGTHREAD(WorkerHolderToken);
MOZ_ASSERT(aListener);
DebugOnly<bool> removed = mListenerList.RemoveElement(aListener);
MOZ_ASSERT(removed);
MOZ_ASSERT(!mListenerList.Contains(aListener));
}
bool
WorkerHolderToken::IsShuttingDown() const
{
return mShuttingDown;
}
WorkerPrivate*
WorkerHolderToken::GetWorkerPrivate() const
{
NS_ASSERT_OWNINGTHREAD(WorkerHolderToken);
return mWorkerPrivate;
}
WorkerHolderToken::WorkerHolderToken(WorkerStatus aShutdownStatus,
Behavior aBehavior)
: WorkerHolder("WorkerHolderToken", aBehavior)
, mShutdownStatus(aShutdownStatus)
, mShuttingDown(false)
{
}
WorkerHolderToken::~WorkerHolderToken()
{
NS_ASSERT_OWNINGTHREAD(WorkerHolderToken);
MOZ_ASSERT(mListenerList.IsEmpty());
}
bool
WorkerHolderToken::Notify(WorkerStatus aStatus)
{
NS_ASSERT_OWNINGTHREAD(WorkerHolderToken);
// When the service worker thread is stopped we will get Canceling,
// but nothing higher than that. We must shut things down at Canceling.
if (aStatus < mShutdownStatus || mShuttingDown) {
return true;
}
// Start the asynchronous destruction of our actors. These will call back
// into RemoveActor() once the actor is destroyed.
nsTObserverArray<Listener*>::ForwardIterator iter(mListenerList);
while (iter.HasMore()) {
iter.GetNext()->WorkerShuttingDown();
}
// Set this after calling WorkerShuttingDown() on listener list in case
// one callback triggers another listener to be added.
mShuttingDown = true;
return true;
}
} // dom namespace
} // mozilla namespace