gecko-dev/dom/workers/SharedWorker.cpp

232 lines
5.5 KiB
C++

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* 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 "SharedWorker.h"
#include "nsPIDOMWindow.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/SharedWorkerBinding.h"
#include "nsContentUtils.h"
#include "nsDOMEvent.h"
#include "nsEventDispatcher.h"
#include "nsIClassInfoImpl.h"
#include "MessagePort.h"
#include "RuntimeService.h"
#include "WorkerPrivate.h"
using mozilla::dom::Optional;
using mozilla::dom::Sequence;
USING_WORKERS_NAMESPACE
namespace {
const char kSharedWorkersEnabledPref[] = "dom.workers.sharedWorkers.enabled";
} // anonymous namespace
SharedWorker::SharedWorker(nsPIDOMWindow* aWindow,
WorkerPrivate* aWorkerPrivate)
: nsDOMEventTargetHelper(aWindow), mWorkerPrivate(aWorkerPrivate),
mSuspended(false)
{
AssertIsOnMainThread();
MOZ_ASSERT(aWorkerPrivate);
mSerial = aWorkerPrivate->NextMessagePortSerial();
mMessagePort = new MessagePort(aWindow, this, mSerial);
}
SharedWorker::~SharedWorker()
{
AssertIsOnMainThread();
MOZ_ASSERT(!mWorkerPrivate);
}
//static
bool
SharedWorker::PrefEnabled()
{
AssertIsOnMainThread();
return mozilla::Preferences::GetBool(kSharedWorkersEnabledPref, false);
}
// static
already_AddRefed<SharedWorker>
SharedWorker::Constructor(const GlobalObject& aGlobal, JSContext* aCx,
const nsAString& aScriptURL,
const mozilla::dom::Optional<nsAString>& aName,
ErrorResult& aRv)
{
AssertIsOnMainThread();
RuntimeService* rts = RuntimeService::GetOrCreateService();
if (!rts) {
aRv = NS_ERROR_NOT_AVAILABLE;
return nullptr;
}
nsString name;
if (aName.WasPassed()) {
name = aName.Value();
}
nsRefPtr<SharedWorker> sharedWorker;
nsresult rv = rts->CreateSharedWorker(aGlobal, aScriptURL, name,
getter_AddRefs(sharedWorker));
if (NS_FAILED(rv)) {
aRv = rv;
return nullptr;
}
return sharedWorker.forget();
}
already_AddRefed<MessagePort>
SharedWorker::Port()
{
AssertIsOnMainThread();
nsRefPtr<MessagePort> messagePort = mMessagePort;
return messagePort.forget();
}
void
SharedWorker::Suspend()
{
AssertIsOnMainThread();
MOZ_ASSERT(!IsSuspended());
mSuspended = true;
}
void
SharedWorker::Resume()
{
AssertIsOnMainThread();
MOZ_ASSERT(IsSuspended());
mSuspended = false;
if (!mSuspendedEvents.IsEmpty()) {
nsTArray<nsCOMPtr<nsIDOMEvent>> events;
mSuspendedEvents.SwapElements(events);
for (uint32_t index = 0; index < events.Length(); index++) {
nsCOMPtr<nsIDOMEvent>& event = events[index];
MOZ_ASSERT(event);
nsCOMPtr<nsIDOMEventTarget> target;
if (NS_SUCCEEDED(event->GetTarget(getter_AddRefs(target)))) {
bool ignored;
if (NS_FAILED(target->DispatchEvent(event, &ignored))) {
NS_WARNING("Failed to dispatch event!");
}
} else {
NS_WARNING("Failed to get target!");
}
}
}
}
void
SharedWorker::QueueEvent(nsIDOMEvent* aEvent)
{
AssertIsOnMainThread();
MOZ_ASSERT(aEvent);
MOZ_ASSERT(IsSuspended());
mSuspendedEvents.AppendElement(aEvent);
}
void
SharedWorker::Close()
{
AssertIsOnMainThread();
if (mMessagePort) {
mMessagePort->Close();
}
if (mWorkerPrivate) {
AutoSafeJSContext cx;
NoteDeadWorker(cx);
}
}
void
SharedWorker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Optional<Sequence<JS::Value>>& aTransferable,
ErrorResult& aRv)
{
AssertIsOnMainThread();
MOZ_ASSERT(mWorkerPrivate);
MOZ_ASSERT(mMessagePort);
mWorkerPrivate->PostMessageToMessagePort(aCx, mMessagePort->Serial(),
aMessage, aTransferable, aRv);
}
void
SharedWorker::NoteDeadWorker(JSContext* aCx)
{
AssertIsOnMainThread();
MOZ_ASSERT(mWorkerPrivate);
mWorkerPrivate->UnregisterSharedWorker(aCx, this);
mWorkerPrivate = nullptr;
}
NS_IMPL_ADDREF_INHERITED(SharedWorker, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(SharedWorker, nsDOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(SharedWorker)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_CLASS(SharedWorker)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SharedWorker,
nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMessagePort)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSuspendedEvents)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SharedWorker,
nsDOMEventTargetHelper)
tmp->Close();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessagePort)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSuspendedEvents)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
JSObject*
SharedWorker::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
{
AssertIsOnMainThread();
return SharedWorkerBinding::Wrap(aCx, aScope, this);
}
nsresult
SharedWorker::PreHandleEvent(nsEventChainPreVisitor& aVisitor)
{
AssertIsOnMainThread();
nsIDOMEvent*& event = aVisitor.mDOMEvent;
if (IsSuspended() && event) {
QueueEvent(event);
aVisitor.mCanHandle = false;
aVisitor.mParentTarget = nullptr;
return NS_OK;
}
return nsDOMEventTargetHelper::PreHandleEvent(aVisitor);
}