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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_dom_MessagePort_h
#define mozilla_dom_MessagePort_h
#include "mozilla/Attributes.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "nsAutoPtr.h"
#include "nsIIPCBackgroundChildCreateCallback.h"
#include "nsTArray.h"
#ifdef XP_WIN
#undef PostMessage
#endif
class nsIGlobalObject;
namespace mozilla {
namespace dom {
class MessagePortChild;
class MessagePortIdentifier;
class MessagePortMessage;
class PostMessageRunnable;
class SharedMessagePortMessage;
namespace workers {
class WorkerHolder;
} // namespace workers
class MessagePort final : public DOMEventTargetHelper
, public nsIIPCBackgroundChildCreateCallback
, public nsIObserver
{
friend class PostMessageRunnable;
public:
NS_DECL_NSIIPCBACKGROUNDCHILDCREATECALLBACK
NS_DECL_NSIOBSERVER
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MessagePort,
DOMEventTargetHelper)
static already_AddRefed<MessagePort>
Create(nsIGlobalObject* aGlobal, const nsID& aUUID,
const nsID& aDestinationUUID, ErrorResult& aRv);
static already_AddRefed<MessagePort>
Create(nsIGlobalObject* aGlobal,
const MessagePortIdentifier& aIdentifier,
ErrorResult& aRv);
// For IPC.
static void
ForceClose(const MessagePortIdentifier& aIdentifier);
virtual JSObject*
WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
void
PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Sequence<JSObject*>& aTransferable,
ErrorResult& aRv);
void Start();
void Close();
EventHandlerNonNull* GetOnmessage();
void SetOnmessage(EventHandlerNonNull* aCallback);
// Non WebIDL methods
void UnshippedEntangle(MessagePort* aEntangledPort);
void CloneAndDisentangle(MessagePortIdentifier& aIdentifier);
void CloseForced();
// These methods are useful for MessagePortChild
void Entangled(nsTArray<MessagePortMessage>& aMessages);
void MessagesReceived(nsTArray<MessagePortMessage>& aMessages);
void StopSendingDataConfirmed();
void Closed();
private:
explicit MessagePort(nsIGlobalObject* aGlobal);
~MessagePort();
enum State {
// When a port is created by a MessageChannel it is entangled with the
// other. They both run on the same thread, same event loop and the
// messages are added to the queues without using PBackground actors.
// When one of the port is shipped, the state is changed to
// StateEntangling.
eStateUnshippedEntangled,
// If the port is closed or cloned when we are in this state, we go in one
// of the following 2 steps. EntanglingForClose or ForDisentangle.
eStateEntangling,
// We are not fully entangled yet but are already disentangled.
eStateEntanglingForDisentangle,
// We are not fully entangled yet but are already closed.
eStateEntanglingForClose,
// When entangled() is received we send all the messages in the
// mMessagesForTheOtherPort to the actor and we change the state to
// StateEntangled. At this point the port is entangled with the other. We
// send and receive messages.
// If the port queue is not enabled, the received messages are stored in
// the mMessages.
eStateEntangled,
// When the port is cloned or disentangled we want to stop receiving
// messages. We call 'SendStopSendingData' to the actor and we wait for an
// answer. All the messages received between now and the
// 'StopSendingDataComfirmed are queued in the mMessages but not
// dispatched.
eStateDisentangling,
// When 'StopSendingDataConfirmed' is received, we can disentangle the port
// calling SendDisentangle in the actor because we are 100% sure that we
// don't receive any other message, so nothing will be lost.
// Disentangling the port we send all the messages from the mMessages
// though the actor.
eStateDisentangled,
// We are here if Close() has been called. We are disentangled but we can
// still send pending messages.
eStateDisentangledForClose
};
void Initialize(const nsID& aUUID, const nsID& aDestinationUUID,
uint32_t aSequenceID, bool mNeutered, State aState,
ErrorResult& aRv);
void ConnectToPBackground();
// Dispatch events from the Message Queue using a nsRunnable.
void Dispatch();
void StartDisentangling();
void Disentangle();
void RemoveDocFromBFCache();
void CloseInternal(bool aSoftly);
// This method is meant to keep alive the MessagePort when this object is
// creating the actor and until the actor is entangled.
// We release the object when the port is closed or disentangled.
void UpdateMustKeepAlive();
bool IsCertainlyAliveForCC() const override
{
return mIsKeptAlive;
}
nsAutoPtr<workers::WorkerHolder> mWorkerHolder;
RefPtr<PostMessageRunnable> mPostMessageRunnable;
RefPtr<MessagePortChild> mActor;
RefPtr<MessagePort> mUnshippedEntangledPort;
nsTArray<RefPtr<SharedMessagePortMessage>> mMessages;
nsTArray<RefPtr<SharedMessagePortMessage>> mMessagesForTheOtherPort;
nsAutoPtr<MessagePortIdentifier> mIdentifier;
uint64_t mInnerID;
State mState;
bool mMessageQueueEnabled;
bool mIsKeptAlive;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_MessagePort_h
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