Bug 1258602 - Part1: Add PresentationConnectionList, r=smaug

dom/presentation/PresentationCallbacks.cpp

@@ -50,8 +50,7 @@ PresentationRequesterCallback::NotifySuccess()
   // channel is ready. So we simply set the connection state as connected.
   RefPtr<PresentationConnection> connection =
     PresentationConnection::Create(mRequest->GetOwner(), mSessionId,
-                                   nsIPresentationService::ROLE_CONTROLLER,
+                                   nsIPresentationService::ROLE_CONTROLLER);
-                                   PresentationConnectionState::Connected);
   if (NS_WARN_IF(!connection)) {
     mPromise->MaybeReject(NS_ERROR_DOM_OPERATION_ERR);
     return NS_OK;

dom/presentation/PresentationConnection.cpp

@@ -13,6 +13,7 @@
 #include "nsServiceManagerUtils.h"
 #include "nsStringStream.h"
 #include "PresentationConnection.h"
+#include "PresentationConnectionList.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
@@ -20,10 +21,12 @@ using namespace mozilla::dom;
 NS_IMPL_CYCLE_COLLECTION_CLASS(PresentationConnection)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PresentationConnection, DOMEventTargetHelper)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwningConnectionList)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PresentationConnection, DOMEventTargetHelper)
   tmp->Shutdown();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwningConnectionList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_ADDREF_INHERITED(PresentationConnection, DOMEventTargetHelper)
@@ -36,10 +39,11 @@ NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
 PresentationConnection::PresentationConnection(nsPIDOMWindowInner* aWindow,
                                                const nsAString& aId,
                                                const uint8_t aRole,
-                                               PresentationConnectionState aState)
+                                               PresentationConnectionList* aList)
   : DOMEventTargetHelper(aWindow)
   , mId(aId)
-  , mState(aState)
+  , mState(PresentationConnectionState::Connecting)
+  , mOwningConnectionList(aList)
 {
   MOZ_ASSERT(aRole == nsIPresentationService::ROLE_CONTROLLER ||
              aRole == nsIPresentationService::ROLE_RECEIVER);
@@ -54,12 +58,12 @@ PresentationConnection::PresentationConnection(nsPIDOMWindowInner* aWindow,
 PresentationConnection::Create(nsPIDOMWindowInner* aWindow,
                                const nsAString& aId,
                                const uint8_t aRole,
-                               PresentationConnectionState aState)
+                               PresentationConnectionList* aList)
 {
   MOZ_ASSERT(aRole == nsIPresentationService::ROLE_CONTROLLER ||
              aRole == nsIPresentationService::ROLE_RECEIVER);
   RefPtr<PresentationConnection> connection =
-    new PresentationConnection(aWindow, aId, aRole, aState);
+    new PresentationConnection(aWindow, aId, aRole, aList);
   return NS_WARN_IF(!connection->Init()) ? nullptr : connection.forget();
 }
 
@@ -186,6 +190,9 @@ PresentationConnection::NotifyStateChange(const nsAString& aSessionId,
 
   PresentationConnectionState state;
   switch (aState) {
+    case nsIPresentationSessionListener::STATE_CONNECTING:
+      state = PresentationConnectionState::Connecting;
+      break;
     case nsIPresentationSessionListener::STATE_CONNECTED:
       state = PresentationConnectionState::Connected;
       break;
@@ -220,7 +227,16 @@ PresentationConnection::NotifyStateChange(const nsAString& aSessionId,
     }
   }
 
-  return DispatchStateChangeEvent();
+  nsresult rv = DispatchStateChangeEvent();
+  if(NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+  }
+
+  if (mOwningConnectionList) {
+    mOwningConnectionList->NotifyStateChange(aSessionId, this);
+  }
+
+  return NS_OK;
 }
 
 NS_IMETHODIMP

dom/presentation/PresentationConnection.h

@@ -14,6 +14,8 @@
 namespace mozilla {
 namespace dom {
 
+class PresentationConnectionList;
+
 class PresentationConnection final : public DOMEventTargetHelper
                                    , public nsIPresentationSessionListener
 {
@@ -23,10 +25,11 @@ public:
                                            DOMEventTargetHelper)
   NS_DECL_NSIPRESENTATIONSESSIONLISTENER
 
-  static already_AddRefed<PresentationConnection> Create(nsPIDOMWindowInner* aWindow,
+  static already_AddRefed<PresentationConnection>
-                                                         const nsAString& aId,
+  Create(nsPIDOMWindowInner* aWindow,
-                                                         const uint8_t aRole,
+         const nsAString& aId,
-                                                         PresentationConnectionState aState);
+         const uint8_t aRole,
+         PresentationConnectionList* aList = nullptr);
 
   virtual void DisconnectFromOwner() override;
 
@@ -52,7 +55,7 @@ private:
   PresentationConnection(nsPIDOMWindowInner* aWindow,
                          const nsAString& aId,
                          const uint8_t aRole,
-                         PresentationConnectionState aState);
+                         PresentationConnectionList* aList);
 
   ~PresentationConnection();
 
@@ -67,6 +70,7 @@ private:
   nsString mId;
   uint8_t mRole;
   PresentationConnectionState mState;
+  RefPtr<PresentationConnectionList> mOwningConnectionList;
 };
 
 } // namespace dom

dom/presentation/PresentationConnectionList.cpp

@@ -0,0 +1,125 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "PresentationConnectionList.h"
+
+#include "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/dom/PresentationConnectionAvailableEvent.h"
+#include "mozilla/dom/PresentationConnectionListBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "PresentationConnection.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(PresentationConnectionList, DOMEventTargetHelper,
+                                   mGetConnectionListPromise,
+                                   mConnections)
+
+NS_IMPL_ADDREF_INHERITED(PresentationConnectionList, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(PresentationConnectionList, DOMEventTargetHelper)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PresentationConnectionList)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+PresentationConnectionList::PresentationConnectionList(nsPIDOMWindowInner* aWindow,
+                                                       Promise* aPromise)
+  : DOMEventTargetHelper(aWindow)
+  , mGetConnectionListPromise(aPromise)
+{
+  MOZ_ASSERT(aWindow);
+  MOZ_ASSERT(aPromise);
+}
+
+/* virtual */ JSObject*
+PresentationConnectionList::WrapObject(JSContext* aCx,
+                                       JS::Handle<JSObject*> aGivenProto)
+{
+  return PresentationConnectionListBinding::Wrap(aCx, this, aGivenProto);
+}
+
+void
+PresentationConnectionList::GetConnections(
+  nsTArray<RefPtr<PresentationConnection>>& aConnections) const
+{
+  aConnections = mConnections;
+}
+
+nsresult
+PresentationConnectionList::DispatchConnectionAvailableEvent(
+  PresentationConnection* aConnection)
+{
+  PresentationConnectionAvailableEventInit init;
+  init.mConnection = aConnection;
+
+  RefPtr<PresentationConnectionAvailableEvent> event =
+    PresentationConnectionAvailableEvent::Constructor(
+      this,
+      NS_LITERAL_STRING("connectionavailable"),
+      init);
+
+  if (NS_WARN_IF(!event)) {
+    return NS_ERROR_FAILURE;
+  }
+  event->SetTrusted(true);
+
+  RefPtr<AsyncEventDispatcher> asyncDispatcher =
+    new AsyncEventDispatcher(this, event);
+  return asyncDispatcher->PostDOMEvent();
+}
+
+PresentationConnectionList::ConnectionArrayIndex
+PresentationConnectionList::FindConnectionById(
+  const nsAString& aId)
+{
+  for (ConnectionArrayIndex i = 0; i < mConnections.Length(); i++) {
+    nsAutoString id;
+    mConnections[i]->GetId(id);
+    if (id == nsAutoString(aId)) {
+      return i;
+    }
+  }
+
+  return mConnections.NoIndex;
+}
+
+void
+PresentationConnectionList::NotifyStateChange(const nsAString& aSessionId,
+                                              PresentationConnection* aConnection)
+{
+  if (!aConnection) {
+    MOZ_ASSERT(false, "PresentationConnection can not be null.");
+    return;
+  }
+
+  bool connectionFound =
+    FindConnectionById(aSessionId) != mConnections.NoIndex ? true : false;
+
+  PresentationConnectionListBinding::ClearCachedConnectionsValue(this);
+  switch (aConnection->State()) {
+    case PresentationConnectionState::Connected:
+      if (!connectionFound) {
+        mConnections.AppendElement(aConnection);
+        if (mGetConnectionListPromise) {
+          mGetConnectionListPromise->MaybeResolve(this);
+          mGetConnectionListPromise = nullptr;
+          return;
+        }
+      }
+      DispatchConnectionAvailableEvent(aConnection);
+      break;
+    case PresentationConnectionState::Terminated:
+      if (connectionFound) {
+        mConnections.RemoveElement(aConnection);
+      }
+      break;
+    default:
+      break;
+    }
+}
+
+} // namespace dom
+} // namespace mozilla

dom/presentation/PresentationConnectionList.h

@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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_PresentationConnectionList_h
+#define mozilla_dom_PresentationConnectionList_h
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace dom {
+
+class PresentationConnection;
+class Promise;
+
+class PresentationConnectionList final : public DOMEventTargetHelper
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PresentationConnectionList,
+                                           DOMEventTargetHelper)
+
+  PresentationConnectionList(nsPIDOMWindowInner* aWindow,
+                             Promise* aPromise);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetConnections(nsTArray<RefPtr<PresentationConnection>>& aConnections) const;
+
+  void NotifyStateChange(const nsAString& aSessionId, PresentationConnection* aConnection);
+
+  IMPL_EVENT_HANDLER(connectionavailable);
+
+private:
+  virtual ~PresentationConnectionList() = default;
+
+  nsresult DispatchConnectionAvailableEvent(PresentationConnection* aConnection);
+
+  typedef nsTArray<RefPtr<PresentationConnection>> ConnectionArray;
+  typedef ConnectionArray::index_type ConnectionArrayIndex;
+
+  ConnectionArrayIndex FindConnectionById(const nsAString& aId);
+
+  RefPtr<Promise> mGetConnectionListPromise;
+
+  // This array stores only non-terminsted connections.
+  ConnectionArray mConnections;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PresentationConnectionList_h

dom/presentation/PresentationReceiver.cpp

@@ -4,37 +4,31 @@
  * 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 "mozilla/AsyncEventDispatcher.h"
+#include "PresentationReceiver.h"
+
 #include "mozilla/dom/PresentationReceiverBinding.h"
 #include "mozilla/dom/Promise.h"
-#include "nsCycleCollectionParticipant.h"
 #include "nsIPresentationService.h"
 #include "nsServiceManagerUtils.h"
-#include "PresentationReceiver.h"
+#include "nsThreadUtils.h"
 #include "PresentationConnection.h"
+#include "PresentationConnectionList.h"
 
-using namespace mozilla;
+namespace mozilla {
-using namespace mozilla::dom;
+namespace dom {
 
-NS_IMPL_CYCLE_COLLECTION_CLASS(PresentationReceiver)
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PresentationReceiver,
+                                      mOwner,
+                                      mGetConnectionListPromise,
+                                      mConnectionList)
 
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PresentationReceiver, DOMEventTargetHelper)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PresentationReceiver)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mConnections)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PresentationReceiver)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPendingGetConnectionPromises)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PresentationReceiver, DOMEventTargetHelper)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PresentationReceiver)
-  tmp->Shutdown();
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mConnections)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mPendingGetConnectionPromises)
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_ADDREF_INHERITED(PresentationReceiver, DOMEventTargetHelper)
-NS_IMPL_RELEASE_INHERITED(PresentationReceiver, DOMEventTargetHelper)
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PresentationReceiver)
   NS_INTERFACE_MAP_ENTRY(nsIPresentationRespondingListener)
-NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+NS_INTERFACE_MAP_END
 
 /* static */ already_AddRefed<PresentationReceiver>
 PresentationReceiver::Create(nsPIDOMWindowInner* aWindow)
@@ -44,8 +38,9 @@ PresentationReceiver::Create(nsPIDOMWindowInner* aWindow)
 }
 
 PresentationReceiver::PresentationReceiver(nsPIDOMWindowInner* aWindow)
-  : DOMEventTargetHelper(aWindow)
+  : mOwner(aWindow)
 {
+  MOZ_ASSERT(aWindow);
 }
 
 PresentationReceiver::~PresentationReceiver()
@@ -56,31 +51,16 @@ PresentationReceiver::~PresentationReceiver()
 bool
 PresentationReceiver::Init()
 {
-  if (NS_WARN_IF(!GetOwner())) {
+  if (NS_WARN_IF(!mOwner)) {
-    return false;
-  }
-  mWindowId = GetOwner()->WindowID();
-
-  nsCOMPtr<nsIPresentationService> service =
-    do_GetService(PRESENTATION_SERVICE_CONTRACTID);
-  if (NS_WARN_IF(!service)) {
-    return false;
-  }
-
-  // Register listener for incoming sessions.
-  nsresult rv = service->RegisterRespondingListener(mWindowId, this);
-  if (NS_WARN_IF(NS_FAILED(rv))) {
     return false;
   }
+  mWindowId = mOwner->WindowID();
 
   return true;
 }
 
 void PresentationReceiver::Shutdown()
 {
-  mConnections.Clear();
-  mPendingGetConnectionPromises.Clear();
-
   // Unregister listener for incoming sessions.
   nsCOMPtr<nsIPresentationService> service =
     do_GetService(PRESENTATION_SERVICE_CONTRACTID);
@@ -92,13 +72,6 @@ void PresentationReceiver::Shutdown()
   NS_WARN_IF(NS_FAILED(rv));
 }
 
-/* virtual */ void
-PresentationReceiver::DisconnectFromOwner()
-{
-  Shutdown();
-  DOMEventTargetHelper::DisconnectFromOwner();
-}
-
 /* virtual */ JSObject*
 PresentationReceiver::WrapObject(JSContext* aCx,
                                  JS::Handle<JSObject*> aGivenProto)
@@ -106,86 +79,88 @@ PresentationReceiver::WrapObject(JSContext* aCx,
   return PresentationReceiverBinding::Wrap(aCx, this, aGivenProto);
 }
 
-already_AddRefed<Promise>
-PresentationReceiver::GetConnection(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetOwner());
-  if (NS_WARN_IF(!global)) {
-    aRv.Throw(NS_ERROR_UNEXPECTED);
-    return nullptr;
-  }
-
-  RefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (NS_WARN_IF(aRv.Failed())) {
-    return nullptr;
-  }
-
-  // If there's no existing connection, leave the promise pending until a
-  // connecting request arrives from the controlling browsing context (sender).
-  // http://w3c.github.io/presentation-api/#dom-presentation-getconnection
-  if (!mConnections.IsEmpty()) {
-    promise->MaybeResolve(mConnections[0]);
-  } else {
-    mPendingGetConnectionPromises.AppendElement(promise);
-  }
-
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-PresentationReceiver::GetConnections(ErrorResult& aRv) const
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetOwner());
-  if (NS_WARN_IF(!global)) {
-    aRv.Throw(NS_ERROR_UNEXPECTED);
-    return nullptr;
-  }
-
-  RefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (NS_WARN_IF(aRv.Failed())) {
-    return nullptr;
-  }
-
-  promise->MaybeResolve(mConnections);
-  return promise.forget();
-}
-
 NS_IMETHODIMP
 PresentationReceiver::NotifySessionConnect(uint64_t aWindowId,
                                            const nsAString& aSessionId)
 {
-  if (NS_WARN_IF(!GetOwner())) {
+  if (NS_WARN_IF(!mOwner)) {
     return NS_ERROR_FAILURE;
   }
 
-  if (NS_WARN_IF(aWindowId != GetOwner()->WindowID())) {
+  if (NS_WARN_IF(aWindowId != mWindowId)) {
     return NS_ERROR_INVALID_ARG;
   }
 
+  if (NS_WARN_IF(!mConnectionList)) {
+    return NS_ERROR_FAILURE;
+  }
+
   RefPtr<PresentationConnection> connection =
-    PresentationConnection::Create(GetOwner(), aSessionId,
+    PresentationConnection::Create(mOwner, aSessionId,
                                    nsIPresentationService::ROLE_RECEIVER,
-                                   PresentationConnectionState::Closed);
+                                   mConnectionList);
   if (NS_WARN_IF(!connection)) {
     return NS_ERROR_NOT_AVAILABLE;
   }
-  mConnections.AppendElement(connection);
 
-  // Resolve pending |GetConnection| promises if any.
+  return NS_OK;
-  if (!mPendingGetConnectionPromises.IsEmpty()) {
+}
-    for(uint32_t i = 0; i < mPendingGetConnectionPromises.Length(); i++) {
+
-      mPendingGetConnectionPromises[i]->MaybeResolve(connection);
+already_AddRefed<Promise>
-    }
+PresentationReceiver::GetConnectionList(ErrorResult& aRv)
-    mPendingGetConnectionPromises.Clear();
+{
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(mOwner);
+  if (NS_WARN_IF(!global)) {
+    aRv.Throw(NS_ERROR_UNEXPECTED);
+    return nullptr;
   }
 
-  return DispatchConnectionAvailableEvent();
+  if (!mGetConnectionListPromise) {
+    mGetConnectionListPromise = Promise::Create(global, aRv);
+    if (NS_WARN_IF(aRv.Failed())) {
+      return nullptr;
+    }
+
+    RefPtr<PresentationReceiver> self = this;
+    nsresult rv =
+      NS_DispatchToMainThread(NS_NewRunnableFunction([self] () -> void {
+        self->CreateConnectionList();
+      }));
+    if (NS_FAILED(rv)) {
+      aRv.Throw(rv);
+      return nullptr;
+    }
+  }
+
+  RefPtr<Promise> promise = mGetConnectionListPromise;
+  return promise.forget();
 }
 
-nsresult
+void
-PresentationReceiver::DispatchConnectionAvailableEvent()
+PresentationReceiver::CreateConnectionList()
 {
-  RefPtr<AsyncEventDispatcher> asyncDispatcher =
+  MOZ_ASSERT(mGetConnectionListPromise);
-    new AsyncEventDispatcher(this, NS_LITERAL_STRING("connectionavailable"), false);
+
-  return asyncDispatcher->PostDOMEvent();
+  if (mConnectionList) {
+    return;
+  }
+
+  mConnectionList = new PresentationConnectionList(mOwner,
+                                                   mGetConnectionListPromise);
+
+  // Register listener for incoming sessions.
+  nsCOMPtr<nsIPresentationService> service =
+    do_GetService(PRESENTATION_SERVICE_CONTRACTID);
+  if (NS_WARN_IF(!service)) {
+    mGetConnectionListPromise->MaybeReject(NS_ERROR_DOM_OPERATION_ERR);
+    return;
+  }
+
+  nsresult rv = service->RegisterRespondingListener(mWindowId, this);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    mGetConnectionListPromise->MaybeReject(rv);
+  }
 }
+
+} // namespace dom
+} // namespace mozilla

dom/presentation/PresentationReceiver.h

@@ -7,55 +7,55 @@
 #ifndef mozilla_dom_PresentationReceiver_h
 #define mozilla_dom_PresentationReceiver_h
 
-#include "mozilla/DOMEventTargetHelper.h"
+#include "nsCycleCollectionParticipant.h"
 #include "nsIPresentationListener.h"
 
 namespace mozilla {
 namespace dom {
 
-class Promise;
 class PresentationConnection;
+class PresentationConnectionList;
+class Promise;
 
-class PresentationReceiver final : public DOMEventTargetHelper
+class PresentationReceiver final : public nsIPresentationRespondingListener
-                                 , public nsIPresentationRespondingListener
+                                 , public nsWrapperCache
 {
 public:
-  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PresentationReceiver,
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(PresentationReceiver)
-                                           DOMEventTargetHelper)
   NS_DECL_NSIPRESENTATIONRESPONDINGLISTENER
 
   static already_AddRefed<PresentationReceiver> Create(nsPIDOMWindowInner* aWindow);
 
-  virtual void DisconnectFromOwner() override;
-
   virtual JSObject* WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) override;
 
+  nsISupports* GetParentObject() const
+  {
+    return mOwner;
+  }
+
   // WebIDL (public APIs)
-  already_AddRefed<Promise> GetConnection(ErrorResult& aRv);
+  already_AddRefed<Promise> GetConnectionList(ErrorResult& aRv);
-
-  already_AddRefed<Promise> GetConnections(ErrorResult& aRv) const;
-
-  IMPL_EVENT_HANDLER(connectionavailable);
 
 private:
   explicit PresentationReceiver(nsPIDOMWindowInner* aWindow);
 
-  ~PresentationReceiver();
+  virtual ~PresentationReceiver();
 
   bool Init();
 
   void Shutdown();
 
-  nsresult DispatchConnectionAvailableEvent();
+  void CreateConnectionList();
 
   // Store the inner window ID for |UnregisterRespondingListener| call in
   // |Shutdown| since the inner window may not exist at that moment.
   uint64_t mWindowId;
 
-  nsTArray<RefPtr<PresentationConnection>> mConnections;
+  nsCOMPtr<nsPIDOMWindowInner> mOwner;
-  nsTArray<RefPtr<Promise>> mPendingGetConnectionPromises;
+  RefPtr<Promise> mGetConnectionListPromise;
+  RefPtr<PresentationConnectionList> mConnectionList;
 };
 
 } // namespace dom

dom/presentation/PresentationSessionInfo.h

@@ -44,7 +44,7 @@ public:
     , mSessionId(aSessionId)
     , mIsResponderReady(false)
     , mIsTransportReady(false)
-    , mState(nsIPresentationSessionListener::STATE_CLOSED)
+    , mState(nsIPresentationSessionListener::STATE_CONNECTING)
     , mCallback(aCallback)
   {
     MOZ_ASSERT(!mUrl.IsEmpty());

dom/presentation/interfaces/nsIPresentationListener.idl

@@ -16,9 +16,10 @@ interface nsIPresentationAvailabilityListener : nsISupports
 [scriptable, uuid(7dd48df8-8f8c-48c7-ac37-7b9fd1acf2f8)]
 interface nsIPresentationSessionListener : nsISupports
 {
-  const unsigned short STATE_CONNECTED = 0;
+  const unsigned short STATE_CONNECTING = 0;
-  const unsigned short STATE_CLOSED = 1;
+  const unsigned short STATE_CONNECTED = 1;
-  const unsigned short STATE_TERMINATED = 2;
+  const unsigned short STATE_CLOSED = 2;
+  const unsigned short STATE_TERMINATED = 3;
 
   /*
    * Called when session state changes.

dom/presentation/moz.build

@@ -18,6 +18,7 @@ EXPORTS.mozilla.dom += [
     'PresentationAvailability.h',
     'PresentationCallbacks.h',
     'PresentationConnection.h',
+    'PresentationConnectionList.h',
     'PresentationDeviceManager.h',
     'PresentationReceiver.h',
     'PresentationRequest.h',
@@ -35,6 +36,7 @@ UNIFIED_SOURCES += [
     'PresentationAvailability.cpp',
     'PresentationCallbacks.cpp',
     'PresentationConnection.cpp',
+    'PresentationConnectionList.cpp',
     'PresentationDeviceManager.cpp',
     'PresentationReceiver.cpp',
     'PresentationRequest.cpp',

dom/webidl/PresentationConnection.webidl

@@ -6,6 +6,9 @@
 
 enum PresentationConnectionState
 {
+  // The initial state when a PresentationConnection is ceated.
+  "connecting",
+
   // Existing presentation, and the communication channel is active.
   "connected",
 

dom/webidl/PresentationConnectionList.webidl

@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; 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/.
+ */
+
+[Pref="dom.presentation.enabled",
+ Func="Navigator::HasPresentationSupport"]
+interface PresentationConnectionList : EventTarget {
+  /*
+   * Return the non-terminated set of presentation connections in the
+   * set of presentation controllers.
+   * TODO: Use FrozenArray once available. (Bug 1236777)
+   * readonly attribute FrozenArray<PresentationConnection> connections;
+   */
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<PresentationConnection> connections;
+
+  /*
+   * It is called when an incoming connection is connected.
+   */
+  attribute EventHandler onconnectionavailable;
+};

dom/webidl/PresentationReceiver.webidl

@@ -6,22 +6,11 @@
 
 [Pref="dom.presentation.enabled",
  Func="Navigator::HasPresentationSupport"]
-interface PresentationReceiver : EventTarget {
+interface PresentationReceiver {
   /*
-   * Get the first connected presentation connection in a receiving browsing
+   * Get a list which contains all connected presentation connections
-   * context.
+   * in a receiving browsing context.
    */
-  [Throws]
+  [SameObject, Throws]
-  Promise<PresentationConnection> getConnection();
+  readonly attribute Promise<PresentationConnectionList> connectionList;
-
+};
-  /*
-   * Get all connected presentation connections in a receiving browsing context.
-   */
-  [Throws]
-  Promise<sequence<PresentationConnection>> getConnections();
-
-  /*
-   * It is called when an incoming connection is connecting.
-   */
-  attribute EventHandler onconnectionavailable;
-};

dom/webidl/moz.build

@@ -378,6 +378,7 @@ WEBIDL_FILES = [
     'Presentation.webidl',
     'PresentationAvailability.webidl',
     'PresentationConnection.webidl',
+    'PresentationConnectionList.webidl',
     'PresentationDeviceInfoManager.webidl',
     'PresentationReceiver.webidl',
     'PresentationRequest.webidl',