[Presentation API] (5th) (1-UA) integrate controller and receiver side for 1-UA messaging

chrome/browser/media/router/browser_presentation_connection_proxy.h

+// Copyright 2016 The Chromium Authors. All rights reserved.

[mark a. foltz, 2017/01/23 22:29:34]

2017 here and elsewhere in new files :)

[zhaobin, 2017/01/24 19:28:46]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_BROWSER_PRESENTATION_CONNECTION_PROXY_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_BROWSER_PRESENTATION_CONNECTION_PROXY_H_
+
+#include "content/public/browser/presentation_service_delegate.h"
+#include "content/public/common/presentation_session.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace media_router {
+
+class MediaRouter;
+class MediaRoute;
+
+using OnMessageCallback = base::Callback<void(bool)>;
+
+// This class represents a browser side PresentationConnection. It connects with
+// PresentationConnection owned by a render frame to enable message exchange.
+// Message received on this class is further routed to media router. State of
+// browser side PresentationConnection is always 'connected'.
+//
+// |SetTargetConnection| sets |target_connection_| to mojo handle of
+// PresentationConnection object owned a render frame, and transits state of
+// |target_connection_| to 'connected'.
+//
+// Send message from page to media router:
+// PresentationConnection::sendString();
+//     -> PresentationDispatcher::DoSendMessage();
+//         -> PresentationConnectionProxy::SendSessionMessage();
+//             --> (mojo call to browser side PresentationConnection)
+//                 -> BrowserPresentationConnectionProxy::OnMessage();
+//                      -> MediaRouter::SendRouteMessage();
+//
+// Instance of this class is only created for remotely rendered presentations.
+// It is owned by PresentationFrame. When PresentationFrame gets destroyed,
+// instance of this class will also be destroyed.

[mark a. foltz, 2017/01/23 22:29:34]

How does the lifetime of this class relate to the lifetime of the media route? 
The route could be terminated while the frame is still alive.

[zhaobin, 2017/01/24 19:28:46]

Object will be destroyed if |route_| is closed or terminated.

+
+class BrowserPresentationConnectionProxy
+    : public NON_EXPORTED_BASE(blink::mojom::PresentationConnection) {
+ public:
+  BrowserPresentationConnectionProxy(const content::PresentationSessionInfo&,
+                                     MediaRouter* router,
+                                     MediaRoute* route);
+  ~BrowserPresentationConnectionProxy() override;
+
+  void Bind(blink::mojom::PresentationConnectionRequest);
+  void SetTargetConnection(blink::mojom::PresentationConnectionPtr connection);
+
+  // blink::mojom::PresentationConnection implementation
+  void OnMessage(blink::mojom::ConnectionMessagePtr message,
+                 const OnMessageCallback& callback) override;
+  void DidChangeState(
+      blink::mojom::PresentationConnectionState state) override {}
+
+ private:
+  content::PresentationSessionInfo session_info_;
+
+  // |router_| not owned by this class.
+  MediaRouter* router_;
+  // |route_| not owned by this class.
+  MediaRoute* route_;
+
+  mojo::Binding<blink::mojom::PresentationConnection> binding_;
+  blink::mojom::PresentationConnectionPtr target_connection_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_BROWSER_PRESENTATION_CONNECTION_PROXY_H_