Refactor navigator.connect code to make it more flexible.

content/browser/navigator_connect/navigator_connect_context_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_H_
-#define CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_H_
+#ifndef CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_IMPL_H_
+#define CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_IMPL_H_
 
 #include <map>
-#include "base/memory/ref_counted.h"
-#include "content/common/service_worker/service_worker_status_code.h"
+#include "base/callback_forward.h"
+#include "base/memory/scoped_vector.h"
 #include "content/public/browser/message_port_delegate.h"
+#include "content/public/browser/navigator_connect_context.h"
 
 namespace content {
 
-struct CrossOriginServiceWorkerClient;
-class ServiceWorkerContextWrapper;
-class ServiceWorkerRegistration;
+struct NavigatorConnectClient;
+class NavigatorConnectService;
+class NavigatorConnectServiceFactory;
 
-// Tracks all active navigator.connect connections, wakes up service workers
-// when a message arrives, and routes the messages.
+// Tracks all active navigator.connect connections, as well as available service
+// factories. Delegates connection requests to the correct factory and passes
+// messages on to the correct service.
 // One instance of this class exists per StoragePartition.
-// TODO(mek): Clean up message ports when a service worker is unregistered.
 // TODO(mek): Somehow clean up connections when the client side goes away.
-class NavigatorConnectContext
-    : public MessagePortDelegate,
-      public base::RefCountedThreadSafe<NavigatorConnectContext> {
+class NavigatorConnectContextImpl : public NavigatorConnectContext {
  public:
-  explicit NavigatorConnectContext(
-      const scoped_refptr<ServiceWorkerContextWrapper>& service_worker_context);
+  using ConnectCallback = base::Callback<void(bool success)>;
 
-  // Registers an accepted connection and updates MessagePortService with the
-  // new route/delegate for the message port associated with this connection.
-  void RegisterConnection(const CrossOriginServiceWorkerClient& client,
-                          const scoped_refptr<ServiceWorkerRegistration>&
-                              service_worker_registration);
+  explicit NavigatorConnectContextImpl();
 
-  // MessagePortDelegate implementation. For the implementation of this class,
-  // the route_id of a message port is always equal to the message_port_id.
-  void SendMessage(int route_id,
-                   const base::string16& message,
-                   const std::vector<int>& sent_message_port_ids) override;
-  void SendMessagesAreQueued(int route_id) override;
+  // Called when a new connection request comes in from a client. Finds the
+  // correct service factory and passes the connection request off to there.
+  // Can call the callback before this method call returns.
+  void Connect(const NavigatorConnectClient& client,
+               const ConnectCallback& callback);
+
+  // NavigatorConnectContext implementation.
+  void AddFactory(scoped_ptr<NavigatorConnectServiceFactory> factory) override;
 
  private:
-  friend class base::RefCountedThreadSafe<NavigatorConnectContext>;
-  ~NavigatorConnectContext() override;
+  ~NavigatorConnectContextImpl() override;
 
-  // Callback called by SendMessage when a ServiceWorkerRegistration for the
-  // given message port has been located.
-  void DoSendMessage(const CrossOriginServiceWorkerClient& client,
-                     const base::string16& message,
-                     const std::vector<int>& sent_message_port_ids,
-                     ServiceWorkerStatusCode service_worker_status,
-                     const scoped_refptr<ServiceWorkerRegistration>&
-                         service_worker_registration);
+  // Callback called by service factories when a connection succeeded or failed.
+  void OnConnectResult(const NavigatorConnectClient& client,
+                       const ConnectCallback& callback,
+                       MessagePortDelegate* delegate);
 
-  scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
-  struct Connection;
-  // Maps route ids to connections. For the purpose of this class, the route id
-  // of a connection is the same as its message_port_id.
-  std::map<int, Connection> connections_;
+  // List of factories to try to handle URLs.
+  ScopedVector<NavigatorConnectServiceFactory> service_factories_;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_H_
+#endif  // CONTENT_BROWSER_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_CONTEXT_IMPL_H_