Mojo: Use InterfaceFactory<Interface> for service registration

mojo/services/network/main.cc

 // 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.
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/application/application_connection.h"
@@ skipping 14 matching lines @@
 #elif defined(OS_WIN)
   *path = base::FilePath::FromUTF8Unsafe(path_as_string);
 #else
 #error Not implemented
 #endif
 }
 
 }  // namespace
 
 class Delegate : public mojo::ApplicationDelegate {
+  typedef mojo::ContextInterfaceProvider<mojo::NetworkServiceImpl,
+                                         mojo::NetworkContext,
+                                         mojo::NetworkService> NetworkProvider;
+
  public:
   Delegate() {}
 
   virtual void Initialize(mojo::ApplicationImpl* app) MOJO_OVERRIDE {
     mojo::InterfacePtr<mojo::ProfileService> profile_service;
     app->ConnectToService("mojo:profile_service", &profile_service);
     base::FilePath base_path;
     profile_service->GetPath(mojo::ProfileService::DIR_TEMP,
                              base::Bind(&OnPathReceived,
                                         base::Unretained(&base_path)));
     profile_service.WaitForIncomingMethodCall();
     DCHECK(!base_path.value().empty());
     base_path = base_path.Append(FILE_PATH_LITERAL("network_service"));
     context_.reset(new mojo::NetworkContext(base_path));
+    network_service_provider_.reset(new NetworkProvider(context_.get()));
   }
 
+  // mojo::ApplicationDelegate implementation.
   virtual bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) MOJO_OVERRIDE {
     DCHECK(context_);
-    connection->AddService<mojo::NetworkServiceImpl>(context_.get());
+    connection->AddServiceProvider(network_service_provider_.get());

[jamesr, 2014/07/11 20:07:10]

here, instead of implementing InterfaceProvider<>::BindToRequest explicitly this
class allocates a ContextInterfaceProvider which allocates + binds instances of
NetworkServiceImpls. i'm doing this as a member in order to allocate it when the
context becomes available

     return true;
   }
 
  private:
   scoped_ptr<mojo::NetworkContext> context_;
+  scoped_ptr<NetworkProvider> network_service_provider_;
 };
 
 extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
     MojoHandle shell_handle) {
   base::CommandLine::Init(0, NULL);
   base::AtExitManager at_exit;
 
   // The IO message loop allows us to use net::URLRequest on this thread.
   base::MessageLoopForIO loop;
 
   Delegate delegate;
   mojo::ApplicationImpl app(
       &delegate, mojo::MakeScopedHandle(mojo::MessagePipeHandle(shell_handle)));
 
   loop.Run();
   return MOJO_RESULT_OK;
 }