Pass ServiceProvider thru ViewManagerService::Embed() allowing embedder & embeddee to expose servic…

mojo/public/cpp/application/service_provider_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 MOJO_PUBLIC_APPLICATION_SERVICE_PROVIDER_IMPL_H_
+#define MOJO_PUBLIC_APPLICATION_SERVICE_PROVIDER_IMPL_H_
+
+#include "mojo/public/cpp/application/lib/service_connector.h"
+#include "mojo/public/interfaces/application/service_provider.mojom.h"
+
+namespace mojo {
+namespace internal {
+class WeakServiceProvider;
+class ServiceConnectorBase;
+}
+
+// Implements a registry that can be used to expose services to another app.
+class ServiceProviderImpl : public InterfaceImpl<ServiceProvider> {
+ public:
+  ServiceProviderImpl();
+  virtual ~ServiceProviderImpl();
+
+  template <typename Interface>
+  void AddService(InterfaceFactory<Interface>* factory) {
+    AddServiceConnector(
+        new internal::InterfaceFactoryConnector<Interface>(factory));
+  }
+
+  // Returns an instance of a ServiceProvider that weakly wraps this impl's
+  // connection to some other app. Whereas the lifetime of an instance of
+  // ServiceProviderImpl is bound to the lifetime of the pipe it
+  // encapsulates, the lifetime of the ServiceProvider instance returned by this
+  // method is assumed by the caller. After the pipe is closed
+  // ConnectToService() calls on this object will be silently dropped.
+  // This method must only be called once per ServiceProviderImpl.
+  ServiceProvider* CreateRemoteServiceProvider();
+
+ private:
+  typedef std::map<std::string, internal::ServiceConnectorBase*>
+      NameToServiceConnectorMap;
+
+  // Overridden from ServiceProvider:
+  virtual void ConnectToService(
+      const String& service_name,
+      ScopedMessagePipeHandle client_handle) MOJO_OVERRIDE;
+
+  // Overridden from InterfaceImpl:
+  virtual void OnConnectionError() MOJO_OVERRIDE;
+
+  void AddServiceConnector(
+      internal::ServiceConnectorBase* service_connector);
+  void RemoveServiceConnector(
+      internal::ServiceConnectorBase* service_connector);
+
+  NameToServiceConnectorMap service_connectors_;
+
+  internal::WeakServiceProvider* remote_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ServiceProviderImpl);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_APPLICATION_SERVICE_PROVIDER_IMPL_H_