content/public/common/service_registry.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_
   6 #define CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_
   7
   8 #include <string>
   9
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/strings/string_piece.h"
  13 #include "content/common/content_export.h"
  14 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_ptr.h"
  15 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
  16 #include "third_party/mojo/src/mojo/public/cpp/system/core.h"
  17
  18 namespace content {
  19
  20 // A ServiceRegistry exposes local services that have been added using
  21 // AddService to a paired remote ServiceRegistry and provides local access to
  22 // services exposed by the remote ServiceRegistry through
  23 // ConnectToRemoteService.
  24 class CONTENT_EXPORT ServiceRegistry {
  25  public:
  26   virtual ~ServiceRegistry() {}
  27
  28   // Make the service created by |service_factory| available to the remote
  29   // ServiceProvider. In response to each request for a service,
  30   // |service_factory| will be run with an InterfaceRequest<Interface>
  31   // representing that request. Adding a factory for an already registered
  32   // service will override the factory. Existing connections to the service are
  33   // unaffected.
  34   template <typename Interface>
  35   void AddService(const base::Callback<void(mojo::InterfaceRequest<Interface>)>
  36                       service_factory) {
  37     AddService(Interface::Name_,
  38                base::Bind(&ServiceRegistry::ForwardToServiceFactory<Interface>,
  39                           service_factory));
  40   }
  41   virtual void AddService(
  42       const std::string& service_name,
  43       const base::Callback<void(mojo::ScopedMessagePipeHandle)>
  44           service_factory) = 0;
  45
  46   // Remove future access to the service implementing Interface. Existing
  47   // connections to the service are unaffected.
  48   template <typename Interface>
  49   void RemoveService() {
  50     RemoveService(Interface::Name_);
  51   }
  52   virtual void RemoveService(const std::string& service_name) = 0;
  53
  54   // Connect to an interface provided by the remote service provider.
  55   template <typename Interface>
  56   void ConnectToRemoteService(mojo::InterfacePtr<Interface>* ptr) {
  57     mojo::MessagePipe pipe;
  58     ptr->Bind(pipe.handle0.Pass());
  59     ConnectToRemoteService(Interface::Name_, pipe.handle1.Pass());
  60   }
  61   virtual void ConnectToRemoteService(const base::StringPiece& name,
  62                                       mojo::ScopedMessagePipeHandle handle) = 0;
  63
  64  private:
  65   template <typename Interface>
  66   static void ForwardToServiceFactory(
  67       const base::Callback<void(mojo::InterfaceRequest<Interface>)>
  68           service_factory,
  69       mojo::ScopedMessagePipeHandle handle) {
  70     service_factory.Run(mojo::MakeRequest<Interface>(handle.Pass()));
  71   }
  72 };
  73
  74 }  // namespace content
  75
  76 #endif  // CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_