service_registry.h revision 116680a4aac90f2aa7413d9095a592090648e557 
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 "mojo/public/cpp/bindings/interface_ptr.h"
15#include "mojo/public/cpp/bindings/interface_request.h"
16#include "mojo/public/cpp/system/core.h"
17
18namespace 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.
24class 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.
32  template <typename Interface>
33  void AddService(const base::Callback<void(mojo::InterfaceRequest<Interface>)>
34                      service_factory) {
35    AddService(Interface::Name_,
36               base::Bind(&ServiceRegistry::ForwardToServiceFactory<Interface>,
37                          service_factory));
38  }
39  virtual void AddService(
40      const std::string& service_name,
41      const base::Callback<void(mojo::ScopedMessagePipeHandle)>
42          service_factory) = 0;
43
44  // Remove future access to the service implementing Interface. Existing
45  // connections to the service are unaffected.
46  template <typename Interface>
47  void RemoveService() {
48    RemoveService(Interface::Name_);
49  }
50  virtual void RemoveService(const std::string& service_name) = 0;
51
52  // Connect to an interface provided by the remote service provider.
53  template <typename Interface>
54  void ConnectToRemoteService(mojo::InterfacePtr<Interface>* ptr) {
55    mojo::MessagePipe pipe;
56    ptr->Bind(pipe.handle0.Pass());
57    ConnectToRemoteService(Interface::Name_, pipe.handle1.Pass());
58  }
59  virtual void ConnectToRemoteService(const base::StringPiece& name,
60                                      mojo::ScopedMessagePipeHandle handle) = 0;
61
62 private:
63  template <typename Interface>
64  static void ForwardToServiceFactory(
65      const base::Callback<void(mojo::InterfaceRequest<Interface>)>
66          service_factory,
67      mojo::ScopedMessagePipeHandle handle) {
68    service_factory.Run(mojo::MakeRequest<Interface>(handle.Pass()));
69  }
70};
71
72}  // namespace content
73
74#endif  // CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_
75