1 | // |
2 | // detail/service_registry.hpp |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
4 | // |
5 | // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
9 | // |
10 | |
11 | #ifndef BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP |
12 | #define BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP |
13 | |
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
15 | # pragma once |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
17 | |
18 | #include <boost/asio/detail/config.hpp> |
19 | #include <typeinfo> |
20 | #include <boost/asio/detail/mutex.hpp> |
21 | #include <boost/asio/detail/noncopyable.hpp> |
22 | #include <boost/asio/io_service.hpp> |
23 | |
24 | #include <boost/asio/detail/push_options.hpp> |
25 | |
26 | namespace boost { |
27 | namespace asio { |
28 | namespace detail { |
29 | |
30 | template <typename T> |
31 | class typeid_wrapper {}; |
32 | |
33 | class service_registry |
34 | : private noncopyable |
35 | { |
36 | public: |
37 | // Constructor. Adds the initial service. |
38 | template <typename Service, typename Arg> |
39 | service_registry(boost::asio::io_service& o, |
40 | Service* initial_service, Arg arg); |
41 | |
42 | // Destructor. |
43 | BOOST_ASIO_DECL ~service_registry(); |
44 | |
45 | // Notify all services of a fork event. |
46 | BOOST_ASIO_DECL void notify_fork(boost::asio::io_service::fork_event fork_ev); |
47 | |
48 | // Get the first service object cast to the specified type. Called during |
49 | // io_service construction and so performs no locking or type checking. |
50 | template <typename Service> |
51 | Service& first_service(); |
52 | |
53 | // Get the service object corresponding to the specified service type. Will |
54 | // create a new service object automatically if no such object already |
55 | // exists. Ownership of the service object is not transferred to the caller. |
56 | template <typename Service> |
57 | Service& use_service(); |
58 | |
59 | // Add a service object. Throws on error, in which case ownership of the |
60 | // object is retained by the caller. |
61 | template <typename Service> |
62 | void add_service(Service* new_service); |
63 | |
64 | // Check whether a service object of the specified type already exists. |
65 | template <typename Service> |
66 | bool has_service() const; |
67 | |
68 | private: |
69 | // Initialise a service's key based on its id. |
70 | BOOST_ASIO_DECL static void init_key( |
71 | boost::asio::io_service::service::key& key, |
72 | const boost::asio::io_service::id& id); |
73 | |
74 | #if !defined(BOOST_ASIO_NO_TYPEID) |
75 | // Initialise a service's key based on its id. |
76 | template <typename Service> |
77 | static void init_key(boost::asio::io_service::service::key& key, |
78 | const boost::asio::detail::service_id<Service>& /*id*/); |
79 | #endif // !defined(BOOST_ASIO_NO_TYPEID) |
80 | |
81 | // Check if a service matches the given id. |
82 | BOOST_ASIO_DECL static bool keys_match( |
83 | const boost::asio::io_service::service::key& key1, |
84 | const boost::asio::io_service::service::key& key2); |
85 | |
86 | // The type of a factory function used for creating a service instance. |
87 | typedef boost::asio::io_service::service* |
88 | (*factory_type)(boost::asio::io_service&); |
89 | |
90 | // Factory function for creating a service instance. |
91 | template <typename Service> |
92 | static boost::asio::io_service::service* create( |
93 | boost::asio::io_service& owner); |
94 | |
95 | // Destroy a service instance. |
96 | BOOST_ASIO_DECL static void destroy( |
97 | boost::asio::io_service::service* service); |
98 | |
99 | // Helper class to manage service pointers. |
100 | struct auto_service_ptr; |
101 | friend struct auto_service_ptr; |
102 | struct auto_service_ptr |
103 | { |
104 | boost::asio::io_service::service* ptr_; |
105 | ~auto_service_ptr() { destroy(service: ptr_); } |
106 | }; |
107 | |
108 | // Get the service object corresponding to the specified service key. Will |
109 | // create a new service object automatically if no such object already |
110 | // exists. Ownership of the service object is not transferred to the caller. |
111 | BOOST_ASIO_DECL boost::asio::io_service::service* do_use_service( |
112 | const boost::asio::io_service::service::key& key, |
113 | factory_type factory); |
114 | |
115 | // Add a service object. Throws on error, in which case ownership of the |
116 | // object is retained by the caller. |
117 | BOOST_ASIO_DECL void do_add_service( |
118 | const boost::asio::io_service::service::key& key, |
119 | boost::asio::io_service::service* new_service); |
120 | |
121 | // Check whether a service object with the specified key already exists. |
122 | BOOST_ASIO_DECL bool do_has_service( |
123 | const boost::asio::io_service::service::key& key) const; |
124 | |
125 | // Mutex to protect access to internal data. |
126 | mutable boost::asio::detail::mutex mutex_; |
127 | |
128 | // The owner of this service registry and the services it contains. |
129 | boost::asio::io_service& owner_; |
130 | |
131 | // The first service in the list of contained services. |
132 | boost::asio::io_service::service* first_service_; |
133 | }; |
134 | |
135 | } // namespace detail |
136 | } // namespace asio |
137 | } // namespace boost |
138 | |
139 | #include <boost/asio/detail/pop_options.hpp> |
140 | |
141 | #include <boost/asio/detail/impl/service_registry.hpp> |
142 | #if defined(BOOST_ASIO_HEADER_ONLY) |
143 | # include <boost/asio/detail/impl/service_registry.ipp> |
144 | #endif // defined(BOOST_ASIO_HEADER_ONLY) |
145 | |
146 | #endif // BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP |
147 | |