| src/examples/cpp03/allocation/server.cpp | src/examples/cpp11/allocation/server.cpp |
|---|
| ⋮ | ⋮ |
| 1 | // | 1 | // |
| 2 | //·server.cpp | 2 | //·server.cpp |
| 3 | //·~~~~~~~~~~ | 3 | //·~~~~~~~~~~ |
| 4 | // | 4 | // |
| 5 | //·Copyright·(c)·2003-2020·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) | 5 | //·Copyright·(c)·2003-2020·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) |
| 6 | // | 6 | // |
| 7 | //·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying | 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) | 8 | //·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt) |
| 9 | // | 9 | // |
| 10 | | 10 | |
| | 11 | #include·<array> |
| 11 | #include·<cstdlib> | 12 | #include·<cstdlib> |
| 12 | #include·<iostream> | 13 | #include·<iostream> |
| 13 | #include·<boost/aligned_storage.hpp> | 14 | #include·<memory> |
| 14 | #include·<boost/array.hpp> | 15 | #include·<type_traits> |
| 15 | #include·<boost/bind/bind.hpp> | 16 | #include·<utility> |
| 16 | #include·<boost/enable_shared_from_this.hpp> | |
| 17 | #include·<boost/noncopyable.hpp> | |
| 18 | #include·<boost/shared_ptr.hpp> | |
| 19 | #include·"asio.hpp" | 17 | #include·"asio.hpp" |
| 20 | | 18 | |
| 21 | using·asio::ip::tcp; | 19 | using·asio::ip::tcp; |
| 22 | | 20 | |
| 23 | //·Class·to·manage·the·memory·to·be·used·for·handler-based·custom·allocation. | 21 | //·Class·to·manage·the·memory·to·be·used·for·handler-based·custom·allocation. |
| 24 | //·It·contains·a·single·block·of·memory·which·may·be·returned·for·allocation | 22 | //·It·contains·a·single·block·of·memory·which·may·be·returned·for·allocation |
| 25 | //·requests.·If·the·memory·is·in·use·when·an·allocation·request·is·made,·the | 23 | //·requests.·If·the·memory·is·in·use·when·an·allocation·request·is·made,·the |
| 26 | //·allocator·delegates·allocation·to·the·global·heap. | 24 | //·allocator·delegates·allocation·to·the·global·heap. |
| 27 | class·handler_memory | 25 | class·handler_memory |
| 28 | ··:·private·boost::noncopyable | |
| 29 | { | 26 | { |
| 30 | public: | 27 | public: |
| 31 | ··handler_memory() | 28 | ··handler_memory() |
| 32 | ····:·in_use_(false) | 29 | ····:·in_use_(false) |
| 33 | ··{ | 30 | ··{ |
| 34 | ··} | 31 | ··} |
| 35 | | 32 | |
| | 33 | ··handler_memory(const·handler_memory&)·=·delete; |
| | 34 | ··handler_memory&·operator=(const·handler_memory&)·=·delete; |
| | 35 | |
| 36 | ··void*·allocate(std::size_t·size) | 36 | ··void*·allocate(std::size_t·size) |
| 37 | ··{ | 37 | ··{ |
| 38 | ····if·(!in_use_·&&·size·<·storage_.size) | 38 | ····if·(!in_use_·&&·size·<·sizeof(storage_)) |
| 39 | ····{ | 39 | ····{ |
| 40 | ······in_use_·=·true; | 40 | ······in_use_·=·true; |
| 41 | ······return·storage_.address(); | 41 | ······return·&storage_; |
| 42 | ····} | 42 | ····} |
| 43 | ····else | 43 | ····else |
| 44 | ····{ | 44 | ····{ |
| 45 | ······return·::operator·new(size); | 45 | ······return·::operator·new(size); |
| 46 | ····} | 46 | ····} |
| 47 | ··} | 47 | ··} |
| 48 | | 48 | |
| 49 | ··void·deallocate(void*·pointer) | 49 | ··void·deallocate(void*·pointer) |
| 50 | ··{ | 50 | ··{ |
| 51 | ····if·(pointer·==·storage_.address()) | 51 | ····if·(pointer·==·&storage_) |
| 52 | ····{ | 52 | ····{ |
| 53 | ······in_use_·=·false; | 53 | ······in_use_·=·false; |
| 54 | ····} | 54 | ····} |
| 55 | ····else | 55 | ····else |
| 56 | ····{ | 56 | ····{ |
| 57 | ······::operator·delete(pointer); | 57 | ······::operator·delete(pointer); |
| 58 | ····} | 58 | ····} |
| 59 | ··} | 59 | ··} |
| 60 | | 60 | |
| 61 | private: | 61 | private: |
| 62 | ··//·Storage·space·used·for·handler-based·custom·memory·allocation. | 62 | ··//·Storage·space·used·for·handler-based·custom·memory·allocation. |
| 63 | ··boost::aligned_storage<1024>·storage_; | 63 | ··typename·std::aligned_storage<1024>::type·storage_; |
| 64 | | 64 | |
| 65 | ··//·Whether·the·handler-based·custom·allocation·storage·has·been·used. | 65 | ··//·Whether·the·handler-based·custom·allocation·storage·has·been·used. |
| 66 | ··bool·in_use_; | 66 | ··bool·in_use_; |
| 67 | }; | 67 | }; |
| 68 | | 68 | |
| 69 | //·The·allocator·to·be·associated·with·the·handler·objects.·This·allocator·only | 69 | //·The·allocator·to·be·associated·with·the·handler·objects.·This·allocator·only |
| 70 | //·needs·to·satisfy·the·C++11·minimal·allocator·requirements,·plus·rebind·when | 70 | //·needs·to·satisfy·the·C++11·minimal·allocator·requirements. |
| 71 | //·targeting·C++03. | |
| 72 | template·<typename·T> | 71 | template·<typename·T> |
| 73 | class·handler_allocator | 72 | class·handler_allocator |
| 74 | { | 73 | { |
| 75 | public: | 74 | public: |
| 76 | ··typedef·T·value_type; | 75 | ··using·value_type·=·T; |
| 77 | | 76 | |
| 78 | ··explicit·handler_allocator(handler_memory&·mem) | 77 | ··explicit·handler_allocator(handler_memory&·mem) |
| 79 | ····:·memory_(mem) | 78 | ····:·memory_(mem) |
| 80 | ··{ | 79 | ··{ |
| 81 | ··} | 80 | ··} |
| 82 | | 81 | |
| 83 | ··template·<typename·U> | 82 | ··template·<typename·U> |
| 84 | ··handler_allocator(const·handler_allocator<U>&·other) | 83 | ··handler_allocator(const·handler_allocator<U>&·other)·noexcept |
| 85 | ····:·memory_(other.memory_) | 84 | ····:·memory_(other.memory_) |
| 86 | ··{ | 85 | ··{ |
| 87 | ··} | 86 | ··} |
| 88 | | 87 | |
| 89 | ··template·<typename·U> | 88 | ··bool·operator==(const·handler_allocator&·other)·const·noexcept |
| 90 | ··struct·rebind | |
| 91 | ··{ | |
| 92 | ····typedef·handler_allocator<U>·other; | |
| 93 | ··}; | |
| 94 | | |
| 95 | ··bool·operator==(const·handler_allocator&·other)·const | |
| 96 | ··{ | 89 | ··{ |
| 97 | ····return·&memory_·==·&other.memory_; | 90 | ····return·&memory_·==·&other.memory_; |
| 98 | ··} | 91 | ··} |
| 99 | | 92 | |
| 100 | ··bool·operator!=(const·handler_allocator&·other)·const | 93 | ··bool·operator!=(const·handler_allocator&·other)·const·noexcept |
| 101 | ··{ | 94 | ··{ |
| 102 | ····return·&memory_·!=·&other.memory_; | 95 | ····return·&memory_·!=·&other.memory_; |
| 103 | ··} | 96 | ··} |
| 104 | | 97 | |
| 105 | ··T*·allocate(std::size_t·n)·const | 98 | ··T*·allocate(std::size_t·n)·const |
| 106 | ··{ | 99 | ··{ |
| 107 | ····return·static_cast<T*>(memory_.allocate(sizeof(T)·*·n)); | 100 | ····return·static_cast<T*>(memory_.allocate(sizeof(T)·*·n)); |
| 108 | ··} | 101 | ··} |
| 109 | | 102 | |
| 110 | ··void·deallocate(T*·p,·std::size_t·/*n*/)·const | 103 | ··void·deallocate(T*·p,·std::size_t·/*n*/)·const |
| 111 | ··{ | 104 | ··{ |
| 112 | ····return·memory_.deallocate(p); | 105 | ····return·memory_.deallocate(p); |
| 113 | ··} | 106 | ··} |
| 114 | | 107 | |
| 115 | //private: | 108 | private: |
| | 109 | ··template·<typename>·friend·class·handler_allocator; |
| | 110 | |
| 116 | ··//·The·underlying·memory. | 111 | ··//·The·underlying·memory. |
| 117 | ··handler_memory&·memory_; | 112 | ··handler_memory&·memory_; |
| 118 | }; | 113 | }; |
| 119 | | 114 | |
| 120 | //·Wrapper·class·template·for·handler·objects·to·allow·handler·memory | 115 | //·Wrapper·class·template·for·handler·objects·to·allow·handler·memory |
| 121 | //·allocation·to·be·customised.·The·allocator_type·typedef·and·get_allocator() | 116 | //·allocation·to·be·customised.·The·allocator_type·type·and·get_allocator() |
| 122 | //·member·function·are·used·by·the·asynchronous·operations·to·obtain·the | 117 | //·member·function·are·used·by·the·asynchronous·operations·to·obtain·the |
| 123 | //·allocator.·Calls·to·operator()·are·forwarded·to·the·encapsulated·handler. | 118 | //·allocator.·Calls·to·operator()·are·forwarded·to·the·encapsulated·handler. |
| 124 | template·<typename·Handler> | 119 | template·<typename·Handler> |
| 125 | class·custom_alloc_handler | 120 | class·custom_alloc_handler |
| 126 | { | 121 | { |
| 127 | public: | 122 | public: |
| 128 | ··typedef·handler_allocator<Handler>·allocator_type; | 123 | ··using·allocator_type·=·handler_allocator<Handler>; |
| 129 | | 124 | |
| 130 | ··custom_alloc_handler(handler_memory&·m,·Handler·h) | 125 | ··custom_alloc_handler(handler_memory&·m,·Handler·h) |
| 131 | ····:·memory_(m), | 126 | ····:·memory_(m), |
| 132 | ······handler_(h) | 127 | ······handler_(h) |
| 133 | ··{ | 128 | ··{ |
| 134 | ··} | 129 | ··} |
| 135 | | 130 | |
| 136 | ··allocator_type·get_allocator()·const | 131 | ··allocator_type·get_allocator()·const·noexcept |
| 137 | ··{ | 132 | ··{ |
| 138 | ····return·allocator_type(memory_); | 133 | ····return·allocator_type(memory_); |
| 139 | ··} | 134 | ··} |
| 140 | | 135 | |
| 141 | ··template·<typename·Arg1> | 136 | ··template·<typename·...Args> |
| 142 | ··void·operator()(Arg1·arg1) | 137 | ··void·operator()(Args&&...·args) |
| 143 | ··{ | |
| 144 | ····handler_(arg1); | |
| 145 | ··} | |
| 146 | | |
| 147 | ··template·<typename·Arg1,·typename·Arg2> | |
| 148 | ··void·operator()(Arg1·arg1,·Arg2·arg2) | |
| 149 | ··{ | 138 | ··{ |
| 150 | ····handler_(arg1,·arg2); | 139 | ····handler_(std::forward<Args>(args)...); |
| 151 | ··} | 140 | ··} |
| 152 | | 141 | |
| 153 | private: | 142 | private: |
| 154 | ··handler_memory&·memory_; | 143 | ··handler_memory&·memory_; |
| 155 | ··Handler·handler_; | 144 | ··Handler·handler_; |
| 156 | }; | 145 | }; |
| 157 | | 146 | |
| 158 | //·Helper·function·to·wrap·a·handler·object·to·add·custom·allocation. | 147 | //·Helper·function·to·wrap·a·handler·object·to·add·custom·allocation. |
| 159 | template·<typename·Handler> | 148 | template·<typename·Handler> |
| 160 | inline·custom_alloc_handler<Handler>·make_custom_alloc_handler( | 149 | inline·custom_alloc_handler<Handler>·make_custom_alloc_handler( |
| 161 | ····handler_memory&·m,·Handler·h) | 150 | ····handler_memory&·m,·Handler·h) |
| 162 | { | 151 | { |
| 163 | ··return·custom_alloc_handler<Handler>(m,·h); | 152 | ··return·custom_alloc_handler<Handler>(m,·h); |
| 164 | } | 153 | } |
| 165 | | 154 | |
| 166 | class·session | 155 | class·session |
| 167 | ··:·public·boost::enable_shared_from_this<session> | 156 | ··:·public·std::enable_shared_from_this<session> |
| 168 | { | 157 | { |
| 169 | public: | 158 | public: |
| 170 | ··session(asio::io_context&·io_context) | 159 | ··session(tcp::socket·socket) |
| 171 | ····:·socket_(io_context) | 160 | ····:·socket_(std::move(socket)) |
| 172 | ··{ | 161 | ··{ |
| 173 | ··} | 162 | ··} |
| 174 | | 163 | |
| 175 | ··tcp::socket&·socket() | 164 | ··void·start() |
| 176 | ··{ | 165 | ··{ |
| 177 | ····return·socket_; | 166 | ····do_read(); |
| 178 | ··} | 167 | ··} |
| 179 | | 168 | |
| 180 | ··void·start() | 169 | private: |
| | 170 | ··void·do_read() |
| 181 | ··{ | 171 | ··{ |
| | 172 | ····auto·self(shared_from_this()); |
| 182 | ····socket_.async_read_some(asio::buffer(data_), | 173 | ····socket_.async_read_some(asio::buffer(data_), |
| 183 | ········make_custom_alloc_handler(handler_memory_, | 174 | ········make_custom_alloc_handler(handler_memory_, |
| 184 | ··········boost::bind(&session::handle_read, | 175 | ··········[this,·self](std::error_code·ec,·std::size_t·length) |
| 185 | ············shared_from_this(), | 176 | ··········{ |
| 186 | ············asio::placeholders::error, | 177 | ············if·(!ec) |
| 187 | ············asio::placeholders::bytes_transferred))); | 178 | ············{ |
| 188 | ··} | 179 | ··············do_write(length); |
| 189 | | 180 | ············} |
| 190 | ··void·handle_read(const·asio::error_code&·error, | 181 | ··········})); |
| 191 | ······size_t·bytes_transferred) | |
| 192 | ··{ | |
| 193 | ····if·(!error) | |
| 194 | ····{ | |
| 195 | ······asio::async_write(socket_, | |
| 196 | ··········asio::buffer(data_,·bytes_transferred), | |
| 197 | ··········make_custom_alloc_handler(handler_memory_, | |
| 198 | ············boost::bind(&session::handle_write, | |
| 199 | ··············shared_from_this(), | |
| 200 | ··············asio::placeholders::error))); | |
| 201 | ····} | |
| 202 | ··} | 182 | ··} |
| 203 | | 183 | |
| 204 | ··void·handle_write(const·asio::error_code&·error) | 184 | ··void·do_write(std::size_t·length) |
| 205 | ··{ | 185 | ··{ |
| 206 | ····if·(!error) | 186 | ····auto·self(shared_from_this()); |
| 207 | ····{ | 187 | ····asio::async_write(socket_,·asio::buffer(data_,·length), |
| 208 | ······socket_.async_read_some(asio::buffer(data_), | 188 | ········make_custom_alloc_handler(handler_memory_, |
| 209 | ··········make_custom_alloc_handler(handler_memory_, | 189 | ··········[this,·self](std::error_code·ec,·std::size_t·/*length*/) |
| 210 | ············boost::bind(&session::handle_read, | 190 | ··········{ |
| 211 | ··············shared_from_this(), | 191 | ············if·(!ec) |
| 212 | ··············asio::placeholders::error, | 192 | ············{ |
| 213 | ··············asio::placeholders::bytes_transferred))); | 193 | ··············do_read(); |
| 214 | ····} | 194 | ············} |
| | 195 | ··········})); |
| 215 | ··} | 196 | ··} |
| 216 | | 197 | |
| 217 | private: | |
| 218 | ··//·The·socket·used·to·communicate·with·the·client. | 198 | ··//·The·socket·used·to·communicate·with·the·client. |
| 219 | ··tcp::socket·socket_; | 199 | ··tcp::socket·socket_; |
| 220 | | 200 | |
| 221 | ··//·Buffer·used·to·store·data·received·from·the·client. | 201 | ··//·Buffer·used·to·store·data·received·from·the·client. |
| 222 | ··boost::array<char,·1024>·data_; | 202 | ··std::array<char,·1024>·data_; |
| 223 | | 203 | |
| 224 | ··//·The·memory·to·use·for·handler-based·custom·memory·allocation. | 204 | ··//·The·memory·to·use·for·handler-based·custom·memory·allocation. |
| 225 | ··handler_memory·handler_memory_; | 205 | ··handler_memory·handler_memory_; |
| 226 | }; | 206 | }; |
| 227 | | 207 | |
| 228 | typedef·boost::shared_ptr<session>·session_ptr; | |
| 229 | | |
| 230 | class·server | 208 | class·server |
| 231 | { | 209 | { |
| 232 | public: | 210 | public: |
| 233 | ··server(asio::io_context&·io_context,·short·port) | 211 | ··server(asio::io_context&·io_context,·short·port) |
| 234 | ····:·io_context_(io_context), | 212 | ····:·acceptor_(io_context,·tcp::endpoint(tcp::v4(),·port)) |
| 235 | ······acceptor_(io_context,·tcp::endpoint(tcp::v4(),·port)) | |
| 236 | ··{ | 213 | ··{ |
| 237 | ····session_ptr·new_session(new·session(io_context_)); | 214 | ····do_accept(); |
| 238 | ····acceptor_.async_accept(new_session->socket(), | |
| 239 | ········boost::bind(&server::handle_accept,·this,·new_session, | |
| 240 | ··········asio::placeholders::error)); | |
| 241 | ··} | 215 | ··} |
| 242 | | 216 | |
| 243 | ··void·handle_accept(session_ptr·new_session, | 217 | private: |
| 244 | ······const·asio::error_code&·error) | 218 | ··void·do_accept() |
| 245 | ··{ | 219 | ··{ |
| 246 | ····if·(!error) | 220 | ····acceptor_.async_accept( |
| 247 | ····{ | 221 | ········[this](std::error_code·ec,·tcp::socket·socket) |
| 248 | ······new_session->start(); | 222 | ········{ |
| 249 | ····} | 223 | ··········if·(!ec) |
| | 224 | ··········{ |
| | 225 | ············std::make_shared<session>(std::move(socket))->start(); |
| | 226 | ··········} |
| 250 | | 227 | |
| 251 | ····new_session.reset(new·session(io_context_)); | 228 | ··········do_accept(); |
| 252 | ····acceptor_.async_accept(new_session->socket(), | 229 | ········}); |
| 253 | ········boost::bind(&server::handle_accept,·this,·new_session, | |
| 254 | ··········asio::placeholders::error)); | |
| 255 | ··} | 230 | ··} |
| 256 | | 231 | |
| 257 | private: | |
| 258 | ··asio::io_context&·io_context_; | |
| 259 | ··tcp::acceptor·acceptor_; | 232 | ··tcp::acceptor·acceptor_; |
| 260 | }; | 233 | }; |
| 261 | | 234 | |
| 262 | int·main(int·argc,·char*·argv[]) | 235 | int·main(int·argc,·char*·argv[]) |
| 263 | { | 236 | { |
| 264 | ··try | 237 | ··try |
| 265 | ··{ | 238 | ··{ |
| 266 | ····if·(argc·!=·2) | 239 | ····if·(argc·!=·2) |
| 267 | ····{ | 240 | ····{ |
| 268 | ······std::cerr·<<·"Usage:·server·<port>\n"; | 241 | ······std::cerr·<<·"Usage:·server·<port>\n"; |
| 269 | ······return·1; | 242 | ······return·1; |
| 270 | ····} | 243 | ····} |
| 271 | | 244 | |
| 272 | ····asio::io_context·io_context; | 245 | ····asio::io_context·io_context; |
| 273 | | 246 | ····server·s(io_context,·std::atoi(argv[1])); |
| 274 | ····using·namespace·std;·//·For·atoi. | |
| 275 | ····server·s(io_context,·atoi(argv[1])); | |
| 276 | | |
| 277 | ····io_context.run(); | 247 | ····io_context.run(); |
| 278 | ··} | 248 | ··} |
| 279 | ··catch·(std::exception&·e) | 249 | ··catch·(std::exception&·e) |
| 280 | ··{ | 250 | ··{ |
| 281 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; | 251 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; |
| 282 | ··} | 252 | ··} |
| 283 | | 253 | |
| 284 | ··return·0; | 254 | ··return·0; |
| 285 | } | 255 | } |