| // |
| // impl/buffered_write_stream.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef ASIO_IMPL_BUFFERED_WRITE_STREAM_HPP |
| #define ASIO_IMPL_BUFFERED_WRITE_STREAM_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/associated_allocator.hpp" |
| #include "asio/associated_executor.hpp" |
| #include "asio/detail/handler_alloc_helpers.hpp" |
| #include "asio/detail/handler_cont_helpers.hpp" |
| #include "asio/detail/handler_invoke_helpers.hpp" |
| #include "asio/detail/handler_type_requirements.hpp" |
| #include "asio/detail/non_const_lvalue.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| namespace asio { |
| |
| template <typename Stream> |
| std::size_t buffered_write_stream<Stream>::flush() |
| { |
| std::size_t bytes_written = write(next_layer_, |
| buffer(storage_.data(), storage_.size())); |
| storage_.consume(bytes_written); |
| return bytes_written; |
| } |
| |
| template <typename Stream> |
| std::size_t buffered_write_stream<Stream>::flush(asio::error_code& ec) |
| { |
| std::size_t bytes_written = write(next_layer_, |
| buffer(storage_.data(), storage_.size()), |
| transfer_all(), ec); |
| storage_.consume(bytes_written); |
| return bytes_written; |
| } |
| |
| namespace detail |
| { |
| template <typename WriteHandler> |
| class buffered_flush_handler |
| { |
| public: |
| buffered_flush_handler(detail::buffered_stream_storage& storage, |
| WriteHandler& handler) |
| : storage_(storage), |
| handler_(ASIO_MOVE_CAST(WriteHandler)(handler)) |
| { |
| } |
| |
| #if defined(ASIO_HAS_MOVE) |
| buffered_flush_handler(const buffered_flush_handler& other) |
| : storage_(other.storage_), |
| handler_(other.handler_) |
| { |
| } |
| |
| buffered_flush_handler(buffered_flush_handler&& other) |
| : storage_(other.storage_), |
| handler_(ASIO_MOVE_CAST(WriteHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(ASIO_HAS_MOVE) |
| |
| void operator()(const asio::error_code& ec, |
| const std::size_t bytes_written) |
| { |
| storage_.consume(bytes_written); |
| handler_(ec, bytes_written); |
| } |
| |
| //private: |
| detail::buffered_stream_storage& storage_; |
| WriteHandler handler_; |
| }; |
| |
| template <typename WriteHandler> |
| inline asio_handler_allocate_is_deprecated |
| asio_handler_allocate(std::size_t size, |
| buffered_flush_handler<WriteHandler>* this_handler) |
| { |
| #if defined(ASIO_NO_DEPRECATED) |
| asio_handler_alloc_helpers::allocate(size, this_handler->handler_); |
| return asio_handler_allocate_is_no_longer_used(); |
| #else // defined(ASIO_NO_DEPRECATED) |
| return asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename WriteHandler> |
| inline asio_handler_deallocate_is_deprecated |
| asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_flush_handler<WriteHandler>* this_handler) |
| { |
| asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_deallocate_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename WriteHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_flush_handler<WriteHandler>* this_handler) |
| { |
| return asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename WriteHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(Function& function, |
| buffered_flush_handler<WriteHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Function, typename WriteHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(const Function& function, |
| buffered_flush_handler<WriteHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Stream> |
| class initiate_async_buffered_flush |
| { |
| public: |
| typedef typename remove_reference< |
| Stream>::type::lowest_layer_type::executor_type executor_type; |
| |
| explicit initiate_async_buffered_flush( |
| typename remove_reference<Stream>::type& next_layer) |
| : next_layer_(next_layer) |
| { |
| } |
| |
| executor_type get_executor() const ASIO_NOEXCEPT |
| { |
| return next_layer_.lowest_layer().get_executor(); |
| } |
| |
| template <typename WriteHandler> |
| void operator()(ASIO_MOVE_ARG(WriteHandler) handler, |
| buffered_stream_storage* storage) const |
| { |
| // If you get an error on the following line it means that your handler |
| // does not meet the documented type requirements for a WriteHandler. |
| ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check; |
| |
| non_const_lvalue<WriteHandler> handler2(handler); |
| async_write(next_layer_, buffer(storage->data(), storage->size()), |
| buffered_flush_handler<typename decay<WriteHandler>::type>( |
| *storage, handler2.value)); |
| } |
| |
| private: |
| typename remove_reference<Stream>::type& next_layer_; |
| }; |
| } // namespace detail |
| |
| #if !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename WriteHandler, typename Allocator> |
| struct associated_allocator< |
| detail::buffered_flush_handler<WriteHandler>, Allocator> |
| { |
| typedef typename associated_allocator<WriteHandler, Allocator>::type type; |
| |
| static type get(const detail::buffered_flush_handler<WriteHandler>& h, |
| const Allocator& a = Allocator()) ASIO_NOEXCEPT |
| { |
| return associated_allocator<WriteHandler, Allocator>::get(h.handler_, a); |
| } |
| }; |
| |
| template <typename WriteHandler, typename Executor> |
| struct associated_executor< |
| detail::buffered_flush_handler<WriteHandler>, Executor> |
| : detail::associated_executor_forwarding_base<WriteHandler, Executor> |
| { |
| typedef typename associated_executor<WriteHandler, Executor>::type type; |
| |
| static type get(const detail::buffered_flush_handler<WriteHandler>& h, |
| const Executor& ex = Executor()) ASIO_NOEXCEPT |
| { |
| return associated_executor<WriteHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template < |
| ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, |
| std::size_t)) WriteHandler> |
| ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler, |
| void (asio::error_code, std::size_t)) |
| buffered_write_stream<Stream>::async_flush( |
| ASIO_MOVE_ARG(WriteHandler) handler) |
| { |
| return async_initiate<WriteHandler, |
| void (asio::error_code, std::size_t)>( |
| detail::initiate_async_buffered_flush<Stream>(next_layer_), |
| handler, &storage_); |
| } |
| |
| template <typename Stream> |
| template <typename ConstBufferSequence> |
| std::size_t buffered_write_stream<Stream>::write_some( |
| const ConstBufferSequence& buffers) |
| { |
| using asio::buffer_size; |
| if (buffer_size(buffers) == 0) |
| return 0; |
| |
| if (storage_.size() == storage_.capacity()) |
| this->flush(); |
| |
| return this->copy(buffers); |
| } |
| |
| template <typename Stream> |
| template <typename ConstBufferSequence> |
| std::size_t buffered_write_stream<Stream>::write_some( |
| const ConstBufferSequence& buffers, asio::error_code& ec) |
| { |
| ec = asio::error_code(); |
| |
| using asio::buffer_size; |
| if (buffer_size(buffers) == 0) |
| return 0; |
| |
| if (storage_.size() == storage_.capacity() && !flush(ec)) |
| return 0; |
| |
| return this->copy(buffers); |
| } |
| |
| namespace detail |
| { |
| template <typename ConstBufferSequence, typename WriteHandler> |
| class buffered_write_some_handler |
| { |
| public: |
| buffered_write_some_handler(detail::buffered_stream_storage& storage, |
| const ConstBufferSequence& buffers, WriteHandler& handler) |
| : storage_(storage), |
| buffers_(buffers), |
| handler_(ASIO_MOVE_CAST(WriteHandler)(handler)) |
| { |
| } |
| |
| #if defined(ASIO_HAS_MOVE) |
| buffered_write_some_handler(const buffered_write_some_handler& other) |
| : storage_(other.storage_), |
| buffers_(other.buffers_), |
| handler_(other.handler_) |
| { |
| } |
| |
| buffered_write_some_handler(buffered_write_some_handler&& other) |
| : storage_(other.storage_), |
| buffers_(other.buffers_), |
| handler_(ASIO_MOVE_CAST(WriteHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(ASIO_HAS_MOVE) |
| |
| void operator()(const asio::error_code& ec, std::size_t) |
| { |
| if (ec) |
| { |
| const std::size_t length = 0; |
| handler_(ec, length); |
| } |
| else |
| { |
| using asio::buffer_size; |
| std::size_t orig_size = storage_.size(); |
| std::size_t space_avail = storage_.capacity() - orig_size; |
| std::size_t bytes_avail = buffer_size(buffers_); |
| std::size_t length = bytes_avail < space_avail |
| ? bytes_avail : space_avail; |
| storage_.resize(orig_size + length); |
| const std::size_t bytes_copied = asio::buffer_copy( |
| storage_.data() + orig_size, buffers_, length); |
| handler_(ec, bytes_copied); |
| } |
| } |
| |
| //private: |
| detail::buffered_stream_storage& storage_; |
| ConstBufferSequence buffers_; |
| WriteHandler handler_; |
| }; |
| |
| template <typename ConstBufferSequence, typename WriteHandler> |
| inline asio_handler_allocate_is_deprecated |
| asio_handler_allocate(std::size_t size, |
| buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>* this_handler) |
| { |
| #if defined(ASIO_NO_DEPRECATED) |
| asio_handler_alloc_helpers::allocate(size, this_handler->handler_); |
| return asio_handler_allocate_is_no_longer_used(); |
| #else // defined(ASIO_NO_DEPRECATED) |
| return asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename ConstBufferSequence, typename WriteHandler> |
| inline asio_handler_deallocate_is_deprecated |
| asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>* this_handler) |
| { |
| asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_deallocate_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename ConstBufferSequence, typename WriteHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>* this_handler) |
| { |
| return asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename ConstBufferSequence, |
| typename WriteHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(Function& function, |
| buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Function, typename ConstBufferSequence, |
| typename WriteHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(const Function& function, |
| buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Stream> |
| class initiate_async_buffered_write_some |
| { |
| public: |
| typedef typename remove_reference< |
| Stream>::type::lowest_layer_type::executor_type executor_type; |
| |
| explicit initiate_async_buffered_write_some( |
| typename remove_reference<Stream>::type& next_layer) |
| : next_layer_(next_layer) |
| { |
| } |
| |
| executor_type get_executor() const ASIO_NOEXCEPT |
| { |
| return next_layer_.lowest_layer().get_executor(); |
| } |
| |
| template <typename WriteHandler, typename ConstBufferSequence> |
| void operator()(ASIO_MOVE_ARG(WriteHandler) handler, |
| buffered_stream_storage* storage, |
| const ConstBufferSequence& buffers) const |
| { |
| // If you get an error on the following line it means that your handler |
| // does not meet the documented type requirements for a WriteHandler. |
| ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check; |
| |
| using asio::buffer_size; |
| non_const_lvalue<WriteHandler> handler2(handler); |
| if (buffer_size(buffers) == 0 || storage->size() < storage->capacity()) |
| { |
| next_layer_.async_write_some(ASIO_CONST_BUFFER(0, 0), |
| buffered_write_some_handler<ConstBufferSequence, |
| typename decay<WriteHandler>::type>( |
| *storage, buffers, handler2.value)); |
| } |
| else |
| { |
| initiate_async_buffered_flush<Stream>(this->next_layer_)( |
| buffered_write_some_handler<ConstBufferSequence, |
| typename decay<WriteHandler>::type>( |
| *storage, buffers, handler2.value), |
| storage); |
| } |
| } |
| |
| private: |
| typename remove_reference<Stream>::type& next_layer_; |
| }; |
| } // namespace detail |
| |
| #if !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename ConstBufferSequence, |
| typename WriteHandler, typename Allocator> |
| struct associated_allocator< |
| detail::buffered_write_some_handler<ConstBufferSequence, WriteHandler>, |
| Allocator> |
| { |
| typedef typename associated_allocator<WriteHandler, Allocator>::type type; |
| |
| static type get( |
| const detail::buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>& h, |
| const Allocator& a = Allocator()) ASIO_NOEXCEPT |
| { |
| return associated_allocator<WriteHandler, Allocator>::get(h.handler_, a); |
| } |
| }; |
| |
| template <typename ConstBufferSequence, |
| typename WriteHandler, typename Executor> |
| struct associated_executor< |
| detail::buffered_write_some_handler<ConstBufferSequence, WriteHandler>, |
| Executor> |
| : detail::associated_executor_forwarding_base<WriteHandler, Executor> |
| { |
| typedef typename associated_executor<WriteHandler, Executor>::type type; |
| |
| static type get( |
| const detail::buffered_write_some_handler< |
| ConstBufferSequence, WriteHandler>& h, |
| const Executor& ex = Executor()) ASIO_NOEXCEPT |
| { |
| return associated_executor<WriteHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template <typename ConstBufferSequence, |
| ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, |
| std::size_t)) WriteHandler> |
| ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler, |
| void (asio::error_code, std::size_t)) |
| buffered_write_stream<Stream>::async_write_some( |
| const ConstBufferSequence& buffers, |
| ASIO_MOVE_ARG(WriteHandler) handler) |
| { |
| return async_initiate<WriteHandler, |
| void (asio::error_code, std::size_t)>( |
| detail::initiate_async_buffered_write_some<Stream>(next_layer_), |
| handler, &storage_, buffers); |
| } |
| |
| template <typename Stream> |
| template <typename ConstBufferSequence> |
| std::size_t buffered_write_stream<Stream>::copy( |
| const ConstBufferSequence& buffers) |
| { |
| using asio::buffer_size; |
| std::size_t orig_size = storage_.size(); |
| std::size_t space_avail = storage_.capacity() - orig_size; |
| std::size_t bytes_avail = buffer_size(buffers); |
| std::size_t length = bytes_avail < space_avail ? bytes_avail : space_avail; |
| storage_.resize(orig_size + length); |
| return asio::buffer_copy( |
| storage_.data() + orig_size, buffers, length); |
| } |
| |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_IMPL_BUFFERED_WRITE_STREAM_HPP |