buffered_write_stream.hpp
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//
// impl/buffered_write_stream.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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