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//
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// detail/winrt_resolver_service.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP
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#define BOOST_ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#if defined(BOOST_ASIO_WINDOWS_RUNTIME)
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#include <boost/asio/ip/basic_resolver_iterator.hpp>
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#include <boost/asio/ip/basic_resolver_query.hpp>
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#include <boost/asio/detail/addressof.hpp>
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#include <boost/asio/detail/bind_handler.hpp>
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#include <boost/asio/detail/socket_ops.hpp>
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#include <boost/asio/detail/winrt_async_manager.hpp>
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#include <boost/asio/detail/winrt_resolve_op.hpp>
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#include <boost/asio/detail/winrt_utils.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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template <typename Protocol>
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class winrt_resolver_service
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{
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public:
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  // The implementation type of the resolver. A cancellation token is used to
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  // indicate to the asynchronous operation that the operation has been
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  // cancelled.
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  typedef socket_ops::shared_cancel_token_type implementation_type;
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  // The endpoint type.
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  typedef typename Protocol::endpoint endpoint_type;
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  // The query type.
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  typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
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  // The iterator type.
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  typedef boost::asio::ip::basic_resolver_iterator<Protocol> iterator_type;
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  // Constructor.
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  winrt_resolver_service(boost::asio::io_service& io_service)
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    : io_service_(use_service<io_service_impl>(io_service)),
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      async_manager_(use_service<winrt_async_manager>(io_service))
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  {
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  }
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  // Destructor.
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  ~winrt_resolver_service()
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  {
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  }
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  // Destroy all user-defined handler objects owned by the service.
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  void shutdown_service()
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  {
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  }
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  // Perform any fork-related housekeeping.
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  void fork_service(boost::asio::io_service::fork_event)
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  {
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  }
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  // Construct a new resolver implementation.
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  void construct(implementation_type&)
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  {
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  }
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  // Destroy a resolver implementation.
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  void destroy(implementation_type&)
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  {
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  }
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  // Cancel pending asynchronous operations.
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  void cancel(implementation_type&)
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  {
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  }
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  // Resolve a query to a list of entries.
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  iterator_type resolve(implementation_type&,
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      const query_type& query, boost::system::error_code& ec)
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  {
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    try
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    {
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      using namespace Windows::Networking::Sockets;
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      auto endpoint_pairs = async_manager_.sync(
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          DatagramSocket::GetEndpointPairsAsync(
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            winrt_utils::host_name(query.host_name()),
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            winrt_utils::string(query.service_name())), ec);
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      if (ec)
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        return iterator_type();
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      return iterator_type::create(
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          endpoint_pairs, query.hints(),
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          query.host_name(), query.service_name());
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    }
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    catch (Platform::Exception^ e)
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    {
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      ec = boost::system::error_code(e->HResult,
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          boost::system::system_category());
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      return iterator_type();
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    }
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  }
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  // Asynchronously resolve a query to a list of entries.
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  template <typename Handler>
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  void async_resolve(implementation_type&,
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      const query_type& query, Handler& handler)
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  {
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    bool is_continuation =
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      boost_asio_handler_cont_helpers::is_continuation(handler);
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    // Allocate and construct an operation to wrap the handler.
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    typedef winrt_resolve_op<Protocol, Handler> op;
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    typename op::ptr p = { boost::asio::detail::addressof(handler),
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      boost_asio_handler_alloc_helpers::allocate(
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        sizeof(op), handler), 0 };
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    p.p = new (p.v) op(query, handler);
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    BOOST_ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve"));
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    try
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    {
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      using namespace Windows::Networking::Sockets;
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      async_manager_.async(DatagramSocket::GetEndpointPairsAsync(
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            winrt_utils::host_name(query.host_name()),
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            winrt_utils::string(query.service_name())), p.p);
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      p.v = p.p = 0;
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    }
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    catch (Platform::Exception^ e)
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    {
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      p.p->ec_ = boost::system::error_code(
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          e->HResult, boost::system::system_category());
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      io_service_.post_immediate_completion(p.p, is_continuation);
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      p.v = p.p = 0;
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    }
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  }
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  // Resolve an endpoint to a list of entries.
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  iterator_type resolve(implementation_type&,
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      const endpoint_type&, boost::system::error_code& ec)
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  {
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    ec = boost::asio::error::operation_not_supported;
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    return iterator_type();
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  }
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  // Asynchronously resolve an endpoint to a list of entries.
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  template <typename Handler>
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  void async_resolve(implementation_type&,
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      const endpoint_type&, Handler& handler)
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  {
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    boost::system::error_code ec = boost::asio::error::operation_not_supported;
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    const iterator_type iterator;
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    io_service_.get_io_service().post(
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        detail::bind_handler(handler, ec, iterator));
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  }
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private:
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  io_service_impl& io_service_;
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  winrt_async_manager& async_manager_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
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#endif // BOOST_ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP