146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/*
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Copyright (c) 2007-2012, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_CONNECTION_QUEUE
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#define TORRENT_CONNECTION_QUEUE
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#include <list>
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#include <boost/function/function1.hpp>
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#include <boost/function/function0.hpp>
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#include <boost/noncopyable.hpp>
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#include "libtorrent/io_service.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/deadline_timer.hpp"
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#ifdef TORRENT_CONNECTION_LOGGING
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#include <fstream>
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#endif
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#include "libtorrent/thread.hpp"
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namespace libtorrent
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{
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class TORRENT_EXTRA_EXPORT connection_queue : public boost::noncopyable
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{
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public:
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connection_queue(io_service& ios);
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// if there are no free slots, returns the negative
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// number of queued up connections
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int free_slots() const;
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void enqueue(boost::function<void(int)> const& on_connect
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, boost::function<void()> const& on_timeout
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, time_duration timeout, int priority = 0);
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void done(int ticket);
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void limit(int limit);
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int limit() const;
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void close();
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int size() const { return m_queue.size(); }
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int num_connecting() const { return m_num_connecting; }
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#if defined TORRENT_ASIO_DEBUGGING
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float next_timeout() const { return total_milliseconds(m_timer.expires_at() - time_now_hires()) / 1000.f; }
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float max_timeout() const
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{
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ptime max_timeout = min_time();
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for (std::list<entry>::const_iterator i = m_queue.begin()
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, end(m_queue.end()); i != end; ++i)
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{
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if (!i->connecting) continue;
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if (i->expires > max_timeout) max_timeout = i->expires;
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}
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if (max_timeout == min_time()) return 0.f;
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return total_milliseconds(max_timeout - time_now_hires()) / 1000.f;
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}
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#endif
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#if defined TORRENT_DEBUG && !defined TORRENT_DISABLE_INVARIANT_CHECKS
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void check_invariant() const;
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#endif
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private:
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typedef mutex mutex_t;
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void try_connect(mutex_t::scoped_lock& l);
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void on_timeout(error_code const& e);
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void on_try_connect();
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struct entry
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{
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entry(): connecting(false), ticket(0), expires(max_time()), priority(0) {}
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// called when the connection is initiated
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// this is when the timeout countdown starts
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boost::function<void(int)> on_connect;
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// called if done hasn't been called within the timeout
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// or if the connection queue aborts. This means there
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// are 3 different interleaves of these function calls:
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// 1. on_connect
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// 2. on_connect, on_timeout
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// 3. on_timeout
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boost::function<void()> on_timeout;
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bool connecting;
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int ticket;
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ptime expires;
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time_duration timeout;
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int priority;
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};
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std::list<entry> m_queue;
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// the next ticket id a connection will be given
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int m_next_ticket;
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int m_num_connecting;
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int m_half_open_limit;
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bool m_abort;
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// the number of outstanding timers
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int m_num_timers;
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deadline_timer m_timer;
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mutable mutex_t m_mutex;
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#ifdef TORRENT_DEBUG
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bool m_in_timeout_function;
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#endif
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#ifdef TORRENT_CONNECTION_LOGGING
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std::ofstream m_log;
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#endif
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};
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}
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#endif
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