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132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_ROUTER_HPP_INCLUDED__
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#define __ZMQ_ROUTER_HPP_INCLUDED__
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#include <map>
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#include "socket_base.hpp"
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#include "session_base.hpp"
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#include "stdint.hpp"
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#include "blob.hpp"
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#include "msg.hpp"
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#include "fq.hpp"
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namespace zmq
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{
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class ctx_t;
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class pipe_t;
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// TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
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class router_t : public routing_socket_base_t
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{
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public:
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router_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
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~router_t ();
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// Overrides of functions from socket_base_t.
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void xattach_pipe (zmq::pipe_t *pipe_,
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bool subscribe_to_all_,
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bool locally_initiated_);
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int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
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int xsend (zmq::msg_t *msg_);
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int xrecv (zmq::msg_t *msg_);
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bool xhas_in ();
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bool xhas_out ();
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void xread_activated (zmq::pipe_t *pipe_);
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void xpipe_terminated (zmq::pipe_t *pipe_);
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int get_peer_state (const void *routing_id_, size_t routing_id_size_) const;
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protected:
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// Rollback any message parts that were sent but not yet flushed.
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int rollback ();
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private:
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// Receive peer id and update lookup map
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bool identify_peer (pipe_t *pipe_, bool locally_initiated_);
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// Fair queueing object for inbound pipes.
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fq_t _fq;
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// True iff there is a message held in the pre-fetch buffer.
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bool _prefetched;
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// If true, the receiver got the message part with
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// the peer's identity.
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bool _routing_id_sent;
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// Holds the prefetched identity.
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msg_t _prefetched_id;
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// Holds the prefetched message.
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msg_t _prefetched_msg;
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// The pipe we are currently reading from
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zmq::pipe_t *_current_in;
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// Should current_in should be terminate after all parts received?
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bool _terminate_current_in;
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// If true, more incoming message parts are expected.
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bool _more_in;
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// We keep a set of pipes that have not been identified yet.
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std::set<pipe_t *> _anonymous_pipes;
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// The pipe we are currently writing to.
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zmq::pipe_t *_current_out;
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// If true, more outgoing message parts are expected.
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bool _more_out;
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// Routing IDs are generated. It's a simple increment and wrap-over
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// algorithm. This value is the next ID to use (if not used already).
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uint32_t _next_integral_routing_id;
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// If true, report EAGAIN to the caller instead of silently dropping
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// the message targeting an unknown peer.
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bool _mandatory;
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bool _raw_socket;
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// if true, send an empty message to every connected router peer
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bool _probe_router;
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// If true, the router will reassign an identity upon encountering a
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// name collision. The new pipe will take the identity, the old pipe
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// will be terminated.
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bool _handover;
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router_t (const router_t &);
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const router_t &operator= (const router_t &);
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};
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}
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#endif
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