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79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
/*
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Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ 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 as published by
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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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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public 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_LB_HPP_INCLUDED__
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#define __ZMQ_LB_HPP_INCLUDED__
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#include "array.hpp"
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#include "pipe.hpp"
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namespace zmq
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{
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// This class manages a set of outbound pipes. On send it load balances
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// messages fairly among the pipes.
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class lb_t
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{
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public:
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lb_t ();
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~lb_t ();
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void attach (pipe_t *pipe_);
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void activated (pipe_t *pipe_);
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void pipe_terminated (pipe_t *pipe_);
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int send (msg_t *msg_);
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// Sends a message and stores the pipe that was used in pipe_.
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// It is possible for this function to return success but keep pipe_
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// unset if the rest of a multipart message to a terminated pipe is
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// being dropped. For the first frame, this will never happen.
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int sendpipe (msg_t *msg_, pipe_t **pipe_);
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bool has_out ();
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private:
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// List of outbound pipes.
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typedef array_t <pipe_t, 2> pipes_t;
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pipes_t pipes;
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// Number of active pipes. All the active pipes are located at the
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// beginning of the pipes array.
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pipes_t::size_type active;
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// Points to the last pipe that the most recent message was sent to.
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pipes_t::size_type current;
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// True if last we are in the middle of a multipart message.
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bool more;
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// True if we are dropping current message.
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bool dropping;
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lb_t (const lb_t&);
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const lb_t &operator = (const lb_t&);
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};
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}
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#endif
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