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86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
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/*
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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_LB_HPP_INCLUDED__
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#define __ZMQ_LB_HPP_INCLUDED__
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#include "array.hpp"
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namespace zmq
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{
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class msg_t;
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class pipe_t;
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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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ZMQ_NON_COPYABLE_NOR_MOVABLE (lb_t)
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};
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}
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#endif
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