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authorMartin Sustrik <sustrik@fastmq.commkdir>2009-12-15 09:09:19 +0100
committerMartin Sustrik <sustrik@fastmq.commkdir>2009-12-15 09:09:19 +0100
commite49115224a7957b0e5d49326bc02ae6af186eaf9 (patch)
tree81d1ca0ea496004bbc85cec9b3289af96cdaa197 /src/lb.hpp
parentbd792faa9d6c78c375dbc52c6d773e157335da36 (diff)
zmq_encoder/decoder are able to add/trim prefixes from messages; fair queueing and load balancing algorithms factorised into separate classes
Diffstat (limited to 'src/lb.hpp')
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+/*
+ Copyright (c) 2007-2009 FastMQ Inc.
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the Lesser GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ 0MQ is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ Lesser GNU General Public License for more details.
+
+ You should have received a copy of the Lesser GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_LB_HPP_INCLUDED__
+#define __ZMQ_LB_HPP_INCLUDED__
+
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+ // Class manages a set of outbound pipes. On send it load balances
+ // messages fairly among the pipes.
+ class lb_t
+ {
+ public:
+
+ lb_t ();
+ ~lb_t ();
+
+ void attach (class writer_t *pipe_);
+ void detach (class writer_t *pipe_);
+ void kill (class writer_t *pipe_);
+ void revive (class writer_t *pipe_);
+ int send (zmq_msg_t *msg_, int flags_);
+ bool has_out ();
+
+ private:
+
+ // List of outbound pipes.
+ typedef yarray_t <class writer_t> pipes_t;
+ pipes_t pipes;
+
+ // Number of active pipes. All the active pipes are located at the
+ // beginning of the pipes array.
+ pipes_t::size_type active;
+
+ // Points to the last pipe that the most recent message was sent to.
+ pipes_t::size_type current;
+
+ lb_t (const lb_t&);
+ void operator = (const lb_t&);
+ };
+
+}
+
+#endif