'message distribution mechanism' separated from XPUB socket

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

src/dist.hpp

@@ -0,0 +1,76 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser 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
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_DIST_HPP_INCLUDED__
+#define __ZMQ_DIST_HPP_INCLUDED__
+
+#include "array.hpp"
+#include "pipe.hpp"
+
+namespace zmq
+{
+
+    //  Class manages a set of outbound pipes. It sends each messages to
+    //  each of them.
+    class dist_t : public i_writer_events
+    {
+    public:
+
+        dist_t (class own_t *sink_);
+        ~dist_t ();
+
+        void attach (writer_t *pipe_);
+        void terminate ();
+        int send (zmq_msg_t *msg_, int flags_);
+        bool has_out ();
+
+        //  i_writer_events interface implementation.
+        void activated (writer_t *pipe_);
+        void terminated (writer_t *pipe_);
+
+    private:
+
+        //  Write the message to the pipe. Make the pipe inactive if writing
+        //  fails. In such a case false is returned.
+        bool write (class writer_t *pipe_, zmq_msg_t *msg_);
+
+        //  List of outbound pipes.
+        typedef array_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;
+
+        //  True if last we are in the middle of a multipart message.
+        bool more;
+
+        //  Object to send events to.
+        class own_t *sink;
+
+        //  If true, termination process is already underway.
+        bool terminating;
+
+        dist_t (const dist_t&);
+        const dist_t &operator = (const dist_t&);
+    };
+
+}
+
+#endif