1 files changed, 155 insertions, 0 deletions
diff --git a/src/data_distributor.cpp b/src/data_distributor.cpp
new file mode 100644
index 0000000..8f89c46
--- /dev/null
+++ b/src/data_distributor.cpp
@@ -0,0 +1,155 @@
+/*
+    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/>.
+*/
+
+#include "../include/zs.h"
+
+#include "data_distributor.hpp"
+#include "pipe_writer.hpp"
+#include "err.hpp"
+#include "session.hpp"
+#include "msg.hpp"
+
+zs::data_distributor_t::data_distributor_t () :
+    session (NULL)
+{
+}
+
+void zs::data_distributor_t::set_session (session_t *session_)
+{
+    zs_assert (!session);
+    session = session_;
+}
+
+void zs::data_distributor_t::shutdown ()
+{
+    //  No need to deallocate pipes here. They'll be deallocated during the
+    //  shutdown of the dispatcher.
+    delete this;
+}
+
+void zs::data_distributor_t::terminate ()
+{
+    //  Pipe unregisters itself during the call to terminate, so the pipes
+    //  list shinks by one in each iteration.
+    while (!pipes.empty ())
+        pipes [0]->terminate ();
+
+   delete this;
+}
+
+zs::data_distributor_t::~data_distributor_t ()
+{
+}
+
+void zs::data_distributor_t::attach_pipe (pipe_writer_t *pipe_)
+{
+    //  Associate demux with a new pipe.
+    pipe_->set_demux (this);
+    pipe_->set_index (pipes.size ());
+    pipes.push_back (pipe_);
+}
+
+void zs::data_distributor_t::detach_pipe (pipe_writer_t *pipe_)
+{
+    //  Release the reference to the pipe.
+    int index = pipe_->get_index ();
+    pipe_->set_index (-1);
+    pipes [index] = pipes.back ();
+    pipes [index]->set_index (index);
+    pipes.pop_back ();
+}
+
+bool zs::data_distributor_t::empty ()
+{
+    return pipes.empty ();
+}
+
+bool zs::data_distributor_t::send (zs_msg *msg_)
+{
+    int pipes_count = pipes.size ();
+
+    //  If there are no pipes available, simply drop the message.
+    if (pipes_count == 0) {
+        zs_msg_close (msg_);
+        zs_msg_init (msg_);
+        return true;
+    }
+
+    //  TODO: ???
+    //  First check whether all pipes are available for writing.
+//    for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it ++)
+//        if (!(*it)->check_write (msg_))
+//            return false;
+
+    //  For VSMs the copying is straighforward.
+    if (msg_->content == (zs_msg_content*) ZS_VSM) {
+        for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it ++)
+            write_to_pipe (*it, msg_);
+        zs_msg_init (msg_);
+        return true;
+    }
+
+    //  Optimisation for the case when there's only a single pipe
+    //  to send the message to - no refcount adjustment (i.e. atomic
+    //  operations) needed.
+    if (pipes_count == 1) {
+        write_to_pipe (*pipes.begin (), msg_);
+        zs_msg_init (msg_);
+        return true;
+    }
+
+    //  There are at least 2 destinations for the message. That means we have
+    //  to deal with reference counting. First add N-1 references to
+    //  the content (we are holding one reference anyway, that's why the -1).
+    if (msg_->shared)
+        msg_->content->refcnt.add (pipes_count - 1);
+    else {
+        msg_->shared = true;
+        // TODO: Add memory barrier here.
+        msg_->content->refcnt.set (pipes_count);
+    }
+
+    //  Push the message to all destinations.
+    for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it ++)
+        write_to_pipe (*it, msg_);
+
+    //  Detach the original message from the data buffer.
+    zs_msg_init (msg_);
+
+    return true;
+}
+
+void zs::data_distributor_t::flush ()
+{
+    //  Flush all pipes. If there's large number of pipes, it can be pretty
+    //  inefficient (especially if there's new message only in a single pipe).
+    //  Can it be improved?
+    for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it ++)
+        (*it)->flush ();
+}
+
+void zs::data_distributor_t::write_to_pipe (class pipe_writer_t *pipe_,
+    struct zs_msg *msg_)
+{
+    if (!pipe_->write (msg_)) {
+        //  TODO: Push gap notification to the pipe.
+        zs_assert (false);
+    }
+}
+