From c98fd6bc3f2a49d7cb0b820a07354168c98f60b7 Mon Sep 17 00:00:00 2001
From: Martin Sustrik <sustrik@fastmq.commkdir>
Date: Tue, 24 Nov 2009 11:23:10 +0100
Subject: ZMQII-25: Implement streamed request/reply

---
 src/downstream.cpp | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/downstream.cpp

(limited to 'src/downstream.cpp')

diff --git a/src/downstream.cpp b/src/downstream.cpp
new file mode 100644
index 0000000..4f994e6
--- /dev/null
+++ b/src/downstream.cpp
@@ -0,0 +1,131 @@
+/*
+    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 "../bindings/c/zmq.h"
+
+#include "downstream.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::downstream_t::downstream_t (class app_thread_t *parent_) :
+    socket_base_t (parent_),
+    current (0)
+{
+    options.requires_in = false;
+    options.requires_out = true;
+}
+
+zmq::downstream_t::~downstream_t ()
+{
+}
+
+void zmq::downstream_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_)
+{
+    zmq_assert (!inpipe_ && outpipe_);
+    pipes.push_back (outpipe_);
+}
+
+void zmq::downstream_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+void zmq::downstream_t::xdetach_outpipe (class writer_t *pipe_)
+{
+    zmq_assert (pipe_);
+    pipes.erase (pipes.index (pipe_));
+}
+
+void zmq::downstream_t::xkill (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+void zmq::downstream_t::xrevive (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+int zmq::downstream_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    //  No special option for this socket type.
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::downstream_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    //  If there are no pipes we cannot send the message.
+    if (pipes.empty ()) {
+        errno = EAGAIN;
+        return -1;
+    }
+
+    //  Move to the next pipe (load-balancing).
+    current++;
+    if (current >= pipes.size ())
+        current = 0;
+
+    //  TODO: Implement this once queue limits are in-place.
+    zmq_assert (pipes [current]->check_write (zmq_msg_size (msg_)));
+
+    //  Push message to the selected pipe.
+    pipes [current]->write (msg_);
+    pipes [current]->flush ();
+
+    //  Detach the message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+
+    return 0;
+}
+
+int zmq::downstream_t::xflush ()
+{
+    //  TODO: Maybe there's a point in flushing messages downstream.
+    //  It may be useful in the case where number of messages in a single
+    //  transaction is much greater than the number of attached pipes.
+    errno = ENOTSUP;
+    return -1;
+
+}
+
+int zmq::downstream_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    errno = ENOTSUP;
+    return -1;
+}
+
+bool zmq::downstream_t::xhas_in ()
+{
+    return false;
+}
+
+bool zmq::downstream_t::xhas_out ()
+{
+    //  TODO: Modify this code once pipe limits are in place.
+    return true;
+}
+
+
-- 
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