summaryrefslogtreecommitdiff
path: root/src/upstream.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/upstream.cpp')
-rw-r--r--src/upstream.cpp143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/upstream.cpp b/src/upstream.cpp
new file mode 100644
index 0000000..da202f8
--- /dev/null
+++ b/src/upstream.cpp
@@ -0,0 +1,143 @@
+/*
+ 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 "upstream.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::upstream_t::upstream_t (class app_thread_t *parent_) :
+ socket_base_t (parent_),
+ active (0),
+ current (0)
+{
+ options.requires_in = true;
+ options.requires_out = false;
+}
+
+zmq::upstream_t::~upstream_t ()
+{
+}
+
+void zmq::upstream_t::xattach_pipes (class reader_t *inpipe_,
+ class writer_t *outpipe_)
+{
+ zmq_assert (inpipe_ && !outpipe_);
+
+ pipes.push_back (inpipe_);
+ pipes.swap (active, pipes.size () - 1);
+ active++;
+}
+
+void zmq::upstream_t::xdetach_inpipe (class reader_t *pipe_)
+{
+ // Remove the pipe from the list; adjust number of active pipes
+ // accordingly.
+ zmq_assert (pipe_);
+ pipes_t::size_type index = pipes.index (pipe_);
+ if (index < active)
+ active--;
+ pipes.erase (index);
+}
+
+void zmq::upstream_t::xdetach_outpipe (class writer_t *pipe_)
+{
+ // There are no outpipes, so this function shouldn't be called at all.
+ zmq_assert (false);
+}
+
+void zmq::upstream_t::xkill (class reader_t *pipe_)
+{
+ // Move the pipe to the list of inactive pipes.
+ active--;
+ pipes.swap (pipes.index (pipe_), active);
+}
+
+void zmq::upstream_t::xrevive (class reader_t *pipe_)
+{
+ // Move the pipe to the list of active pipes.
+ pipes.swap (pipes.index (pipe_), active);
+ active++;
+}
+
+int zmq::upstream_t::xsetsockopt (int option_, const void *optval_,
+ size_t optvallen_)
+{
+ // No special options for this socket type.
+ errno = EINVAL;
+ return -1;
+}
+
+int zmq::upstream_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+ errno = ENOTSUP;
+ return -1;
+}
+
+int zmq::upstream_t::xflush ()
+{
+ errno = ENOTSUP;
+ return -1;
+}
+
+int zmq::upstream_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+ // Deallocate old content of the message.
+ zmq_msg_close (msg_);
+
+ // Round-robin over the pipes to get next message.
+ for (int count = active; count != 0; count--) {
+ bool fetched = pipes [current]->read (msg_);
+ current++;
+ if (current >= active)
+ current = 0;
+ if (fetched)
+ return 0;
+ }
+
+ // No message is available. Initialise the output parameter
+ // to be a 0-byte message.
+ zmq_msg_init (msg_);
+ errno = EAGAIN;
+ return -1;
+}
+
+bool zmq::upstream_t::xhas_in ()
+{
+ // Note that messing with current doesn't break the fairness of fair
+ // queueing algorithm. If there are no messages available current will
+ // get back to its original value. Otherwise it'll point to the first
+ // pipe holding messages, skipping only pipes with no messages available.
+ for (int count = active; count != 0; count--) {
+ if (pipes [current]->check_read ())
+ return true;
+ current++;
+ if (current >= active)
+ current = 0;
+ }
+
+ return false;
+}
+
+bool zmq::upstream_t::xhas_out ()
+{
+ return false;
+}
+