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-rw-r--r--src/xpub.cpp171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/xpub.cpp b/src/xpub.cpp
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+/*
+ 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/>.
+*/
+
+#include "../include/zmq.h"
+
+#include "xpub.hpp"
+#include "err.hpp"
+#include "msg_content.hpp"
+#include "pipe.hpp"
+
+zmq::xpub_t::xpub_t (class ctx_t *parent_, uint32_t tid_) :
+ socket_base_t (parent_, tid_),
+ active (0),
+ terminating (false)
+{
+ options.type = ZMQ_PUB;
+ options.requires_in = false;
+ options.requires_out = true;
+}
+
+zmq::xpub_t::~xpub_t ()
+{
+ zmq_assert (pipes.empty ());
+}
+
+void zmq::xpub_t::xattach_pipes (class reader_t *inpipe_,
+ class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+ zmq_assert (!inpipe_);
+
+ outpipe_->set_event_sink (this);
+
+ pipes.push_back (outpipe_);
+ pipes.swap (active, pipes.size () - 1);
+ active++;
+
+ if (terminating) {
+ register_term_acks (1);
+ outpipe_->terminate ();
+ }
+}
+
+void zmq::xpub_t::process_term (int linger_)
+{
+ terminating = true;
+
+ // Start shutdown process for all the pipes.
+ for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+ pipes [i]->terminate ();
+
+ // Wait for pipes to terminate before terminating yourself.
+ register_term_acks (pipes.size ());
+
+ // Continue with the termination immediately.
+ socket_base_t::process_term (linger_);
+}
+
+void zmq::xpub_t::activated (writer_t *pipe_)
+{
+ // Move the pipe to the list of active pipes.
+ pipes.swap (pipes.index (pipe_), active);
+ active++;
+}
+
+void zmq::xpub_t::terminated (writer_t *pipe_)
+{
+ // Remove the pipe from the list; adjust number of active pipes
+ // accordingly.
+ if (pipes.index (pipe_) < active)
+ active--;
+ pipes.erase (pipe_);
+
+ // If we are already terminating, wait for one term ack less.
+ if (terminating)
+ unregister_term_ack ();
+}
+
+int zmq::xpub_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+ // If there are no active pipes available, simply drop the message.
+ if (active == 0) {
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+ rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return 0;
+ }
+
+ msg_content_t *content = (msg_content_t*) msg_->content;
+
+ // For VSMs the copying is straighforward.
+ if (content == (msg_content_t*) ZMQ_VSM) {
+ for (pipes_t::size_type i = 0; i < active;)
+ if (write (pipes [i], msg_))
+ i++;
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return 0;
+ }
+
+ // Optimisation for the case when there's only a single pipe
+ // to send the message to - no refcount adjustment i.e. no atomic
+ // operations are needed.
+ if (active == 1) {
+ if (!write (pipes [0], msg_)) {
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+ }
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return 0;
+ }
+
+ // 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 -1).
+ if (msg_->flags & ZMQ_MSG_SHARED)
+ content->refcnt.add (active - 1);
+ else {
+ content->refcnt.set (active);
+ msg_->flags |= ZMQ_MSG_SHARED;
+ }
+
+ // Push the message to all destinations.
+ for (pipes_t::size_type i = 0; i < active;) {
+ if (!write (pipes [i], msg_))
+ content->refcnt.sub (1);
+ else
+ i++;
+ }
+
+ // Detach the original message from the data buffer.
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+
+ return 0;
+}
+
+bool zmq::xpub_t::xhas_out ()
+{
+ return true;
+}
+
+bool zmq::xpub_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
+{
+ if (!pipe_->write (msg_)) {
+ active--;
+ pipes.swap (pipes.index (pipe_), active);
+ return false;
+ }
+ if (!(msg_->flags & ZMQ_MSG_MORE))
+ pipe_->flush ();
+ return true;
+}
+