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Diffstat (limited to 'src/xpub.cpp')
| -rw-r--r-- | src/xpub.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/xpub.cpp b/src/xpub.cpp new file mode 100644 index 0000000..1659d6f --- /dev/null +++ b/src/xpub.cpp @@ -0,0 +1,171 @@ +/* + 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; +} + |