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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 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/zmq.h"
+
+#include "xrep.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::xrep_t::xrep_t (class app_thread_t *parent_) :
+ socket_base_t (parent_),
+ current_in (0),
+ more_in (false),
+ current_out (NULL),
+ more_out (false)
+{
+ options.requires_in = true;
+ options.requires_out = true;
+
+ // On connect, pipes are created only after initial handshaking.
+ // That way we are aware of the peer's identity when binding to the pipes.
+ options.immediate_connect = false;
+}
+
+zmq::xrep_t::~xrep_t ()
+{
+ for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end (); it++)
+ it->reader->term ();
+ for (outpipes_t::iterator it = outpipes.begin (); it != outpipes.end ();
+ it++)
+ it->second.writer->term ();
+}
+
+void zmq::xrep_t::xattach_pipes (class reader_t *inpipe_,
+ class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+ zmq_assert (inpipe_ && outpipe_);
+
+ // TODO: What if new connection has same peer identity as the old one?
+ outpipe_t outpipe = {outpipe_, true};
+ bool ok = outpipes.insert (std::make_pair (
+ peer_identity_, outpipe)).second;
+ zmq_assert (ok);
+
+ inpipe_t inpipe = {inpipe_, peer_identity_, true};
+ inpipes.push_back (inpipe);
+}
+
+void zmq::xrep_t::xdetach_inpipe (class reader_t *pipe_)
+{
+// TODO:!
+ for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+ it++) {
+ if (it->reader == pipe_) {
+ inpipes.erase (it);
+ return;
+ }
+ }
+ zmq_assert (false);
+}
+
+void zmq::xrep_t::xdetach_outpipe (class writer_t *pipe_)
+{
+ for (outpipes_t::iterator it = outpipes.begin ();
+ it != outpipes.end (); ++it) {
+ if (it->second.writer == pipe_) {
+ outpipes.erase (it);
+ if (pipe_ == current_out)
+ current_out = NULL;
+ return;
+ }
+ }
+ zmq_assert (false);
+}
+
+void zmq::xrep_t::xkill (class reader_t *pipe_)
+{
+ for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+ it++) {
+ if (it->reader == pipe_) {
+ zmq_assert (it->active);
+ it->active = false;
+ return;
+ }
+ }
+ zmq_assert (false);
+}
+
+void zmq::xrep_t::xrevive (class reader_t *pipe_)
+{
+ for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+ it++) {
+ if (it->reader == pipe_) {
+ zmq_assert (!it->active);
+ it->active = true;
+ return;
+ }
+ }
+ zmq_assert (false);
+}
+
+void zmq::xrep_t::xrevive (class writer_t *pipe_)
+{
+ for (outpipes_t::iterator it = outpipes.begin ();
+ it != outpipes.end (); ++it) {
+ if (it->second.writer == pipe_) {
+ zmq_assert (!it->second.active);
+ it->second.active = true;
+ return;
+ }
+ }
+ zmq_assert (false);
+}
+
+int zmq::xrep_t::xsetsockopt (int option_, const void *optval_,
+ size_t optvallen_)
+{
+ errno = EINVAL;
+ return -1;
+}
+
+int zmq::xrep_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+ // If this is the first part of the message it's the identity of the
+ // peer to send the message to.
+ if (!more_out) {
+ zmq_assert (!current_out);
+
+ // There's no such thing as prefix with no subsequent message.
+ zmq_assert (msg_->flags & ZMQ_MSG_MORE);
+ more_out = true;
+
+ // Find the pipe associated with the identity stored in the prefix.
+ // If there's no such pipe just silently drop the message.
+ blob_t identity ((unsigned char*) zmq_msg_data (msg_),
+ zmq_msg_size (msg_));
+ outpipes_t::iterator it = outpipes.find (identity);
+ if (it == outpipes.end ())
+ return 0;
+
+ // Remember the outgoing pipe.
+ current_out = it->second.writer;
+
+ return 0;
+ }
+
+ // Check whether this is the last part of the message.
+ more_out = msg_->flags & ZMQ_MSG_MORE;
+
+ // Push the message into the pipe. If there's no out pipe, just drop it.
+ if (current_out) {
+ bool ok = current_out->write (msg_);
+ zmq_assert (ok);
+ if (!more_out) {
+ current_out->flush ();
+ current_out = NULL;
+ }
+ }
+ else {
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+ }
+
+ // Detach the message from the data buffer.
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+
+ return 0;
+}
+
+int zmq::xrep_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+ // Deallocate old content of the message.
+ zmq_msg_close (msg_);
+
+ // If we are in the middle of reading a message, just grab next part of it.
+ if (more_in) {
+ zmq_assert (inpipes [current_in].active);
+ bool fetched = inpipes [current_in].reader->read (msg_);
+ zmq_assert (fetched);
+ more_in = msg_->flags & ZMQ_MSG_MORE;
+ if (!more_in) {
+ current_in++;
+ if (current_in >= inpipes.size ())
+ current_in = 0;
+ }
+ return 0;
+ }
+
+ // Round-robin over the pipes to get the next message.
+ for (int count = inpipes.size (); count != 0; count--) {
+
+ // Try to fetch new message.
+ bool fetched;
+ if (!inpipes [current_in].active)
+ fetched = false;
+ else
+ fetched = inpipes [current_in].reader->check_read ();
+
+ // If we have a message, create a prefix and return it to the caller.
+ if (fetched) {
+ int rc = zmq_msg_init_size (msg_,
+ inpipes [current_in].identity.size ());
+ zmq_assert (rc == 0);
+ memcpy (zmq_msg_data (msg_), inpipes [current_in].identity.data (),
+ zmq_msg_size (msg_));
+ msg_->flags = ZMQ_MSG_MORE;
+ more_in = true;
+ return 0;
+ }
+
+ // If me don't have a message, move to next pipe.
+ current_in++;
+ if (current_in >= inpipes.size ())
+ current_in = 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::xrep_t::xhas_in ()
+{
+ // There are subsequent parts of the partly-read message available.
+ if (more_in)
+ return true;
+
+ // 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 = inpipes.size (); count != 0; count--) {
+ if (inpipes [current_in].active &&
+ inpipes [current_in].reader->check_read ())
+ return true;
+ current_in++;
+ if (current_in >= inpipes.size ())
+ current_in = 0;
+ }
+
+ return false;
+}
+
+bool zmq::xrep_t::xhas_out ()
+{
+ // In theory, XREP socket is always ready for writing. Whether actual
+ // attempt to write succeeds depends on whitch pipe the message is going
+ // to be routed to.
+ return true;
+}
+
+
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