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f0f16505e5
Copyrights had become ads for Sustrik's corporate sponsors, going against the original agreement to share copyrights with the community (that agreement was: one line stating iMatix copyright + one reference to AUTHORS file). The proliferation of corporate ads is also unfair to the many individual authors. I've removed ALL corporate title from the source files so the copyright statements can now be centralized in AUTHORS and source files can be properly updated on an annual basis.
143 lines
3.4 KiB
C++
143 lines
3.4 KiB
C++
/*
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Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "lb.hpp"
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#include "pipe.hpp"
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#include "err.hpp"
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#include "msg.hpp"
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zmq::lb_t::lb_t () :
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active (0),
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current (0),
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more (false),
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dropping (false)
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{
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}
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zmq::lb_t::~lb_t ()
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{
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zmq_assert (pipes.empty ());
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}
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void zmq::lb_t::attach (pipe_t *pipe_)
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{
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pipes.push_back (pipe_);
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activated (pipe_);
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}
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void zmq::lb_t::terminated (pipe_t *pipe_)
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{
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pipes_t::size_type index = pipes.index (pipe_);
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// If we are in the middle of multipart message and current pipe
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// have disconnected, we have to drop the remainder of the message.
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if (index == current && more)
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dropping = true;
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// Remove the pipe from the list; adjust number of active pipes
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// accordingly.
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if (index < active) {
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active--;
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pipes.swap (index, active);
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if (current == active)
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current = 0;
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}
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pipes.erase (pipe_);
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}
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void zmq::lb_t::activated (pipe_t *pipe_)
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{
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// Move the pipe to the list of active pipes.
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pipes.swap (pipes.index (pipe_), active);
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active++;
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}
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int zmq::lb_t::send (msg_t *msg_)
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{
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// Drop the message if required. If we are at the end of the message
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// switch back to non-dropping mode.
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if (dropping) {
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more = msg_->flags () & msg_t::more ? true : false;
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dropping = more;
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int rc = msg_->close ();
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errno_assert (rc == 0);
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rc = msg_->init ();
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errno_assert (rc == 0);
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return 0;
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}
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while (active > 0) {
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if (pipes [current]->write (msg_))
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break;
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zmq_assert (!more);
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active--;
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if (current < active)
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pipes.swap (current, active);
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else
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current = 0;
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}
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// If there are no pipes we cannot send the message.
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if (active == 0) {
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errno = EAGAIN;
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return -1;
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}
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// If it's final part of the message we can fluch it downstream and
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// continue round-robinning (load balance).
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more = msg_->flags () & msg_t::more? true: false;
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if (!more) {
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pipes [current]->flush ();
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current = (current + 1) % active;
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}
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// Detach the message from the data buffer.
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int rc = msg_->init ();
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errno_assert (rc == 0);
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return 0;
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}
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bool zmq::lb_t::has_out ()
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{
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// If one part of the message was already written we can definitely
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// write the rest of the message.
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if (more)
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return true;
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while (active > 0) {
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// Check whether a pipe has room for another message.
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if (pipes [current]->check_write ())
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return true;
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// Deactivate the pipe.
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active--;
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pipes.swap (current, active);
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if (current == active)
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current = 0;
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}
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return false;
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}
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