From c98fd6bc3f2a49d7cb0b820a07354168c98f60b7 Mon Sep 17 00:00:00 2001 From: Martin Sustrik Date: Tue, 24 Nov 2009 11:23:10 +0100 Subject: ZMQII-25: Implement streamed request/reply --- src/upstream.cpp | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 src/upstream.cpp (limited to 'src/upstream.cpp') 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 . +*/ + +#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; +} + -- cgit v1.2.3