rep.cpp 5.5 KB
Newer Older
1
/*
2
    Copyright (c) 2007-2010 iMatix Corporation
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

    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 "../bindings/c/zmq.h"

#include "rep.hpp"
#include "err.hpp"
#include "pipe.hpp"

zmq::rep_t::rep_t (class app_thread_t *parent_) :
27
    socket_base_t (parent_),
28 29 30 31 32
    active (0),
    current (0),
    waiting_for_reply (false),
    reply_pipe (NULL)
{
33
    options.type = ZMQ_REP;
34 35
    options.requires_in = true;
    options.requires_out = true;
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
}

zmq::rep_t::~rep_t ()
{
}

void zmq::rep_t::xattach_pipes (class reader_t *inpipe_,
    class writer_t *outpipe_)
{
    zmq_assert (inpipe_ && outpipe_);
    zmq_assert (in_pipes.size () == out_pipes.size ());

    in_pipes.push_back (inpipe_);
    in_pipes.swap (active, in_pipes.size () - 1);
    out_pipes.push_back (outpipe_);
    out_pipes.swap (active, out_pipes.size () - 1);
    active++;
}

void zmq::rep_t::xdetach_inpipe (class reader_t *pipe_)
{
    zmq_assert (pipe_);
    zmq_assert (in_pipes.size () == out_pipes.size ());

    in_pipes_t::size_type index = in_pipes.index (pipe_);

    //  If corresponding outpipe is still in place simply nullify the pointer
    //  to the inpipe and move it to the passive state.
    if (out_pipes [index]) {
        in_pipes [index] = NULL;
        if (in_pipes.index (pipe_) < active) {
            active--;
            in_pipes.swap (index, active);
            out_pipes.swap (index, active);
        }
        return;
    }

    //  Now both inpipe and outpipe are detached. Remove them from the lists.
75
    if (index < active)
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
        active--;
    in_pipes.erase (index);
    out_pipes.erase (index);
}

void zmq::rep_t::xdetach_outpipe (class writer_t *pipe_)
{
    zmq_assert (pipe_);
    zmq_assert (in_pipes.size () == out_pipes.size ());

    out_pipes_t::size_type index = out_pipes.index (pipe_);

    //  TODO: If the connection we've got the request from disconnects,
    //  there's nowhere to send the reply. DLQ?
    if (waiting_for_reply && pipe_ == reply_pipe) {
        zmq_assert (false);
    }

    //  If corresponding inpipe is still in place simply nullify the pointer
    //  to the outpipe.
    if (in_pipes [index]) {
        out_pipes [index] = NULL;
        if (out_pipes.index (pipe_) < active) {
            active--;
            in_pipes.swap (index, active);
            out_pipes.swap (index, active);
        }
        return;
    }

    //  Now both inpipe and outpipe are detached. Remove them from the lists.
    if (out_pipes.index (pipe_) < active)
        active--;
    in_pipes.erase (index);
    out_pipes.erase (index);
}

void zmq::rep_t::xkill (class reader_t *pipe_)
{
    //  Move the pipe to the list of inactive pipes.
    in_pipes_t::size_type index = in_pipes.index (pipe_);
    active--;
    in_pipes.swap (index, active);
    out_pipes.swap (index, active);
}

void zmq::rep_t::xrevive (class reader_t *pipe_)
{
    //  Move the pipe to the list of active pipes.
    in_pipes_t::size_type index = in_pipes.index (pipe_);
    in_pipes.swap (index, active);
    out_pipes.swap (index, active);
    active++;
}

int zmq::rep_t::xsetsockopt (int option_, const void *optval_,
    size_t optvallen_)
{
    errno = EINVAL;
    return -1;
}

138
int zmq::rep_t::xsend (zmq_msg_t *msg_, int flags_)
139 140
{
    if (!waiting_for_reply) {
141
        errno = EFSM;
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
        return -1;
    }

    //  TODO: Implement this once queue limits are in-place. If the reply
    //  overloads the buffer, connection should be torn down.
    zmq_assert (reply_pipe->check_write (zmq_msg_size (msg_)));

    //  Push message to the selected pipe.
    reply_pipe->write (msg_);
    reply_pipe->flush ();

    waiting_for_reply = false;
    reply_pipe = NULL;

    //  Detach the message from the data buffer.
    int rc = zmq_msg_init (msg_);
    zmq_assert (rc == 0);
Martin Sustrik's avatar
Martin Sustrik committed
159 160

    return 0;
161 162 163 164
}

int zmq::rep_t::xflush ()
{
165
    errno = ENOTSUP;
166 167 168
    return -1;
}

169
int zmq::rep_t::xrecv (zmq_msg_t *msg_, int flags_)
170 171 172 173 174
{
    //  Deallocate old content of the message.
    zmq_msg_close (msg_);

    if (waiting_for_reply) {
175
        errno = EFSM;
176 177 178 179 180 181 182 183 184 185
        return -1;
    }

    //  Round-robin over the pipes to get next message.
    for (int count = active; count != 0; count--) {
        bool fetched = in_pipes [current]->read (msg_);
        if (fetched) {
            reply_pipe = out_pipes [current];
            waiting_for_reply = true;
        }
186 187 188 189 190
        current++;
        if (current >= active)
            current = 0;
        if (fetched)
            return 0;
191 192 193 194 195 196 197 198 199
    }

    //  No message is available. Initialise the output parameter
    //  to be a 0-byte message.
    zmq_msg_init (msg_);
    errno = EAGAIN;
    return -1;
}

200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
bool zmq::rep_t::xhas_in ()
{
    for (int count = active; count != 0; count--) {
        if (in_pipes [current]->check_read ())
            return !waiting_for_reply;
        current++;
        if (current >= active)
            current = 0;
    }

    return false;
}

bool zmq::rep_t::xhas_out ()
{
    return waiting_for_reply;
}
217