1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
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
75
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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
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 <string.h>
#include "xpub.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "msg.hpp"
zmq::xpub_t::xpub_t (class ctx_t *parent_, uint32_t tid_) :
socket_base_t (parent_, tid_),
more (false)
{
options.type = ZMQ_XPUB;
}
zmq::xpub_t::~xpub_t ()
{
}
void zmq::xpub_t::xattach_pipe (pipe_t *pipe_)
{
zmq_assert (pipe_);
dist.attach (pipe_);
// The pipe is active when attached. Let's read the subscriptions from
// it, if any.
xread_activated (pipe_);
}
void zmq::xpub_t::xread_activated (pipe_t *pipe_)
{
// There are some subscriptions waiting. Let's process them.
msg_t sub;
sub.init ();
while (true) {
// Grab next subscription.
if (!pipe_->read (&sub)) {
sub.close ();
return;
}
// Apply the subscription to the trie.
unsigned char *data = (unsigned char*) sub.data ();
size_t size = sub.size ();
zmq_assert (size > 0 && (*data == 0 || *data == 1));
bool unique;
if (*data == 0)
unique = subscriptions.rm (data + 1, size - 1, pipe_);
else
unique = subscriptions.add (data + 1, size - 1, pipe_);
// If the subscription is not a duplicate store it so that it can be
// passed to used on next recv call.
if (unique && options.type != ZMQ_PUB)
pending.push_back (blob_t ((unsigned char*) sub.data (),
sub.size ()));
}
}
void zmq::xpub_t::xwrite_activated (pipe_t *pipe_)
{
dist.activated (pipe_);
}
void zmq::xpub_t::xterminated (pipe_t *pipe_)
{
// Remove the pipe from the trie. If there are topics that nobody
// is interested in anymore, send corresponding unsubscriptions
// upstream.
subscriptions.rm (pipe_, send_unsubscription, this);
dist.terminated (pipe_);
}
void zmq::xpub_t::mark_as_matching (pipe_t *pipe_, void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
self->dist.match (pipe_);
}
int zmq::xpub_t::xsend (msg_t *msg_, int flags_)
{
bool msg_more =
msg_->flags () & (msg_t::more | msg_t::label) ? true : false;
// For the first part of multi-part message, find the matching pipes.
if (!more)
subscriptions.match ((unsigned char*) msg_->data (), msg_->size (),
mark_as_matching, this);
// Send the message to all the pipes that were marked as matching
// in the previous step.
int rc = dist.send_to_matching (msg_, flags_);
if (rc != 0)
return rc;
// If we are at the end of multi-part message we can mark all the pipes
// as non-matching.
if (!msg_more)
dist.unmatch ();
more = msg_more;
return 0;
}
bool zmq::xpub_t::xhas_out ()
{
return dist.has_out ();
}
int zmq::xpub_t::xrecv (msg_t *msg_, int flags_)
{
// If there is at least one
if (pending.empty ()) {
errno = EAGAIN;
return -1;
}
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init_size (pending.front ().size ());
errno_assert (rc == 0);
memcpy (msg_->data (), pending.front ().data (),
pending.front ().size ());
pending.pop_front ();
return 0;
}
bool zmq::xpub_t::xhas_in ()
{
return !pending.empty ();
}
void zmq::xpub_t::send_unsubscription (unsigned char *data_, size_t size_,
void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
if (self->options.type != ZMQ_PUB) {
// Place the unsubscription to the queue of pending (un)sunscriptions
// to be retrived by the user later on.
xpub_t *self = (xpub_t*) arg_;
blob_t unsub (size_ + 1, 0);
unsub [0] = 0;
memcpy (&unsub [1], data_, size_);
self->pending.push_back (unsub);
}
}
zmq::xpub_session_t::xpub_session_t (io_thread_t *io_thread_, bool connect_,
socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
session_base_t (io_thread_, connect_, socket_, options_, protocol_,
address_)
{
}
zmq::xpub_session_t::~xpub_session_t ()
{
}
|
