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
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
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 "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include <string.h>
#include <new>
#include "zmq_engine.hpp"
#include "zmq_connecter.hpp"
#include "io_thread.hpp"
#include "i_inout.hpp"
#include "config.hpp"
#include "err.hpp"
zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_,
const options_t &options_, bool reconnect_,
const char *protocol_, const char *address_) :
io_object_t (parent_),
inpos (NULL),
insize (0),
decoder (in_batch_size),
outpos (NULL),
outsize (0),
encoder (out_batch_size),
inout (NULL),
options (options_),
reconnect (reconnect_)
{
if (reconnect) {
protocol = protocol_;
address = address_;
}
// Initialise the underlying socket.
int rc = tcp_socket.open (fd_, options.sndbuf, options.rcvbuf);
zmq_assert (rc == 0);
}
zmq::zmq_engine_t::~zmq_engine_t ()
{
}
void zmq::zmq_engine_t::plug (i_inout *inout_)
{
zmq_assert (!inout);
encoder.set_inout (inout_);
decoder.set_inout (inout_);
handle = add_fd (tcp_socket.get_fd ());
set_pollin (handle);
set_pollout (handle);
inout = inout_;
// Flush all the data that may have been already received downstream.
in_event ();
}
void zmq::zmq_engine_t::unplug ()
{
rm_fd (handle);
encoder.set_inout (NULL);
decoder.set_inout (NULL);
inout = NULL;
}
void zmq::zmq_engine_t::in_event ()
{
bool disconnection = false;
// If there's no data to process in the buffer...
if (!insize) {
// Retrieve the buffer and read as much data as possible.
decoder.get_buffer (&inpos, &insize);
insize = tcp_socket.read (inpos, insize);
// Check whether the peer has closed the connection.
if (insize == (size_t) -1) {
insize = 0;
disconnection = true;
}
}
// Push the data to the decoder.
size_t processed = decoder.process_buffer (inpos, insize);
// Stop polling for input if we got stuck.
if (processed < insize) {
// This may happen if queue limits are in effect or when
// init object reads all required information from the socket
// and rejects to read more data.
reset_pollin (handle);
}
// Adjust the buffer.
inpos += processed;
insize -= processed;
// Flush all messages the decoder may have produced.
inout->flush ();
if (disconnection)
error ();
}
void zmq::zmq_engine_t::out_event ()
{
// If write buffer is empty, try to read new data from the encoder.
if (!outsize) {
outpos = NULL;
encoder.get_data (&outpos, &outsize);
// If there is no data to send, stop polling for output.
if (outsize == 0) {
reset_pollout (handle);
return;
}
}
// If there are any data to write in write buffer, write as much as
// possible to the socket.
int nbytes = tcp_socket.write (outpos, outsize);
// Handle problems with the connection.
if (nbytes == -1) {
error ();
return;
}
outpos += nbytes;
outsize -= nbytes;
}
void zmq::zmq_engine_t::revive ()
{
set_pollout (handle);
// Speculative write: The assumption is that at the moment new message
// was sent by the user the socket is probably available for writing.
// Thus we try to write the data to socket avoiding polling for POLLOUT.
// Consequently, the latency should be better in request/reply scenarios.
out_event ();
}
void zmq::zmq_engine_t::resume_input ()
{
set_pollin (handle);
in_event ();
}
void zmq::zmq_engine_t::error ()
{
zmq_assert (inout);
zmq_connecter_t *reconnecter = NULL;
if (reconnect) {
// Create a connecter object to attempt reconnect.
// Ask it to wait for a while before reconnecting.
reconnecter = new (std::nothrow) zmq_connecter_t (
inout->get_io_thread (), inout->get_owner (),
options, inout->get_ordinal (), true);
zmq_assert (reconnecter);
reconnecter->set_address (protocol.c_str(), address.c_str ());
}
inout->detach (reconnecter);
unplug ();
delete this;
}
|
