1Net::STOMP::Client(3) User Contributed Perl DocumentationNet::STOMP::Client(3)
2
6 Net::STOMP::Client - STOMP object oriented client module
7
9 #
10 # simple producer
11 #
12 use Net::STOMP::Client;
14 $stomp = Net::STOMP::Client->new(host => "127.0.0.1", port => 61613);
16 $stomp->connect(login => "guest", passcode => "guest");
17 $stomp->send(destination => "/queue/test", body => "hello world!");
18 $stomp->disconnect();
19 #
21 # consumer with client side acknowledgment
22 #
23 use Net::STOMP::Client;
25 $stomp = Net::STOMP::Client->new(host => "127.0.0.1", port => 61613);
27 $stomp->connect(login => "guest", passcode => "guest");
28 # declare a callback to be called for each received message frame
29 $stomp->message_callback(sub {
30 my($self, $frame) = @_;
31 $self->ack(frame => $frame);
32 printf("received: %s\n", $frame->body());
33 return($self);
34 });
35 # subscribe to the given queue
36 $stomp->subscribe(
37 destination => "/queue/test",
38 id => "testsub", # required in STOMP 1.1
39 ack => "client", # client side acknowledgment
40 );
41 # wait for a specified message frame
42 $stomp->wait_for_frames(callback => sub {
43 my($self, $frame) = @_;
44 if ($frame->command() eq "MESSAGE") {
45 # stop waiting for new frames if body is "quit"
46 return(1) if $frame->body() eq "quit";
47 }
48 # continue to wait for more frames
49 return(0);
50 });
51 $stomp->unsubscribe(id => "testsub");
52 $stomp->disconnect();
53
55 This module provides an object oriented client interface to interact
56 with servers supporting STOMP (Streaming Text Orientated Messaging
57 Protocol). It supports the major features of modern messaging brokers:
58 SSL, asynchronous I/O, receipts and transactions.
59
61 The new() method can be used to create a Net::STOMP::Client object that
62 will later be used to interact with a server. The following attributes
63 are supported:
64 "accept_version"
66 the STOMP version to use (string) or versions to use (reference to
67 a list of strings); this defaults to the list of all supported
68 versions; see Net::STOMP::Client::Version for more information
69 "version"
71 this attribute is obsolete and should not be used anymore, use
72 "accept_version" instead; it is left here only to provide backward
73 compatibility with Net::STOMP::Client 1.x
74 "uri"
76 the Uniform Resource Identifier (URI) specifying where the STOMP
77 service is and how to connect to it, this can be for instance
78 "tcp://msg01:6163" or something more complex, see
79 Net::STOMP::Client::Connection for more information
80 "host"
82 the server name or IP address
83 "port"
85 the port number of the STOMP service
86 "auth"
88 the authentication credential(s) to use, see
89 Net::STOMP::Client::Auth for more information
90 "sockopts"
92 arbitrary socket options (as a hash reference) that will be passed
93 to IO::Socket::IP->new() or IO::Socket::SSL->new()
94 "client_heart_beat"
96 the desired client-side heart-beat setting, see
97 Net::STOMP::Client::HeartBeat for more information
98 "server_heart_beat"
100 the desired server-side heart-beat setting, see
101 Net::STOMP::Client::HeartBeat for more information
102 "debug"
104 the debugging flags for this object, see the "DEBUGGING" section
105 for more information
106 "timeout"
108 the maximum time (in seconds) for various operations, see the
109 "TIMEOUTS" section for more information
110 Upon object creation, a TCP connection is made to the server but no
112 data (i.e. STOMP frame) is exchanged.
113 DEBUGGING
115 Net::STOMP::Client uses No::Worries::Log's log_debug() to log debugging
116 information. In addition, to avoid useless data massaging, it also uses
117 a debug string to specify what will be logged using log_debug().
118 The debug string should contain a list of words describing what to log.
120 For instance, "io" logs I/O information while "io connection" logs both
121 I/O and connection information.
122 Here are the supported debug words that can be used:
124 "all"
126 everything
127 "api"
129 high-level API calls
130 "body"
132 frame bodies
133 "command"
135 frame commands
136 "connection"
138 connection establishment
139 "header"
141 frame headers
142 "io"
144 I/O as bytes sent/received
145 To enable debugging, you must first configure No::Worries::Log so that
147 it indeed reports debugging messages. This can be done with something
148 like:
149 log_filter("debug");
151 or, to enable logging only from Net::STOMP::Client modules:
153 log_filter("debug caller=~^Net::STOMP::Client");
155 See the No::Worries::Log documentation for more information.
157 Then, you have to tell Net::STOMP::Client to indeed log what you want
159 to see. This can be done globally for all connections by setting the
160 global variable $Net::STOMP::Client::Debug:
161 $Net::STOMP::Client::Debug = "connection api";
163 or per connection via the new() method:
165 $stomp = Net::STOMP::Client->new(
167 uri => "stomp://mybroker:6163",
168 debug => "connection api",
169 );
170 TIMEOUTS
172 By default, when sending STOMP frames, the module waits until the frame
173 indeed has been sent (from the socket point of view). In case the
174 server is stuck or unusable, the module can therefore hang.
175 When creating the Net::STOMP::Client object, you can pass a "timeout"
177 attribute to better control how certain operations handle timeouts.
178 This attribute should contain a reference to hash with the following
180 keys:
181 connect
183 TCP-level timeout that will be given to the underlying
184 IO::Socket::IP or IO::Socket::SSL object (default: none)
185 connected
187 timeout used while waiting for the initial "CONNECTED" frame from
188 the broker (default: 10)
189 disconnect
191 timeout specifying how long the disconnect() method should wait for
192 a "RECEIPT" frame back in case the "DISCONNECT" frame contained a
193 receipt (default: 10)
194 receive
196 timeout used while trying to receive any frame (default: none)
197 send
199 timeout used while trying to send any frame (default: none)
200 All values are in seconds. No timeout means wait until the operation
202 succeeds.
203 As a shortcut, the "timeout" attribute can also be a scalar. In this
205 case, only the "connect", "connected" and "disconnect" operations use
206 this value.
207
209 With a Net::STOMP::Client object, the following methods can be used to
210 interact with the server. They match one-to-one the different commands
211 that a client frame can hold:
212 connect()
214 connect to server
215 disconnect()
217 disconnect from server
218 subscribe()
220 subscribe to something
221 unsubscribe()
223 unsubscribe from something
224 send()
226 send a message somewhere
227 ack()
229 acknowledge the reception of a message
230 nack()
232 acknowledge the rejection of a message (STOMP >=1.1 only)
233 begin()
235 begin/start a transaction
236 commit()
238 commit a transaction
239 abort()
241 abort/rollback a transaction
242 All these methods can receive options that will be passed directly as
244 frame headers. For instance:
245 $stomp->subscribe(
247 destination => "/queue/test",
248 id => "testsub",
249 ack => "client",
250 );
251 Some methods also support additional options:
253 send()
255 "body" or "body_reference": holds the body or body reference of the
256 message to be sent
257 ack()
259 "frame": holds the "MESSAGE" frame object to ack
260 nack()
262 "frame": holds the "MESSAGE" frame object to nack
263 Finally, all methods support "debug" and "timeout" options that will be
265 given to the send_frame() method called internally to send the crafted
266 frame.
267
269 In addition to the STOMP methods, the following ones are also
270 available:
271 new(OPTIONS)
273 return a new Net::STOMP::Client object (constructor)
274 peer()
276 return a Net::STOMP::Client::Peer object containing information
277 about the connected STOMP server
278 socket()
280 return the file handle of the socket connecting the client and the
281 server
282 server()
284 return the server header seen on the "CONNECTED" frame (if any)
285 session()
287 return the session identifier if connected or false otherwise
288 uuid()
290 return a universal pseudo-unique identifier to be used for instance
291 in receipts and transactions
292 wait_for_frames()
294 wait for frames coming from the server, see the next section for
295 more information
296 noop([timeout => TIMEOUT])
298 send an empty/noop frame i.e. a single newline byte, using
299 send_frame() underneath
300
302 Since STOMP is asynchronous (for instance, "MESSAGE" frames could be
303 sent by the server at any time), Net::STOMP::Client uses callbacks to
304 handle frames. There are in fact two levels of callbacks.
305 First, there are per-command callbacks that will be called each time a
307 frame is handled (via the internal dispatch_frame() method).
308 Net::STOMP::Client implements default callbacks that should be
309 sufficient for all frames except "MESSAGE" frames, which should really
310 be handled by the coder. These callbacks should return undef on error,
311 something else on success.
312 Here is an example with a callback counting the messages received:
314 $stomp->message_callback(sub {
316 my($self, $frame) = @_;
317 $MessageCount++;
318 return($self);
319 });
320 Here are the methods that can be used to get or set these per-command
322 callbacks:
323 connected_callback([SUBREF])
325 error_callback([SUBREF])
326 message_callback([SUBREF])
327 receipt_callback([SUBREF])
328 These callbacks are somehow global and it is good practice not to
330 change them during a session. If you do not need a global message
331 callback, you can supply the dummy:
332 $stomp->message_callback(sub { return(1) });
334 Then, the wait_for_frames() method takes an optional callback argument
336 holding some code to be called for each received frame, after the per-
337 command callback has been called. This can be seen as a local callback,
338 only valid for the call to wait_for_frames(). This callback must return
339 undef on error, false if more frames are expected or true if
340 wait_for_frames() can now stop waiting for new frames and return.
341 Here are all the options that can be given to wait_for_frames():
343 callback
345 code to be called for each received frame (see above)
346 timeout
348 time to wait before giving up, undef means wait forever, this is
349 the default
350 once
352 wait only for one frame, within the given timeout
353 The return value of wait_for_frames() can be: false if no suitable
355 frame has been received, the received frame if there is no user
356 callback or the user callback return value otherwise.
357
359 Here is an example using transactions:
360 # create a unique transaction id
362 $tid = $stomp->uuid();
363 # begin the transaction
364 $stomp->begin(transaction => $tid);
365 # send two messages as part of this transaction
366 $stomp->send(
367 destination => "/queue/test1",
368 body => "message 1",
369 transaction => $tid,
370 );
371 $stomp->send(
372 destination => "/queue/test2",
373 body => "message 2",
374 transaction => $tid,
375 );
376 # commit the transaction
377 $stomp->commit(transaction => $tid);
378
380 It should be enough to use the high-level API and use, for instance,
381 the send() method to create a "MESSAGE" frame and send it in one go.
382 If you need lower level interaction, you can manipulate frames with the
384 Net::STOMP::Client::Frame module.
385 You can also use:
387 $stomp->dispatch_frame(FRAME, [OPTIONS])
389 dispatch one received frame by calling the appropriate callback;
390 supported options: "debug"
391 $stomp->send_frame(FRAME, [OPTIONS])
393 try to send the given frame object; supported options: "timeout"
394 and "debug"
395 $stomp->send_message(MESSAGE, [OPTIONS])
397 identical to send_frame() but taking a Messaging::Message object
398 $stomp->queue_frame(FRAME, [OPTIONS])
400 add the given frame to the outgoing buffer queue; supported
401 options: "debug"
402 $stomp->queue_message(MESSAGE, [OPTIONS])
404 identical to queue_frame() but taking a Messaging::Message object
405 $stomp->send_data([OPTIONS])
407 send all the queued data; supported options: "timeout" and "debug"
408 $stomp->receive_frame([OPTIONS])
410 try to receive a frame; supported options: "timeout" and "debug"
411 $stomp->receive_data([OPTIONS])
413 try to receive data (this data will be appended to the incoming
414 buffer); supported options: "timeout" and "debug"
415 $stomp->outgoing_buffer_length()
417 return the length (in bytes) of the outgoing buffer
418 $stomp->incoming_buffer_reference()
420 return a reference to the incoming buffer
421 In these methods, the "timeout" option can either be "undef" (meaning
423 block until it's done) or 0 (meaning do not block at all) or a positive
424 number (meaning block at most this number of seconds).
425
427 This module has been successfully tested against ActiveMQ, Apollo,
428 HornetQ and RabbitMQ brokers.
429 See Net::STOMP::Client::Version for the list of supported STOMP
431 protocol versions.
432
434 Messaging::Message, Net::STOMP::Client::Auth,
435 Net::STOMP::Client::Connection, Net::STOMP::Client::Frame,
436 Net::STOMP::Client::HeartBeat, Net::STOMP::Client::Peer,
437 Net::STOMP::Client::Receipt, Net::STOMP::Client::Tutorial,
438 Net::STOMP::Client::Version, No::Worries::Log.
439
441 Lionel Cons <http://cern.ch/lionel.cons>
442 Copyright (C) CERN 2010-2021
444perl v5.34.0 2021-10-18 Net::STOMP::Client(3)