1POE::Component::Client:U:sBearyeCuoxn(t3r)ibuted Perl DoPcOuEm:e:nCtoamtpioonnent::Client::Bayeux(3)
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NAME

6       POE::Component::Client::Bayeux - Bayeux/cometd client implementation in
7       POE
8

SYNOPSIS

10           use POE qw(Component::Client::Bayeux);
11
12           POE::Component::Client::Bayeux->spawn(
13               Host => '127.0.0.1',
14               Alias => 'comet',
15           );
16
17           POE::Session->create(
18               inline_states => {
19                   _start => sub {
20                       my ($kernel, $heap) = @_[KERNEL, HEAP];
21                       $kernel->alias_set('my_client');
22
23                       $kernel->post('comet', 'init');
24                       $kernel->post('comet', 'subscribe', '/chat/demo', 'events');
25                       $kernel->post('comet', 'publish', '/chat/demo', {
26                           user => "POE",
27                           chat => "POE has joined",
28                           join => JSON::XS::true,
29                       });
30                   },
31                   events => sub {
32                       my ($kernel, $heap, $message) = @_[KERNEL, HEAP, ARG0];
33
34                       print STDERR "Client got subscribed message:\n" . Dumper($message);
35                   },
36               },
37           );
38
39           $poe_kernel->run();
40

DESCRIPTION

42       This module implements the Bayeux Protocol (1.0draft1) from the Dojo
43       Foundation.  Also called cometd, Bayeux is a low-latency routing
44       protocol for JSON encoded events between clients and servers in a
45       publish-subscribe model.
46
47       This is the client implementation.  It is not feature complete, but
48       works at the moment for testing a Bayeux server.
49

USAGE

51   spawn (...)
52           Create a new Bayeux client.  Arguments to this method:
53
54           Host (required)
55               Connect to this host.
56
57           Port (default: 80)
58               Connect to this port.
59
60           SSL (default: 0)
61               Use SSL on connection
62
63           Alias (default: 'bayeux_client')
64               The POE session alias for local sessions to interact with.
65
66           Debug (default: 0)
67               Either 0 or 1, indicates level of logging.
68
69           LogFile (default: undef)
70               Logfile to write output to.
71
72           LogStdout (default: 1)
73               If false, no logger output to STDOUT.
74
75           CrossDomain (not implemented)
76               Enables cross domain protocol of messaging.
77
78           ErrorCallback (default: none)
79               Provide a coderef that will receive a message hashref of any
80               failed messages (erorrs in protocol, or simply unhandled
81               messages).
82
83           Returns a class object with methods of interest:
84
85           session
86               The POE::Session object returned from an internal create()
87               call.
88

POE STATES

90       The following are states you can post to to interact with the client.
91
92   init ()
93           Initializes the client, connecting to the server, and sets up long
94           polling.
95
96   publish ($channel, $message)
97           Publishes arbitrary message to the channel given.  Message will
98           have 'clientId' and 'id' fields auto-populated.
99
100   subscribe ($channel, $callback)
101           Subscribes client to the channel given.  Callback can either be a
102           coderef or the name of a state in the calling session.  Callback
103           will get one arg, the message that was posted to the channel
104           subscribed to.
105
106   unsubscribe ($channel)
107           Unsubscribes from channel.
108
109   disconnect ()
110           Sends a disconnect request.
111
112   reconnect ()
113           Disconnect and reconnect
114

TODO

116       Lots of stuff.
117
118       The code currently implements only the long-polling transport and
119       doesn't yet strictly follow all the directives in the protocol document
120       http://svn.xantus.org/shortbus/trunk/bayeux/bayeux.html
121

KNOWN BUGS

123       No known bugs, but I'm sure you can find some.
124

SEE ALSO

126       POE, POE::Component::Server::Bayeux, POE::Component::Client::HTTP
127

129       Copyright (c) 2008 Eric Waters and XMission LLC
130       (http://www.xmission.com/).  All rights reserved.  This program is free
131       software; you can redistribute it and/or modify it under the same terms
132       as Perl itself.
133
134       The full text of the license can be found in the LICENSE file included
135       with this module.
136

AUTHOR

138       Eric Waters <ewaters@uarc.com>
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142perl v5.34.0                      2022-01-21 POE::Component::Client::Bayeux(3)
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