/ 
MessageBus-0.04
/ MessageBus

NAME

MessageBus - Lightweight publish/subscribe messaging system

SYNOPSIS

# A new message bus with the DBM::Deep backend
# (Other possible backends include Memcached and PlainHash)
my $bus = MessageBus->new(DBM_Deep => '/tmp/bus.db');

# A channel is any arbitrary string
my $channel = '#perl6';

# Register a new publisher (you can publish to multiple channels)
my $pub = $bus->publish("#perl6", "#moose");

# Publish a message (may be a complex object) to those channels
$pub->msg("This is a message");

# Register a new subscriber (you can subscribe to multiple channels)
my $sub = $bus->subscribe("#moose");

# Publish an object to channels
$pub->msg("This is another message");

# Simple get: Returns the messages sent since the previous get,
# but only for the first channel.
my @msgs = $sub->get;

# Simple get, with an explicit channel key (must be among the ones
# it initially subscribed to)
my @msgs = $sub->get("#moose");

# Complex get: Returns a hash reference from channels to array
# references of [timestamp, message].
my $hash_ref = $sub->get_all;

DESCRIPTION

This module provides a simple message bus for publishing messages and subscribing to them.

Currently it offers three backends: DBM_Deep for on-disk storage, Memcached for possibly multi-host storage, and PlainHash for single-process storage.

Please see the tests in t/ for this distribution, as well as "SYNOPSIS" above, for some usage examples; detailed documentation is not yet available.

AUTHORS

Audrey Tang <cpan@audreyt.org>

COPYRIGHT (The "MIT" License)

Copyright 2002-2006 by Audrey Tang <cpan@audreyt.org>.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is fur- nished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT- NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.