Dancer2::Plugin::Queue - Dancer2 plugin for message queue abstractions
version 0.004
# in config.yml
plugins:
Queue:
default:
class: Array
options:
name: not_a_real_queue
# in your app
use Dancer2::Plugin::Queue;
post '/add_fortune' => sub {
# assume a 'fortune' parameter submitted
queue->add_msg( params->{fortune} );
# ...
};
get '/tell_fortune' => sub {
my ($msg, $body) = queue->get_msg;
queue->remove_msg( $msg );
return "Your fortune: $body";
};
This module provides a generic interface to a message queue. Message queue implementations must implement the Dancer2::Plugin::Queue::Role::Queue role, which defines the interface to abstract the specifics of the backend.
Queue objects are defined by a NAME => HASHREF
pair. The hash reference must contain a 'class' key, whose value is a class name suffix that will be appended to Dancer2::Plugin::Queue::
. The resulting class will be loaded on demand. If the hash reference contains an 'options' key, its value will be passed to the constructor when the queue object is created.
queue;
queue($name);
This function returns a Dancer2::Plugin::Queue::*
object. If no $name
is provided, it attempts to return a default object. If there is only a single queue defined, it will be used as the default. If there is more than one, a queue called 'default' will be the default. If there are more than one and none are named 'default', an error will be thrown.
queue->add_msg( $data );
Adds $data
to the queue. It is up to the plugin implementation (or backend) to serialize or otherwise modify $data
.
( $msg, $data ) = queue->get_msg;
Dequeues a message from the queue. $msg
will be either a 'raw' message object from the backend or else an identifier that can be used with remove_msg
. $data
should ideally be the same as the enqueued $data
, subject to any round-trip limitations of the backend.
queue->remove_msg( $msg );
Removes a message permanently from the queue (if not already done by get_msg
).
Some message queue implementations require handled messages to be manually removed from the queue or else the message will time-out and be available again.
This method should always be called after a message has been handled in case the backend requires such cleanup. For implementations that do not have message durability, this method may do nothing.
Please report any bugs or feature requests through the issue tracker at https://github.com/dagolden/dancer2-plugin-queue/issues. You will be notified automatically of any progress on your issue.
This is open source software. The code repository is available for public review and contribution under the terms of the license.
https://github.com/dagolden/dancer2-plugin-queue
git clone git://github.com/dagolden/dancer2-plugin-queue.git
David Golden <[email protected]>
This software is Copyright (c) 2012 by David Golden.
This is free software, licensed under:
The Apache License, Version 2.0, January 2004