David Golden

NAME

Dancer2::Plugin::Queue - Dancer2 plugin for message queue abstractions

VERSION

version 0.004

SYNOPSIS

  # 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";
  };

DESCRIPTION

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.

CONFIGURATION

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.

USAGE

queue

  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

  queue->add_msg( $data );

Adds $data to the queue. It is up to the plugin implementation (or backend) to serialize or otherwise modify $data.

queue->get_msg

  ( $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

  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.

SUPPORT

Bugs / Feature Requests

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.

Source Code

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

AUTHOR

David Golden <dagolden@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2012 by David Golden.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004



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