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Mary Ehlers
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NAME

Piper::Role::Queue - Basic queue role used by the Piper system

DESCRIPTION

The role exists to support future subclassing of Piper (and testing such subclasses) with alternate queueing systems.

REQUIRES

This role requires the following object methods.

dequeue($num)

Removes and returns $num items from the queue.

Default $num should be 1. If wantarray, should return an array of items from the queue. Otherwise, should return the last of the dequeued items (allows singleton dequeues, behaving similar to splice):

  Ex:
  my @results = $queue->dequeue($num);
  my $single = $queue->dequeue;

If requesting more items than are left in the queue, should only return the items left in the queue (and should not return undefs as placeholders).

enqueue(@items)

Adds the @items to the queue. It should not matter what the @items contain, within reason.

ready

Returns the number of items that are ready to be dequeued.

requeue(@items)

Inserts the @items to the top of the queue in an order such that dequeue(1) would subsequently return $items[0] and so forth.

TESTING

Verify the functionality of a new queue class by downloading the Piper tests and running the following:

  PIPER_QUEUE_CLASS=<New queue class> prove t/01_Queue.t

SEE ALSO

Piper

VERSION

version 0.05

AUTHOR

Mary Ehlers <ehlers@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2017 by Mary Ehlers.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004