Steffen Müller >
Queue-Q-0.18 >
Queue::Q::NaiveFIFO

Queue::Q::NaiveFIFO - Very primitive FIFO queue

use Queue::Q::NaiveFIFO::Redis; # or ::Perl

Abstract interface class for a naive FIFO queue without resilience against crashing workers. Implementations are required to provide strict ordering and adhere to the run-time complexities listed below (or better).

Given a data structure, that data structure is added to the queue. Items enqueued with `enqueue_item`

in order must be returned by `claim_item`

in the same order.

Complexity: O(1)

Given a number data structures, enqueues them in order. This is conceptually the same as calling `enqueue_item`

multiple times, but may help save on network round-trips.

Complexity: O(n) where n is the number of items to enqueue.

Returns the oldest item in the queue. Returns `undef`

if there is none left.

Complexity: O(1)

As `enqueue_items`

is to `enqueue_item`

, `claim_items`

is to `claim_item`

. Takes one optional parameter (defaults to 1): The number of items to fetch and return:

my @items = $q->claim_items(20); # returns a batch of 20 items

If there are less than the desired number of items to be claimed, returns a correspondingly shorter list.

Complexity: O(n) where n is the number of items claimed.

Returns the number of items available in the queue.

Complexity: O(1)

Removes all content in the queue.

Complexity: O(n) where n is the number of items in the queue.

Steffen Mueller, <smueller@cpan.org>

Copyright (C) 2012 by Steffen Mueller

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.1 or, at your option, any later version of Perl 5 you may have available.

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