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.
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.
enqueue_items is to
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.
Removes all content in the queue.
Complexity: O(n) where n is the number of items in the queue.
Steffen Mueller, <email@example.com>
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.