NAME

Redis::Client::Zset - Work with Redis ordered sets (zsets)

VERSION

version 0.009

SYNOPSIS

use Redis::Client;

my $client = Redis::Client->new;
tie my %set, 'Redis::Client::Zset', key => 'my_zset', client => $client;

my @members = keys %zset;
$zset{foo} = 0.6;
print 1 if exists $zset{bar};

DESCRIPTION

This class provides a tied interface for Redis sorted sets (zsets). Redis zsets are mapped to Perl hashes. Like Perl hashes, Redis zsets contain an unordered group of "members" which are mapped to keys in the hash. The values in a hash tied to a Redis zset are numeric scores which control the sort order. Adding a value to a Redis set will cause the member to be created if it does not already exist. The value determines the new member's ordering with respect to the other members.

Any time the hash is evaluated or the existence of a key is tested, the corresponding value will be fetched from the Redis store. Any time a key is added or deleted, the change will be written to the Redis store.

INTERFACE

The following Perl builtins will work the way you expect on Redis zsets.

delete

Removes a member from the zset. (Note that this is not the same as setting the value to undef, in which case the member still exists.)

delete $zset{foo};

exists

Check if a member exists in the zset.

print 1 if exists $zset{blargh};

keys

Retrieves a list of all members in the zset, in sorted order.

my @members = keys %zset;

values

Retrieves a list of all "values" in the zset. These are the numeric scores associated with each member. The list is returned sorted.

my @scores = values %zset;

each

Iterate over key/value pairs from the hash. The keys are the members and the values are the scores. The keys and values are returned in sorted order.

while( my ( $key, $val ) = each %zset ) { ... }

CAVEATS

As of Redis 2.4, emptying a zset (with e.g. %zset = ( ) is equivalent to deleting it from the store.

SEE ALSO

Redis::Client

EXTENDS

• Moose::Object

CONSUMES

• Redis::Client::Role::Tied

AUTHOR

Mike Friedman <friedo@friedo.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Mike Friedman.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.