NAME

Redis::DistLock - Distributed lock manager using Redis

SYNOPSIS

use Redis::DistLock;
my $rd = Redis::DistLock->new( servers => [qw[ localhost:6379 ]] );
my $mutex = $rd->lock( "foo", 10 );
die( "failed to get a lock" )
    if ! $mutex;
# ... critical section ...
$rd->release( $mutex );

DESCRIPTION

This is an implementation of the Redlock algorithm using Redis for distributed lock management.

NOTE: This needs at least Redis version 2.6.12 which adds new options to the SET command making this implementation possible.

METHODS

new( ... )

• servers

  Array reference with servers to connect to or Redis objects to use.

• retry_count

  Maximum number of times to try to acquire the lock. Defaults to 3.

• retry_delay

  Maximum delay between retries in seconds. Defaults to 0.2.

• version_check

  Flag to check redis server version(s) in the constructor to ensure compatibility. Defaults to 1.

lock( $resource, $ttl [ $value ] )

Acquire the lock for the resource with the given time to live (in seconds) until the lock expires. Without a value will generate a unique identifier.

release( $lock )

Release the previously acquired lock.

SEE ALSO

http://redis.io/topics/distlock

DISCLAIMER

This code implements an algorithm which is currently a proposal, it was not formally analyzed. Make sure to understand how it works before using it in production environments.

ACKNOWLEDGMENT

This module was originally developed at Booking.com. With approval from Booking.com, this module was released as open source, for which the author would like to express his gratitude.

AUTHOR

Simon Bertrang, janus@cpan.org

COPYRIGHT AND LICENSE

Copyright (C) 2014 by Simon Bertrang

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