CHI::Driver::Redis::SortedSet - Redis driver for CHI with proper expiration of namespace keys
use CHI;
my $cache = CHI->new(
driver => 'Redis::SortedSet',
namespace => 'products',
server => '127.0.0.1:6379',
debug => 0
);
Extends CHI::Driver::Redis to address memory leak issues from an unbound
set
holding the namespace members. This module implements the fix as
suggested in a feature request by Pieter Noordhuis as outlined
here.
The expiration mechanism is implemented as a lazy cleanup, transparently
invoked everytime store
is called via CHI::set()
.
Please note that this is not backwards compatible with existing Redis
datasets that have already been populated with entries via the
CHI::Driver::Redis module due to the underlying change in the data type
holding the list of all keys in the namespace as retrieved thru
CHI::get_keys()
.
Nothing.
Congratulations! You're in the best position to use this module instead of CHI::Driver::Redis if memory usage can become an issue based on your setup and use case.
I've been using CHI::Driver::Redis. How do I migrate to this new module?
The FLUSHDB command should first be issued. Please note that this will drop all existing keys and cached data and so is a destructive procedure.
Why not make the driver backwards compatible with CHI::Driver::Redis?
Yes, that's very much possible. And should likewise not be too costly as
it will only have to involve a one-time transparently-invoked migration to
migrate all previously-defined namespace members from the original set
to a sorted set
, with expiration values set from each key's
TTL.
However, it would be prudent that the memory leak is an actual issue being experienced by the developer before using this module. At this point, the developer should first be aware of the subtle changes which will happen under the hood.
As such, the author has made a judgment call to make this a conscious decision on the developer's part.
Why not send a pull request and incorporate this into CHI::Driver::Redis?
The author will first collaborate with the authors of CHI::Driver::Redis and if deemed acceptable, merge the modifications into the original code base so we won't have to deal with the confusion of having multiple CHI drivers doing pretty much the same thing.
Otherwise, this module will continue to exist on a different namespace to provide developers with this option.
CHI::purge()
is not implemented, just like CHI::Driver::Redis.
Arnold Tan Casis atancasis@cpan.org
This is based on the work by Cory G Watson <gphat at cpan.org> and Ian Burrell iburrell@cpan.org so all attributions should go to them.
Likewise, the fix implemented in this module is inspired by the suggestion of Pieter Noordhuis pcnoordhuis@gmail.com.
Copyright 2016- Arnold Tan Casis
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.