Tim Keefer > Gantry > Gantry::Plugins::Cache::FastMmap

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NAME ^

Gantry::Plugins::Cache::FastMmap - A Plugin interface to a caching subsystem

SYNOPSIS ^

It is sometimes desireable to cache data between page accesess. This module gives access to the Cache::FastMmap module to store that data.

  <Perl>
     # ...
     use MyApp qw{ -Engine=CGI -TemplateEngine=TT Cache::FastMap };
  </Perl>

DESCRIPTION ^

This plugin mixes in methods to store data within a cache. This data is then available for later retrival. Data is stored within the cache by key/value pairs. There are no restrictions on what information can be stored. This cache is designed for short term data storage. Cached data items will be timed out and purged at regular intervals. The caching system also has the concept of namespace. Namespaces are being used to make key's unique. So you may store multiple unique data items within the cache.

CONFIGURATION ^

The following items can be set by configuration:

 cache_pages            the number of pages within the cache
 cache_pagesize         the sixe of those pages
 cache_expires          the expiration of items within the cache
 cache_filename         the cache filename

The following reasonable defaults are being used for those items:

 cache_pages            256
 cache_pagesize         256k
 cache_expires          1h
 cache_filename         /tmp/gantry.cache

Since this cache is being managed by Cache::FastMmap, any changes to those defaults should be consistent with that modules usage. Also note that memory consumption may seem excessive. This may cause problems on your system, so the Cache::FastMmap man pages will explain how to deal with those issue.

METHODS ^

cache_init

This method will initialize the cache. It should be called only once within the application.

 $self->cache_init();
cache_inited

For internal use.

Dual use accessor for init flag. If cache_init has run this attribute is 1, otherwise it's 0.

cache_namespace

This method will get/set the current namespace for cache operations.

 $self->cache_namespace($namespace);
cache_handle

This method returns the handle for the underlining cache. You can use this handle to manipulate the cache directly. Doing so will be highly specific to the underling cache handler.

 $handle = $self->cache_handle();
cache_purge

Equivalent to

 $self->cache_handle()->purge();
cache_get

This method returns the data associated with the current namespace/key combination.

 $self->cache_namespace($namespace);
 $data = $self->cache_get($key);
cache_set

This method stores the data associated with the current namespace/key combination.

 $self->cache_namespace($namespace);
 $self->cache_set($key, $data);
cache_keys

This method returns an arry reference of cache keys.

  my $arrayref = $self->cache_keys();
cache_clear

This method will clear the entire cache.

    $self->cache_clear();
cache_del

This method removes the data associated with the current namespace/key combination.

 $self->cache_namespace($namespace);
 $self->cache_del($key);
cache_expires

Retrieves the current expiration time for data items within the cache. The expiration time is set when the cache is initially initialize. So setting it will not change anything. Expiration time formats are highly specific to the underlining cache handler.

 $expiration = $self->cache_expires();

SEE ALSO ^

    Gantry

AUTHORS ^

Kevin L. Esteb <kesteb@wsipc.org>, Tim Keefer <tim@timkeefer.com>

COPYRIGHT AND LICENSE ^

Copyright (C) 2007 Kevin L. Esteb

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available.

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