Jifty::CAS(3)

NAME
Jifty::CAS - Jifty's Content-Addressable Storage facility

SYNOPSIS
  my $key = Jifty::CAS->publish('js' => 'all', $content,
                      { hash_with => $content, # default behaviour
                        content_type => 'application/x-javascript',
                      });

  $ie_key = Jifty::CAS->publish('js' => 'ie-only', $ie_content,
                      { hash_with => $ie_content,
                        content_type => 'application/x-javascript',
                      });

  $key = Jifty::CAS->key('js', 'ie-only');
  my $blob = Jifty::CAS->retrieve('js', $key);

DESCRIPTION
Provides an in-memory "md5"-addressed content store. Content is stored under a "domain", and can be addressed using wither the "key", which is an "md5" sum, or the "name", which simply stores the most recent key provided with that name.

BACKENDS
The default data store is an per-process, in-memory store. A memcached backed store is also available and has the benefits of sharing the cache across all instances of a Jifty app using Jifty::CAS. The memcached store is limited to objects less than 1MB in size, however.

METHODS

  publish DOMAIN NAME CONTENT METADATA
Publishes the given "CONTENT" at the address "DOMAIN" and "NAME". "METADATA" is an arbitrary hash; see Jifty::CAS::Blob for more. Returns the key on success, or undef on failure.

  key DOMAIN NAME
Returns the most recent key for the given pair of "DOMAIN" and "NAME", or undef if none such exists.

  retrieve DOMAIN KEY
Returns a Jifty::CAS::Blob for the given pair of "DOMAIN" and "KEY", or undef if none such exists.

  serve_by_name DOMAIN NAME REQUESTED_KEY
Intelligently serves up the content of the object at NAME (not REQUESTED_KEY) in DOMAIN. REQUESTED_KEY is currently used only to check if the content at NAME equals the content requested. If so, this method responds with an HTTP 304 status, indicating the content hasn't changed. This use case assumes that content is served to clients from the CAS with the CAS key (an MD5 sum) as the filename or part of it.

The "content_type" key in the requested object's metadata is expected to be set and is used for the HTTP response.

This method is usually called from a dispatcher rule. Returns the HTTP status code set by this method (possibly for your use in the dispatcher).