Classe: Cache  - X-Ref

Cache is a base class for cache implementations.

The pear cache module is a generic data cache which can be used to
cache script runs. The idea behind the cache is quite simple. If you have
the same input parameters for whatever tasks/algorithm you use you'll
usually get the same output. So why not caching templates, functions calls,
graphic generation etc. Caching certain actions e.g. XSLT tranformations
saves you lots of time.

The design of the cache reminds of PHPLibs session implementation. A
(PHPLib: session) controller uses storage container (PHPLib: ct_*.inc) to save
certain data (PHPLib: session data). In contrast to the session stuff it's up to
you to generate an ID for the data to cache. If you're using the output cache
you might use the script name as a seed for cache::generateID(), if your using the
function cache you'd use an array with all function parameters.

Usage example of the generic data cache:

require_once('Cache.php');

$cache = new Cache('file', array('cache_dir' => 'cache/') );
$id = $cache->generateID('testentry');

if ($data = $cache->get($id)) {
print "Cache hit.<br>Data: $data";

} else {
$data = 'data of any kind';
$cache->save($id, $data);
print 'Cache miss.<br>';
}

WARNING: No File/DB-Table-Row locking is implemented yet,
it's possible, that you get corrupted data-entries under
bad circumstances  (especially with the file container)