Classe: TMemCache  - X-Ref

TMemCache class

TMemCache implements a cache application module based on {@link http://www.danga.com/memcached/ memcached}.

TMemCache can be configured with the Host and Port properties, which
specify the host and port of the memcache server to be used.
By default, they take the value 'localhost' and 11211, respectively.
These properties must be set before {@link init} is invoked.

The following basic cache operations are implemented:
- {@link get} : retrieve the value with a key (if any) from cache
- {@link set} : store the value with a key into cache
- {@link add} : store the value only if cache does not have this key
- {@link delete} : delete the value with the specified key from cache
- {@link flush} : delete all values from cache

Each value is associated with an expiration time. The {@link get} operation
ensures that any expired value will not be returned. The expiration time can
be specified by the number of seconds (maximum 60*60*24*30)
or a UNIX timestamp. A expiration time 0 represents never expire.

By definition, cache does not ensure the existence of a value
even if it never expires. Cache is not meant to be an persistent storage.

Also note, there is no security measure to protected data in memcache.
All data in memcache can be accessed by any process running in the system.

To use this module, the memcache PHP extension must be loaded.

Some usage examples of TMemCache are as follows,
<code>
$cache=new TMemCache;  // TMemCache may also be loaded as a Prado application module
$cache->init(null);
$cache->add('object',$object);
$object2=$cache->get('object');
</code>

If loaded, TMemCache will register itself with {@link TApplication} as the
cache module. It can be accessed via {@link TApplication::getCache()}.

TMemCache may be configured in application configuration file as follows
<code>
<module id="cache" class="System.Caching.TMemCache" Host="localhost" Port="11211" />
</code>
where {@link getHost Host} and {@link getPort Port} are configurable properties
of TMemCache.