This marker interface declares a (sitemap) component as cacheable.
Although this interface is deprecated it is still used for compatibility!
CacheableProcessingComponent author: Carsten Ziegeler version: CVS $Id: Cacheable.java 433543 2006-08-22 06:22:54Z crossley $
Generate the unique key.
This key must be unique inside the space of this component.
This method must be invoked before the generateValidity() method.
The generated key or 0 if the componentis currently not cacheable.
Generate the validity object.
Before this method can be invoked the generateKey() method
must be invoked.
The generated validity object or null if thecomponent is currently not cacheable.