org.nees.util.cache
Interface Cacheable

public interface Cacheable

This interface is implemented by all operations whose results can be cached. Caching strategies call fetch when they want to retrieve an object by key. They may choose not to call this method if the object is already in the cache. Typically this method will be a relatively expensive method in terms of I/O or computation, so caching strategies will avoid calling this method except when it is the only way to retrieve the correct object.

Typical Usage:

Called by CachingStrategy implementations.

See Also:

CachingStrategy

Method Summary

java.lang.Object

fetch(java.lang.Object key) Fetch an object based on a key.

Method Detail

fetch

public java.lang.Object fetch(java.lang.Object key)
                       throws java.lang.Exception

Fetch an object based on a key.

Parameters:

key - the key

Returns:

the object

Throws:

java.lang.Exception