public  void create() throws Exception
create the service, do expensive operations etc

 public  void destroy()
destroy the service, tear down

 public  void flush()
Flushes the cached objects from the cache.

 public Object get(Object key)
Returns the object paired with the specified key if it's
present in the cache, otherwise must return null. 

Implementations of this method must have complexity of order O(1).
Differently from #peek  this method not only return whether
the object is present in the cache or not, but also
applies the implemented policy that will "refresh" the cached
object in the cache, because this cached object
was really requested.

 public  void insert(Object key,
    Object object)
Inserts the specified object into the cache following the
implemented policy. 

Implementations of this method must have complexity of order O(1).

 public Object peek(Object key)
Returns the object paired with the specified key if it's
present in the cache, otherwise must return null. 

Implementations of this method must have complexity of order O(1).
This method should not apply the implemented caching policy to the
object paired with the given key, so that a client can
query if an object is cached without "refresh" its cache status. Real
requests for the object must be done using #get .

 public  void remove(Object key)
Remove the cached object paired with the specified key. 

Implementations of this method must have complexity of order O(1).

 public int size()
Get the size of the cache.

 public  void start() throws Exception
start the service, create is already called

 public  void stop()
stop the service