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Java Source Code / Java Documentation » Search Engine » Jofti » com.jofti.api 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


com.jofti.api.IndexCache

IndexCache
public interface IndexCache extends CacheAccessor,Index(Code)
The main interface used by clients of index wrappers that are not Name Spaced.

The interface uses similar methods to the Map interface as most cache implementations can be easily adapted to these methods.

As with the Map classes the metaphors are to add an object use the put method, to retrieve an object use get(key) and to remove use remove(key).

The additional query method is for clients to query the cache by values other than the key. Please refer to the docs on IndexQuery.

It is important to realise that although the interface takes an Object as both key and value, some caches will only allow certain types of Objects to be inserted. Check with the actual cache provider used to determine these limitations.

The usage to obtain a cache is to create a com.jofti.manager.IndexManager then use the getIndexCache method to obtain a reference to the index. Where a listener implementation is available it is recommended to configure a listener adapter and perform the puts/gets directly on the cache implementation. This Inteface should be used where you want to be able to swap cache implmentations with no code change or you need to use a cache, such as Map, that has no callback capability.


author:
   Steve Woodcock (steve@jofti.com)

version:
   1.3





Method Summary
public  Objectget(Object key)
     Retrieves an object from the underlying cache instance.
public  voidput(Object key, Object value)
     Puts an object into the underlying cache instance and indexes the object according to the class definitions in the index config file.
public  voidremove(Object key)
     Deletes an object from the underlying cache.
public  voidremoveAll()
    



Method Detail
get
public Object get(Object key)(Code)
Retrieves an object from the underlying cache instance. The behaviour of the caches have been normalised so that a not found object will always return null - rather than throw an exception (as some caches do). A cache error (if any) will be tranformed into a log message only.


Parameters:
  key - -the key to retrieve the cached object the object mapped in the cache - or null if no object found.




put
public void put(Object key, Object value) throws JoftiException(Code)
Puts an object into the underlying cache instance and indexes the object according to the class definitions in the index config file. Some caches may only accept certain types of object.


Parameters:
  key - value to use as key in cache
Parameters:
  value - value to put into cache and to be indexed
throws:
  JoftiException - thrown as a wrapper exception that contains any cache specific exceptions.




remove
public void remove(Object key) throws JoftiException(Code)
Deletes an object from the underlying cache. Attempting to remove a non-existent, or expired object will not generate an exception. Note: this behaviour has been normalised so that all caches appear conform to this idipom. This will also remove the key/object from the index.


Parameters:
  key - -the key to retrieve the cached object
throws:
  JoftiException - - A wrapper for any cache specific exceptions or exceptions generated by the index.




removeAll
public void removeAll() throws JoftiException(Code)
This will remove all the values in the cache and dump the current index.


throws:
  JoftiException -




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