kodo.datacache
Class QueryKeyExpirationListener

java.lang.Object
  |
  +--kodo.datacache.QueryKeyExpirationListener

All Implemented Interfaces:

ExpirationListener

public class QueryKeyExpirationListener

extends Object

implements ExpirationListener

Expires querys results when an included object expires from the main data cache.

Constructor Summary

QueryKeyExpirationListener(QueryCache cache)

Method Summary

void	onExpire(ExpirationEvent event) Notification that an object has expired from the cache.
void	registerQueryKey(Object key, QueryKey qk) Registers qk with oid so that notification of expiration of oid can potentially result in the query associated with qk being expired.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryKeyExpirationListener

public QueryKeyExpirationListener(QueryCache cache)

Method Detail

registerQueryKey

public void registerQueryKey(Object key,
                             QueryKey qk)

Registers qk with oid so that notification of expiration of oid can potentially result in the query associated with qk being expired. This is useful because if a substantial number of objects in qk's result list are not in memory, it may actually be more efficient to execute the query against the database, rather than executing one-off queries along the way.

onExpire

public void onExpire(ExpirationEvent event)

Description copied from interface: ExpirationListener

Notification that an object has expired from the cache.

Specified by:

onExpire in interface ExpirationListener