org.jboss.util
Class FastKey

java.lang.Object
  |
  +--org.jboss.ejb.CacheKey
        |
        +--org.jboss.util.FastKey

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

public class FastKey

extends CacheKey

implements java.io.Externalizable

FastKey FastKey is a hack to enable fool proof and fast operation of caches for Entity In the case of complex PK if a developer misses hash and equals the maps won't properly work in jboss. Here we provide an wrapper to the DB Key and the hash is over-written so that we never miss a hit in cache and have constant speed.

Version:

$Revision: 1.8 $

Author:

Marc Fleury

See Also:

org.jboss.ejb.plugins.NoPassivationInstanceCache.java, Serialized Form

Field Summary

protected java.lang.Long

fastKey

Fields inherited from class org.jboss.ejb.CacheKey

hashCode, id, mo

Constructor Summary

FastKey()

FastKey(java.lang.Object id)

Method Summary

boolean	equals(java.lang.Object object) equals() We base the equals on the equality of the underlying key in this fashion we make sure that we cannot have duplicate hashes in the maps.
java.lang.Object	getPrimaryKey()
int	hashCode() these should be overwritten by extending Cache key since they define what the cache does in the first place
protected java.lang.Long	nextFastKey()
void	readExternal(java.io.ObjectInput in)
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class org.jboss.ejb.CacheKey

getId, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

fastKey

protected java.lang.Long fastKey

Constructor Detail

FastKey

public FastKey()

FastKey

public FastKey(java.lang.Object id)

Method Detail

getPrimaryKey

public java.lang.Object getPrimaryKey()

nextFastKey

protected java.lang.Long nextFastKey()

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class CacheKey

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class CacheKey

hashCode

public int hashCode()

Description copied from class: CacheKey

these should be overwritten by extending Cache key since they define what the cache does in the first place

Overrides:

hashCode in class CacheKey

equals

public boolean equals(java.lang.Object object)

Description copied from class: CacheKey

equals() We base the equals on the equality of the underlying key in this fashion we make sure that we cannot have duplicate hashes in the maps. The fast way (and right way) to do this implementation is with a incremented cachekey. It is more complex but worth the effort this is a FIXME (MF) The following implementation is fool-proof

Overrides:

equals in class CacheKey