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FastKey (JBoss Server API) - JBoss 3.2.7 server API Documentation 英文版文档

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org.jboss.ejb
Class FastKey

java.lang.Object
  org.jboss.ejb.CacheKey
      org.jboss.ejb.FastKey

All Implemented Interfaces:

Externalizable, Serializable

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public class FastKey

extends CacheKey

implements 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: 1.1 $

Author:

Marc Fleury

See Also:

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

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Field Summary
protected  Long	fastKey

 

Fields inherited from class org.jboss.ejb.CacheKey

hashCode, id, mo

 

Constructor Summary

FastKey()

FastKey(Object id)

 

Method Summary
boolean	equals(Object object)           This method uses the id implementation of equals if the mo is null since this indicates that the id class did implement equals.
Object	getPrimaryKey()
int	hashCode()           these should be overwritten by extending Cache key since they define what the cache does in the first place
protected  Long	nextFastKey()
void	readExternal(ObjectInput in)
void	writeExternal(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 Long fastKey

Constructor Detail

FastKey

public FastKey()

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FastKey

public FastKey(Object id)

Method Detail

getPrimaryKey

public Object getPrimaryKey()

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nextFastKey

protected Long nextFastKey()

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writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class CacheKey

Throws:

IOException

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readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class CacheKey

Throws:

IOException

ClassNotFoundException

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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

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equals

public boolean equals(Object object)

Description copied from class: CacheKey

This method uses the id implementation of equals if the mo is null since this indicates that the id class did implement equals. If mo is not null, then the MarshalledObject equals is used to compare keys based on their serialized form. Relying on the serialized form does not always work.

Overrides:

equals in class CacheKey

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