Node Removal In mvcc-entity Cache Through JMX Console

[frank.stillford]

When using the Entity Tree Cache in JBoss 4.2.2.GA, the JMX bean makes available a remove(String) method, that, when invoked, removes a given node from the cache.

Following the JBoss 5.0.0.GA cache article (available: http://www.jboss.org/community/docs/DOC-13200), I have migrated to the mvcc-entity cache. Unfortunately, I am unable to find a way to remove nodes from this cache without redeploying the application. Being able to remove nodes (in particular, those cached as read-only) from the cache is a critical need when redeployment in a production environment is not a viable option.

Is this functionality still available with the mvcc-entity cache? If not, are there any similar alternatives or workarounds?

[burnison]

"frank.stillford" wrote:
... If not, are there any similar alternatives or workarounds?

I have not found a way to invalidate entities out-of-the-box, but you can create your own MBean to accomplish the task. You can get a handle on the CacheManager through JNDI, and you can obtain a reference to the entity cache thusly:

public void remove(String jndi, String cacheName, String node) throws Exception
{
 CacheManager cm = null;
 Cache<?, ?> c = null;

 try{
 cm = this.getCacheManager(jndi);
 c = cm.getCache(cacheName, false);
 c.removeNode(node);
 } finally{
 if(c != null){
 try {
 cm.releaseCache(cacheName);
 } catch (NamingException ex) {
 }
 }
 }
}


private CacheManager getCacheManager(String jndi) throws NamingException
{
 Context ic = null;

 try{
 ic = new InitialContext();
 return (CacheManager)ic.lookup(jndi);
 } finally {
 if(ic != null) {
 try {
 ic.close();
 } catch (NamingException ex) {
 }
 }
 }
}

By default, the cache manager is bound to java:/CacheManager.

Regards,

Richard Burnison