org.jboss.cache.interceptors
Class ActivationInterceptor

java.lang.Object
  org.jboss.cache.interceptors.Interceptor
      org.jboss.cache.interceptors.CacheLoaderInterceptor
          org.jboss.cache.interceptors.ActivationInterceptor

All Implemented Interfaces:

ActivationInterceptorMBean, CacheLoaderInterceptorMBean, InterceptorMBean

public class ActivationInterceptor
extends CacheLoaderInterceptor
implements ActivationInterceptorMBean

Loads nodes that don't exist at the time of the call into memory from the CacheLoader. If the nodes were evicted earlier then we remove them from the cache loader after their attributes have been initialized and their children have been loaded in memory.

Version:

$Id: ActivationInterceptor.java 4149 2007-07-17 02:03:26Z msurtani $

Author:

{Hany Mesha}

Field Summary

protected static Object	NULL
protected ConcurrentHashMap	transactions List that we have registered for
protected TransactionManager	tx_mgr
protected TransactionTable	tx_table

Fields inherited from class org.jboss.cache.interceptors.CacheLoaderInterceptor

isActivation, loader, useCacheStore, usingOptimisticInvalidation

Fields inherited from class org.jboss.cache.interceptors.Interceptor

cache, configuration, last, log, next

Constructor Summary

ActivationInterceptor()

Method Summary

Map<String,Object>	dumpStatistics() This implementation returns an empty Map.
long	getActivations() Returns the number of cache node activations
protected boolean	hasModifications(Object[] args)
Object	invoke(InvocationContext ctx) Makes sure a node is loaded into memory before a call executes.
void	resetStatistics() This implementation is a no-op.

Methods inherited from class org.jboss.cache.interceptors.CacheLoaderInterceptor

getCacheLoaderLoads, getCacheLoaderMisses, getNode, lock, setCache

Methods inherited from class org.jboss.cache.interceptors.Interceptor

getLast, getNext, getStatisticsEnabled, isActive, isOnePhaseCommitPrepareMehod, isPreparing, isValid, setLast, setNext, setStatisticsEnabled, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jboss.cache.interceptors.CacheLoaderInterceptorMBean

getCacheLoaderLoads, getCacheLoaderMisses

Methods inherited from interface org.jboss.cache.interceptors.InterceptorMBean

getStatisticsEnabled, setStatisticsEnabled

Field Detail

tx_mgr

protected TransactionManager tx_mgr

tx_table

protected TransactionTable tx_table

transactions

protected ConcurrentHashMap transactions

List that we have registered for

NULL

protected static final Object NULL

Constructor Detail

ActivationInterceptor

public ActivationInterceptor()

Method Detail

invoke

public Object invoke(InvocationContext ctx)
              throws Throwable

Makes sure a node is loaded into memory before a call executes. If node is already loaded and its attributes already initialized, then remove it from the cache loader and notify the cache listeners that the node has been activated.

Overrides:

invoke in class CacheLoaderInterceptor

Returns:

Throws:

Throwable

getActivations

public long getActivations()

Description copied from interface: ActivationInterceptorMBean

Returns the number of cache node activations

Specified by:

getActivations in interface ActivationInterceptorMBean

Returns:

the number of cache node activations

resetStatistics

public void resetStatistics()

Description copied from class: Interceptor

This implementation is a no-op. If individual Interceptors wish to expose statistics, they can override this method.

Specified by:

resetStatistics in interface InterceptorMBean

Overrides:

resetStatistics in class CacheLoaderInterceptor

dumpStatistics

public Map<String,Object> dumpStatistics()

Description copied from class: Interceptor

This implementation returns an empty Map. If individual Interceptors wish to expose statistics, they can override this method.

Specified by:

dumpStatistics in interface InterceptorMBean

Overrides:

dumpStatistics in class CacheLoaderInterceptor

Returns:

a map containing statistics

hasModifications

protected boolean hasModifications(Object[] args)