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## org.jboss.ejb.plugins
Class EntityInstanceCache

    java.lang.Object
      |
      +--org.jboss.ejb.plugins.AbstractInstanceCache
            |
            +--org.jboss.ejb.plugins.EntityInstanceCache

All Implemented Interfaces:
  ContainerPlugin, EntityCache, InstanceCache, MetricsConstants, Monitorable, Service, XmlLoadable

public class EntityInstanceCache
extends AbstractInstanceCache
implements EntityCache

Cache subclass for entity beans.

Version:
  $Revision: 1.7.2.1 $
Author:
  Simone Bordet, Bill Burke

Inner classes inherited from class org.jboss.ejb.plugins.AbstractInstanceCache
`AbstractInstanceCache.PassivationHelper`

Fields inherited from class org.jboss.ejb.plugins.AbstractInstanceCache
`log`

Fields inherited from interface org.jboss.monitor.MetricsConstants
`ACTIVITY, APPLICATION, BEAN, BEANCACHE_METRICS, CHECKPOINT, INVOCATION_METRICS, MEMORY_MONITOR, METHOD, PRIMARY_KEY, SYSTEM_METRICS, THREAD_MONITOR, TIME, TYPE`

Constructor Summary
`EntityInstanceCache()`

Method Summary
`protected EnterpriseContext` | `acquireContext()` Acquires an EnterpriseContext from the pool
`protected void` | `activate(EnterpriseContext ctx)` Activates the given EnterpriseContext
`protected boolean` | `canPassivate(EnterpriseContext ctx)` Returns whether the given context can be passivated or not
`java.lang.Object` | `createCacheKey(java.lang.Object id)` Returns the key used to cache the context
`protected void` | `freeContext(EnterpriseContext ctx)` Frees the given EnterpriseContext to the pool
`EnterpriseContext` | `get(java.lang.Object id)` Gets a bean instance from this cache given the identity.
`protected Container` | `getContainer()` Returns the container for this cache.
`protected java.lang.Object` | `getKey(EnterpriseContext ctx)` Returns the key used by the cache to map the given context
`protected void` | `passivate(EnterpriseContext ctx)` Passivates the given EnterpriseContext
`void` | `remove(java.lang.Object id)` Removes a bean instance from this cache given the identity.
`void` | `setContainer(Container c)` This callback is set by the container so that the plugin may access it
`protected void` | `setKey(java.lang.Object id, EnterpriseContext ctx)` Sets the given id as key for the given context

Methods inherited from class org.jboss.ejb.plugins.AbstractInstanceCache
`createMessage, destroy, getCache, getCacheLock, importXml, init, insert, isActive, isJMSMonitoringEnabled, logActivation, logPassivation, logPassivationPostponed, logPassivationScheduled, release, resetStatistic, retrieveStatistic, sample, schedulePassivation, sendMessage, setJMSMonitoringEnabled, start, stop, unschedulePassivation`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.jboss.ejb.InstanceCache
`insert, isActive, release`

Methods inherited from interface org.jboss.util.Service
`destroy, init, start, stop`

Constructor Detail

### EntityInstanceCache

    public EntityInstanceCache()

Method Detail

### setContainer

    public void setContainer(Container c)

  Description copied from interface: `ContainerPlugin`
  This callback is set by the container so that the plugin may access it
  Specified by:
    `setContainer` in interface `ContainerPlugin`
  Following copied from interface: `org.jboss.ejb.ContainerPlugin`
  Parameters:
    `con` - the container using this plugin

### createCacheKey

    public java.lang.Object createCacheKey(java.lang.Object id)

  Description copied from interface: `EntityCache`
  Returns the key used to cache the context
  Specified by:
    `createCacheKey` in interface `EntityCache`
  Following copied from interface: `org.jboss.ejb.EntityCache`
  Parameters:
    `id` - Object id / primary key
  Returns:
    Cache key

### get

    public EnterpriseContext get(java.lang.Object id)
                          throws java.rmi.RemoteException,
                                 java.rmi.NoSuchObjectException

  Description copied from interface: `InstanceCache`
  Gets a bean instance from this cache given the identity. This method may involve activation if the instance is not in the cache. Implementation should have O(1) complexity. This method is never called for stateless session beans.
  Specified by:
    `get` in interface `InstanceCache`
  Overrides:
    `get` in class `AbstractInstanceCache`
  Following copied from interface: `org.jboss.ejb.InstanceCache`
  Parameters:
    `id` - the primary key of the bean
  Returns:
    the EnterpriseContext related to the given id
  Throws:
    `java.rmi.RemoteException` - in case of illegal calls (concurrent / reentrant), NoSuchObjectException if the bean cannot be found.
  See Also:
    `InstanceCache.release(org.jboss.ejb.EnterpriseContext)`

### remove

    public void remove(java.lang.Object id)

  Description copied from interface: `InstanceCache`
  Removes a bean instance from this cache given the identity. Implementation should have O(1) complexity and guarantee proper locking.
  Specified by:
    `remove` in interface `InstanceCache`
  Overrides:
    `remove` in class `AbstractInstanceCache`
  Following copied from interface: `org.jboss.ejb.InstanceCache`
  Parameters:
    `id` - the pimary key of the bean
  See Also:
    `InstanceCache.insert(org.jboss.ejb.EnterpriseContext)`

### getKey

    protected java.lang.Object getKey(EnterpriseContext ctx)

  Description copied from class: `AbstractInstanceCache`
  Returns the key used by the cache to map the given context
  Overrides:
    `getKey` in class `AbstractInstanceCache`

### setKey

    protected void setKey(java.lang.Object id,
                          EnterpriseContext ctx)

  Description copied from class: `AbstractInstanceCache`
  Sets the given id as key for the given context
  Overrides:
    `setKey` in class `AbstractInstanceCache`

### getContainer

    protected Container getContainer()

  Description copied from class: `AbstractInstanceCache`
  Returns the container for this cache.
  Overrides:
    `getContainer` in class `AbstractInstanceCache`

### passivate

    protected void passivate(EnterpriseContext ctx)
                      throws java.rmi.RemoteException

  Description copied from class: `AbstractInstanceCache`
  Passivates the given EnterpriseContext
  Overrides:
    `passivate` in class `AbstractInstanceCache`

### activate

    protected void activate(EnterpriseContext ctx)
                     throws java.rmi.RemoteException

  Description copied from class: `AbstractInstanceCache`
  Activates the given EnterpriseContext
  Overrides:
    `activate` in class `AbstractInstanceCache`

### acquireContext

    protected EnterpriseContext acquireContext()
                                        throws java.lang.Exception

  Description copied from class: `AbstractInstanceCache`
  Acquires an EnterpriseContext from the pool
  Overrides:
    `acquireContext` in class `AbstractInstanceCache`

### freeContext

    protected void freeContext(EnterpriseContext ctx)

  Description copied from class: `AbstractInstanceCache`
  Frees the given EnterpriseContext to the pool
  Overrides:
    `freeContext` in class `AbstractInstanceCache`

### canPassivate

    protected boolean canPassivate(EnterpriseContext ctx)

  Description copied from class: `AbstractInstanceCache`
  Returns whether the given context can be passivated or not
  Overrides:
    `canPassivate` in class `AbstractInstanceCache`

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