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

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org.jboss.ejb.plugins
Class AbstractInstancePool

java.lang.Object
  org.jboss.mx.util.JBossNotificationBroadcasterSupport
      org.jboss.system.ServiceMBeanSupport
          org.jboss.ejb.plugins.AbstractInstancePool

All Implemented Interfaces:

AbstractInstancePoolMBean, ContainerPlugin, InstancePool, javax.management.MBeanRegistration, javax.management.NotificationBroadcaster, javax.management.NotificationEmitter, org.jboss.system.Service, org.jboss.system.ServiceMBean, XmlLoadable

Direct Known Subclasses:

EntityInstancePool, MessageDrivenInstancePool, StatefulSessionInstancePool, StatelessSessionInstancePool

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public abstract class AbstractInstancePool

extends org.jboss.system.ServiceMBeanSupport

implements AbstractInstancePoolMBean, InstancePool, XmlLoadable

Abstract Instance Pool class containing the basic logic to create an EJB Instance Pool.

Version:

$Revision: 1.28.2.15 $

Author:

Rickard 锟絙erg, Marc Fleury, Andreas Schaefer, Sacha Labourey, Scott Stark/a>

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Field Summary
protected  Container	container           The Container the instance pool is associated with
protected  int	currentIndex
protected  int	maxSize           The maximum number of instances allowed in the pool
protected  int	minSize           The minimum size of the pool
protected  boolean	minSizeInitialized
protected  int	overMax
protected  int	overMin
protected  EnterpriseContext[]	pool           The pool data structure
protected  boolean	reclaim           determine if we reuse EnterpriseContext objects i.e.

 

Fields inherited from class org.jboss.system.ServiceMBeanSupport

log, server, SERVICE_CONTROLLER_SIG, serviceName

 

Fields inherited from interface org.jboss.system.ServiceMBean

CREATE_EVENT, CREATED, DESTROY_EVENT, DESTROYED, FAILED, REGISTERED, START_EVENT, STARTED, STARTING, states, STOP_EVENT, STOPPED, STOPPING, UNREGISTERED

 

Constructor Summary

AbstractInstancePool()

 

Method Summary
protected abstract  EnterpriseContext	create(Object instance)
protected  void	destroyService()
void	discard(EnterpriseContext ctx)           Discard an anonymous instance after invocation.
void	free(EnterpriseContext ctx)           Return an instance after invocation.
EnterpriseContext	get()           Get an instance without identity.
Container	getContainer()
int	getCurrentSize()           Return the size of the pool.
int	getMaximumSize()
int	getMaxSize()           Get the maximum size of the pool.
int	getMinimumSize()
boolean	getStrictMaximumSize()
long	getStrictTimeout()
void	importXml(Element element)           XmlLoadable implementation
void	setContainer(Container c)           Set the callback to the container.

 

Methods inherited from class org.jboss.system.ServiceMBeanSupport

create, createService, destroy, getLog, getName, getNextNotificationSequenceNumber, getObjectName, getServer, getServiceName, getState, getStateString, jbossInternalCreate, jbossInternalDescription, jbossInternalDestroy, jbossInternalLifecycle, jbossInternalStart, jbossInternalStop, postDeregister, postRegister, preDeregister, preRegister, start, startService, stop, stopService

 

Methods inherited from class org.jboss.mx.util.JBossNotificationBroadcasterSupport

addNotificationListener, getNotificationInfo, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.jboss.system.ServiceMBean

getName, getState, getStateString, jbossInternalLifecycle

 

Methods inherited from interface org.jboss.system.Service

create, destroy, start, stop

 

Field Detail

container

protected Container container

The Container the instance pool is associated with

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pool

protected EnterpriseContext[] pool

The pool data structure

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currentIndex

protected int currentIndex

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maxSize

protected int maxSize

The maximum number of instances allowed in the pool

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minSize

protected int minSize

The minimum size of the pool

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reclaim

protected boolean reclaim

determine if we reuse EnterpriseContext objects i.e. if we actually do pooling

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overMin

protected volatile int overMin

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overMax

protected volatile int overMax

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minSizeInitialized

protected boolean minSizeInitialized

Constructor Detail

AbstractInstancePool

public AbstractInstancePool()

Method Detail

setContainer

public void setContainer(Container c)

Set the callback to the container. This is for initialization. The IM may extract the configuration from the container.

Specified by:

setContainer in interface ContainerPlugin

Parameters:

c -

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getContainer

public Container getContainer()

Returns:

Callback to the container which can be null if not set proviously

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getCurrentSize

public int getCurrentSize()

Description copied from interface: InstancePool

Return the size of the pool.

Specified by:

getCurrentSize in interface AbstractInstancePoolMBean

Returns:

the current pool size

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getMaxSize

public int getMaxSize()

Description copied from interface: InstancePool

Get the maximum size of the pool.

Specified by:

getMaxSize in interface AbstractInstancePoolMBean

Returns:

the current pool size

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get

public EnterpriseContext get()
                      throws Exception

Get an instance without identity. Can be used by finders,create-methods, and activation

Specified by:

get in interface InstancePool

Returns:

Context /w instance

Throws:

RemoteException

Exception - RemoteException

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free

public void free(EnterpriseContext ctx)

Return an instance after invocation. Called in 2 cases: a) Done with finder method b) Just removed

Specified by:

free in interface InstancePool

Parameters:

ctx -

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discard

public void discard(EnterpriseContext ctx)

Description copied from interface: InstancePool

Discard an anonymous instance after invocation. This is called if the instance should not be reused, perhaps due to some exception being thrown from it.

Specified by:

discard in interface InstancePool

Parameters:

ctx - The context to discard.

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getMaximumSize

public int getMaximumSize()

Specified by:

getMaximumSize in interface AbstractInstancePoolMBean

Returns:

the maximum size.

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getMinimumSize

public int getMinimumSize()

Specified by:

getMinimumSize in interface AbstractInstancePoolMBean

Returns:

the minimum size.

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getStrictMaximumSize

public boolean getStrictMaximumSize()

Specified by:

getStrictMaximumSize in interface AbstractInstancePoolMBean

Returns:

whether string pooling.

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getStrictTimeout

public long getStrictTimeout()

Specified by:

getStrictTimeout in interface AbstractInstancePoolMBean

Returns:

the strict timeout.

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importXml

public void importXml(Element element)
               throws org.jboss.deployment.DeploymentException

XmlLoadable implementation

Specified by:

importXml in interface XmlLoadable

Throws:

org.jboss.deployment.DeploymentException

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create

protected abstract EnterpriseContext create(Object instance)
                                     throws Exception

Throws:

Exception

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destroyService

protected void destroyService()
                       throws Exception

Throws:

Exception

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