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:

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

Direct Known Subclasses:

EntityInstancePool, MessageDrivenInstancePool, SingletonStatelessSessionInstancePool, StatefulSessionInstancePool, StatelessSessionInstancePool

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: 57209 $

Author:

Rickard Oberg, Marc Fleury, Andreas Schaefer, Sacha Labourey, Scott Stark/a>, Dimitris Andreadis

Field Summary

protected Container	container The Container the instance pool is associated with
protected int	maxSize The maximum number of instances allowed in the pool
protected LinkedList	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

Fields inherited from interface org.jboss.ejb.AllowedOperationsFlags

IN_AFTER_BEGIN, IN_AFTER_COMPLETION, IN_BEFORE_COMPLETION, IN_BUSINESS_METHOD, IN_EJB_ACTIVATE, IN_EJB_CREATE, IN_EJB_FIND, IN_EJB_HOME, IN_EJB_LOAD, IN_EJB_PASSIVATE, IN_EJB_POST_CREATE, IN_EJB_REMOVE, IN_EJB_STORE, IN_EJB_TIMEOUT, IN_INTERCEPTOR_METHOD, IN_SERVICE_ENDPOINT_METHOD, IN_SET_ENTITY_CONTEXT, IN_SET_MESSAGE_DRIVEN_CONTEXT, IN_SET_SESSION_CONTEXT, IN_UNSET_ENTITY_CONTEXT, NOT_ALLOWED

Constructor Summary

AbstractInstancePool()

Method Summary

void	clear() Clear the pool - does not remove inuse contexts
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.
long	getAvailableCount() Get the current avaiable count from the strict max view.
Container	getContainer()
int	getCurrentSize() Return the size of the pool.
int	getMaxSize() Get the maximum size of the pool.
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, getDeploymentInfo, 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, nextNotificationSequenceNumber, 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

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

pool

protected LinkedList pool

The pool data structure

maxSize

protected int maxSize

The maximum number of instances allowed in the pool

reclaim

protected boolean reclaim

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

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 -

getContainer

public Container getContainer()

Returns:

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

getCurrentSize

public int getCurrentSize()

Description copied from interface: InstancePool

Return the size of the pool.

Specified by:

getCurrentSize in interface InstancePool

Specified by:

getCurrentSize in interface AbstractInstancePoolMBean

Returns:

the current pool size

getMaxSize

public int getMaxSize()

Description copied from interface: InstancePool

Get the maximum size of the pool.

Specified by:

getMaxSize in interface InstancePool

Specified by:

getMaxSize in interface AbstractInstancePoolMBean

Returns:

the current pool size

getAvailableCount

public long getAvailableCount()

Get the current avaiable count from the strict max view. If there is no strict max then this will be Long.MAX_VALUE to indicate there is no restriction.

Specified by:

getAvailableCount in interface AbstractInstancePoolMBean

Returns:

the current avaiable count from the strict max view

clear

public void clear()

Description copied from interface: AbstractInstancePoolMBean

Clear the pool - does not remove inuse contexts

Specified by:

clear in interface AbstractInstancePoolMBean

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

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 -

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.

importXml

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

XmlLoadable implementation

Specified by:

importXml in interface XmlLoadable

Throws:

org.jboss.deployment.DeploymentException

create

protected abstract EnterpriseContext create(Object instance)
                                     throws Exception

Throws:

Exception

destroyService

protected void destroyService()
                       throws Exception

Overrides:

destroyService in class org.jboss.system.ServiceMBeanSupport

Throws:

Exception