com.sun.enterprise.resource.pool.resizer

Class Resizer

java.lang.Object

java.util.TimerTask

com.sun.enterprise.resource.pool.resizer.Resizer

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

AssocWithThreadPoolResizer

public class Resizer
extends TimerTask

Resizer to remove unusable connections, maintain steady-pool
Remove all invalid and idle resources, as a result one of the following may happen

1. equivalent to "pool-resize" quantity of resources are removed
2. less than "pool-reize" quantity of resources are removed remove more resources to match pool-resize quantity, atmost scale-down till steady-pool-size
3. more than "pool-resize" quantity of resources are removed
   1. if pool-size is less than steady-pool-size, bring it back to steady-pool-size.
      
   2. if pool-size is greater than steady-pool-size, don't do anything.
      

Author:

Jagadish Ramu

Field Summary

Fields

Modifier and Type	Field and Description
protected static Logger	_logger
protected DataStructure	dataStructure
protected ResourceHandler	handler
protected PoolProperties	pool
protected PoolInfo	poolInfo
protected boolean	preferValidateOverRecreate

Constructor Summary

Constructors

Constructor and Description
Resizer(PoolInfo poolInfo, DataStructure dataStructure, PoolProperties pp, ResourceHandler handler, boolean preferValidateOverRecreate)

Method Summary

Modifier and Type	Method and Description
protected static void	debug(String debugStatement)
protected boolean	isResourceEligibleForRemoval(ResourceHandle h, int validConnectionsCounter)
protected int	removeIdleAndInvalidResources() Get the free connections list from the pool, remove idle-timed-out resources and then invalid resources.
void	resizePool(boolean forced) Resize the pool
void	run()
protected void	scaleDownPool(int scaleDownQuantity, boolean forced) Scale down pool by a size <= pool-resize-quantity
protected int	validateAndRemoveResource(ResourceHandle handle, Set invalidConnections)

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Field Detail

poolInfo

protected PoolInfo poolInfo

dataStructure

protected DataStructure dataStructure

pool

protected PoolProperties pool

handler

protected ResourceHandler handler

preferValidateOverRecreate

protected boolean preferValidateOverRecreate

_logger

protected static final Logger _logger

Constructor Detail

Resizer

public Resizer(PoolInfo poolInfo,
               DataStructure dataStructure,
               PoolProperties pp,
               ResourceHandler handler,
               boolean preferValidateOverRecreate)

Method Detail

run

public void run()

Specified by:

run in interface Runnable

Specified by:

run in class TimerTask

resizePool

public void resizePool(boolean forced)

Resize the pool

Parameters:

forced - when force is true, scale down the pool.

scaleDownPool

protected void scaleDownPool(int scaleDownQuantity,
                             boolean forced)

Scale down pool by a size <= pool-resize-quantity

Parameters:

forced - scale-down only when forced

scaleDownQuantity - no. of resources to remove

removeIdleAndInvalidResources

protected int removeIdleAndInvalidResources()

Get the free connections list from the pool, remove idle-timed-out resources and then invalid resources.

Returns:

int number of resources removed

debug

protected static void debug(String debugStatement)

validateAndRemoveResource

protected int validateAndRemoveResource(ResourceHandle handle,
                                        Set invalidConnections)

isResourceEligibleForRemoval

protected boolean isResourceEligibleForRemoval(ResourceHandle h,
                                               int validConnectionsCounter)