org.jboss.modcluster.load.impl

Class DynamicLoadBalanceFactorProvider

java.lang.Object

org.jboss.modcluster.load.impl.DynamicLoadBalanceFactorProvider

All Implemented Interfaces:

DynamicLoadBalanceFactorProviderMBean, LoadBalanceFactorProvider

public class DynamicLoadBalanceFactorProvider
extends Object
implements LoadBalanceFactorProvider, DynamicLoadBalanceFactorProviderMBean

LoadBalanceFactorProvider implementation that periodically aggregates load from a set of LoadMetrics.

Author:

Paul Ferraro, Radoslav Husar

Field Summary

Fields

Modifier and Type	Field and Description
static float	DEFAULT_DECAY_FACTOR
static int	DEFAULT_HISTORY
static int	DEFAULT_INITIAL_LOAD

Constructor Summary

Constructors

Constructor and Description
DynamicLoadBalanceFactorProvider(Set<LoadMetric> metrics)
DynamicLoadBalanceFactorProvider(Set<LoadMetric> metrics, int initialLoad)

Method Summary

Modifier and Type	Method and Description
float	getDecayFactor() Returns the exponential decay factor.
int	getHistory() Returns the history count.
int	getLoadBalanceFactor(Engine engine)
Map<String,Double>	getMetrics() Returns the load metrics registered with this provider
void	setDecayFactor(float decayFactor) Sets the exponential decay factor to be applied to historical load values.
void	setHistory(int history) Sets the number of historical load values to consider when calculating the load balance factor.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_INITIAL_LOAD

public static final int DEFAULT_INITIAL_LOAD

See Also:

Constant Field Values

DEFAULT_DECAY_FACTOR

public static final float DEFAULT_DECAY_FACTOR

See Also:

Constant Field Values

DEFAULT_HISTORY

public static final int DEFAULT_HISTORY

See Also:

Constant Field Values

Constructor Detail

DynamicLoadBalanceFactorProvider

public DynamicLoadBalanceFactorProvider(Set<LoadMetric> metrics)

DynamicLoadBalanceFactorProvider

public DynamicLoadBalanceFactorProvider(Set<LoadMetric> metrics,
                                        int initialLoad)

Method Detail

getMetrics

public Map<String,Double> getMetrics()

Description copied from interface: DynamicLoadBalanceFactorProviderMBean

Returns the load metrics registered with this provider

Specified by:

getMetrics in interface DynamicLoadBalanceFactorProviderMBean

Returns:

a collection of load metrics

getLoadBalanceFactor

public int getLoadBalanceFactor(Engine engine)

Specified by:

getLoadBalanceFactor in interface LoadBalanceFactorProvider

getDecayFactor

public float getDecayFactor()

Description copied from interface: DynamicLoadBalanceFactorProviderMBean

Returns the exponential decay factor.

Specified by:

getDecayFactor in interface DynamicLoadBalanceFactorProviderMBean

Returns:

a positive integer

setDecayFactor

public void setDecayFactor(float decayFactor)

Description copied from interface: DynamicLoadBalanceFactorProviderMBean

Sets the exponential decay factor to be applied to historical load values.

Specified by:

setDecayFactor in interface DynamicLoadBalanceFactorProviderMBean

Parameters:

decayFactor - the new decay factor

getHistory

public int getHistory()

Description copied from interface: DynamicLoadBalanceFactorProviderMBean

Returns the history count.

Specified by:

getHistory in interface DynamicLoadBalanceFactorProviderMBean

Returns:

a positive integer

setHistory

public void setHistory(int history)

Description copied from interface: DynamicLoadBalanceFactorProviderMBean

Sets the number of historical load values to consider when calculating the load balance factor.

Specified by:

setHistory in interface DynamicLoadBalanceFactorProviderMBean