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com.tangosol.net.proxy
Class DefaultProxyServiceLoadBalancer

java.lang.Object
com.tangosol.util.Base
com.tangosol.net.proxy.AbstractProxyServiceLoadBalancer
com.tangosol.net.proxy.DefaultProxyServiceLoadBalancer

All Implemented Interfaces:

ProxyServiceLoadBalancer

public class DefaultProxyServiceLoadBalancer

extends AbstractProxyServiceLoadBalancer

Default ProxyServiceLoadBalancer implementation.

This implementation will redirect a new client connection to another ProxyService Member if a less utilized Member is identified. A Member is considered less utilized than another iff it's associated ProxyServiceLoad object is less than the ProxyServiceLoad of the other Member according to the Comparator specified during construction. By default, the natural ordering of the ProxyServiceLoad objects is used.

Author:

jh 2010.12.10

Field Summary

protected ProxyServiceLoad	m_loadLocal The ProxyServiceLoad associated with the "local" Member.
protected java.util.Map	m_mapLoad A Map of ProxyServiceLoad objects keyed by their associated Member.
protected java.util.SortedMap	m_mapMember A SortedMap of Member objects keyed by their associated ProxyServiceLoad.

Fields inherited from class com.tangosol.net.proxy.AbstractProxyServiceLoadBalancer

m_service

Constructor Summary

DefaultProxyServiceLoadBalancer()
Default constructor.

DefaultProxyServiceLoadBalancer(java.util.Comparator comparator)
Create a new DefaultProxyServiceLoadBalancer that will order ProxyServiceLoad objects using the specified Comparator.

Method Summary

java.util.List	getMemberList(Member client) Called by the ProxyService when a new client connects to obtain an ordered list of Members to which the new client should be redirected.
void	update(Member member, ProxyServiceLoad load) Update the load balancing strategy in response to a change in a ProxyService utilization.

Methods inherited from class com.tangosol.net.proxy.AbstractProxyServiceLoadBalancer

getLocalMember, getService, init, isLocalMember

Field Detail

m_loadLocal

protected ProxyServiceLoad m_loadLocal

The ProxyServiceLoad associated with the "local" Member.

m_mapLoad

protected final java.util.Map m_mapLoad

A Map of ProxyServiceLoad objects keyed by their associated Member.

m_mapMember

protected final java.util.SortedMap m_mapMember

A SortedMap of Member objects keyed by their associated ProxyServiceLoad.

Constructor Detail

DefaultProxyServiceLoadBalancer

public DefaultProxyServiceLoadBalancer()

Default constructor.

DefaultProxyServiceLoadBalancer

public DefaultProxyServiceLoadBalancer(java.util.Comparator comparator)

Create a new DefaultProxyServiceLoadBalancer that will order ProxyServiceLoad objects using the specified Comparator. If null, the natural ordering of the ProxyServiceLoad objects will be used.

Parameters:

comparator - the Comparator used to order ProxyServiceLoad objects

Method Detail

update

public void update(Member member,
                   ProxyServiceLoad load)

Update the load balancing strategy in response to a change in a ProxyService utilization.

Parameters:

member - the Member for which the utilization changed

load - the updated ProxyServiceLoad; if null, the utilization for the specified Member is unknown (e.g. when the ProxyService on the specified Member leaves the cluster)

getMemberList

public java.util.List getMemberList(Member client)

Called by the ProxyService when a new client connects to obtain an ordered list of Members to which the new client should be redirected. If the returned list is null, empty, or contains a single Member that is the "local" Member, the client will remain connected to the calling ProxyService.

Parameters:

client - the Member object that represents the remote client

Returns:

the ordered list of Member objects to which the client should be redirected

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