org.openspaces.pu.container.jee.lb.apache

Class ApacheLoadBalancerAgent

java.lang.Object

org.openspaces.pu.container.jee.lb.apache.ApacheLoadBalancerAgent

All Implemented Interfaces:

Runnable, EventListener, DiscoveryListener, ServiceDiscoveryListener

public class ApacheLoadBalancerAgent
extends Object
implements DiscoveryListener, ServiceDiscoveryListener, Runnable

Experimental support for automatically refreshing apache load balancer.

Note, internal API here on how to find processing units is subject to change.

Author:

kimchy

Constructor Summary

Constructors

Constructor and Description
ApacheLoadBalancerAgent()

Method Summary

Modifier and Type	Method and Description
void	discarded(DiscoveryEvent event) Called when one or more lookup service registrars has been discarded.
void	discovered(DiscoveryEvent event) Called when one or more lookup service registrars has been discovered.
String	getApachectlLocation()
String	getConfigLocation()
String[]	getGroups()
String	getLocators()
String	getRestartCommand()
int	getUpdateInterval()
static void	main(String[] args)
static void	printUsage()
void	run()
void	serviceAdded(ServiceDiscoveryEvent event) When the cache receives from one of the managed lookup services, an event signaling the registration of a service of interest for the first time (or for the first time since the service has been discarded), the cache invokes the serviceAdded method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that a service of interest has been discovered.
void	serviceChanged(ServiceDiscoveryEvent event) When the cache receives, from a managed lookup service, an event signaling the unique modification of the attributes of a service of interest (across the attribute sets of all references to the service), the cache invokes the serviceChanged method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that the state of a service of interest has changed.
void	serviceRemoved(ServiceDiscoveryEvent event) When the cache receives, from a managed lookup service, an event signaling the removal of a service of interest from the last such lookup service with which it was registered, the cache invokes the serviceRemoved method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that a service of interest has been discarded.
void	setApachectlLocation(String apachectlLocation)
void	setConfigLocation(String configLocation)
void	setGroups(String[] groups)
void	setLocators(String locators)
void	setRestartCommand(String restartCommand)
void	setUpdateInterval(int updateInterval)
void	start()
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

ApacheLoadBalancerAgent

public ApacheLoadBalancerAgent()

Method Detail

getGroups

public String[] getGroups()

setGroups

public void setGroups(String[] groups)

getLocators

public String getLocators()

setLocators

public void setLocators(String locators)

getApachectlLocation

public String getApachectlLocation()

setApachectlLocation

public void setApachectlLocation(String apachectlLocation)

getConfigLocation

public String getConfigLocation()

setConfigLocation

public void setConfigLocation(String configLocation)

getUpdateInterval

public int getUpdateInterval()

setUpdateInterval

public void setUpdateInterval(int updateInterval)

getRestartCommand

public String getRestartCommand()

setRestartCommand

public void setRestartCommand(String restartCommand)

start

public void start()
           throws Exception

Throws:

Exception

stop

public void stop()

discovered

public void discovered(DiscoveryEvent event)

Description copied from interface: DiscoveryListener

Called when one or more lookup service registrars has been discovered. The method should return quickly; e.g., it should not make remote calls.

Specified by:

discovered in interface DiscoveryListener

Parameters:

event - the event that describes the discovered registrars

discarded

public void discarded(DiscoveryEvent event)

Description copied from interface: DiscoveryListener

Called when one or more lookup service registrars has been discarded. The method should return quickly; e.g., it should not make remote calls.

Specified by:

discarded in interface DiscoveryListener

Parameters:

event - the event that describes the discarded registrars

serviceAdded

public void serviceAdded(ServiceDiscoveryEvent event)

Description copied from interface: ServiceDiscoveryListener

When the cache receives from one of the managed lookup services, an event signaling the registration of a service of interest for the first time (or for the first time since the service has been discarded), the cache invokes the serviceAdded method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that a service of interest has been discovered.

Specified by:

serviceAdded in interface ServiceDiscoveryListener

Parameters:

event - an instance of ServiceDiscoveryEvent containing references to the service item corresponding to the event, including representations of the service's state both before and after the event.

serviceRemoved

public void serviceRemoved(ServiceDiscoveryEvent event)

Description copied from interface: ServiceDiscoveryListener

When the cache receives, from a managed lookup service, an event signaling the removal of a service of interest from the last such lookup service with which it was registered, the cache invokes the serviceRemoved method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that a service of interest has been discarded.

Specified by:

serviceRemoved in interface ServiceDiscoveryListener

Parameters:

event - a ServiceDiscoveryEvent object containing references to the service item corresponding to the event, including representations of the service's state both before and after the event.

serviceChanged

public void serviceChanged(ServiceDiscoveryEvent event)

Description copied from interface: ServiceDiscoveryListener

When the cache receives, from a managed lookup service, an event signaling the unique modification of the attributes of a service of interest (across the attribute sets of all references to the service), the cache invokes the serviceChanged method on all instances of ServiceDiscoveryListener that are registered with the cache; doing so notifies the entity that the state of a service of interest has changed.

Specified by:

serviceChanged in interface ServiceDiscoveryListener

Parameters:

event - a ServiceDiscoveryEvent object containing references to the service item corresponding to the event, including representations of the service's state both before and after the event.

run

public void run()

Specified by:

run in interface Runnable

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

printUsage

public static void printUsage()