org.apache.curator.x.discovery.strategies

Class StickyStrategy<T>

java.lang.Object

org.apache.curator.x.discovery.strategies.StickyStrategy<T>

All Implemented Interfaces:

ProviderStrategy<T>

public class StickyStrategy<T>
extends Object
implements ProviderStrategy<T>

This strategy uses a master strategy to pick the initial instance. Once picked, that instance is always returned. If, however, the currently selected instance is no longer in the list, the master strategy is used to pick a new instance.

Constructor Summary

Constructors

Constructor and Description
StickyStrategy(ProviderStrategy<T> masterStrategy)

Method Summary

Modifier and Type	Method and Description
ServiceInstance<T>	getInstance(InstanceProvider<T> instanceProvider) Given a source of instances, return one of them for a single use.
int	getInstanceNumber() Each time a new instance is picked, an internal counter is incremented.

Methods inherited from class java.lang.Object

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

Constructor Detail

StickyStrategy

public StickyStrategy(ProviderStrategy<T> masterStrategy)

Parameters:

masterStrategy - the strategy to use for picking the sticky instance

Method Detail

getInstance

public ServiceInstance<T> getInstance(InstanceProvider<T> instanceProvider)
                               throws Exception

Description copied from interface: ProviderStrategy

Given a source of instances, return one of them for a single use.

Specified by:

getInstance in interface ProviderStrategy<T>

Parameters:

instanceProvider - the instance provider

Returns:

the instance to use

Throws:

Exception - any errors

getInstanceNumber

public int getInstanceNumber()

Each time a new instance is picked, an internal counter is incremented. This way you can track when/if the instance changes. The instance can change when the selected instance is not in the current list of instances returned by the instance provider

Returns:

instance number