org.jclouds.suppliers
Class SupplyKeyMatchingValueOrNull<K,V>

java.lang.Object
  org.jclouds.suppliers.SupplyKeyMatchingValueOrNull<K,V>

All Implemented Interfaces:

com.google.common.base.Supplier<K>

Direct Known Subclasses:

GetRegionIdMatchingProviderURIOrNull

public class SupplyKeyMatchingValueOrNull<K,V>
extends Object
implements com.google.common.base.Supplier<K>

Allows you to lazy discover a key by value. This is useful for example in service discovery, where you need to see what the "current" service name is based on a map of service names to endpoints.

note

take care to memoize this using Suppliers.memoize(Supplier)

Author:

Adrian Cole

Field Summary

protected Logger

logger

Constructor Summary

SupplyKeyMatchingValueOrNull(com.google.common.base.Supplier<Map<K,com.google.common.base.Supplier<V>>> supplier, com.google.common.base.Supplier<V> valueSupplier)

Method Summary

K

get()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected Logger logger

Constructor Detail

SupplyKeyMatchingValueOrNull

public SupplyKeyMatchingValueOrNull(com.google.common.base.Supplier<Map<K,com.google.common.base.Supplier<V>>> supplier,
                                    com.google.common.base.Supplier<V> valueSupplier)

Method Detail

get

public K get()

Specified by:

get in interface com.google.common.base.Supplier<K>