org.apache.hadoop.hive.serde2.avro
Class InstanceCache<SeedObject,Instance>

java.lang.Object
  org.apache.hadoop.hive.serde2.avro.InstanceCache<SeedObject,Instance>

Type Parameters:

SeedObject - Object that determines the instance

Instance - Instance that will be created from SeedObject.

public abstract class InstanceCache<SeedObject,Instance>
extends Object

Cache for objects whose creation only depends on some other set of objects and therefore can be used against other equivalent versions of those objects. Essentially memoizes instance creation.

Constructor Summary

InstanceCache()

Method Summary

protected abstract Instance	makeInstance(SeedObject hv)
Instance	retrieve(SeedObject hv) Retrieve (or create if it doesn't exist) the correct Instance for this SeedObject

Methods inherited from class java.lang.Object

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

Constructor Detail

InstanceCache

public InstanceCache()

Method Detail

retrieve

public Instance retrieve(SeedObject hv)
                  throws AvroSerdeException

Retrieve (or create if it doesn't exist) the correct Instance for this SeedObject

Throws:

AvroSerdeException

makeInstance

protected abstract Instance makeInstance(SeedObject hv)
                                  throws AvroSerdeException

Throws:

AvroSerdeException