org.apache.hadoop.hbase.io.hfile

Class CacheableDeserializerIdManager

java.lang.Object

org.apache.hadoop.hbase.io.hfile.CacheableDeserializerIdManager

@InterfaceAudience.Private
public class CacheableDeserializerIdManager
extends Object

This class is used to manage the identifiers for CacheableDeserializer. All deserializers are registered with this Manager via the registerDeserializer(CacheableDeserializer)}. On registration, we return an int *identifier* for this deserializer. The int identifier is passed to getDeserializer(int)} to obtain the registered deserializer instance.

Field Summary

Fields

Modifier and Type	Field and Description
private static AtomicInteger	identifier
private static Map<Integer,CacheableDeserializer<Cacheable>>	registeredDeserializers

Constructor Summary

Constructors

Constructor and Description
CacheableDeserializerIdManager()

Method Summary

Modifier and Type	Method and Description
static CacheableDeserializer<Cacheable>	getDeserializer(int id) Get the cacheable deserializer registered at the given identifier Id.
static int	registerDeserializer(CacheableDeserializer<Cacheable> cd) Register the given Cacheable -- usually an hfileblock instance, these implement the Cacheable Interface -- deserializer and generate a unique identifier id for it and return this as our result.
static Map<Integer,String>	save() Snapshot a map of the current identifiers to class names for reconstruction on reading out of a file.

Methods inherited from class java.lang.Object

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

Field Detail

registeredDeserializers

private static final Map<Integer,CacheableDeserializer<Cacheable>> registeredDeserializers

identifier

private static final AtomicInteger identifier

Constructor Detail

CacheableDeserializerIdManager

public CacheableDeserializerIdManager()

Method Detail

registerDeserializer

public static int registerDeserializer(CacheableDeserializer<Cacheable> cd)

Register the given Cacheable -- usually an hfileblock instance, these implement the Cacheable Interface -- deserializer and generate a unique identifier id for it and return this as our result.

Returns:

the identifier of given cacheable deserializer

See Also:

getDeserializer(int)

getDeserializer

public static CacheableDeserializer<Cacheable> getDeserializer(int id)

Get the cacheable deserializer registered at the given identifier Id.

See Also:

registerDeserializer(CacheableDeserializer)

save

public static Map<Integer,String> save()

Snapshot a map of the current identifiers to class names for reconstruction on reading out of a file.