Package org.apache.hadoop.hbase.io.hfile

Class CacheableDeserializerIdManager

java.lang.Object

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

@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	Description
private static final AtomicInteger	identifier
private static final Map<Integer,CacheableDeserializer<Cacheable>>	registeredDeserializers

Constructor Summary

Constructors

Constructor	Description
CacheableDeserializerIdManager()

Method Summary

Modifier and Type	Method	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 Details

registeredDeserializers

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

identifier

private static final AtomicInteger identifier

Constructor Details

CacheableDeserializerIdManager

public CacheableDeserializerIdManager()

Method Details

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.