org.apache.hadoop.hbase.io.hfile

Class BlockCacheKey

java.lang.Object

org.apache.hadoop.hbase.io.hfile.BlockCacheKey

All Implemented Interfaces:

Serializable, HeapSize

@InterfaceAudience.Private
public class BlockCacheKey
extends Object
implements HeapSize, Serializable

Cache Key for use with implementations of BlockCache

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static long	FIXED_OVERHEAD

Constructor Summary

Constructors

Constructor and Description
BlockCacheKey(String hfileName, long offset) Construct a new BlockCacheKey

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getHfileName()
long	getOffset()
int	hashCode()
long	heapSize() Strings have two bytes per character due to default Java Unicode encoding (hence length times 2).
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

FIXED_OVERHEAD

public static final long FIXED_OVERHEAD

Constructor Detail

BlockCacheKey

public BlockCacheKey(String hfileName,
             long offset)

Construct a new BlockCacheKey

Parameters:

hfileName - The name of the HFile this block belongs to.

offset - Offset of the block into the file

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

heapSize

public long heapSize()

Strings have two bytes per character due to default Java Unicode encoding (hence length times 2).

Specified by:

heapSize in interface HeapSize

Returns:

Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.

getHfileName

public String getHfileName()

Returns:

The hfileName portion of this cache key

getOffset

public long getOffset()