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
private BlockType	blockType
static long	FIXED_OVERHEAD
private String	hfileName
private boolean	isPrimaryReplicaBlock
private long	offset
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
BlockCacheKey(String hfileName, long offset) Construct a new BlockCacheKey
BlockCacheKey(String hfileName, long offset, boolean isPrimaryReplica, BlockType blockType)

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

hfileName

private final String hfileName

offset

private final long offset

blockType

private final BlockType blockType

isPrimaryReplicaBlock

private final boolean isPrimaryReplicaBlock

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

BlockCacheKey

public BlockCacheKey(String hfileName,
                     long offset,
                     boolean isPrimaryReplica,
                     BlockType blockType)

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

isPrimary

public boolean isPrimary()

getOffset

public long getOffset()

getBlockType

public BlockType getBlockType()