org.apache.accumulo.core.file.blockfile.cache
Class CachedBlock

java.lang.Object
  org.apache.accumulo.core.file.blockfile.cache.CachedBlock

All Implemented Interfaces:

Comparable<CachedBlock>, HeapSize

public class CachedBlock
extends Object
implements HeapSize, Comparable<CachedBlock>

Represents an entry in the LruBlockCache.

Makes the block memory-aware with HeapSize and Comparable to sort by access time for the LRU. It also takes care of priority by either instantiating as in-memory or handling the transition from single to multiple access.

Field Summary

static long

PER_BLOCK_OVERHEAD

Constructor Summary

CachedBlock(String blockName, byte[] buf, long accessTime)

CachedBlock(String blockName, byte[] buf, long accessTime, boolean inMemory)

Method Summary

void	access(long accessTime) Block has been accessed.
int	compareTo(CachedBlock that)
byte[]	getBuffer()
String	getName()
org.apache.accumulo.core.file.blockfile.cache.CachedBlock.BlockPriority	getPriority()
long	heapSize()

Methods inherited from class java.lang.Object

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

Field Detail

PER_BLOCK_OVERHEAD

public static final long PER_BLOCK_OVERHEAD

Constructor Detail

CachedBlock

public CachedBlock(String blockName,
                   byte[] buf,
                   long accessTime)

CachedBlock

public CachedBlock(String blockName,
                   byte[] buf,
                   long accessTime,
                   boolean inMemory)

Method Detail

access

public void access(long accessTime)

Block has been accessed. Update its local access time.

heapSize

public long heapSize()

Specified by:

heapSize in interface HeapSize

Returns:

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

compareTo

public int compareTo(CachedBlock that)

Specified by:

compareTo in interface Comparable<CachedBlock>

getBuffer

public byte[] getBuffer()

getName

public String getName()

getPriority

public org.apache.accumulo.core.file.blockfile.cache.CachedBlock.BlockPriority getPriority()