org.mapdb

Class Store.Cache.HashTable

java.lang.Object

org.mapdb.Store.Cache

org.mapdb.Store.Cache.HashTable

Enclosing class:

Store.Cache

public static final class Store.Cache.HashTable
extends Store.Cache

Fixed size cache which uses hash table. Is thread-safe and requires only minimal locking. Items are randomly removed and replaced by hash collisions.

This is simple, concurrent, small-overhead, random cache.

Author:

Jan Kotek

Nested Class Summary

Nested classes/interfaces inherited from class org.mapdb.Store.Cache

Store.Cache.HardRef, Store.Cache.HashTable, Store.Cache.LRU, Store.Cache.WeakSoftRef

Field Summary

Fields

Modifier and Type	Field and Description
protected int	cacheMaxSizeMask
protected Object[]	items
protected long[]	recids

Fields inherited from class org.mapdb.Store.Cache

cacheHitCounter, cacheMissCounter, lock, NULL

Constructor Summary

Constructors

Constructor and Description
Store.Cache.HashTable(int cacheMaxSize, boolean disableLocks)

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
void	close()
Object	get(long recid)
Store.Cache	newCacheForOtherSegment()
protected int	pos(long recid)
void	put(long recid, Object item)

Methods inherited from class org.mapdb.Store.Cache

metricsCacheHit, metricsCacheMiss

Methods inherited from class java.lang.Object

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

Field Detail

recids

protected final long[] recids

items

protected final Object[] items

cacheMaxSizeMask

protected final int cacheMaxSizeMask

Constructor Detail

Store.Cache.HashTable

public Store.Cache.HashTable(int cacheMaxSize,
                     boolean disableLocks)

Method Detail

get

public Object get(long recid)

Specified by:

get in class Store.Cache

put

public void put(long recid,
       Object item)

Specified by:

put in class Store.Cache

pos

protected int pos(long recid)

clear

public void clear()

Specified by:

clear in class Store.Cache

close

public void close()

Specified by:

close in class Store.Cache

newCacheForOtherSegment

public Store.Cache newCacheForOtherSegment()

Specified by:

newCacheForOtherSegment in class Store.Cache