org.mapdb

Class Store.Cache

java.lang.Object

org.mapdb.Store.Cache

Direct Known Subclasses:

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

Enclosing class:

Store

public abstract static class Store.Cache
extends Object

Cache implementation, part of Store class.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Store.Cache.HardRef Cache created objects using hard reference.
static class	Store.Cache.HashTable Fixed size cache which uses hash table.
static class	Store.Cache.LRU
static class	Store.Cache.WeakSoftRef Instance cache which uses SoftReference or WeakReference Items can be removed from cache by Garbage Collector if

Field Summary

Fields

Modifier and Type	Field and Description
protected long	cacheHitCounter
protected long	cacheMissCounter
protected Lock	lock
protected static Object	NULL

Constructor Summary

Constructors

Constructor and Description
Store.Cache(boolean disableLocks)

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	clear()
abstract void	close()
abstract Object	get(long recid)
long	metricsCacheHit() how many times was cache hit, also reset counter
long	metricsCacheMiss() how many times was cache miss, also reset counter
abstract Store.Cache	newCacheForOtherSegment()
abstract void	put(long recid, Object item)

Methods inherited from class java.lang.Object

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

Field Detail

lock

protected final Lock lock

cacheHitCounter

protected long cacheHitCounter

cacheMissCounter

protected long cacheMissCounter

NULL

protected static final Object NULL

Constructor Detail

Store.Cache

public Store.Cache(boolean disableLocks)

Method Detail

get

public abstract Object get(long recid)

put

public abstract void put(long recid,
       Object item)

clear

public abstract void clear()

close

public abstract void close()

newCacheForOtherSegment

public abstract Store.Cache newCacheForOtherSegment()

metricsCacheHit

public long metricsCacheHit()

how many times was cache hit, also reset counter

metricsCacheMiss

public long metricsCacheMiss()

how many times was cache miss, also reset counter