org.apache.jackrabbit.spi.commons.name

Class HashCache<T>

java.lang.Object

org.apache.jackrabbit.spi.commons.name.HashCache<T>

public class HashCache<T>
extends java.lang.Object

Simple utility class that implements a fixed-size and thread-safe (non-blocking) cache of objects. The cache is simply an array of objects, indexed by their hash codes. If more than one objects hash to the same location, only the most recently accessed object is kept in the cache.

See Also:

https://issues.apache.org/jira/browse/JCR-1663

Constructor Summary

Constructors

Constructor and Description
HashCache() Creates a hash cache with 1024 slots.
HashCache(int exponent) Creates a hash cache with 2^exponent slots.

Method Summary

Modifier and Type	Method and Description
T	get(T object) If a cached copy of the given object already exists, then returns that copy.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashCache

public HashCache()

Creates a hash cache with 1024 slots.

HashCache

public HashCache(int exponent)

Creates a hash cache with 2^exponent slots.

Parameters:

exponent - the exponent.

Method Detail

get

public T get(T object)

If a cached copy of the given object already exists, then returns that copy. Otherwise the given object is cached and returned.

Parameters:

object - object to return from the cache

Returns:

the given object or a previously cached copy