net.sf.ehcache.constructs.concurrent
Class ConcurrencyUtil
public final
class
ConcurrencyUtil
extends Object
Various bits of black magic garnered from experts on the concurrency-interest@cs.oswego.edu mailing list.
Version: $Id: ConcurrencyUtil.java 124 2006-06-11 13:44:17Z gregluck $
Author: Greg Luck
Method Summary |
static int | hash(Object object)
Returns a hash code for non-null Object x.
|
static int | selectLock(Object key, int numberOfLocks)
Selects a lock for a key. |
public static int hash(Object object)
Returns a hash code for non-null Object x.
This function ensures that hashCodes that differ only by
constant multiples at each bit position have a bounded
number of collisions. (Doug Lea)
Parameters: object the object serving as a key
Returns: the hash code
public static int selectLock(Object key, int numberOfLocks)
Selects a lock for a key. The same lock is always used for a given key.
Parameters: key
Returns: the selected lock index