Hi Craig,
Another ConcurrentHashMap implementation that is available for JDK 1.4
comes from Emory University's Distributed Computing Lab.
(http://harness2.org/util/backport-util-concurrent/dist/) One of their
goals to make the source easily upgraded to java.util.concurrent once
JDK 1.4 is left behind.
Given the sneakiness of concurrency, I would be very leary of using
anything that hasn't been thoroughly vetted.
I think we can have high confidence in java.util.concurrent as well as
get a good performance boost. Its only downside is that it is not
available for JDK 1.4.
David
Craig L Russell wrote:
Don't know if anyone caught Cliff's preso at Java One...
Anyone want to take a look at the new HashMap?
Craig
Begin forwarded message:
From: Kin-man Chung
Date: May 15, 2007 11:24:38 AM PDT
Subject: Lock-free HashMap
Cliff Click talked about his lock-free HashMap at JavaOne, and
demonstrated its superior scalability over ConcurrentHashMap.
The source is available at
http://sourceforge.net/projects/high-scale-lib
We should check this out and see if it can be used in Glassfish to
boost the spec numbers.
-Kin-man
Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!
