[jdjlist] RE: Caching

Tue, 04 Mar 2003 13:14:29 -0800

One technique to communicate changes in cache state across multiple JVMs is to use some type of async messaging service (like JMS). You have to preserve transaction semantics when doing this for real. There have been some articles describing this approach within the last year.
 
If you haven't looked at oscache yet, check it out at
 
It is geared towards caching dynamic content in web pages, but it's use need not be restricted to that paradigm.
-----Original Message-----
From: Greg Nudelman [mailto:[EMAIL PROTECTED]
Sent: Tuesday, March 04, 2003 2:54 PM
To: jdjlist
Subject: [jdjlist] RE: Caching

That sounds very interesting.  It actually sounds similar to the sun article I've just come across:
 
 
However, I know there are lots of gotchas and design caveats that are not addressed by this article, including the expired item re-loading from DB and keeping the cache to a certain manageable size.
 
I am especially interested in the distributed cache management scheme you mentioned.  Having duplicate cache contents on all of our production machines is definitely a major problem.  If there is a way to efficiently share memory among the different machines, I am sure many list members will want to know about it.
 
Thanks in advance,
 
Greg
-----Original Message-----
From: James Stauffer [mailto:[EMAIL PROTECTED]
Sent: Tuesday, March 04, 2003 11:48 AM
To: jdjlist
Subject: [jdjlist] RE: Caching

We have our own internally developed object cache. It uses a hard cache (can't be GC'ed) extended by a soft reference cache. It also has a cache manager servlet and another servlet to manage the caches across machines.  It mostly only caches objects of the following:
 
public interface CacheAble {
  public int getID();
 
  public String getClassName();
 
  public String getDescriptor();
}
If you are interested I can probably give more design details.

James Stauffer

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