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From Ralph Goers <>
Subject RE: [Kernel22] How to develop a component?
Date Thu, 08 Apr 2004 21:00:01 GMT

Obviously, if I declared it as NonSwappable hot swapping would not be
allowed - at least for the class (that doesn't mean the rest of the block
couldn't be swapped, but that complicates matters).  

I guess I can envision 3 "types":
NonSwappable - can't ever be hotswapped.
Swappable - should be swapped using ALT3
Nothing declared - should be swapped using ALT2.


-----Original Message-----
From: Stefano Mazzocchi [] 
Sent: Thursday, April 08, 2004 12:45 PM
Subject: Re: [Kernel22] How to develop a component?

Ralph Goers wrote:

> is managing stuff that is supposed to be permanently available.  In this
> case your singleton is no longer a singleton.  Frankly, I'd suggest that
> classes meant to be singletons should implement a Singleton (or
> or whatever) interface to prevent them from ever being reloaded.  By the
> - I think this is a problem for ALL the alternatives, not just this one.
> ALT3 - From a client perspective, this looks just like ALT2. The client
> a lookup that obtains a read lock while release does the unlock.
> Since the Singleton thing makes no sense to me anyway, I'd say use ALT2.

Ralph, what about when you want to hotswap your singleton to a new version?


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