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From Berin Loritsch <>
Subject Re: Why is FlowInterpreter SingleThreaded?
Date Tue, 21 Oct 2003 12:21:16 GMT
Christopher Oliver wrote:

> Again I know nothing about Avalon, but there seems to be some conceptual 
> confusion between "Stateless" and "ThreadSafe". Stateless objects are of 
> course thread-safe but stateful objects may be also. A container that 
> automatically turns a "ThreadSafe" component into a singleton seems 
> broken to me. Rather I would have thought that a container would provide 
> synchronization to such components.
> My $0.02,

Hmm.  The thing is what synchronization would be meaningful?  The only real
way to ensure a singleton and threadsafety for stateful components is to use
a session object for the intermediate state at hand.  That session object
would have to be ensured is the correct session object for the component at
hand.  I have put together a system where I could force that to be done behind
the scenes, but the synchronization aspects of it make the solution unusable.
It was simply too slow and would cause a bottleneck.

Note that in Cocoon 2.2, we will have a new option available to us:  Per Thread
components.  They would be able to keep state within a single thread of


"They that give up essential liberty to obtain a little temporary safety
  deserve neither liberty nor safety."
                 - Benjamin Franklin

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