XOM API for Processing XML with Java

[Wolfgang Hoschek <whoschek AT lbl.gov>]

On Dec 10, 2004, at 12:03 PM, Elliotte Harold wrote:

> Wolfgang Hoschek wrote:
>
>
> > Each call to builder.build(...) produces another 5 misses, so it 
> > seems xerces does not keep the URIs interned across builds. But 
> > that's fine and no problem.
>
> If it doesn't keep the URIs interned across builds, then how does that 
> affect multithreaded environments where you could be building from 
> several documents at once?

Because everything in nu.xom.Verifier is static. All threads are 
contending for the same shared lock in the URICache, irrespective of 
whether they work in the same or different documents. If you have 100 
threads, each rapidly executing URICache.contains() millions of times 
you can get a lot of lock contention and serious performance 
degradation.

Wolfgang.