Andrea Aime a écrit :
> I'm wondering if all the synchronized keywords around the
> getXXXFactory methods of CommonFactoryFinder are really needed.
> Wouldn't it be sufficient to syncrhonize the creation of the
> the service registry, that is, the getServiceRegistry?
> Scanning the registry takes quite a bit more time that just
> creating it.
The problem is that the scans of the registry can change the registry state as
well. The factory are not loaded at FactoryRegistry creation, but delayed until
a scan is performed for a given category. The state may also change if a
factory
iterator were added or removed since the last scan, etc.
However if we implement the cache you are suggesting, we could look in the
cache
first in a non-synchronized block (maybe using ConcurrentHashMap or some
similar
mechanism), then synchronize only if no suitable factory were found in the
cache.
Martin
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