Proposal: Fully Concurrent ClassLoading (original) (raw)

Peter Levart peter.levart at gmail.com
Tue Dec 11 08:12:24 UTC 2012

On 12/11/2012 04:41 AM, David M. Lloyd wrote:

On JDK 8 with your patches, we are loading around 4750 classes and there are, as expected, 0 define races (I believe, however, that we're getting a false count though whenever defineClass() returns an already-defined class - it would be nice if there were some way to detect that this happened).

Hi David,

You could, of course this would have a minor impact on the whole thing, in your custom ClassLoader, have an instance of:

final ConcurrentMap<Class<?>, Boolean> foundClasses = new ConcurrentHashMap<>();

@Override protected Class<?> findClass(String name) throws ClassNotFoundException { ... ... if (foundClasses.putIfAbsent(clazz, Boolean.TRUE) != null) races++; return clazz; }

Regards, Peter

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