Proposal: Fully Concurrent ClassLoading (original) (raw)

David M. Lloyd david.lloyd at redhat.com
Tue Dec 11 15🔞20 UTC 2012


On 12/11/2012 02:12 AM, Peter Levart wrote:

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; }

Sure, but having this map puts me back in the same situation I was in before where we have another concurrent map with a key per class.

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