Proposal: Fully Concurrent ClassLoading

[Peter Levart]

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