So you want to create a classloader local like there is a thread local.
You can subclass ClassLoader and put your field in the newly created class.
Why do you need to put your localMap in java.lang.Classloader ?
Rémi
Le 16/09/2010 14:56, Jevgeni Kabanov a écrit :
Hi guys,
I'd like to contribute two new classes to the JDK7 and add a new
package-visible field to the ClassLoader. These classes would be meant
for the framework and server developers to allow for greater control
over the references between classes in different class loaders.
Specifically the goal would be to prevent the notoriously common
classloader leaks. The motivation is partially described here:
http://dow.ngra.de/2009/06/15/classloaderlocal-how-to-avoid-classloader-leaks-on-application-redeploy/
That blog post also describes a way to backport it to older Java
versions, unfortunately we found that the described approach will not
work in some esoteric cases.
The pseudo-code follows. It's not really optimized or even tested and
is only meant to illustrate the functionality and complexity of the
proposal. I'd like to hear your feedback on this.
class ClassLoader {
Map localMap = new HashMap();
//...
}
public class ClassLoaderLocal {
private Object key = new Object();
public Object get(ClassLoader cl) {
cl.localMap.get(key);
}
public void set(ClassLoader cl, Object value) {
cl.localMap.put(key, value);
}
}
public class ClassLoaderWeakReference extends Reference {
private final WeakReference clRef;
private final ClassLoaderLocal cll = new ClassLoaderLocal();
public ClassLoaderWeakReference(Object target) {
clRef = new WeakReference(target.getClass().getClassLoader());
cll.set(target.getClass().getClassLoader(), target);
}
public Object get() {
if (clRef.get() == null)
return null;
return cll.get((ClassLoader) clRef.get());
}
}
me*Jevgeni Kabanov*: Founder & CTO at ZeroTurnaround
<http:/www.zeroturnaround.com/>
[email protected] <mailto:[email protected]> |
Skype: ekabanov <skype:ekabanov?chat> | http://twitter.com/ekabanov
"jrebel is r0x: http://bit.ly/6fRGji"; - mschambeck
<http://twitter.com/mschambeck>
