A ClassLoaderExecutor can run any code in any classloader. E.g. assume you have a classloader
called myClassloader and you want to execute a (void) method called myMethod in myObject using this CL:
SingleClassloaderExecutor cle = new SingleClassloaderExecutor(myClassloader);
cle.execute(new Runnable() {
public void run() {
myObject.myMethod();
}
});
What happens is that the entire object graph of myObject is deep-cloned into the
myClassloader
classloader
and then the
myObject.myMethod()
is executed.
You can also execute methods that return something:
SingleClassloaderExecutor cle = new SingleClassloaderExecutor(myClassloader);
MyResult result = cle.execute(new Callable() {
public MyResult call() throws Exception {
return myObject.myMethod();
}
});
Here we imagine that
myObject.myMethod()
returns an object of type
MyResult
. Again the entire
state will be deep-cloned to
myClassloader
and then the
myObject.myMethod()
is executed.
The result of the method call is deep-cloned back into the original classloader (the one that made the call to
cle.execute(..)
) and is ready for use.
Note that the SingleClassloaderExecutor requires a deep cloner implementing the DeepClonerSPI
present in the class-path.