Sorry if this has been discussed before (or if I'm completely wrong on this):
It seems that Component#getSizeInBytes() gives wrong results in case of
non-static nested classes (which is quite common in Wicket):
>public LoginPage() {
> add(new Link("login") {
> public void onClick() {
> ...
> }
> });
>}
Yes, Component#getSizeInBytes() sets the parent reference to null before
calling Objects.sizeof(this).
But the reference to the enclosing object (this$0) will trigger a serialization
of the complete page, thus resulting in a wrong size calculation.
I've experimented a little bit and came up with the following solution that
nullifies any reference to a configurable 'stop' object:
Objects.java:
>public static long sizeof(final Object object, final Object stopObject)
>{
> try
> {
> final ByteCountingOutputStream out = new ByteCountingOutputStream();
> new StoppingObjectObjectStream(out, stopObject).writeObject(object);
> out.close();
> return out.size();
> }
> catch (IOException e)
> {
> e.printStackTrace();
> return -1;
> }
>}
StoppingObjectObjectStream.java:
>public class StoppingObjectObjectStream extends ObjectOutputStream {
> private Object stopObject;
> public StoppingObjectObjectStream(OutputStream out,
> Object stopObject) throws IOException {
> super(out);
>
> this.stopObject = stopObject;
>
> enableReplaceObject(true);
> }
>
> protected Object replaceObject(Object obj) throws IOException {
> if (obj == stopObject) {
> return null;
> }
> return super.replaceObject(obj);
> }
>}
Now there's no need any more to nullify the parent of the component and
resetting it afterwards in Component.java:
>public long getSizeInBytes()
>{
> return Objects.sizeof(this, getParent());
>}
What do you think? Perhaps a little bit freaky I must admit.
Sven
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