Review request for JDK-8035948 - Redesign property listeners for shared classes

Marcus Lagergren marcus.lagergren at
Sun Mar 2 01:39:23 PST 2014

Have you done any benchmarking whether the synchronization in PropertyListeners gives us overhead? Any other numbers we should know about?

On 27 Feb 2014, at 18:22, Hannes Wallnoefer <hannes.wallnoefer at> wrote:

> Please review JDK-8035948 - Redesign property listeners for shared classes:
> This prepares property maps and property listeners to work better with classes that are reused between JS environments. The central ideas are:
> - Reuse property maps between globals in order to minimize polymorphism.
> - Use SoftReferences for property map history to avoid memory leaks
> - Redesign property listeners to be attatched to property maps only since ScriptObjects are specific to one JS environment.
> - Reduce number of property listeners by only creating them when needed (when a callsite accesses an inherited property).
> - Reduce number of prototype history lookups in property maps by using a unique combination of prototype/property maps from the start.
> Actual class sharing functionality is coming in a later webrev. Let me know if you have any questions about this.
> Hannes

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