Integrated: 8088420: JavaFX WebView memory leak via EventListener

[Jay Bhaskar]

On Thu, 19 May 2022 13:13:01 GMT, Jay Bhaskar <jbhaskar at openjdk.org> wrote:

> This PR is new implementation of JavaEvent listener memory management.
> Issue  [JDK-8088420](https://bugs.openjdk.java.net/browse/JDK-8088420?filter=-1)
> 
> 1. Calling remove event listener does not free jni global references.
> 2. When WebView goes out of scope (disposed from app) , its Event Listeners are not being garbage collected.
> 
> Solution:
> 1.  Detached the jni global reference from JavaEventListener.
> 2. Create scoped ref counted wrapper class JavaObjectWrapperHandler for jni global reference.
> 3. Create unique  JavaObjectWrapperHandler object for each JavaEventListener.
> 4. EventListenerManager is a singleton class , which stores the JavaObjectWrapperHandler mapped with JavaEventListener.
> 5. EventListenerManager also stores the JavaEventListener mapped with DOMWindow.
> 6. When Event listener explicitly removed , JavaEventListener is being forwarded to EventListenerManager to clear the listener.
> 7. When WebView goes out of scope, EventListenerManager will de-registered all the event listeners based on the ref counts attached with WebView DOMWindow.

This pull request has now been integrated.

Changeset: f5348503
Author:    Jay Bhaskar <jbhaskar at openjdk.org>
Committer: Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.java.net/jfx/commit/f5348503143e8d08f09b4cd48b6a3864bd09c336
Stats:     1509 lines in 11 files changed: 1503 ins; 3 del; 3 mod

8088420: JavaFX WebView memory leak via EventListener

Reviewed-by: kcr, arapte

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PR: https://git.openjdk.java.net/jfx/pull/799