FR: AsyncSession.isClosed()

[vorburger]

Is your feature request related to a problem? Please describe.

IMHO it would be useful for class AsyncSession to have an isClosed() kind of method.

This is because the async session doesn't just get closed by the user when invoking close() but can apparently also get closed by from server when its done ("Live session closed with code: 1000 and reason:").

To avoid the following, it would be useful if an application could check if it's been closed:

[ForkJoinPool.commonPool-worker-2] ERROR dev.enola.common.concurrent.Async - Async error for resource: GoogleLive sendRealtimeInput()
java.util.concurrent.CompletionException: org.java_websocket.exceptions.WebsocketNotConnectedException
        at java.base/java.util.concurrent.CompletableFuture.wrapInCompletionException(CompletableFuture.java:323)
        at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:359)
        at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:364)
        at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1828)
        at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1817)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
Caused by: org.java_websocket.exceptions.WebsocketNotConnectedException
        at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:669)
        at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:645)
        at org.java_websocket.client.WebSocketClient.send(WebSocketClient.java:445)
        at com.google.genai.AsyncSession.lambda$send$0(AsyncSession.java:110)
        at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1825)
        ... 5 more