[GitHub] [arrow] jduo commented on a change in pull request #8476: ARROW-10106: [FlightRPC][Java] Expose onIsReady() callback

[GitBox <gi...@apache.org>]

jduo commented on a change in pull request #8476:
URL: https://github.com/apache/arrow/pull/8476#discussion_r506961358



##########
File path: java/flight/flight-core/src/main/java/org/apache/arrow/flight/FlightService.java
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@@ -88,12 +87,15 @@ public void listFlights(Flight.Criteria criteria, StreamObserver<Flight.FlightIn
   public void doGetCustom(Flight.Ticket ticket, StreamObserver<ArrowMessage> responseObserverSimple) {
     final ServerCallStreamObserver<ArrowMessage> responseObserver =
         (ServerCallStreamObserver<ArrowMessage>) responseObserverSimple;
+
     final GetListener listener = new GetListener(responseObserver, this::handleExceptionWithMiddleware);
-    try {
-      producer.getStream(makeContext(responseObserver), new Ticket(ticket), listener);
-    } catch (Exception ex) {
-      listener.error(ex);
-    }
+    executors.submit(() -> {

Review comment:
       Do you mean within GetListener? We register #onReady() on the responseObserver during GetListener's constructor, which will delegate to the onReadyHandler if it's been set.




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