m-trieu commented on code in PR #32774:
URL: https://github.com/apache/beam/pull/32774#discussion_r1801600591
##########
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/client/AbstractWindmillStream.java:
##########
@@ -160,80 +179,125 @@ protected boolean isShutdown() {
private StreamObserver<RequestT> requestObserver() {
if (requestObserver == null) {
throw new NullPointerException(
- "requestObserver cannot be null. Missing a call to startStream() to
initialize.");
+ "requestObserver cannot be null. Missing a call to start() to
initialize stream.");
}
return requestObserver;
}
/** Send a request to the server. */
protected final void send(RequestT request) {
- lastSendTimeMs.set(Instant.now().getMillis());
synchronized (this) {
+ if (isShutdown()) {
+ return;
+ }
+
if (streamClosed.get()) {
throw new IllegalStateException("Send called on a client closed
stream.");
}
- requestObserver().onNext(request);
+ try {
+ lastSendTimeMs.set(Instant.now().getMillis());
+ requestObserver.onNext(request);
+ } catch (StreamObserverCancelledException e) {
+ if (isShutdown()) {
+ logger.debug("Stream was closed or shutdown during send.", e);
+ return;
+ }
+
+ requestObserver.onError(e);
+ }
+ }
+ }
+
+ @Override
+ public final void start() {
+ if (!isShutdown.get() && started.compareAndSet(false, true)) {
+ // start() should only be executed once during the lifetime of the
stream for idempotency and
+ // when shutdown() has not been called.
+ startStream();
}
}
/** Starts the underlying stream. */
- protected final void startStream() {
+ private void startStream() {
// Add the stream to the registry after it has been fully constructed.
streamRegistry.add(this);
while (true) {
try {
synchronized (this) {
+ if (isShutdown.get()) {
+ break;
+ }
startTimeMs.set(Instant.now().getMillis());
lastResponseTimeMs.set(0);
streamClosed.set(false);
- // lazily initialize the requestObserver. Gets reset whenever the
stream is reopened.
- requestObserver = requestObserverSupplier.get();
+ requestObserver.reset();
onNewStream();
if (clientClosed.get()) {
halfClose();
}
return;
Review Comment:
we want to ensure we only add the stream once so we do it outside the loop
if it hits the bottom of the method then we exited the loop w/o returning do
to shutdown or error and we remove it there
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