amaliujia commented on a change in pull request #14480:
URL: https://github.com/apache/beam/pull/14480#discussion_r612806588
##########
File path:
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/data/QueueingBeamFnDataClient.java
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@@ -193,16 +287,24 @@ public void accept(T value) throws Exception {
}
}
- static class ConsumerAndData<T> {
- private final FnDataReceiver<T> consumer;
- private final T data;
+ private static class ConsumerAndData<T> {
+ private final @Nullable FnDataReceiver<T> consumer;
+ private final @Nullable T data;
+
+ public ConsumerAndData() {
+ this.consumer = null;
+ this.data = null;
+ }
public ConsumerAndData(FnDataReceiver<T> receiver, T data) {
this.consumer = receiver;
this.data = data;
}
void accept() throws Exception {
+ if (consumer == null || data == null) {
+ throw new IllegalStateException("cannot accept POISON");
Review comment:
As this is dealing with a special case, can you leave some comments to
explain when this could happen? (e.g. consumer or data is null then it must be
POSION)
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