dpcollins-google commented on a change in pull request #17103:
URL: https://github.com/apache/beam/pull/17103#discussion_r831459291
##########
File path:
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsublite/internal/SubscriptionPartitionLoader.java
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@@ -47,15 +46,99 @@
private final SubscriptionPath subscription;
private final SerializableFunction<TopicPath, Integer> getPartitionCount;
private final Duration pollDuration;
- private final boolean terminate;
+ private final SerializableSupplier<Boolean> terminate;
+
+ private class GeneratorFn extends DoFn<Void, SubscriptionPartition> {
+ @ProcessElement
+ public ProcessContinuation processElement(
+ OutputReceiver<SubscriptionPartition> output,
+ RestrictionTracker<Integer, Integer> restrictionTracker) {
+ int previousCount = restrictionTracker.currentRestriction();
+ int newCount = getPartitionCount.apply(topic);
+ if (newCount <= previousCount) {
+ return ProcessContinuation.resume().withResumeDelay(pollDuration);
+ }
+ if (!restrictionTracker.tryClaim(newCount)) {
+ return ProcessContinuation.stop();
+ }
+ Instant ts = previousCount == 0 ? BoundedWindow.TIMESTAMP_MIN_VALUE :
getWatermark();
+ for (int i = previousCount; i < newCount; ++i) {
+ output.outputWithTimestamp(SubscriptionPartition.of(subscription,
Partition.of(i)), ts);
+ }
+ if (terminate.get()) {
+ return ProcessContinuation.stop();
+ }
+ return ProcessContinuation.resume().withResumeDelay(pollDuration);
+ }
+
+ @GetInitialRestriction
+ public Integer getInitialRestriction() {
+ return 0;
+ }
+
+ @NewTracker
+ public RestrictionTracker<Integer, Integer> newTracker(@Restriction
Integer input) {
Review comment:
Not really, the backlog should always be 0 and the progress always 100%
complete, since adding partitions is a manual operation.
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