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TM: downloadDirectory refactor how SDK sends concurrent download file requests #3867

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Merged
zoewangg merged 6 commits into from
Mar 30, 2023
Merged

TM: downloadDirectory refactor how SDK sends concurrent download file requests #3867

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143a2bb
Stop polling from the request queue if there are still requests in fl…
zoewangg Mar 28, 2023
90dcea6
Refactor async buffering subscriber
zoewangg Mar 29, 2023
5ec364c
Address feedback
zoewangg Mar 29, 2023
fbe70b9
Improve existing test
zoewangg Mar 29, 2023
ce32b2a
move request to onNext
zoewangg Mar 30, 2023
29da386
Merge branch 'master' into zoewang/tmFixDownloadDirectory
zoewangg Mar 30, 2023
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25 changes: 14 additions & 11 deletions ...r/src/main/java/software/amazon/awssdk/transfer/s3/internal/AsyncBufferingSubscriber.java
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Original file line number Diff line number Diff line change
Expand Up @@ -64,32 +64,35 @@ public void onSubscribe(Subscription subscription) {
@Override
public void onNext(T item) {
numRequestsInFlight.incrementAndGet();
consumer.apply(item).whenComplete((r, t) -> {
numRequestsInFlight.decrementAndGet();
checkForCompletion();
});
consumer.apply(item)
.whenComplete((r, t) ->
checkForCompletion(numRequestsInFlight.decrementAndGet()));
}

@Override
public void onError(Throwable t) {
upstreamDone = true;
// Need to complete future exceptionally first to prevent
// accidental successful completion by a concurrent checkForCompletion.
returnFuture.completeExceptionally(t);
upstreamDone = true;
}

@Override
public void onComplete() {
upstreamDone = true;
checkForCompletion();
checkForCompletion(numRequestsInFlight.get());
}

private void checkForCompletion() {
if (!upstreamDone) {
subscription.request(1);
private void checkForCompletion(int requestsInFlight) {
if (upstreamDone && requestsInFlight == 0) {
// This could get invoked multiple times, but it doesn't matter
// because future.complete is idempotent.
returnFuture.complete(null);
return;
}

if (upstreamDone && numRequestsInFlight.get() == 0) {
returnFuture.complete(null);
synchronized (this) {
subscription.request(1);
}
}

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