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Don't allow activities if the subscriber is current, or the connection to Kinesis is broken #374

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merged 3 commits into from
Aug 20, 2018
Merged

Don't allow activities if the subscriber is current, or the connection to Kinesis is broken #374

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d4cb00d
Added missing lock around the call to request.
pfifer Aug 20, 2018
d8e2f8c
Reject operations where the subscriber doesn't match.
pfifer Aug 20, 2018
393eb4a
Remove unneeded if statement
pfifer Aug 20, 2018
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36 changes: 31 additions & 5 deletions ...client/src/main/java/software/amazon/kinesis/retrieval/fanout/FanOutRecordsPublisher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -305,18 +305,44 @@ public void subscribe(Subscriber<? super ProcessRecordsInput> s) {
subscriber.onSubscribe(new Subscription() {
@Override
public void request(long n) {
long previous = outstandingRequests;
outstandingRequests += n;
if (previous <= 0) {
flow.request(1);
synchronized (lockObject) {
if (subscriber != s) {
log.warn(
"{}: (FanOutRecordsPublisher/Subscription#request) - Rejected an attempt to request({}), because subscribers don't match.",
shardId, n);
return;
}
if (flow == null) {
//
// Flow has been terminated, so we can't make any requests on it anymore.
//
log.debug(
"{}: (FanOutRecordsPublisher/Subscription#request) - Request called for a null flow.",
shardId);
errorOccurred(flow, new IllegalStateException("Attempted to request on a null flow."));
return;
}
long previous = outstandingRequests;
outstandingRequests += n;
if (previous <= 0) {
flow.request(1);
}
}
}

@Override
public void cancel() {
synchronized (lockObject) {
if (subscriber != s) {
log.warn(
"{}: (FanOutRecordsPublisher/Subscription#cancel) - Rejected attempt to cancel subscription, because subscribers don't match.",
shardId);
return;
}
if (!hasValidSubscriber()) {
log.warn("{}: Cancelled called even with an invalid subscriber", shardId);
log.warn(
"{}: (FanOutRecordsPublisher/Subscription#cancel) - Cancelled called even with an invalid subscriber",
shardId);
}
subscriber = null;
if (flow != null) {
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