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Minor, added some methods to ReadDemand that would increase readability #17793

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Minor, added some methods to ReadDemand that would increase readability #17793

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c51c116
Minor, added some methods to ReadDemand that would increase readability
andsel Jul 10, 2025
bc6339b
Switched isSatisfiable to the more meaningful isDeferrable
andsel Jul 11, 2025
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20 changes: 16 additions & 4 deletions logstash-core/src/main/java/org/logstash/ackedqueue/Queue.java
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Original file line number Diff line number Diff line change
Expand Up @@ -932,10 +932,9 @@ private Batch deserialize() {
private boolean awaitReadDemand(final long timeoutMillis, final int elementsNeeded) throws InterruptedException {
assert this.lock.isHeldByCurrentThread();

final long deadlineMillis = Math.addExact(System.currentTimeMillis(), timeoutMillis);
this.readDemand = new ReadDemand(deadlineMillis, elementsNeeded);
this.readDemand = ReadDemand.fromExpectedTimeout(timeoutMillis, elementsNeeded);

boolean unElapsed = this.notEmpty.awaitUntil(new Date(deadlineMillis));
boolean unElapsed = this.notEmpty.awaitUntil(this.readDemand.expectedExpiry());
this.readDemand = null;
return unElapsed;
}
Expand All @@ -946,7 +945,7 @@ private void maybeSignalReadDemand(boolean forceSignal) {
// if we're not forcing, and if the current read demand has
// neither been met nor expired, this method becomes a no-op.
if (!forceSignal && Objects.nonNull(readDemand)) {
if (unreadCount < readDemand.elementsNeeded && System.currentTimeMillis() < readDemand.deadlineMillis) {
if (!readDemand.isSatisfiable(unreadCount)) {
return;
}
}
Expand All @@ -962,5 +961,18 @@ private static class ReadDemand {
this.deadlineMillis = deadlineMillis;
this.elementsNeeded = elementsNeeded;
}

boolean isSatisfiable(long available) {
return available >= elementsNeeded || System.currentTimeMillis() >= deadlineMillis;
}

static ReadDemand fromExpectedTimeout(long timeoutMillis, int elementsNeeded) {
final long deadlineMillis = Math.addExact(System.currentTimeMillis(), timeoutMillis);
return new ReadDemand(deadlineMillis, elementsNeeded);
}

public Date expectedExpiry() {
return new Date(deadlineMillis);
}
}
}