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UniFailOnTimeout.java
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UniFailOnTimeout.java
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package io.smallrye.mutiny.operators.uni;
import static io.smallrye.mutiny.helpers.EmptyUniSubscription.CANCELLED;
import java.time.Duration;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import io.smallrye.mutiny.Uni;
import io.smallrye.mutiny.helpers.EmptyUniSubscription;
import io.smallrye.mutiny.helpers.ParameterValidation;
import io.smallrye.mutiny.infrastructure.Infrastructure;
import io.smallrye.mutiny.operators.AbstractUni;
import io.smallrye.mutiny.operators.UniOperator;
import io.smallrye.mutiny.subscription.UniSubscriber;
import io.smallrye.mutiny.subscription.UniSubscription;
public class UniFailOnTimeout<I> extends UniOperator<I, I> {
private final Duration timeout;
private final Supplier<? extends Throwable> supplier;
private final ScheduledExecutorService executor;
public UniFailOnTimeout(Uni<I> upstream, Duration timeout, Supplier<? extends Throwable> supplier,
ScheduledExecutorService executor) {
super(upstream);
this.timeout = timeout;
this.supplier = supplier;
this.executor = executor == null ? Infrastructure.getDefaultWorkerPool() : executor;
}
@Override
public void subscribe(UniSubscriber<? super I> subscriber) {
AbstractUni.subscribe(upstream(), new UniFailOnTimeoutProcessor(subscriber));
}
private class UniFailOnTimeoutProcessor extends UniOperatorProcessor<I, I> {
private volatile ScheduledFuture<?> timeoutFuture;
public UniFailOnTimeoutProcessor(UniSubscriber<? super I> downstream) {
super(downstream);
}
@Override
public void onSubscribe(UniSubscription subscription) {
try {
timeoutFuture = executor.schedule(this::doTimeout, timeout.toMillis(), TimeUnit.MILLISECONDS);
} catch (RejectedExecutionException e) {
// Executor out of service.
getAndSetUpstreamSubscription(CANCELLED);
subscription.cancel();
downstream.onSubscribe(EmptyUniSubscription.DONE);
downstream.onFailure(e);
return;
}
super.onSubscribe(subscription);
}
@Override
public void onItem(I item) {
UniSubscription sub = getAndSetUpstreamSubscription(CANCELLED);
if (sub != CANCELLED) {
if (timeoutFuture != null) {
timeoutFuture.cancel(false);
}
downstream.onItem(item);
}
}
@Override
public void onFailure(Throwable failure) {
UniSubscription sub = getAndSetUpstreamSubscription(CANCELLED);
if (sub != CANCELLED) {
if (timeoutFuture != null) {
timeoutFuture.cancel(false);
}
downstream.onFailure(failure);
} else {
Infrastructure.handleDroppedException(failure);
}
}
@Override
public void cancel() {
if (timeoutFuture != null) {
timeoutFuture.cancel(false);
}
super.cancel();
}
private void doTimeout() {
if (isCancelled()) {
return;
}
super.cancel();
Throwable throwable;
try {
throwable = supplier.get();
} catch (Throwable e) {
downstream.onFailure(e);
return;
}
if (throwable == null) {
downstream.onFailure(new NullPointerException(ParameterValidation.SUPPLIER_PRODUCED_NULL));
} else {
downstream.onFailure(throwable);
}
}
}
}