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MultiOnFailureRetryWhenTest.java
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MultiOnFailureRetryWhenTest.java
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package io.smallrye.mutiny.operators;
import static org.assertj.core.api.Assertions.assertThat;
import static org.awaitility.Awaitility.await;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.io.IOException;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import io.smallrye.mutiny.Multi;
import io.smallrye.mutiny.Uni;
import io.smallrye.mutiny.helpers.test.AssertSubscriber;
import io.smallrye.mutiny.operators.multi.MultiRetryWhenOp;
import io.smallrye.mutiny.tuples.Tuple2;
public class MultiOnFailureRetryWhenTest {
private AtomicInteger numberOfSubscriptions;
private Multi<Integer> failingAfter2;
private Multi<Integer> failingAfter1;
@BeforeEach
public void init() {
numberOfSubscriptions = new AtomicInteger();
failingAfter2 = Multi.createFrom()
.<Integer> emitter(emitter -> emitter.emit(1).emit(2).fail(new IOException("boom")))
.onSubscription().invoke(s -> numberOfSubscriptions.incrementAndGet());
failingAfter1 = Multi.createBy().concatenating()
.streams(Multi.createFrom().item(1), Multi.createFrom().failure(new RuntimeException("boom")));
}
@Test
public void testThatUpstreamCannotBeNull() {
assertThrows(IllegalArgumentException.class, () -> new MultiRetryWhenOp<>(null, v -> v));
}
@Test
public void testThatStreamFactoryCannotBeNull() {
assertThrows(IllegalArgumentException.class, () -> Multi.createFrom().nothing().onFailure().retry().when(null));
}
@Test
public void testThatCancellingTheStreamCancelTheProducedWhenStream() {
AtomicInteger cancelled = new AtomicInteger(0);
Multi<Integer> when = Multi.createFrom().range(1, 10)
.onCancellation().invoke(cancelled::incrementAndGet);
AssertSubscriber<Integer> subscriber = failingAfter1
.onFailure().retry().when(x -> when)
.subscribe().withSubscriber(AssertSubscriber.create(3));
subscriber.assertItems(1, 1, 1)
.cancel();
assertThat(cancelled).hasValue(1);
subscriber.cancel();
assertThat(cancelled).hasValue(1);
}
@Test
public void testWithOtherStreamFailing() {
AtomicBoolean subscribed = new AtomicBoolean();
AtomicBoolean cancelled = new AtomicBoolean();
Multi<Integer> multi = failingAfter1
.onSubscription().invoke(sub -> subscribed.set(true))
.onCancellation().invoke(() -> cancelled.set(true));
AssertSubscriber<Integer> subscriber = multi
.onFailure().retry().when(other -> Multi.createFrom().failure(new IllegalStateException("boom")))
.subscribe().withSubscriber(AssertSubscriber.create(10));
subscriber
.assertSubscribed()
.assertFailedWith(IllegalStateException.class, "boom");
assertThat(subscribed.get()).isFalse();
assertThat(cancelled.get()).isFalse();
}
@Test
public void testWhatTheWhenStreamFailsTheUpstreamIsCancelled() {
AtomicBoolean subscribed = new AtomicBoolean();
AtomicBoolean cancelled = new AtomicBoolean();
Multi<Integer> multi = failingAfter1
.onSubscription().invoke(sub -> subscribed.set(true))
.onCancellation().invoke(() -> cancelled.set(true));
AtomicInteger count = new AtomicInteger();
Multi<Integer> retry = multi
.onFailure().retry()
.when(other -> other.flatMap(l -> count.getAndIncrement() == 0 ? Multi.createFrom().item(l)
: Multi.createFrom().failure(new IllegalStateException("boom"))));
AssertSubscriber<Integer> subscriber = retry.subscribe()
.withSubscriber(AssertSubscriber.create(10));
subscriber
.assertSubscribed()
.assertItems(1, 1)
.assertFailedWith(IllegalStateException.class, "boom");
assertThat(subscribed.get()).isTrue();
assertThat(cancelled.get()).isTrue();
}
@Test
public void testCompletionWhenOtherStreamCompletes() {
AtomicBoolean subscribed = new AtomicBoolean();
AtomicBoolean cancelled = new AtomicBoolean();
Multi<Integer> source = failingAfter1
.onSubscription().invoke(sub -> subscribed.set(true))
.onCancellation().invoke(() -> cancelled.set(true));
Multi<Integer> retry = source
.onFailure().retry().when(other -> Multi.createFrom().empty());
AssertSubscriber<Integer> subscriber = retry.subscribe()
.withSubscriber(AssertSubscriber.create(10));
subscriber
.assertSubscribed()
.assertCompleted();
assertThat(subscribed.get()).isFalse();
assertThat(cancelled.get()).isFalse();
}
@Test
public void testAfterOnRetryAndCompletion() {
AtomicBoolean sourceSubscribed = new AtomicBoolean();
Multi<Integer> source = failingAfter1
.onSubscription().invoke(sub -> sourceSubscribed.set(true));
Multi<Integer> retry = source
.onFailure().retry().when(other -> other.select().first());
AssertSubscriber<Integer> subscriber = retry.subscribe()
.withSubscriber(AssertSubscriber.create(10));
subscriber
.assertSubscribed()
.assertItems(1, 1)
.assertCompleted();
assertThat(sourceSubscribed.get()).isTrue();
}
@Test
public void testRepeat() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(11);
failingAfter1
.onFailure().retry().when(v -> Multi.createFrom().range(1, 11))
.subscribe(subscriber);
subscriber
.assertItems(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1)
.assertCompleted();
}
@Test
public void testRepeatWithBackPressure() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(0);
failingAfter2
.onFailure().retry().when(v -> Multi.createFrom().range(1, 6))
.subscribe(subscriber);
subscriber
.assertHasNotReceivedAnyItem()
.assertNotTerminated()
.request(1)
.assertItems(1)
.assertNotTerminated()
.request(2)
.assertItems(1, 2, 1)
.assertNotTerminated()
.request(5)
.assertItems(1, 2, 1, 2, 1, 2, 1, 2)
.assertNotTerminated()
.request(10)
.assertItems(1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2)
.assertCompleted();
}
@Test
public void testWithOtherStreamBeingEmpty() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(0);
failingAfter2
.onFailure().retry().when(v -> Multi.createFrom().empty())
.subscribe(subscriber);
subscriber
.assertHasNotReceivedAnyItem()
.assertCompleted();
}
@Test
public void testWithOtherStreamFailing2() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(0);
failingAfter2
.onFailure().retry().when(v -> Multi.createFrom().failure(new RuntimeException("failed")))
.subscribe(subscriber);
subscriber
.assertHasNotReceivedAnyItem()
.assertFailedWith(RuntimeException.class, "failed");
}
@Test
public void testWithOtherStreamThrowingException() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(10);
failingAfter2
.onFailure().retry().when(v -> {
throw new RuntimeException("failed");
})
.subscribe(subscriber);
subscriber
.assertHasNotReceivedAnyItem()
.assertFailedWith(RuntimeException.class, "failed");
}
@Test
public void testWithOtherStreamReturningNull() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(10);
failingAfter2
.onFailure().retry().when(v -> null)
.subscribe(subscriber);
subscriber
.assertHasNotReceivedAnyItem()
.assertFailedWith(NullPointerException.class, "");
}
@Test
public void testWithOtherStreamFailingAfterAFewItems() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(10);
failingAfter2.onFailure().retry().when(v -> v.map(a -> {
throw new RuntimeException("failed");
}))
.subscribe(subscriber);
subscriber.assertItems(1, 2)
.assertFailedWith(RuntimeException.class, "failed");
}
@Test
public void testInfiniteRetry() {
AssertSubscriber<Integer> subscriber = AssertSubscriber.create(0);
failingAfter2
.onFailure().retry().when(v -> v)
.subscribe(subscriber);
subscriber.request(8);
subscriber.assertItems(1, 2, 1, 2, 1, 2, 1, 2)
.assertNotTerminated();
subscriber.cancel();
}
Multi<String> getMultiWithManualExponentialRetry() {
AtomicInteger i = new AtomicInteger();
return Multi.createFrom().<String> emitter(s -> {
if (i.incrementAndGet() == 4) {
s.emit("hey");
} else {
s.fail(new RuntimeException("test " + i));
}
}).onFailure().retry().when(
repeat -> Multi.createBy().combining().streams(repeat, Multi.createFrom().range(1, 4)).asTuple()
.map(Tuple2::getItem2)
.onItem().transformToUni(time -> Uni.createFrom().item(time)
.onItem().delayIt().by(Duration.ofMillis(time)))
.concatenate());
}
@Test
public void testManualExponentialRetry() {
AssertSubscriber<String> subscriber = getMultiWithManualExponentialRetry()
.subscribe().withSubscriber(AssertSubscriber.create(100));
subscriber
.await(Duration.ofSeconds(10))
.assertItems("hey")
.assertCompleted();
}
@Test
public void testRetryWithRandomBackoff() {
Exception exception = new IOException("boom retry");
AssertSubscriber<Integer> subscriber = Multi.createFrom().<Integer> emitter(e -> {
e.emit(0);
e.emit(1);
e.fail(exception);
})
.onFailure().retry().withBackOff(Duration.ofMillis(10), Duration.ofHours(1)).withJitter(0.1)
.atMost(4)
.subscribe().withSubscriber(AssertSubscriber.create(100));
await().until(() -> subscriber.getItems().size() >= 10);
subscriber
.assertItems(0, 1, 0, 1, 0, 1, 0, 1, 0, 1) // Initial subscription + 4 retries
.assertFailedWith(IllegalStateException.class, "Retries exhausted");
}
@Test
public void testRetryWithRandomBackoffAndDefaultJitter() {
Exception exception = new IOException("boom retry");
AssertSubscriber<Integer> subscriber = Multi.createBy().concatenating()
.streams(Multi.createFrom().range(0, 2), Multi.createFrom().failure(exception))
.onFailure().retry().withBackOff(Duration.ofMillis(100), Duration.ofHours(1))
.atMost(4)
.subscribe().withSubscriber(AssertSubscriber.create(100));
await().until(() -> subscriber.getItems().size() >= 10);
subscriber
.assertItems(0, 1, 0, 1, 0, 1, 0, 1, 0, 1) // Initial subscription + 4 retries
.assertFailedWith(IllegalStateException.class, "Retries exhausted: 4/4");
}
@Test
public void testRetryWithDefaultMax() {
Exception exception = new IOException("boom retry");
AssertSubscriber<Integer> subscriber = Multi.createBy().concatenating()
.streams(Multi.createFrom().range(0, 2), Multi.createFrom().failure(exception))
.onFailure().retry().withBackOff(Duration.ofMillis(10)).withJitter(0.0)
.atMost(4)
.subscribe().withSubscriber(AssertSubscriber.create(100));
await()
.atMost(1, TimeUnit.MINUTES)
.until(() -> subscriber.getItems().size() >= 10);
subscriber
.assertItems(0, 1, 0, 1, 0, 1, 0, 1, 0, 1) // Initial subscription + 4 retries
.assertFailedWith(IllegalStateException.class, "Retries exhausted: 4/4");
}
}