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RestartableKafkaConsumerStreamTest.java
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RestartableKafkaConsumerStreamTest.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.messaging.kafka;
import static org.mockito.ArgumentMatchers.same;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.function.BiConsumer;
import org.eclipse.ditto.base.service.config.supervision.ExponentialBackOffConfig;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.MockitoJUnitRunner;
import akka.Done;
@RunWith(MockitoJUnitRunner.class)
public final class RestartableKafkaConsumerStreamTest {
@Mock
private ExponentialBackOffConfig exponentialBackOffConfigMock;
@Test
public void whenCompleteDelegatesToKafkaConsumerStream() {
final KafkaConsumerStream kafkaConsumerStream = Mockito.mock(KafkaConsumerStream.class);
mockExponentialBackOffConfigWith(Duration.ofMillis(100), Duration.ofSeconds(60));
final RestartableKafkaConsumerStream restartableKafkaConsumerStream =
new RestartableKafkaConsumerStream(() -> kafkaConsumerStream, exponentialBackOffConfigMock);
final BiConsumer<? super Done, ? super Throwable> handler = (result, error) -> {};
restartableKafkaConsumerStream.whenComplete(handler);
verify(kafkaConsumerStream).whenComplete(same(handler));
}
@Test
public void stopDelegatesToKafkaConsumerStream() {
final KafkaConsumerStream kafkaConsumerStream = Mockito.mock(KafkaConsumerStream.class);
mockExponentialBackOffConfigWith(Duration.ofMillis(100), Duration.ofSeconds(60));
final RestartableKafkaConsumerStream restartableKafkaConsumerStream =
new RestartableKafkaConsumerStream(() -> kafkaConsumerStream, exponentialBackOffConfigMock);
restartableKafkaConsumerStream.stop();
verify(kafkaConsumerStream).stop();
}
@Test
public void restartStopsAndCreatesANewStream() throws InterruptedException {
final KafkaConsumerStream kafkaConsumerStream = Mockito.mock(KafkaConsumerStream.class);
when(kafkaConsumerStream.stop()).thenReturn(CompletableFuture.completedFuture(Done.getInstance()));
mockExponentialBackOffConfigWith(Duration.ofMillis(100), Duration.ofSeconds(60), 1.0);
final CountDownLatch countDownLatch = new CountDownLatch(2);
final RestartableKafkaConsumerStream restartableKafkaConsumerStream =
new RestartableKafkaConsumerStream(() -> {
countDownLatch.countDown();
return kafkaConsumerStream;
}, exponentialBackOffConfigMock);
restartableKafkaConsumerStream.restart();
verify(kafkaConsumerStream).stop();
countDownLatch.await(1, TimeUnit.SECONDS);
}
private void mockExponentialBackOffConfigWith(final Duration min, final Duration max) {
when(exponentialBackOffConfigMock.getMin()).thenReturn(min);
when(exponentialBackOffConfigMock.getMax()).thenReturn(max);
}
private void mockExponentialBackOffConfigWith(final Duration min, final Duration max, final double randomFactor) {
when(exponentialBackOffConfigMock.getMin()).thenReturn(min);
when(exponentialBackOffConfigMock.getMax()).thenReturn(max);
when(exponentialBackOffConfigMock.getRandomFactor()).thenReturn(randomFactor);
}
}