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MockSendProducerFactory.java
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MockSendProducerFactory.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.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.nio.ByteBuffer;
import java.util.Queue;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import javax.annotation.Nullable;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.TopicPartition;
import org.apache.pekko.kafka.ProducerMessage;
import org.apache.pekko.kafka.javadsl.SendProducer;
import org.apache.pekko.kafka.testkit.ProducerResultFactory;
/**
* Creates mock {@code SendProducer}s.
*/
final class MockSendProducerFactory implements SendProducerFactory {
private final String targetTopic;
private final Queue<ProducerRecord<String, ByteBuffer>> published;
@Nullable private final RuntimeException exception;
final boolean shouldThrowException;
private final boolean blocking;
private final AtomicBoolean wait = new AtomicBoolean();
private final AtomicInteger counter = new AtomicInteger();
private MockSendProducerFactory(final String targetTopic,
final Queue<ProducerRecord<String, ByteBuffer>> published,
final boolean blocking,
final boolean slow,
@Nullable final RuntimeException exception,
final boolean shouldThrowException) {
this.targetTopic = targetTopic;
this.published = published;
this.blocking = blocking;
wait.set(slow);
this.exception = exception;
this.shouldThrowException = shouldThrowException;
}
public static MockSendProducerFactory getInstance(
final String targetTopic, final Queue<ProducerRecord<String, ByteBuffer>> published) {
return new MockSendProducerFactory(targetTopic, published, false, false, null, false);
}
public static MockSendProducerFactory getInstance(final String targetTopic,
final Queue<ProducerRecord<String, ByteBuffer>> published,
final RuntimeException exception,
final boolean shouldThrowException) {
return new MockSendProducerFactory(targetTopic, published, false, false, exception, shouldThrowException);
}
/**
* Never publishes any message, returns futures that never complete.
*/
public static MockSendProducerFactory getBlockingInstance(final String targetTopic,
final Queue<ProducerRecord<String, ByteBuffer>> published) {
return new MockSendProducerFactory(targetTopic, published, true, false, null, false);
}
/**
* Blocks 1 second for the first message published. Continues to operate normally afterwards.
*/
public static MockSendProducerFactory getSlowStartInstance(final String targetTopic,
final Queue<ProducerRecord<String, ByteBuffer>> published) {
return new MockSendProducerFactory(targetTopic, published, false, true, null, false);
}
@Override
public SendProducer<String, ByteBuffer> newSendProducer() {
final SendProducer<String, ByteBuffer> producer = mock(SendProducer.class);
if (blocking) {
when(producer.sendEnvelope(any(ProducerMessage.Envelope.class)))
.thenAnswer(invocationOnMock -> {
// simulate slow publishing
Thread.sleep(1000);
// always return uncompleted future
return new CompletableFuture<>();
});
} else if (exception == null) {
when(producer.sendEnvelope(any(ProducerMessage.Envelope.class)))
.thenAnswer(invocationOnMock -> {
// simulate slow start producer that blocks 1 sec for the very first message published
if (wait.getAndSet(false)) {
Thread.sleep(1000);
}
final ProducerMessage.Envelope<String, ByteBuffer, CompletableFuture<RecordMetadata>> envelope =
invocationOnMock.getArgument(0);
final RecordMetadata dummyMetadata =
new RecordMetadata(new TopicPartition(targetTopic, 5),
0L, 0L, 0L, 0L, 0, 0);
final ProducerMessage.Message<String, ByteBuffer, CompletableFuture<RecordMetadata>> message =
(ProducerMessage.Message<String, ByteBuffer, CompletableFuture<RecordMetadata>>) envelope;
published.offer(message.record());
return CompletableFuture.completedStage(ProducerResultFactory.result(dummyMetadata, message));
});
} else if (!shouldThrowException){
when(producer.sendEnvelope(any(ProducerMessage.Envelope.class)))
.thenReturn(CompletableFuture.failedStage(exception));
} else {
if (counter.get() == 0) {
when(producer.sendEnvelope(any(ProducerMessage.Envelope.class)))
.thenThrow(exception);
counter.getAndIncrement();
} else {
when(producer.sendEnvelope(any(ProducerMessage.Envelope.class)))
.thenReturn(CompletableFuture.failedStage(exception));
}
}
return producer;
}
}