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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.clients.consumer;
import org.apache.kafka.clients.Metadata;
import org.apache.kafka.clients.consumer.internals.NoOpConsumerRebalanceListener;
import org.apache.kafka.clients.consumer.internals.SubscriptionState;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.Metric;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.WakeupException;
import org.apache.kafka.common.utils.LogContext;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalLong;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static java.util.Collections.singleton;
import static org.apache.kafka.clients.consumer.KafkaConsumer.DEFAULT_CLOSE_TIMEOUT_MS;
/**
* A mock of the {@link Consumer} interface you can use for testing code that uses Kafka. This class is not
* threadsafe . However, you can use the {@link #schedulePollTask(Runnable)} method to write multithreaded tests
* where a driver thread waits for {@link #poll(Duration)} to be called by a background thread and then can safely perform
* operations during a callback.
*/
public class MockConsumer implements Consumer {
private final Map> partitions;
private final SubscriptionState subscriptions;
private final Map beginningOffsets;
private final Map endOffsets;
private final Map committed;
private final Queue pollTasks;
private final Set paused;
private Map>> records;
private KafkaException pollException;
private KafkaException offsetsException;
private AtomicBoolean wakeup;
private Duration lastPollTimeout;
private boolean closed;
private boolean shouldRebalance;
public MockConsumer(OffsetResetStrategy offsetResetStrategy) {
this.subscriptions = new SubscriptionState(new LogContext(), offsetResetStrategy);
this.partitions = new HashMap<>();
this.records = new HashMap<>();
this.paused = new HashSet<>();
this.closed = false;
this.beginningOffsets = new HashMap<>();
this.endOffsets = new HashMap<>();
this.pollTasks = new LinkedList<>();
this.pollException = null;
this.wakeup = new AtomicBoolean(false);
this.committed = new HashMap<>();
this.shouldRebalance = false;
}
@Override
public synchronized Set assignment() {
return this.subscriptions.assignedPartitions();
}
/** Simulate a rebalance event. */
public synchronized void rebalance(Collection newAssignment) {
// TODO: Rebalance callbacks
this.records.clear();
this.subscriptions.assignFromSubscribed(newAssignment);
}
@Override
public synchronized Set subscription() {
return this.subscriptions.subscription();
}
@Override
public synchronized void subscribe(Collection topics) {
subscribe(topics, new NoOpConsumerRebalanceListener());
}
@Override
public synchronized void subscribe(Pattern pattern, final ConsumerRebalanceListener listener) {
ensureNotClosed();
committed.clear();
this.subscriptions.subscribe(pattern, listener);
Set topicsToSubscribe = new HashSet<>();
for (String topic: partitions.keySet()) {
if (pattern.matcher(topic).matches() &&
!subscriptions.subscription().contains(topic))
topicsToSubscribe.add(topic);
}
ensureNotClosed();
this.subscriptions.subscribeFromPattern(topicsToSubscribe);
final Set assignedPartitions = new HashSet<>();
for (final String topic : topicsToSubscribe) {
for (final PartitionInfo info : this.partitions.get(topic)) {
assignedPartitions.add(new TopicPartition(topic, info.partition()));
}
}
subscriptions.assignFromSubscribed(assignedPartitions);
}
@Override
public synchronized void subscribe(Pattern pattern) {
subscribe(pattern, new NoOpConsumerRebalanceListener());
}
@Override
public synchronized void subscribe(Collection topics, final ConsumerRebalanceListener listener) {
ensureNotClosed();
committed.clear();
this.subscriptions.subscribe(new HashSet<>(topics), listener);
}
@Override
public synchronized void assign(Collection partitions) {
ensureNotClosed();
committed.clear();
this.subscriptions.assignFromUser(new HashSet<>(partitions));
}
@Override
public synchronized void unsubscribe() {
ensureNotClosed();
committed.clear();
subscriptions.unsubscribe();
}
@Deprecated
@Override
public synchronized ConsumerRecords poll(long timeout) {
return poll(Duration.ofMillis(timeout));
}
@Override
public synchronized ConsumerRecords poll(final Duration timeout) {
ensureNotClosed();
lastPollTimeout = timeout;
// Synchronize around the entire execution so new tasks to be triggered on subsequent poll calls can be added in
// the callback
synchronized (pollTasks) {
Runnable task = pollTasks.poll();
if (task != null)
task.run();
}
if (wakeup.get()) {
wakeup.set(false);
throw new WakeupException();
}
if (pollException != null) {
RuntimeException exception = this.pollException;
this.pollException = null;
throw exception;
}
// Handle seeks that need to wait for a poll() call to be processed
for (TopicPartition tp : subscriptions.assignedPartitions())
if (!subscriptions.hasValidPosition(tp))
updateFetchPosition(tp);
// update the consumed offset
final Map>> results = new HashMap<>();
final List toClear = new ArrayList<>();
for (Map.Entry>> entry : this.records.entrySet()) {
if (!subscriptions.isPaused(entry.getKey())) {
final List> recs = entry.getValue();
for (final ConsumerRecord rec : recs) {
long position = subscriptions.position(entry.getKey()).offset;
if (beginningOffsets.get(entry.getKey()) != null && beginningOffsets.get(entry.getKey()) > position) {
throw new OffsetOutOfRangeException(Collections.singletonMap(entry.getKey(), position));
}
if (assignment().contains(entry.getKey()) && rec.offset() >= position) {
results.computeIfAbsent(entry.getKey(), partition -> new ArrayList<>()).add(rec);
Metadata.LeaderAndEpoch leaderAndEpoch = new Metadata.LeaderAndEpoch(Optional.empty(), rec.leaderEpoch());
SubscriptionState.FetchPosition newPosition = new SubscriptionState.FetchPosition(
rec.offset() + 1, rec.leaderEpoch(), leaderAndEpoch);
subscriptions.position(entry.getKey(), newPosition);
}
}
toClear.add(entry.getKey());
}
}
toClear.forEach(p -> this.records.remove(p));
return new ConsumerRecords<>(results);
}
public synchronized void addRecord(ConsumerRecord record) {
ensureNotClosed();
TopicPartition tp = new TopicPartition(record.topic(), record.partition());
Set currentAssigned = this.subscriptions.assignedPartitions();
if (!currentAssigned.contains(tp))
throw new IllegalStateException("Cannot add records for a partition that is not assigned to the consumer");
List> recs = this.records.computeIfAbsent(tp, k -> new ArrayList<>());
recs.add(record);
}
/**
* @deprecated Use {@link #setPollException(KafkaException)} instead
*/
@Deprecated
public synchronized void setException(KafkaException exception) {
setPollException(exception);
}
public synchronized void setPollException(KafkaException exception) {
this.pollException = exception;
}
public synchronized void setOffsetsException(KafkaException exception) {
this.offsetsException = exception;
}
@Override
public synchronized void commitAsync(Map offsets, OffsetCommitCallback callback) {
ensureNotClosed();
for (Map.Entry entry : offsets.entrySet())
committed.put(entry.getKey(), entry.getValue());
if (callback != null) {
callback.onComplete(offsets, null);
}
}
@Override
public synchronized void commitSync(Map offsets) {
commitAsync(offsets, null);
}
@Override
public synchronized void commitAsync() {
commitAsync(null);
}
@Override
public synchronized void commitAsync(OffsetCommitCallback callback) {
ensureNotClosed();
commitAsync(this.subscriptions.allConsumed(), callback);
}
@Override
public synchronized void commitSync() {
commitSync(this.subscriptions.allConsumed());
}
@Override
public synchronized void commitSync(Duration timeout) {
commitSync(this.subscriptions.allConsumed());
}
@Override
public void commitSync(Map offsets, final Duration timeout) {
commitSync(offsets);
}
@Override
public synchronized void seek(TopicPartition partition, long offset) {
ensureNotClosed();
subscriptions.seek(partition, offset);
}
@Override
public void seek(TopicPartition partition, OffsetAndMetadata offsetAndMetadata) {
ensureNotClosed();
subscriptions.seek(partition, offsetAndMetadata.offset());
}
@Deprecated
@Override
public synchronized OffsetAndMetadata committed(final TopicPartition partition) {
return committed(singleton(partition)).get(partition);
}
@Deprecated
@Override
public OffsetAndMetadata committed(final TopicPartition partition, final Duration timeout) {
return committed(partition);
}
@Override
public synchronized Map committed(final Set partitions) {
ensureNotClosed();
return partitions.stream()
.filter(committed::containsKey)
.collect(Collectors.toMap(tp -> tp, tp -> subscriptions.isAssigned(tp) ?
committed.get(tp) : new OffsetAndMetadata(0)));
}
@Override
public synchronized Map committed(final Set partitions, final Duration timeout) {
return committed(partitions);
}
@Override
public synchronized long position(TopicPartition partition) {
ensureNotClosed();
if (!this.subscriptions.isAssigned(partition))
throw new IllegalArgumentException("You can only check the position for partitions assigned to this consumer.");
SubscriptionState.FetchPosition position = this.subscriptions.position(partition);
if (position == null) {
updateFetchPosition(partition);
position = this.subscriptions.position(partition);
}
return position.offset;
}
@Override
public synchronized long position(TopicPartition partition, final Duration timeout) {
return position(partition);
}
@Override
public synchronized void seekToBeginning(Collection partitions) {
ensureNotClosed();
subscriptions.requestOffsetReset(partitions, OffsetResetStrategy.EARLIEST);
}
public synchronized void updateBeginningOffsets(Map newOffsets) {
beginningOffsets.putAll(newOffsets);
}
@Override
public synchronized void seekToEnd(Collection partitions) {
ensureNotClosed();
subscriptions.requestOffsetReset(partitions, OffsetResetStrategy.LATEST);
}
public synchronized void updateEndOffsets(final Map newOffsets) {
endOffsets.putAll(newOffsets);
}
@Override
public synchronized Map metrics() {
ensureNotClosed();
return Collections.emptyMap();
}
@Override
public synchronized List partitionsFor(String topic) {
ensureNotClosed();
return this.partitions.getOrDefault(topic, Collections.emptyList());
}
@Override
public synchronized Map> listTopics() {
ensureNotClosed();
return partitions;
}
public synchronized void updatePartitions(String topic, List partitions) {
ensureNotClosed();
this.partitions.put(topic, partitions);
}
@Override
public synchronized void pause(Collection partitions) {
for (TopicPartition partition : partitions) {
subscriptions.pause(partition);
paused.add(partition);
}
}
@Override
public synchronized void resume(Collection partitions) {
for (TopicPartition partition : partitions) {
subscriptions.resume(partition);
paused.remove(partition);
}
}
@Override
public synchronized Map offsetsForTimes(Map timestampsToSearch) {
throw new UnsupportedOperationException("Not implemented yet.");
}
@Override
public synchronized Map beginningOffsets(Collection partitions) {
if (offsetsException != null) {
RuntimeException exception = this.offsetsException;
this.offsetsException = null;
throw exception;
}
Map result = new HashMap<>();
for (TopicPartition tp : partitions) {
Long beginningOffset = beginningOffsets.get(tp);
if (beginningOffset == null)
throw new IllegalStateException("The partition " + tp + " does not have a beginning offset.");
result.put(tp, beginningOffset);
}
return result;
}
@Override
public synchronized Map endOffsets(Collection partitions) {
if (offsetsException != null) {
RuntimeException exception = this.offsetsException;
this.offsetsException = null;
throw exception;
}
Map result = new HashMap<>();
for (TopicPartition tp : partitions) {
Long endOffset = endOffsets.get(tp);
if (endOffset == null)
throw new IllegalStateException("The partition " + tp + " does not have an end offset.");
result.put(tp, endOffset);
}
return result;
}
@Override
public void close() {
close(Duration.ofMillis(DEFAULT_CLOSE_TIMEOUT_MS));
}
@Override
public synchronized void close(Duration timeout) {
this.closed = true;
}
public synchronized boolean closed() {
return this.closed;
}
@Override
public synchronized void wakeup() {
wakeup.set(true);
}
/**
* Schedule a task to be executed during a poll(). One enqueued task will be executed per {@link #poll(Duration)}
* invocation. You can use this repeatedly to mock out multiple responses to poll invocations.
* @param task the task to be executed
*/
public synchronized void schedulePollTask(Runnable task) {
synchronized (pollTasks) {
pollTasks.add(task);
}
}
public synchronized void scheduleNopPollTask() {
schedulePollTask(() -> { });
}
public synchronized Set paused() {
return Collections.unmodifiableSet(new HashSet<>(paused));
}
private void ensureNotClosed() {
if (this.closed)
throw new IllegalStateException("This consumer has already been closed.");
}
private void updateFetchPosition(TopicPartition tp) {
if (subscriptions.isOffsetResetNeeded(tp)) {
resetOffsetPosition(tp);
} else if (!committed.containsKey(tp)) {
subscriptions.requestOffsetReset(tp);
resetOffsetPosition(tp);
} else {
subscriptions.seek(tp, committed.get(tp).offset());
}
}
private void resetOffsetPosition(TopicPartition tp) {
OffsetResetStrategy strategy = subscriptions.resetStrategy(tp);
Long offset;
if (strategy == OffsetResetStrategy.EARLIEST) {
offset = beginningOffsets.get(tp);
if (offset == null)
throw new IllegalStateException("MockConsumer didn't have beginning offset specified, but tried to seek to beginning");
} else if (strategy == OffsetResetStrategy.LATEST) {
offset = endOffsets.get(tp);
if (offset == null)
throw new IllegalStateException("MockConsumer didn't have end offset specified, but tried to seek to end");
} else {
throw new NoOffsetForPartitionException(tp);
}
seek(tp, offset);
}
@Override
public List partitionsFor(String topic, Duration timeout) {
return partitionsFor(topic);
}
@Override
public Map> listTopics(Duration timeout) {
return listTopics();
}
@Override
public Map offsetsForTimes(Map timestampsToSearch,
Duration timeout) {
return offsetsForTimes(timestampsToSearch);
}
@Override
public Map beginningOffsets(Collection partitions, Duration timeout) {
return beginningOffsets(partitions);
}
@Override
public Map endOffsets(Collection partitions, Duration timeout) {
return endOffsets(partitions);
}
@Override
public OptionalLong currentLag(TopicPartition topicPartition) {
if (endOffsets.containsKey(topicPartition)) {
return OptionalLong.of(endOffsets.get(topicPartition) - position(topicPartition));
} else {
// if the test doesn't bother to set an end offset, we assume it wants to model being caught up.
return OptionalLong.of(0L);
}
}
@Override
public ConsumerGroupMetadata groupMetadata() {
return new ConsumerGroupMetadata("dummy.group.id", 1, "1", Optional.empty());
}
@Override
public void enforceRebalance() {
enforceRebalance(null);
}
@Override
public void enforceRebalance(final String reason) {
shouldRebalance = true;
}
public boolean shouldRebalance() {
return shouldRebalance;
}
public void resetShouldRebalance() {
shouldRebalance = false;
}
public Duration lastPollTimeout() {
return lastPollTimeout;
}
}
