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org.springframework.kafka.requestreply.ReplyingKafkaTemplate Maven / Gradle / Ivy
/*
* Copyright 2018-2020 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.kafka.requestreply;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.time.Instant;
import java.util.Collection;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.function.Function;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.header.Header;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeader;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.SmartLifecycle;
import org.springframework.core.log.LogAccessor;
import org.springframework.kafka.KafkaException;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import org.springframework.kafka.listener.BatchMessageListener;
import org.springframework.kafka.listener.ContainerProperties;
import org.springframework.kafka.listener.GenericMessageListenerContainer;
import org.springframework.kafka.listener.ListenerUtils;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.kafka.support.TopicPartitionOffset;
import org.springframework.kafka.support.serializer.DeserializationException;
import org.springframework.kafka.support.serializer.ErrorHandlingDeserializer;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.util.Assert;
/**
* A KafkaTemplate that implements request/reply semantics.
*
* @param the key type.
* @param the outbound data type.
* @param the reply data type.
*
* @author Gary Russell
* @author Artem Bilan
*
* @since 2.1.3
*
*/
public class ReplyingKafkaTemplate extends KafkaTemplate implements BatchMessageListener,
InitializingBean, SmartLifecycle, DisposableBean, ReplyingKafkaOperations {
private static final String WITH_CORRELATION_ID = " with correlationId: ";
private static final int FIVE = 5;
private static final Duration DEFAULT_REPLY_TIMEOUT = Duration.ofSeconds(FIVE);
private final GenericMessageListenerContainer replyContainer;
private final ConcurrentMap> futures = new ConcurrentHashMap<>();
private final byte[] replyTopic;
private final byte[] replyPartition;
private TaskScheduler scheduler = new ThreadPoolTaskScheduler();
private int phase;
private boolean autoStartup = true;
private Duration defaultReplyTimeout = DEFAULT_REPLY_TIMEOUT;
private boolean schedulerSet;
private boolean sharedReplyTopic;
private Function, CorrelationKey> correlationStrategy = ReplyingKafkaTemplate::defaultCorrelationIdStrategy;
private String correlationHeaderName = KafkaHeaders.CORRELATION_ID;
private String replyTopicHeaderName = KafkaHeaders.REPLY_TOPIC;
private String replyPartitionHeaderName = KafkaHeaders.REPLY_PARTITION;
private volatile boolean running;
private volatile boolean schedulerInitialized;
public ReplyingKafkaTemplate(ProducerFactory producerFactory,
GenericMessageListenerContainer replyContainer) {
this(producerFactory, replyContainer, false);
}
public ReplyingKafkaTemplate(ProducerFactory producerFactory,
GenericMessageListenerContainer replyContainer, boolean autoFlush) {
super(producerFactory, autoFlush);
Assert.notNull(replyContainer, "'replyContainer' cannot be null");
this.replyContainer = replyContainer;
this.replyContainer.setupMessageListener(this);
ContainerProperties properties = this.replyContainer.getContainerProperties();
String tempReplyTopic = null;
byte[] tempReplyPartition = null;
TopicPartitionOffset[] topicPartitionsToAssign = properties.getTopicPartitions();
String[] topics = properties.getTopics();
if (topics != null && topics.length == 1) {
tempReplyTopic = topics[0];
}
else if (topicPartitionsToAssign != null && topicPartitionsToAssign.length == 1) {
TopicPartitionOffset topicPartitionOffset = topicPartitionsToAssign[0];
Assert.notNull(topicPartitionOffset, "'topicPartitionsToAssign' must not be null");
tempReplyTopic = topicPartitionOffset.getTopic();
ByteBuffer buffer = ByteBuffer.allocate(4); // NOSONAR magic #
buffer.putInt(topicPartitionOffset.getPartition());
tempReplyPartition = buffer.array();
}
if (tempReplyTopic == null) {
this.replyTopic = null;
this.replyPartition = null;
this.logger.debug(() -> "Could not determine container's reply topic/partition; senders must populate "
+ "at least the " + KafkaHeaders.REPLY_TOPIC + " header, and optionally the "
+ KafkaHeaders.REPLY_PARTITION + " header");
}
else {
this.replyTopic = tempReplyTopic.getBytes(StandardCharsets.UTF_8);
this.replyPartition = tempReplyPartition;
}
}
public void setTaskScheduler(TaskScheduler scheduler) {
Assert.notNull(scheduler, "'scheduler' cannot be null");
this.scheduler = scheduler;
this.schedulerSet = true;
}
/**
* Return the reply timeout used if no replyTimeout is provided in the
* {@link #sendAndReceive(ProducerRecord, Duration)} call.
* @return the timeout.
* @since 2.3
*/
protected Duration getDefaultReplyTimeout() {
return this.defaultReplyTimeout;
}
/**
* Set the reply timeout used if no replyTimeout is provided in the
* {@link #sendAndReceive(ProducerRecord, Duration)} call.
* @param defaultReplyTimeout the timeout.
* @since 2.3
*/
public void setDefaultReplyTimeout(Duration defaultReplyTimeout) {
Assert.notNull(defaultReplyTimeout, "'defaultReplyTimeout' cannot be null");
Assert.isTrue(defaultReplyTimeout.toMillis() >= 0, "'replyTimeout' must be >= 0");
this.defaultReplyTimeout = defaultReplyTimeout;
}
@Override
public boolean isRunning() {
return this.running;
}
@Override
public int getPhase() {
return this.phase;
}
public void setPhase(int phase) {
this.phase = phase;
}
@Override
public boolean isAutoStartup() {
return this.autoStartup;
}
public void setAutoStartup(boolean autoStartup) {
this.autoStartup = autoStartup;
}
/**
* Return the topics/partitions assigned to the replying listener container.
* @return the topics/partitions.
*/
public Collection getAssignedReplyTopicPartitions() {
return this.replyContainer.getAssignedPartitions();
}
/**
* Set to true when multiple templates are using the same topic for replies. This
* simply changes logs for unexpected replies to debug instead of error.
* @param sharedReplyTopic true if using a shared topic.
* @since 2.2
*/
public void setSharedReplyTopic(boolean sharedReplyTopic) {
this.sharedReplyTopic = sharedReplyTopic;
}
/**
* Set a function to be called to establish a unique correlation key for each request
* record.
* @param correlationStrategy the function.
* @since 2.3
*/
public void setCorrelationIdStrategy(Function, CorrelationKey> correlationStrategy) {
Assert.notNull(correlationStrategy, "'correlationStrategy' cannot be null");
this.correlationStrategy = correlationStrategy;
}
/**
* Set a custom header name for the correlation id. Default
* {@link KafkaHeaders#CORRELATION_ID}.
* @param correlationHeaderName the header name.
* @since 2.3
*/
public void setCorrelationHeaderName(String correlationHeaderName) {
Assert.notNull(correlationHeaderName, "'correlationHeaderName' cannot be null");
this.correlationHeaderName = correlationHeaderName;
}
/**
* Set a custom header name for the reply topic. Default
* {@link KafkaHeaders#REPLY_TOPIC}.
* @param replyTopicHeaderName the header name.
* @since 2.3
*/
public void setReplyTopicHeaderName(String replyTopicHeaderName) {
Assert.notNull(replyTopicHeaderName, "'replyTopicHeaderName' cannot be null");
this.replyTopicHeaderName = replyTopicHeaderName;
}
/**
* Set a custom header name for the reply partition. Default
* {@link KafkaHeaders#REPLY_PARTITION}.
* @param replyPartitionHeaderName the reply partition header name.
* @since 2.3
*/
public void setReplyPartitionHeaderName(String replyPartitionHeaderName) {
Assert.notNull(replyPartitionHeaderName, "'replyPartitionHeaderName' cannot be null");
this.replyPartitionHeaderName = replyPartitionHeaderName;
}
@Override
public void afterPropertiesSet() {
if (!this.schedulerSet && !this.schedulerInitialized) {
((ThreadPoolTaskScheduler) this.scheduler).initialize();
this.schedulerInitialized = true;
}
}
@Override
public synchronized void start() {
if (!this.running) {
try {
afterPropertiesSet();
}
catch (Exception e) {
throw new KafkaException("Failed to initialize", e);
}
this.replyContainer.start();
this.running = true;
}
}
@Override
public synchronized void stop() {
if (this.running) {
this.running = false;
this.replyContainer.stop();
this.futures.clear();
}
}
@Override
public void stop(Runnable callback) {
stop();
callback.run();
}
@Override
public RequestReplyFuture sendAndReceive(ProducerRecord record) {
return sendAndReceive(record, null);
}
@Override
public RequestReplyFuture sendAndReceive(ProducerRecord record, @Nullable Duration replyTimeout) {
Assert.state(this.running, "Template has not been start()ed"); // NOSONAR (sync)
CorrelationKey correlationId = this.correlationStrategy.apply(record);
Assert.notNull(correlationId, "the created 'correlationId' cannot be null");
Headers headers = record.headers();
boolean hasReplyTopic = headers.lastHeader(KafkaHeaders.REPLY_TOPIC) != null;
if (!hasReplyTopic && this.replyTopic != null) {
headers.add(new RecordHeader(this.replyTopicHeaderName, this.replyTopic));
if (this.replyPartition != null) {
headers.add(new RecordHeader(this.replyPartitionHeaderName, this.replyPartition));
}
}
headers.add(new RecordHeader(this.correlationHeaderName, correlationId.getCorrelationId()));
this.logger.debug(() -> "Sending: " + record + WITH_CORRELATION_ID + correlationId);
RequestReplyFuture future = new RequestReplyFuture<>();
this.futures.put(correlationId, future);
try {
future.setSendFuture(send(record));
}
catch (Exception e) {
this.futures.remove(correlationId);
throw new KafkaException("Send failed", e);
}
scheduleTimeout(record, correlationId, replyTimeout == null ? this.defaultReplyTimeout : replyTimeout);
return future;
}
private void scheduleTimeout(ProducerRecord record, CorrelationKey correlationId, Duration replyTimeout) {
this.scheduler.schedule(() -> {
RequestReplyFuture removed = this.futures.remove(correlationId);
if (removed != null) {
this.logger.warn(() -> "Reply timed out for: " + record + WITH_CORRELATION_ID + correlationId);
if (!handleTimeout(correlationId, removed)) {
removed.setException(new KafkaReplyTimeoutException("Reply timed out"));
}
}
}, Instant.now().plus(replyTimeout));
}
/**
* Used to inform subclasses that a request has timed out so they can clean up state
* and, optionally, complete the future.
* @param correlationId the correlation id.
* @param future the future.
* @return true to indicate the future has been completed.
* @since 2.3
*/
protected boolean handleTimeout(@SuppressWarnings("unused") CorrelationKey correlationId,
@SuppressWarnings("unused") RequestReplyFuture future) {
return false;
}
/**
* Return true if this correlation id is still active.
* @param correlationId the correlation id.
* @return true if pending.
* @since 2.3
*/
protected boolean isPending(CorrelationKey correlationId) {
return this.futures.containsKey(correlationId);
}
@Override
public void destroy() {
if (!this.schedulerSet) {
((ThreadPoolTaskScheduler) this.scheduler).destroy();
}
}
private static CorrelationKey defaultCorrelationIdStrategy(
@SuppressWarnings("unused") ProducerRecord record) {
UUID uuid = UUID.randomUUID();
byte[] bytes = new byte[16]; // NOSONAR magic #
ByteBuffer bb = ByteBuffer.wrap(bytes);
bb.putLong(uuid.getMostSignificantBits());
bb.putLong(uuid.getLeastSignificantBits());
return new CorrelationKey(bytes);
}
@Override
public void onMessage(List> data) {
data.forEach(record -> {
Header correlationHeader = record.headers().lastHeader(this.correlationHeaderName);
CorrelationKey correlationId = null;
if (correlationHeader != null) {
correlationId = new CorrelationKey(correlationHeader.value());
}
if (correlationId == null) {
this.logger.error(() -> "No correlationId found in reply: " + record
+ " - to use request/reply semantics, the responding server must return the correlation id "
+ " in the '" + this.correlationHeaderName + "' header");
}
else {
RequestReplyFuture future = this.futures.remove(correlationId);
CorrelationKey correlationKey = correlationId;
if (future == null) {
logLateArrival(record, correlationId);
}
else {
boolean ok = true;
if (record.value() == null) {
DeserializationException de = checkDeserialization(record, this.logger);
if (de != null) {
ok = false;
future.setException(de);
}
}
if (ok) {
this.logger.debug(() -> "Received: " + record + WITH_CORRELATION_ID + correlationKey);
future.set(record);
}
}
}
});
}
/**
* Return a {@link DeserializationException} if either the key or value failed
* deserialization; null otherwise. If you need to determine whether it was the key or
* value, call
* {@link ListenerUtils#getExceptionFromHeader(ConsumerRecord, String, LogAccessor)}
* with {@link ErrorHandlingDeserializer#KEY_DESERIALIZER_EXCEPTION_HEADER} and
* {@link ErrorHandlingDeserializer#VALUE_DESERIALIZER_EXCEPTION_HEADER} instead.
* @param record the record.
* @param logger a {@link LogAccessor}.
* @return the {@link DeserializationException} or {@code null}.
* @since 2.2.15
*/
@Nullable
public static DeserializationException checkDeserialization(ConsumerRecord record, LogAccessor logger) {
DeserializationException exception = ListenerUtils.getExceptionFromHeader(record,
ErrorHandlingDeserializer.VALUE_DESERIALIZER_EXCEPTION_HEADER, logger);
if (exception != null) {
logger.error(exception, () -> "Reply value deserialization failed for " + record.topic() + "-"
+ record.partition() + "@" + record.offset());
return exception;
}
exception = ListenerUtils.getExceptionFromHeader(record,
ErrorHandlingDeserializer.KEY_DESERIALIZER_EXCEPTION_HEADER, logger);
if (exception != null) {
logger.error(exception, () -> "Reply key deserialization failed for " + record.topic() + "-"
+ record.partition() + "@" + record.offset());
return exception;
}
return null;
}
protected void logLateArrival(ConsumerRecord record, CorrelationKey correlationId) {
if (this.sharedReplyTopic) {
this.logger.debug(() -> missingCorrelationLogMessage(record, correlationId));
}
else {
this.logger.error(() -> missingCorrelationLogMessage(record, correlationId));
}
}
private String missingCorrelationLogMessage(ConsumerRecord record, CorrelationKey correlationId) {
return "No pending reply: " + record + WITH_CORRELATION_ID
+ correlationId + ", perhaps timed out, or using a shared reply topic";
}
}
