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/*
* Copyright 2018-2024 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.retrytopic;
import java.time.Clock;
import java.time.Instant;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.kafka.listener.ExceptionClassifier;
import org.springframework.kafka.listener.ListenerExecutionFailedException;
import org.springframework.kafka.listener.TimestampedException;
import org.springframework.kafka.retrytopic.DestinationTopic.Type;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
*
* Default implementation of the {@link DestinationTopicResolver} interface.
* The container is closed when a {@link ContextRefreshedEvent} is received
* and no more destinations can be added after that.
*
* @author Tomaz Fernandes
* @author Gary Russell
* @author Yvette Quinby
* @author Adrian Chlebosz
* @since 2.7
*
*/
public class DefaultDestinationTopicResolver extends ExceptionClassifier
implements DestinationTopicResolver, ApplicationListener, ApplicationContextAware {
private static final String NO_OPS_SUFFIX = "-noOps";
private static final List> FRAMEWORK_EXCEPTIONS =
Arrays.asList(ListenerExecutionFailedException.class, TimestampedException.class);
private final Map> sourceDestinationsHolderMap;
private final Clock clock;
private ApplicationContext applicationContext;
private boolean contextRefreshed;
/**
* Constructs an instance with the given clock.
* @param clock the clock to be used for time-based operations
* such as verifying timeouts.
* @since 2.9
*/
public DefaultDestinationTopicResolver(Clock clock) {
this.clock = clock;
this.sourceDestinationsHolderMap = new ConcurrentHashMap<>();
this.contextRefreshed = false;
}
/**
* Constructs an instance with a default clock.
* @since 2.9
*/
public DefaultDestinationTopicResolver() {
this(Clock.systemUTC());
}
@Override
public DestinationTopic resolveDestinationTopic(String mainListenerId, String topic, Integer attempt, Exception e,
long originalTimestamp) {
DestinationTopicHolder destinationTopicHolder = getDestinationHolderFor(mainListenerId, topic);
return destinationTopicHolder.getSourceDestination().isDltTopic()
? handleDltProcessingFailure(destinationTopicHolder, e)
: destinationTopicHolder.getSourceDestination().shouldRetryOn(attempt, maybeUnwrapException(e))
&& isNotFatalException(e)
&& !isPastTimout(originalTimestamp, destinationTopicHolder)
? resolveRetryDestination(mainListenerId, destinationTopicHolder, e)
: getDltOrNoOpsDestination(mainListenerId, topic, e);
}
private Boolean isNotFatalException(Exception e) {
return getClassifier().classify(e);
}
private Throwable maybeUnwrapException(Throwable e) {
return FRAMEWORK_EXCEPTIONS
.stream()
.filter(frameworkException -> frameworkException.isAssignableFrom(e.getClass()))
.map(frameworkException -> maybeUnwrapException(e.getCause()))
.findFirst()
.orElse(e);
}
private boolean isPastTimout(long originalTimestamp, DestinationTopicHolder destinationTopicHolder) {
long timeout = destinationTopicHolder.getNextDestination().getDestinationTimeout();
return timeout != RetryTopicConstants.NOT_SET &&
Instant.now(this.clock).toEpochMilli() > originalTimestamp + timeout;
}
private DestinationTopic handleDltProcessingFailure(DestinationTopicHolder destinationTopicHolder, Exception e) {
return destinationTopicHolder.getSourceDestination().isAlwaysRetryOnDltFailure()
&& isNotFatalException(e)
? destinationTopicHolder.getSourceDestination()
: destinationTopicHolder.getNextDestination();
}
@SuppressWarnings("deprecation")
private DestinationTopic resolveRetryDestination(String mainListenerId, DestinationTopicHolder destinationTopicHolder, Exception e) {
if (destinationTopicHolder.getSourceDestination().isReusableRetryTopic()) {
return destinationTopicHolder.getSourceDestination();
}
if (isAlreadyDltDestination(destinationTopicHolder)) {
return getDltOrNoOpsDestination(mainListenerId, destinationTopicHolder.getSourceDestination().getDestinationName(), e);
}
return destinationTopicHolder.getNextDestination();
}
private static boolean isAlreadyDltDestination(DestinationTopicHolder destinationTopicHolder) {
return destinationTopicHolder.getNextDestination().isDltTopic();
}
@Override
public DestinationTopic getDestinationTopicByName(String mainListenerId, String topic) {
Map map = this.sourceDestinationsHolderMap.get(mainListenerId);
Assert.notNull(map, () -> "No destination resolution information for listener " + mainListenerId);
return Objects.requireNonNull(map.get(topic),
() -> "No DestinationTopic found for " + mainListenerId + ":" + topic).getSourceDestination();
}
@Nullable
@Override
public DestinationTopic getDltFor(String mainListenerId, String topicName, Exception e) {
DestinationTopic destination = getDltOrNoOpsDestination(mainListenerId, topicName, e);
return destination.isNoOpsTopic()
? null
: destination;
}
private DestinationTopic getDltOrNoOpsDestination(String mainListenerId, String topic, Exception e) {
DestinationTopic destination = getNextDestinationTopicFor(mainListenerId, topic);
return isMatchingDltTopic(destination, e) || destination.isNoOpsTopic() ?
destination :
getDltOrNoOpsDestination(mainListenerId, destination.getDestinationName(), e);
}
private static boolean isMatchingDltTopic(DestinationTopic destination, Exception e) {
if (!destination.isDltTopic()) {
return false;
}
boolean isDltIntendedForCurrentExc = destination.usedForExceptions().stream()
.anyMatch(excType -> isDirectExcOrCause(e, excType));
boolean isGenericPurposeDlt = destination.usedForExceptions().isEmpty();
return isDltIntendedForCurrentExc || isGenericPurposeDlt;
}
private static boolean isDirectExcOrCause(Exception e, Class extends Throwable> excType) {
if (e == null) {
return false;
}
Throwable toMatch = e;
boolean isMatched = excType.isInstance(toMatch);
while (!isMatched) {
toMatch = toMatch.getCause();
if (toMatch == null) {
return false;
}
isMatched = excType.isInstance(toMatch);
}
return isMatched;
}
@Override
public DestinationTopic getNextDestinationTopicFor(String mainListenerId, String topic) {
return getDestinationHolderFor(mainListenerId, topic).getNextDestination();
}
private DestinationTopicHolder getDestinationHolderFor(String mainListenerId, String topic) {
return this.contextRefreshed
? doGetDestinationFor(mainListenerId, topic)
: getDestinationTopicSynchronized(mainListenerId, topic);
}
private DestinationTopicHolder getDestinationTopicSynchronized(String mainListenerId, String topic) {
synchronized (this.sourceDestinationsHolderMap) {
return doGetDestinationFor(mainListenerId, topic);
}
}
private DestinationTopicHolder doGetDestinationFor(String mainListenerId, String topic) {
Map map = this.sourceDestinationsHolderMap.get(mainListenerId);
Assert.notNull(map, () -> "No destination resolution information for listener " + mainListenerId);
return Objects.requireNonNull(map.get(topic),
() -> "No destination found for topic: " + topic);
}
@Override
public void addDestinationTopics(String mainListenerId, List destinationsToAdd) {
if (this.contextRefreshed) {
throw new IllegalStateException("Cannot add new destinations, "
+ DefaultDestinationTopicResolver.class.getSimpleName() + " is already refreshed.");
}
validateDestinations(destinationsToAdd);
synchronized (this.sourceDestinationsHolderMap) {
Map map = this.sourceDestinationsHolderMap.computeIfAbsent(mainListenerId,
id -> new HashMap<>());
map.putAll(correlatePairSourceAndDestinationValues(destinationsToAdd));
}
}
private void validateDestinations(List destinationsToAdd) {
for (int i = 0; i < destinationsToAdd.size(); i++) {
DestinationTopic destination = destinationsToAdd.get(i);
if (destination.isReusableRetryTopic()) {
Assert.isTrue((i == (destinationsToAdd.size() - 1) ||
((i == (destinationsToAdd.size() - 2)) && (destinationsToAdd.get(i + 1).isDltTopic()))),
String.format("In the destination topic chain, the type %s can only be "
+ "specified as the last retry topic.", Type.REUSABLE_RETRY_TOPIC));
}
}
}
private Map correlatePairSourceAndDestinationValues(
List destinationList) {
return IntStream
.range(0, destinationList.size())
.boxed()
.collect(Collectors.toMap(index -> destinationList.get(index).getDestinationName(),
index -> new DestinationTopicHolder(destinationList.get(index),
getNextDestinationTopic(destinationList, index))));
}
private DestinationTopic getNextDestinationTopic(List destinationList, int index) {
return index != destinationList.size() - 1
? destinationList.get(index + 1)
: new DestinationTopic(destinationList.get(index).getDestinationName() + NO_OPS_SUFFIX,
destinationList.get(index), NO_OPS_SUFFIX, DestinationTopic.Type.NO_OPS);
}
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
if (Objects.equals(event.getApplicationContext(), this.applicationContext)) {
this.contextRefreshed = true;
}
}
/**
* Return true if the application context is refreshed.
* @return true if refreshed.
* @since 2.7.8
*/
public boolean isContextRefreshed() {
return this.contextRefreshed;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
public static class DestinationTopicHolder {
private final DestinationTopic sourceDestination;
private final DestinationTopic nextDestination;
DestinationTopicHolder(DestinationTopic sourceDestination, DestinationTopic nextDestination) {
this.sourceDestination = sourceDestination;
this.nextDestination = nextDestination;
}
protected DestinationTopic getNextDestination() {
return this.nextDestination;
}
protected DestinationTopic getSourceDestination() {
return this.sourceDestination;
}
}
}
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