spring-kafka RoutingKafkaTemplate 源码
spring-kafka RoutingKafkaTemplate 代码
文件路径:/spring-kafka/src/main/java/org/springframework/kafka/core/RoutingKafkaTemplate.java
/*
* Copyright 2020-2022 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.core;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.Pattern;
import org.apache.kafka.clients.consumer.ConsumerGroupMetadata;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.common.Metric;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.TopicPartition;
import org.springframework.util.Assert;
/**
* A {@link KafkaTemplate} that routes messages based on the topic name. Does not support
* transactions, {@link #flush()}, {@link #metrics()}, and
* {@link #execute(org.springframework.kafka.core.KafkaOperations.ProducerCallback)},
* only simple send operations.
*
* @author Gary Russell
* @since 2.5
*
*/
public class RoutingKafkaTemplate extends KafkaTemplate<Object, Object> {
private static final String THIS_METHOD_IS_NOT_SUPPORTED = "This method is not supported";
private final Map<Pattern, ProducerFactory<Object, Object>> factoryMatchers;
private final ConcurrentMap<String, ProducerFactory<Object, Object>> factoryMap = new ConcurrentHashMap<>();
/**
* Construct an instance with the provided properties. The topic patterns will be
* traversed in order so an ordered map, such as {@link LinkedHashMap} should be used
* with more specific patterns declared first.
* @param factories the factories.
*/
public RoutingKafkaTemplate(Map<Pattern, ProducerFactory<Object, Object>> factories) {
super(new ProducerFactory<Object, Object>() {
@Override
public Producer<Object, Object> createProducer() {
throw new UnsupportedOperationException();
}
});
this.factoryMatchers = new LinkedHashMap<>(factories);
Optional<Boolean> transactional = factories.values().stream()
.map(fact -> fact.transactionCapable())
.findFirst();
Assert.isTrue(!transactional.isPresent() || !transactional.get(), "Transactional factories are not supported");
}
@Override
public ProducerFactory<Object, Object> getProducerFactory() {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
@Override
public ProducerFactory<Object, Object> getProducerFactory(String topic) {
ProducerFactory<Object, Object> producerFactory = this.factoryMap.computeIfAbsent(topic, key -> {
for (Entry<Pattern, ProducerFactory<Object, Object>> entry : this.factoryMatchers.entrySet()) {
if (entry.getKey().matcher(topic).matches()) {
return entry.getValue();
}
}
return null;
});
Assert.state(producerFactory != null, "No producer factory found for topic: " + topic);
return producerFactory;
}
@Override
public <T> T execute(ProducerCallback<Object, Object, T> callback) {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
@Override
public <T> T executeInTransaction(OperationsCallback<Object, Object, T> callback) {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
@Override
public void sendOffsetsToTransaction(Map<TopicPartition, OffsetAndMetadata> offsets,
ConsumerGroupMetadata groupMetadata) {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
@Override
public Map<MetricName, ? extends Metric> metrics() {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
@Override
public void flush() {
throw new UnsupportedOperationException(THIS_METHOD_IS_NOT_SUPPORTED);
}
}
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