spring-kafka DelegatingByTopicSerializer 源码
spring-kafka DelegatingByTopicSerializer 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/serializer/DelegatingByTopicSerializer.java
/*
* Copyright 2019-2022 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.support.serializer;
import java.util.Map;
import java.util.regex.Pattern;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.serialization.Serializer;
/**
* A {@link Serializer} that delegates to other serializers based on a topic pattern.
*
* @author Gary Russell
* @since 2.8
*
*/
public class DelegatingByTopicSerializer extends DelegatingByTopicSerialization<Serializer<?>>
implements Serializer<Object> {
/**
* Construct an instance that will be configured in {@link #configure(Map, boolean)}
* with producer properties {@link #VALUE_SERIALIZATION_TOPIC_CONFIG} and
* {@link #KEY_SERIALIZATION_TOPIC_CONFIG}.
*/
public DelegatingByTopicSerializer() {
}
/**
* Construct an instance with the supplied mapping of topic patterns to delegate
* serializers.
* @param delegates the map of delegates.
* @param defaultDelegate the default to use when no topic name match.
*/
public DelegatingByTopicSerializer(Map<Pattern, Serializer<?>> delegates, Serializer<?> defaultDelegate) {
super(delegates, defaultDelegate);
}
@Override
public void configure(Map<String, ?> configs, boolean isKey) {
super.configure(configs, isKey);
}
@Override
protected Serializer<?> configureDelegate(Map<String, ?> configs, boolean isKey, Serializer<?> delegate) {
delegate.configure(configs, isKey);
return delegate;
}
@Override
protected boolean isInstance(Object instance) {
return instance instanceof Serializer;
}
@Override
public byte[] serialize(String topic, Object data) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override
public byte[] serialize(String topic, Headers headers, Object data) {
if (data == null) {
return null;
}
return ((Serializer<Object>) findDelegate(topic)).serialize(topic, headers, data);
}
}
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