spring-kafka DelegatingByTopicDeserializer 源码
spring-kafka DelegatingByTopicDeserializer 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/serializer/DelegatingByTopicDeserializer.java
/*
* Copyright 2019-2021 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.Deserializer;
/**
* A {@link Deserializer} that delegates to other deserializers based on the topic name.
*
* @author Gary Russell
* @since 2.8
*
*/
public class DelegatingByTopicDeserializer extends DelegatingByTopicSerialization<Deserializer<?>>
implements Deserializer<Object> {
/**
* Construct an instance that will be configured in {@link #configure(Map, boolean)}
* with consumer properties.
*/
public DelegatingByTopicDeserializer() {
}
/**
* Construct an instance with the supplied mapping of topic name patterns to delegate
* deserializers.
* @param delegates the map of delegates.
* @param defaultDelegate the default to use when no topic name match.
*/
public DelegatingByTopicDeserializer(Map<Pattern, Deserializer<?>> delegates, Deserializer<?> defaultDelegate) {
super(delegates, defaultDelegate);
}
@Override
public void configure(Map<String, ?> configs, boolean isKey) {
super.configure(configs, isKey);
}
@Override
protected Deserializer<?> configureDelegate(Map<String, ?> configs, boolean isKey, Deserializer<?> delegate) {
delegate.configure(configs, isKey);
return delegate;
}
@Override
protected boolean isInstance(Object delegate) {
return delegate instanceof Deserializer;
}
@Override
public Object deserialize(String topic, byte[] data) {
throw new UnsupportedOperationException();
}
@Override
public Object deserialize(String topic, Headers headers, byte[] data) {
return findDelegate(topic).deserialize(topic, headers, data);
}
}
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