spring-kafka AbstractDelegatingMessageListenerAdapter 源码
spring-kafka AbstractDelegatingMessageListenerAdapter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/AbstractDelegatingMessageListenerAdapter.java
/*
* Copyright 2016-2019 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.listener.adapter;
import java.util.Collection;
import java.util.Map;
import org.apache.commons.logging.LogFactory;
import org.apache.kafka.common.TopicPartition;
import org.springframework.core.log.LogAccessor;
import org.springframework.kafka.listener.ConsumerSeekAware;
import org.springframework.kafka.listener.DelegatingMessageListener;
import org.springframework.kafka.listener.ListenerType;
import org.springframework.kafka.listener.ListenerUtils;
/**
* Top level class for all listener adapters.
*
* @param <T> the delegate type.
*
* @author Gary Russell
* @since 1.1
*
*/
public abstract class AbstractDelegatingMessageListenerAdapter<T>
implements ConsumerSeekAware, DelegatingMessageListener<T> {
protected final LogAccessor logger = new LogAccessor(LogFactory.getLog(this.getClass())); // NOSONAR
protected final T delegate; //NOSONAR
protected final ListenerType delegateType; // NOSONAR
private final ConsumerSeekAware seekAware;
public AbstractDelegatingMessageListenerAdapter(T delegate) {
this.delegate = delegate;
this.delegateType = ListenerUtils.determineListenerType(delegate);
if (delegate instanceof ConsumerSeekAware) {
this.seekAware = (ConsumerSeekAware) delegate;
}
else {
this.seekAware = null;
}
}
@Override
public T getDelegate() {
return this.delegate;
}
@Override
public void registerSeekCallback(ConsumerSeekCallback callback) {
if (this.seekAware != null) {
this.seekAware.registerSeekCallback(callback);
}
}
@Override
public void onPartitionsAssigned(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {
if (this.seekAware != null) {
this.seekAware.onPartitionsAssigned(assignments, callback);
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
if (this.seekAware != null) {
this.seekAware.onPartitionsRevoked(partitions);
}
}
@Override
public void onIdleContainer(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {
if (this.seekAware != null) {
this.seekAware.onIdleContainer(assignments, callback);
}
}
}
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