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AbstractKafkaBackOffManagerFactory.java
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AbstractKafkaBackOffManagerFactory.java
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/*
* Copyright 2018-2022 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.listener;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.kafka.config.KafkaListenerConfigUtils;
import org.springframework.util.Assert;
/**
* Base class for {@link KafkaBackOffManagerFactory} implementations.
*
* @author Tomaz Fernandes
* @author Gary Russell
* @since 2.7
* @see KafkaConsumerBackoffManager
*/
public abstract class AbstractKafkaBackOffManagerFactory
implements KafkaBackOffManagerFactory, ApplicationContextAware {
private ApplicationContext applicationContext;
private ListenerContainerRegistry listenerContainerRegistry;
/**
* Creates an instance that will retrieve the {@link ListenerContainerRegistry} from
* the {@link ApplicationContext}.
*/
public AbstractKafkaBackOffManagerFactory() {
this.listenerContainerRegistry = null;
}
/**
* Creates an instance with the provided {@link ListenerContainerRegistry},
* which will be used to fetch the {@link MessageListenerContainer} to back off.
* @param listenerContainerRegistry the listenerContainerRegistry to use.
*/
public AbstractKafkaBackOffManagerFactory(ListenerContainerRegistry listenerContainerRegistry) {
this.listenerContainerRegistry = listenerContainerRegistry;
}
/**
* Sets the {@link ListenerContainerRegistry}, that will be used to fetch the
* {@link MessageListenerContainer} to back off.
*
* @param listenerContainerRegistry the listenerContainerRegistry to use.
*/
public void setListenerContainerRegistry(ListenerContainerRegistry listenerContainerRegistry) {
this.listenerContainerRegistry = listenerContainerRegistry;
}
@Override
public KafkaConsumerBackoffManager create() {
return doCreateManager(getListenerContainerRegistry());
}
protected abstract KafkaConsumerBackoffManager doCreateManager(ListenerContainerRegistry registry);
protected ListenerContainerRegistry getListenerContainerRegistry() {
return this.listenerContainerRegistry != null
? this.listenerContainerRegistry
: getListenerContainerFromContext();
}
private ListenerContainerRegistry getListenerContainerFromContext() {
Assert.notNull(this.applicationContext, "ApplicationContext not set.");
return this.applicationContext.getBean(KafkaListenerConfigUtils.KAFKA_LISTENER_ENDPOINT_REGISTRY_BEAN_NAME,
ListenerContainerRegistry.class);
}
protected <T> T getBean(String beanName, Class<T> beanClass) {
return this.applicationContext.getBean(beanName, beanClass);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
}