spring-kafka KafkaConsumerBackoffManager 源码
spring-kafka KafkaConsumerBackoffManager 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/KafkaConsumerBackoffManager.java
/*
* Copyright 2018-2021 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.listener;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.common.TopicPartition;
/**
* Interface for backing off a {@link MessageListenerContainer}
* until a given dueTimestamp, if such timestamp is in the future.
*
* @author Tomaz Fernandes
* @author Gary Russell
* @since 2.7
*/
public interface KafkaConsumerBackoffManager {
void backOffIfNecessary(Context context);
default Context createContext(long dueTimestamp, String listenerId, TopicPartition topicPartition,
Consumer<?, ?> messageConsumer) {
return new Context(dueTimestamp, topicPartition, listenerId, messageConsumer);
}
/**
* Provides the state that will be used for backing off.
* @since 2.7
*/
class Context {
/**
* The time after which the message should be processed,
* in milliseconds since epoch.
*/
private final long dueTimestamp;
/**
* The id for the listener that should be paused.
*/
private final String listenerId;
/**
* The topic that contains the partition to be paused.
*/
private final TopicPartition topicPartition;
/**
* The consumer of the message, if present.
*/
private final Consumer<?, ?> consumerForTimingAdjustment;
Context(long dueTimestamp, TopicPartition topicPartition, String listenerId,
Consumer<?, ?> consumerForTimingAdjustment) {
this.dueTimestamp = dueTimestamp;
this.listenerId = listenerId;
this.topicPartition = topicPartition;
this.consumerForTimingAdjustment = consumerForTimingAdjustment;
}
public long getDueTimestamp() {
return this.dueTimestamp;
}
public String getListenerId() {
return this.listenerId;
}
public TopicPartition getTopicPartition() {
return this.topicPartition;
}
public Consumer<?, ?> getConsumerForTimingAdjustment() {
return this.consumerForTimingAdjustment;
}
}
}
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