spring-kafka ExponentialBackOffWithMaxRetries 源码
spring-kafka ExponentialBackOffWithMaxRetries 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/ExponentialBackOffWithMaxRetries.java
/*
* Copyright 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;
import org.springframework.util.backoff.ExponentialBackOff;
/**
* Subclass of {@link ExponentialBackOff} that allows the specification of the maximum
* number of retries rather than the maximum elapsed time.
*
* @author Gary Russell
* @since 2.7.3
*
*/
public class ExponentialBackOffWithMaxRetries extends ExponentialBackOff {
private final int maxRetries;
/**
* Construct an instance that will calculate the {@link #setMaxElapsedTime(long)} from
* the maxRetries.
* @param maxRetries the max retries.
*/
public ExponentialBackOffWithMaxRetries(int maxRetries) {
this.maxRetries = maxRetries;
calculateMaxElapsed();
}
/**
* Get the max retries.
* @return the max retries.
*/
public int getMaxRetries() {
return this.maxRetries;
}
@Override
public void setInitialInterval(long initialInterval) {
super.setInitialInterval(initialInterval);
calculateMaxElapsed();
}
@Override
public void setMultiplier(double multiplier) {
super.setMultiplier(multiplier);
calculateMaxElapsed();
}
@Override
public void setMaxInterval(long maxInterval) {
super.setMaxInterval(maxInterval);
calculateMaxElapsed();
}
@Override
public void setMaxElapsedTime(long maxElapsedTime) {
throw new IllegalStateException("'maxElapsedTime' is calculated from the 'maxRetries' property");
}
private void calculateMaxElapsed() {
long maxInterval = getMaxInterval();
long maxElapsed = Math.min(getInitialInterval(), maxInterval);
long current = maxElapsed;
for (int i = 1; i < this.maxRetries; i++) {
long next = Math.min((long) (current * getMultiplier()), maxInterval);
current = next;
maxElapsed += current;
}
super.setMaxElapsedTime(maxElapsed);
}
}
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