kafka Retry 源码
kafka Retry 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/Retry.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.kafka.common.security.oauthbearer.internals.secured;
import java.util.concurrent.ExecutionException;
import org.apache.kafka.common.utils.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Retry encapsulates the mechanism to perform a retry and then exponential
* backoff using provided wait times between attempts.
*
* @param <R> Result type
*/
public class Retry<R> {
private static final Logger log = LoggerFactory.getLogger(Retry.class);
private final Time time;
private final long retryBackoffMs;
private final long retryBackoffMaxMs;
public Retry(long retryBackoffMs, long retryBackoffMaxMs) {
this(Time.SYSTEM, retryBackoffMs, retryBackoffMaxMs);
}
public Retry(Time time, long retryBackoffMs, long retryBackoffMaxMs) {
this.time = time;
this.retryBackoffMs = retryBackoffMs;
this.retryBackoffMaxMs = retryBackoffMaxMs;
if (this.retryBackoffMs < 0)
throw new IllegalArgumentException(String.format("retryBackoffMs value (%d) must be non-negative", retryBackoffMs));
if (this.retryBackoffMaxMs < 0)
throw new IllegalArgumentException(String.format("retryBackoffMaxMs value (%d) must be non-negative", retryBackoffMaxMs));
if (this.retryBackoffMaxMs < this.retryBackoffMs)
throw new IllegalArgumentException(String.format("retryBackoffMaxMs value (%d) is less than retryBackoffMs value (%d)", retryBackoffMaxMs, retryBackoffMs));
}
public R execute(Retryable<R> retryable) throws ExecutionException {
long endMs = time.milliseconds() + retryBackoffMaxMs;
int currAttempt = 0;
ExecutionException error = null;
while (time.milliseconds() <= endMs) {
currAttempt++;
try {
return retryable.call();
} catch (UnretryableException e) {
// We've deemed this error to not be worth retrying, so collect the error and
// fail immediately.
if (error == null)
error = new ExecutionException(e);
break;
} catch (ExecutionException e) {
log.warn("Error during retry attempt {}", currAttempt, e);
if (error == null)
error = e;
long waitMs = retryBackoffMs * (long) Math.pow(2, currAttempt - 1);
long diff = endMs - time.milliseconds();
waitMs = Math.min(waitMs, diff);
if (waitMs <= 0)
break;
String message = String.format("Attempt %d to make call resulted in an error; sleeping %d ms before retrying",
currAttempt, waitMs);
log.warn(message, e);
time.sleep(waitMs);
}
}
if (error == null)
// Really shouldn't ever get to here, but...
error = new ExecutionException(new IllegalStateException("Exhausted all retry attempts but no attempt returned value or encountered exception"));
throw error;
}
}
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