org.apache.bookkeeper.zookeeper.ExponentialBackoffRetryPolicy Maven / Gradle / Ivy
/*
*
* 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.bookkeeper.zookeeper;
import java.util.Random;
/**
* A retry policy implementation that backoff retries exponentially.
*/
public class ExponentialBackoffRetryPolicy implements RetryPolicy {
private final Random random;
private final int maxRetries;
private final long baseBackoffTime;
public ExponentialBackoffRetryPolicy(long baseBackoffTime, int maxRetries) {
this.maxRetries = maxRetries;
this.baseBackoffTime = baseBackoffTime;
this.random = new Random(System.currentTimeMillis());
}
@Override
public boolean allowRetry(int retryCount, long elapsedRetryTime) {
return retryCount <= maxRetries;
}
@Override
public long nextRetryWaitTime(int retryCount, long elapsedRetryTime) {
return baseBackoffTime * Math.max(1, random.nextInt(Math.max(1, 1 << (retryCount + 1))));
}
}