| /** |
| * 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.pulsar.io.elasticsearch; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import org.opensearch.action.bulk.BackoffPolicy; |
| import org.opensearch.common.unit.TimeValue; |
| |
| public class RandomExponentialBackoffPolicy extends BackoffPolicy { |
| private final RandomExponentialRetry randomExponentialRetry; |
| private final long start; |
| private final int numberOfElements; |
| |
| public RandomExponentialBackoffPolicy(RandomExponentialRetry randomExponentialRetry, |
| long start, int numberOfElements) { |
| this.randomExponentialRetry = randomExponentialRetry; |
| assert start >= 0; |
| assert numberOfElements >= -1; |
| this.start = start; |
| this.numberOfElements = numberOfElements; |
| } |
| |
| public Iterator<TimeValue> iterator() { |
| return new RandomExponentialBackoffIterator(this.start, this.numberOfElements); |
| } |
| |
| class RandomExponentialBackoffIterator implements Iterator<TimeValue> { |
| private final int numberOfElements; |
| private final long start; |
| private int currentlyConsumed; |
| |
| RandomExponentialBackoffIterator(long start, int numberOfElements) { |
| this.start = start; |
| this.numberOfElements = numberOfElements; |
| } |
| |
| public boolean hasNext() { |
| return numberOfElements == -1 || this.currentlyConsumed < this.numberOfElements; |
| } |
| |
| public TimeValue next() { |
| if (!this.hasNext()) { |
| throw new NoSuchElementException("Only up to " + this.numberOfElements + " elements"); |
| } else { |
| long result = RandomExponentialBackoffPolicy.this.randomExponentialRetry |
| .randomWaitInMs(this.currentlyConsumed, start); |
| ++this.currentlyConsumed; |
| return TimeValue.timeValueMillis(result); |
| } |
| } |
| } |
| } |