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51 changes: 51 additions & 0 deletions
51
solr/benchmark/src/java/org/apache/solr/bench/CircularIterator.java
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| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * 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.solr.bench; | ||
|
|
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| import java.util.Collection; | ||
| import java.util.Iterator; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
|
|
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| public class CircularIterator<T> implements Iterator<T> { | ||
|
|
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| private final Object[] collection; | ||
| private final AtomicInteger idx; | ||
|
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| public CircularIterator(Collection<T> collection) { | ||
| this.collection = Objects.requireNonNull(collection).toArray(); | ||
| if (this.collection.length == 0) { | ||
| throw new IllegalArgumentException("This iterator doesn't support empty collections"); | ||
| } | ||
| this.idx = new AtomicInteger(); | ||
| } | ||
|
|
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| @Override | ||
| public boolean hasNext() { | ||
| return true; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| @Override | ||
| public T next() { | ||
| return (T) collection[idx.incrementAndGet() % collection.length]; | ||
| } | ||
|
|
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| public int cycles() { | ||
| return ((idx.get() - 1) / collection.length) + 1; | ||
| } | ||
| } |
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