| /* |
| * 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.geode.benchmark; |
| |
| import static java.lang.Long.max; |
| import static java.lang.Long.min; |
| |
| import java.io.Serializable; |
| import java.util.Objects; |
| import java.util.concurrent.ThreadLocalRandom; |
| import java.util.function.LongConsumer; |
| |
| /** |
| * Describes a range [min, max) in long values between min inclusive and max exclusive. |
| */ |
| public class LongRange implements Serializable { |
| private static final long serialVersionUID = 1L; |
| |
| private final long min; |
| private final long max; |
| |
| public LongRange(long min, long max) { |
| try { |
| if (Math.subtractExact(max, min) <= 0) { |
| throw new IllegalArgumentException(); |
| } |
| } catch (ArithmeticException e) { |
| throw new IllegalArgumentException(e); |
| } |
| |
| this.min = min; |
| this.max = max; |
| } |
| |
| public long getMin() { |
| return min; |
| } |
| |
| public long getMax() { |
| return max; |
| } |
| |
| public long size() { |
| return max - min; |
| } |
| |
| /** |
| * Slices the range in relatively equal ranges in each slice with the remainder distributed across |
| * the slices. |
| * |
| * @param count of slices |
| * @return array of {@code count} slices |
| */ |
| public LongRange[] slice(final int count) { |
| final LongRange[] slices = new LongRange[count]; |
| |
| for (int i = 0; i < slices.length; i++) { |
| slices[i] = sliceFor(count, i); |
| } |
| |
| return slices; |
| } |
| |
| /** |
| * Get a single slice for {@code count} slices at {@code index} |
| * |
| * @param count of slices |
| * @param index of slice |
| * @return Single slice at index. |
| * @throws IndexOutOfBoundsException if index is less than 0 or greater than slices. |
| */ |
| public LongRange sliceFor(final int count, final int index) throws IndexOutOfBoundsException { |
| if (index < 0 || index >= count) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| final long size = max - min; |
| final long increment = size / count; |
| final long remainder = size % count; |
| final long sliceMin = |
| min + ((increment + 1) * min(remainder, index)) + (increment * max(0, index - remainder)); |
| final long sliceMax = sliceMin + increment + (index < remainder ? 1 : 0); |
| return new LongRange(sliceMin, sliceMax); |
| } |
| |
| public LongRange[] slicesOfSize(final long sliceSize) { |
| final int count = (int) Math.ceil((double) size() / sliceSize); |
| return slice(count); |
| } |
| |
| /** |
| * Iterates over each value in the range. |
| * |
| * @param consumer to invoke with current value. |
| */ |
| public void forEach(LongConsumer consumer) { |
| for (long i = min; i < max; i++) { |
| consumer.accept(i); |
| } |
| } |
| |
| /** |
| * Randomly select a value withing range. |
| * |
| * @return a random value within range. |
| */ |
| public long random() { |
| return ThreadLocalRandom.current().nextLong(min, max); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| final LongRange longRange = (LongRange) o; |
| return min == longRange.min && |
| max == longRange.max; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(min, max); |
| } |
| |
| @Override |
| public String toString() { |
| return "LongRange{" + "min=" + min + ", max=" + max + '}'; |
| } |
| } |