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+/*
+ * Copyright (C) 2009 Google Inc.
+ *
+ * Licensed 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 examples;
+
+import com.google.caliper.Param;
+import com.google.caliper.Runner;
+import com.google.caliper.SimpleBenchmark;
+import java.util.Arrays;
+import java.util.Random;
+
+/**
+ * Measures sorting on different distributions of integers.
+ */
+public class ArraySortBenchmark extends SimpleBenchmark {
+
+ @Param({"10", "100", "1000", "10000"}) private int length;
+
+ @Param private Distribution distribution;
+
+ private int[] values;
+ private int[] copy;
+
+ @Override protected void setUp() throws Exception {
+ values = distribution.create(length);
+ copy = new int[length];
+ }
+
+ public void timeSort(int reps) {
+ for (int i = 0; i < reps; i++) {
+ System.arraycopy(values, 0, copy, 0, values.length);
+ Arrays.sort(copy);
+ }
+ }
+
+ public enum Distribution {
+ SAWTOOTH {
+ @Override
+ int[] create(int length) {
+ int[] result = new int[length];
+ for (int i = 0; i < length; i += 5) {
+ result[i] = 0;
+ result[i + 1] = 1;
+ result[i + 2] = 2;
+ result[i + 3] = 3;
+ result[i + 4] = 4;
+ }
+ return result;
+ }
+ },
+ INCREASING {
+ @Override
+ int[] create(int length) {
+ int[] result = new int[length];
+ for (int i = 0; i < length; i++) {
+ result[i] = i;
+ }
+ return result;
+ }
+ },
+ DECREASING {
+ @Override
+ int[] create(int length) {
+ int[] result = new int[length];
+ for (int i = 0; i < length; i++) {
+ result[i] = length - i;
+ }
+ return result;
+ }
+ },
+ RANDOM {
+ @Override
+ int[] create(int length) {
+ Random random = new Random();
+ int[] result = new int[length];
+ for (int i = 0; i < length; i++) {
+ result[i] = random.nextInt();
+ }
+ return result;
+ }
+ };
+
+ abstract int[] create(int length);
+ }
+
+ public static void main(String[] args) throws Exception {
+ Runner.main(ArraySortBenchmark.class, args);
+ }
+}