| /* |
| * 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.BeforeExperiment; |
| import com.google.caliper.Benchmark; |
| import com.google.caliper.Param; |
| |
| import java.util.AbstractList; |
| import java.util.List; |
| |
| /** |
| * Measures iterating through list elements. |
| */ |
| public class ListIterationBenchmark { |
| |
| @Param({"0", "10", "100", "1000"}) |
| private int length; |
| |
| private List<Object> list; |
| private Object[] array; |
| |
| @BeforeExperiment void setUp() { |
| array = new Object[length]; |
| for (int i = 0; i < length; i++) { |
| array[i] = new Object(); |
| } |
| |
| list = new AbstractList<Object>() { |
| @Override public int size() { |
| return length; |
| } |
| |
| @Override public Object get(int i) { |
| return array[i]; |
| } |
| }; |
| } |
| |
| @Benchmark int listIteration(int reps) { |
| int dummy = 0; |
| for (int i = 0; i < reps; i++) { |
| for (Object value : list) { |
| dummy |= value.hashCode(); |
| } |
| } |
| return dummy; |
| } |
| |
| @Benchmark int arrayIteration(int reps) { |
| int dummy = 0; |
| for (int i = 0; i < reps; i++) { |
| for (Object value : array) { |
| dummy |= value.hashCode(); |
| } |
| } |
| return dummy; |
| } |
| } |