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/*
* Copyright (C) 2012 The Guava Authors
*
* 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 com.google.common.collect;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import java.util.List;
/**
* Benchmark for various ways to create an {@code ImmutableList}.
*
* @author Louis Wasserman
*/
public class ImmutableListCreationBenchmark extends SimpleBenchmark {
@Param({"10", "1000", "1000000"})
int size;
private static final Object OBJECT = new Object();
public int timeBuilderAdd(int reps) {
int size = this.size;
int dummy = 0;
for (int rep = 0; rep < reps; rep++) {
ImmutableList.Builder<Object> builder = ImmutableList.builder();
for (int i = 0; i < size; i++) {
builder.add(OBJECT);
}
dummy += builder.build().size();
}
return dummy;
}
public int timePreSizedBuilderAdd(int reps) {
int size = this.size;
int dummy = 0;
for (int rep = 0; rep < reps; rep++) {
ImmutableList.Builder<Object> builder = new ImmutableList.Builder<Object>(size);
for (int i = 0; i < size; i++) {
builder.add(OBJECT);
}
dummy += builder.build().size();
}
return dummy;
}
public int timeCopyArrayList(int reps) {
int size = this.size;
int dummy = 0;
for (int rep = 0; rep < reps; rep++) {
List<Object> builder = Lists.newArrayList();
for (int i = 0; i < size; i++) {
builder.add(OBJECT);
}
dummy += ImmutableList.copyOf(builder).size();
}
return dummy;
}
public int timeCopyPreSizedArrayList(int reps) {
int size = this.size;
int tmp = 0;
for (int rep = 0; rep < reps; rep++) {
List<Object> builder = Lists.newArrayListWithCapacity(size);
for (int i = 0; i < size; i++) {
builder.add(OBJECT);
}
tmp += ImmutableList.copyOf(builder).size();
}
return tmp;
}
public static void main(String[] args) {
Runner.main(ImmutableListCreationBenchmark.class, args);
}
}
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