/*
* 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.commons.collections;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.commons.collections.map.Flat3Map;
/**
* <code>TestMapPerformance</code> is designed to perform basic Map performance tests.
*
* @author Stephen Colebourne
*/
public class MapPerformance {
/** The total number of runs for each test */
private static final int RUNS = 20000000;
/**
* Main method
*/
public static void main(String[] args) {
testAll();
}
private static void testAll() {
Map dummyMap = new DummyMap();
Map hashMap = new HashMap();
// hashMap.put("Alpha", "A");
// hashMap.put("Beta", "B");
// hashMap.put("Gamma", "C");
// hashMap.put("Delta", "D");
Map flatMap = new Flat3Map(hashMap);
System.out.println(flatMap);
Map unmodHashMap = Collections.unmodifiableMap(new HashMap(hashMap));
Map fastHashMap = new FastHashMap(hashMap);
Map treeMap = new TreeMap(hashMap);
Map seqMap = new SequencedHashMap(hashMap);
// Map linkedMap = new LinkedHashMap(hashMap);
// Map syncMap = Collections.unmodifiableMap(new HashMap(hashMap));
// Map bucketMap = new StaticBucketMap();
// bucketMap.putAll(hashMap);
// Map doubleMap = new DoubleOrderedMap(hashMap);
// dummy is required as the VM seems to hotspot the first call to the
// test method with the given type
test(dummyMap, " Dummy ");
test(dummyMap, " Dummy ");
test(dummyMap, " Dummy ");
test(flatMap, " Flat3 ");
test(hashMap, " HashMap ");
test(flatMap, " Flat3 ");
test(flatMap, " Flat3 ");
test(flatMap, " Flat3 ");
test(hashMap, " HashMap ");
test(hashMap, " HashMap ");
test(hashMap, " HashMap ");
// test(treeMap, " TreeMap ");
// test(treeMap, " TreeMap ");
// test(treeMap, " TreeMap ");
// test(unmodHashMap, "Unmod(HashMap) ");
// test(unmodHashMap, "Unmod(HashMap) ");
// test(unmodHashMap, "Unmod(HashMap) ");
//
// test(syncMap, " Sync(HashMap) ");
// test(syncMap, " Sync(HashMap) ");
// test(syncMap, " Sync(HashMap) ");
//
// test(fastHashMap, " FastHashMap ");
// test(fastHashMap, " FastHashMap ");
// test(fastHashMap, " FastHashMap ");
//
// test(seqMap, " SeqHashMap ");
// test(seqMap, " SeqHashMap ");
// test(seqMap, " SeqHashMap ");
//
// test(linkedMap, " LinkedHashMap ");
// test(linkedMap, " LinkedHashMap ");
// test(linkedMap, " LinkedHashMap ");
//
// test(bucketMap, " BucketMap ");
// test(bucketMap, " BucketMap ");
// test(bucketMap, " BucketMap ");
//
// test(doubleMap, " DoubleMap ");
// test(doubleMap, " DoubleMap ");
// test(doubleMap, " DoubleMap ");
}
private static void test(Map map, String name) {
long start = 0, end = 0;
int total = 0;
start = System.currentTimeMillis();
for (int i = RUNS; i > 0; i--) {
// if (map.get("Alpha") != null) total++;
// if (map.get("Beta") != null) total++;
// if (map.get("Gamma") != null) total++;
map.put("Alpha", "A");
map.put("Beta", "B");
map.put("Beta", "C");
map.put("Gamma", "D");
// map.remove("Gamma");
// map.remove("Beta");
// map.remove("Alpha");
map.put("Delta", "E");
map.clear();
}
end = System.currentTimeMillis();
System.out.println(name + (end - start));
}
// ----------------------------------------------------------------------
private static class DummyMap implements Map {
public void clear() {
}
public boolean containsKey(Object key) {
return false;
}
public boolean containsValue(Object value) {
return false;
}
public Set entrySet() {
return null;
}
public Object get(Object key) {
return null;
}
public boolean isEmpty() {
return false;
}
public Set keySet() {
return null;
}
public Object put(Object key, Object value) {
return null;
}
public void putAll(Map t) {
}
public Object remove(Object key) {
return null;
}
public int size() {
return 0;
}
public Collection values() {
return null;
}
}
}