142 lines
4.0 KiB
Java
142 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util.buf;
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import java.nio.charset.Charset;
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import java.util.HashMap;
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import java.util.Locale;
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import java.util.Map;
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import org.junit.Test;
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public class TestCharsetCachePerformance {
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@Test
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public void testNoCsCache() throws Exception {
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doTest(new NoCsCache());
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}
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@Test
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public void testFullCsCache() throws Exception {
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doTest(new FullCsCache());
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}
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@Test
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public void testLazyCsCache() throws Exception {
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doTest(new LazyCsCache());
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}
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private void doTest(CsCache cache) throws Exception {
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int threadCount = 10;
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int iterations = 10000000;
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String[] lookupNames = new String[] {
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"ISO-8859-1", "ISO-8859-2", "ISO-8859-3", "ISO-8859-4", "ISO-8859-5" };
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Thread[] threads = new Thread[threadCount];
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for (int i = 0; i < threadCount; i++) {
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threads[i] = new TestCsCacheThread(iterations, cache, lookupNames);
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}
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long startTime = System.nanoTime();
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for (int i = 0; i < threadCount; i++) {
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threads[i].start();
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}
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for (int i = 0; i < threadCount; i++) {
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threads[i].join();
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}
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long endTime = System.nanoTime();
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System.out.println(cache.getClass().getName() + ": " + (endTime - startTime) + "ns");
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}
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private static interface CsCache {
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Charset getCharset(String charsetName);
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}
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private static class NoCsCache implements CsCache {
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@Override
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public Charset getCharset(String charsetName) {
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return Charset.forName(charsetName);
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}
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}
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private static class FullCsCache implements CsCache {
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private static final Map<String,Charset> cache = new HashMap<>();
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static {
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for (Charset charset: Charset.availableCharsets().values()) {
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cache.put(charset.name().toLowerCase(Locale.ENGLISH), charset);
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for (String alias : charset.aliases()) {
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cache.put(alias.toLowerCase(Locale.ENGLISH), charset);
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}
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}
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}
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@Override
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public Charset getCharset(String charsetName) {
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return cache.get(charsetName.toLowerCase(Locale.ENGLISH));
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}
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}
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private static class LazyCsCache implements CsCache {
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private CharsetCache cache = new CharsetCache();
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@Override
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public Charset getCharset(String charsetName) {
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return cache.getCharset(charsetName);
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}
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}
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private static class TestCsCacheThread extends Thread {
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private final int iterations;
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private final CsCache cache;
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private final String[] lookupNames;
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private final int lookupNamesCount;
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public TestCsCacheThread(int iterations, CsCache cache, String[] lookupNames) {
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this.iterations = iterations;
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this.cache = cache;
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this.lookupNames = lookupNames;
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this.lookupNamesCount = lookupNames.length;
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}
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@Override
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public void run() {
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for (int i = 0; i < iterations; i++) {
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cache.getCharset(lookupNames[i % lookupNamesCount]);
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}
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}
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}
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}
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