Add missing file for HADOOP-6413.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@890588 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with 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.hadoop.util;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.HashMap;
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import org.apache.hadoop.conf.Configuration;
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import static org.junit.Assert.*;
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import org.junit.Before;
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import org.junit.Test;
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public class TestReflectionUtils {
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private static Class toConstruct[] = { String.class, TestReflectionUtils.class, HashMap.class };
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private Throwable failure = null;
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@Before
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public void setUp() {
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ReflectionUtils.clearCache();
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}
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@Test
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public void testCache() throws Exception {
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assertEquals(0, cacheSize());
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doTestCache();
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assertEquals(toConstruct.length, cacheSize());
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ReflectionUtils.clearCache();
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assertEquals(0, cacheSize());
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}
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@SuppressWarnings("unchecked")
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private void doTestCache() {
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for (int i=0; i<toConstruct.length; i++) {
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Class cl = toConstruct[i];
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Object x = ReflectionUtils.newInstance(cl, null);
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Object y = ReflectionUtils.newInstance(cl, null);
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assertEquals(cl, x.getClass());
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assertEquals(cl, y.getClass());
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}
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}
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@Test
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public void testThreadSafe() throws Exception {
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Thread[] th = new Thread[32];
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for (int i=0; i<th.length; i++) {
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th[i] = new Thread() {
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public void run() {
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try {
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doTestCache();
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} catch (Throwable t) {
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failure = t;
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}
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}
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};
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th[i].start();
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}
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for (int i=0; i<th.length; i++) {
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th[i].join();
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}
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if (failure != null) {
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failure.printStackTrace();
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fail(failure.getMessage());
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}
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}
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private int cacheSize() throws Exception {
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return ReflectionUtils.getCacheSize();
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}
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@Test
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public void testCantCreate() {
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try {
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ReflectionUtils.newInstance(NoDefaultCtor.class, null);
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fail("invalid call should fail");
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} catch (RuntimeException rte) {
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assertEquals(NoSuchMethodException.class, rte.getCause().getClass());
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}
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}
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@SuppressWarnings("unchecked")
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@Test
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public void testCacheDoesntLeak() throws Exception {
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int iterations=9999; // very fast, but a bit less reliable - bigger numbers force GC
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for (int i=0; i<iterations; i++) {
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URLClassLoader loader = new URLClassLoader(new URL[0], getClass().getClassLoader());
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Class cl = Class.forName("org.apache.hadoop.util.TestReflectionUtils$LoadedInChild", false, loader);
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Object o = ReflectionUtils.newInstance(cl, null);
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assertEquals(cl, o.getClass());
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}
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System.gc();
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assertTrue(cacheSize()+" too big", cacheSize()<iterations);
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}
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private static class LoadedInChild {
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}
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public static class NoDefaultCtor {
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public NoDefaultCtor(int x) {}
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}
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}
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