Author: tomwhite
Date: Tue Dec 15 00:51:07 2009
New Revision: 890588
URL: http://svn.apache.org/viewvc?rev=890588&view=rev
Log:
Add missing file for HADOOP-6413.
Added:
hadoop/common/trunk/src/test/core/org/apache/hadoop/util/TestReflectionUtils.java
Added:
hadoop/common/trunk/src/test/core/org/apache/hadoop/util/TestReflectionUtils.java
URL:
http://svn.apache.org/viewvc/hadoop/common/trunk/src/test/core/org/apache/hadoop/util/TestReflectionUtils.java?rev=890588&view=auto
==============================================================================
---
hadoop/common/trunk/src/test/core/org/apache/hadoop/util/TestReflectionUtils.java
(added)
+++
hadoop/common/trunk/src/test/core/org/apache/hadoop/util/TestReflectionUtils.java
Tue Dec 15 00:51:07 2009
@@ -0,0 +1,120 @@
+/**
+ * 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.hadoop.util;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.HashMap;
+
+import org.apache.hadoop.conf.Configuration;
+
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestReflectionUtils {
+
+ private static Class toConstruct[] = { String.class,
TestReflectionUtils.class, HashMap.class };
+ private Throwable failure = null;
+
+ @Before
+ public void setUp() {
+ ReflectionUtils.clearCache();
+ }
+
+ @Test
+ public void testCache() throws Exception {
+ assertEquals(0, cacheSize());
+ doTestCache();
+ assertEquals(toConstruct.length, cacheSize());
+ ReflectionUtils.clearCache();
+ assertEquals(0, cacheSize());
+ }
+
+
+ @SuppressWarnings("unchecked")
+ private void doTestCache() {
+ for (int i=0; i<toConstruct.length; i++) {
+ Class cl = toConstruct[i];
+ Object x = ReflectionUtils.newInstance(cl, null);
+ Object y = ReflectionUtils.newInstance(cl, null);
+ assertEquals(cl, x.getClass());
+ assertEquals(cl, y.getClass());
+ }
+ }
+
+ @Test
+ public void testThreadSafe() throws Exception {
+ Thread[] th = new Thread[32];
+ for (int i=0; i<th.length; i++) {
+ th[i] = new Thread() {
+ public void run() {
+ try {
+ doTestCache();
+ } catch (Throwable t) {
+ failure = t;
+ }
+ }
+ };
+ th[i].start();
+ }
+ for (int i=0; i<th.length; i++) {
+ th[i].join();
+ }
+ if (failure != null) {
+ failure.printStackTrace();
+ fail(failure.getMessage());
+ }
+ }
+
+ private int cacheSize() throws Exception {
+ return ReflectionUtils.getCacheSize();
+ }
+
+ @Test
+ public void testCantCreate() {
+ try {
+ ReflectionUtils.newInstance(NoDefaultCtor.class, null);
+ fail("invalid call should fail");
+ } catch (RuntimeException rte) {
+ assertEquals(NoSuchMethodException.class, rte.getCause().getClass());
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ @Test
+ public void testCacheDoesntLeak() throws Exception {
+ int iterations=9999; // very fast, but a bit less reliable - bigger
numbers force GC
+ for (int i=0; i<iterations; i++) {
+ URLClassLoader loader = new URLClassLoader(new URL[0],
getClass().getClassLoader());
+ Class cl =
Class.forName("org.apache.hadoop.util.TestReflectionUtils$LoadedInChild",
false, loader);
+ Object o = ReflectionUtils.newInstance(cl, null);
+ assertEquals(cl, o.getClass());
+ }
+ System.gc();
+ assertTrue(cacheSize()+" too big", cacheSize()<iterations);
+ }
+
+ private static class LoadedInChild {
+ }
+
+ public static class NoDefaultCtor {
+ public NoDefaultCtor(int x) {}
+ }
+}
