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@@ -0,0 +1,91 @@
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+package org.apache.hadoop.util;
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+
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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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+
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+import junit.framework.TestCase;
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+
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+public class TestReflectionUtils extends TestCase {
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+
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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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+
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+ public void setUp() {
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+ ReflectionUtils.clearCache();
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+ }
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+
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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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+
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+
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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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+
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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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+
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+ private int cacheSize() throws Exception {
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+ return ReflectionUtils.getCacheSize();
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+ }
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+
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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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+
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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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+
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+ private static class LoadedInChild {
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+ }
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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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