test that shows Ant 1.8.0's findClass to take 10x the time of Ant 1.7.1's version

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@918979 13f79535-47bb-0310-9956-ffa450edef68

src/tests/junit/org/apache/tools/ant/AntClassLoaderPerformance.java

@@ -0,0 +1,55 @@
+/*
+ *  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.tools.ant;
+
+import java.io.File;
+import junit.framework.TestCase;
+import org.apache.tools.ant.types.Path;
+import org.apache.tools.ant.util.FileUtils;
+
+/**
+ * Used to verify the performance effect of classloader changes.
+ */
+public class AntClassLoaderPerformance extends TestCase {
+
+    public void testFindClass() throws Exception {
+        String testCaseURL = getClass()
+            .getClassLoader().getResource("junit/framework/TestCase.class")
+            .toExternalForm();
+        int pling = testCaseURL.indexOf('!');
+        String jarName = testCaseURL.substring(4, pling);
+        File f = new File(FileUtils.getFileUtils().fromURI(jarName));
+        Path p = new Path(null);
+        p.createPathElement().setLocation(f);
+        AntClassLoader al = null;
+        for (int i = 0; i < 1000; i++) {
+            try {
+                // not using factory method so the test can run on Ant
+                // 1.7.1 as well
+                al = new AntClassLoader(null, null, p, false);
+                al.findClass("junit.framework.TestCase");
+            } finally {
+                if (al != null) {
+                    al.cleanup();
+                }
+            }
+        }
+    }
+
+}