| /* |
| * 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.catalina.core; |
| |
| import java.io.File; |
| import java.lang.reflect.InvocationTargetException; |
| |
| import javax.naming.NamingException; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import org.junit.Ignore; |
| import org.junit.Test; |
| |
| import org.apache.catalina.Context; |
| import org.apache.catalina.Wrapper; |
| import org.apache.catalina.servlets.DefaultServlet; |
| import org.apache.catalina.startup.Tomcat; |
| import org.apache.catalina.startup.TomcatBaseTest; |
| import org.apache.jasper.servlet.JasperInitializer; |
| import org.apache.tomcat.InstanceManager; |
| |
| |
| public class TestDefaultInstanceManager extends TomcatBaseTest { |
| |
| @Test |
| public void testClassUnloading() throws Exception { |
| |
| DefaultInstanceManager instanceManager = doClassUnloadingPrep(); |
| |
| // Request a JSP page (that doesn't load any tag libraries etc.) |
| // This page does use @PostConstruct to ensure that the cache does not |
| // retain strong references |
| getUrl("http://localhost:" + getPort() + "/test/annotations.jsp"); |
| // Request a second JSP (again, no tag libraries etc.) |
| getUrl("http://localhost:" + getPort() + "/test/bug36923.jsp"); |
| |
| // Check the number of classes in the cache |
| int count = instanceManager.getAnnotationCacheSize(); |
| |
| // Request a third JSP (again, no tag libraries etc.) |
| getUrl("http://localhost:" + getPort() + "/test/bug5nnnn/bug51544.jsp"); |
| |
| // Force a GC to clear out unloaded class (first JSP) |
| System.gc(); |
| |
| // Spin a while until GC happens or we wait too long |
| int loop = 0; |
| while (loop < 10) { |
| instanceManager.backgroundProcess(); |
| if (instanceManager.getAnnotationCacheSize() == count) { |
| break; |
| } |
| Thread.sleep(100); |
| loop++; |
| } |
| |
| // First JSP should be unloaded and replaced by third (second left |
| // alone) so no change in overall count |
| assertEquals(count, instanceManager.getAnnotationCacheSize()); |
| } |
| |
| private DefaultInstanceManager doClassUnloadingPrep() throws Exception { |
| Tomcat tomcat = getTomcatInstance(); |
| |
| // Create the context (don't use addWebapp as we want to modify the |
| // JSP Servlet settings). |
| File appDir = new File("test/webapp"); |
| StandardContext ctxt = (StandardContext) tomcat.addContext( |
| null, "/test", appDir.getAbsolutePath()); |
| |
| ctxt.addServletContainerInitializer(new JasperInitializer(), null); |
| |
| // Configure the defaults and then tweak the JSP servlet settings |
| // Note: Min value for maxLoadedJsps is 2 |
| Tomcat.initWebappDefaults(ctxt); |
| Wrapper w = (Wrapper) ctxt.findChild("jsp"); |
| w.addInitParameter("maxLoadedJsps", "2"); |
| |
| tomcat.start(); |
| |
| return (DefaultInstanceManager) ctxt.getInstanceManager(); |
| } |
| |
| |
| /* |
| * Performance test. Comment out @Ignore to run the test. |
| */ |
| @Ignore |
| @Test |
| public void testConcurrency() throws Exception { |
| // Create a populated InstanceManager |
| Tomcat tomcat = getTomcatInstance(); |
| Context ctx = tomcat.addContext(null, "", null); |
| |
| tomcat.start(); |
| |
| InstanceManager im = ctx.getInstanceManager(); |
| |
| for (int i = 1; i < 9; i++) { |
| doTestConcurrency(im, i); |
| } |
| } |
| |
| |
| private void doTestConcurrency(InstanceManager im, int threadCount) throws Exception { |
| long start = System.nanoTime(); |
| |
| Thread[] threads = new Thread[threadCount]; |
| |
| for (int i = 0; i < threadCount; i++) { |
| threads[i] = new Thread(new InstanceManagerRunnable(im)); |
| } |
| |
| for (int i = 0; i < threadCount; i++) { |
| threads[i].start(); |
| } |
| |
| for (int i = 0; i < threadCount; i++) { |
| threads[i].join(); |
| } |
| |
| long duration = System.nanoTime() - start; |
| |
| System.out.println(threadCount + " threads completed in " + duration + "ns"); |
| } |
| |
| |
| private class InstanceManagerRunnable implements Runnable { |
| |
| private final InstanceManager im; |
| |
| private InstanceManagerRunnable(InstanceManager im) { |
| this.im = im; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| Object test = new DefaultServlet(); |
| for (int i = 0; i < 200000; i++) { |
| im.newInstance(test); |
| im.destroyInstance(test); |
| } |
| } catch (NamingException | IllegalAccessException | InvocationTargetException ne) { |
| ne.printStackTrace(); |
| } |
| } |
| } |
| } |