| /* |
| * 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.loader; |
| |
| import java.io.IOException; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.junit.Assert; |
| |
| import org.junit.Test; |
| |
| import org.apache.catalina.Context; |
| import org.apache.catalina.core.StandardContext; |
| import org.apache.catalina.startup.Tomcat; |
| import org.apache.catalina.startup.TomcatBaseTest; |
| |
| public class TestWebappClassLoaderExecutorMemoryLeak extends TomcatBaseTest { |
| |
| @Test |
| public void testTimerThreadLeak() throws Exception { |
| Tomcat tomcat = getTomcatInstance(); |
| |
| // Must have a real docBase - just use temp |
| Context ctx = tomcat.addContext("", |
| System.getProperty("java.io.tmpdir")); |
| |
| if (ctx instanceof StandardContext) { |
| ((StandardContext) ctx).setClearReferencesStopThreads(true); |
| } |
| |
| ExecutorServlet executorServlet = new ExecutorServlet(); |
| Tomcat.addServlet(ctx, "taskServlet", executorServlet); |
| ctx.addServletMapping("/", "taskServlet"); |
| |
| tomcat.start(); |
| |
| // This will trigger the timer & thread creation |
| getUrl("http://localhost:" + getPort() + "/"); |
| |
| // Stop the context |
| ctx.stop(); |
| |
| // Should be shutdown once the stop() method above exists |
| Assert.assertTrue(executorServlet.tpe.isShutdown()); |
| |
| // The time taken to shutdown the executor can vary between systems. Try |
| // to avoid false test failures due to timing issues. Give the executor |
| // upto 10 seconds to close down. |
| int count = 0; |
| while (count < 100 && !executorServlet.tpe.isTerminated()) { |
| count++; |
| Thread.sleep(100); |
| } |
| |
| // If the executor has not terminated, there is a thread/memory leak |
| Assert.assertTrue(executorServlet.tpe.isTerminated()); |
| } |
| |
| static class ExecutorServlet extends HttpServlet { |
| |
| private static final long serialVersionUID = 1L; |
| |
| int nTasks = 5; |
| long n = 1000L; |
| int tpSize = 10; |
| |
| public volatile ThreadPoolExecutor tpe; |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) |
| throws ServletException, IOException { |
| |
| resp.getWriter().println( |
| "The current thread served " + this + " servlet"); |
| tpe = new ThreadPoolExecutor(tpSize, tpSize, 50000L, |
| TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>()); |
| |
| Task[] tasks = new Task[nTasks]; |
| for (int i = 0; i < nTasks; i++) { |
| tasks[i] = new Task("Task " + i); |
| tpe.execute(tasks[i]); |
| } |
| resp.getWriter().println("Started " + nTasks + |
| " never ending tasks using the ThreadPoolExecutor"); |
| resp.getWriter().flush(); |
| } |
| |
| class Task implements Runnable { |
| |
| String _id; |
| |
| public Task(String id) { |
| this._id = id; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| while (!Thread.currentThread().isInterrupted()) { |
| Thread.sleep(20000); |
| System.out.println(Thread.currentThread().getClass() |
| + " [" + Thread.currentThread().getName() |
| + "] executing " + this._id); |
| } |
| } catch (InterruptedException e) { |
| System.out.println(Thread.currentThread().getClass() + " [" |
| + Thread.currentThread().getName() + "] EXITING"); |
| } |
| } |
| } |
| } |
| } |