1 /* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 4882798 27 * @summary multi-thread test to exercise sync and contention for removes to transformer registry 28 * @author Gabriel Adauto, Wily Technology 29 * 30 * @modules java.instrument 31 * @run build TransformerManagementThreadRemoveTests 32 * @run shell MakeJAR.sh redefineAgent 33 * @run main/othervm -javaagent:redefineAgent.jar TransformerManagementThreadRemoveTests TransformerManagementThreadRemoveTests 34 */ 35 import java.util.*; 36 37 public class TransformerManagementThreadRemoveTests 38 extends TransformerManagementThreadAddTests 39 { 40 41 /** 42 * Constructor for TransformerManagementThreadRemoveTests. 43 * @param name 44 */ 45 public TransformerManagementThreadRemoveTests(String name) 46 { 47 super(name); 48 } 49 50 public static void 51 main (String[] args) 52 throws Throwable { 53 ATestCaseScaffold test = new TransformerManagementThreadRemoveTests(args[0]); 54 test.runTest(); 55 } 56 57 protected final void 58 doRunTest() 59 throws Throwable { 60 testMultiThreadAddsAndRemoves(); 61 } 62 63 public void 64 testMultiThreadAddsAndRemoves() 65 { 66 int size = TOTAL_THREADS + REMOVE_THREADS; 67 ArrayList threadList = new ArrayList(size); 68 for (int i = MIN_TRANS; i <= MAX_TRANS; i++) 69 { 70 int index = i - MIN_TRANS; 71 threadList.add(new TransformerThread("Trans"+prettyNum(index,2), i)); 72 } 73 74 int factor = (int)Math.floor(TOTAL_THREADS / REMOVE_THREADS); 75 for (int i = 0; i < REMOVE_THREADS; i++) 76 { 77 threadList.add(factor * i, new RemoveThread("Remove"+i)); 78 } 79 80 Thread[] threads = (Thread[])threadList.toArray(new Thread[size]); 81 setExecThread(new ExecuteTransformersThread()); 82 getExecThread().start(); 83 for (int i = threads.length - 1; i >= 0; i--) 84 { 85 threads[i].start(); 86 } 87 88 while (!testCompleted()) 89 { 90 // Effective Java - Item 51: Don't depend on the thread scheduler 91 // Use sleep() instead of yield(). 92 try { 93 Thread.sleep(500); 94 } catch (InterruptedException ie) { 95 } 96 } 97 assertTrue(finalCheck()); 98 99 //printTransformers(); 100 } 101 102 /** 103 * Method removeTransformer. 104 */ 105 private void 106 removeTransformer(Thread t) 107 { 108 ThreadTransformer tt = null; 109 110 synchronized (fAddedTransformers) 111 { 112 int size = fAddedTransformers.size(); 113 if (size > 0) 114 { 115 int choose = (int)Math.floor(Math.random() * size); 116 tt = (ThreadTransformer)fAddedTransformers.remove(choose); 117 } 118 //System.out.println("removed("+tt+") size("+size+") chose("+choose+") by("+t+")"); 119 } 120 121 if (tt != null) 122 { 123 getInstrumentation().removeTransformer(tt); 124 } 125 } 126 127 private class 128 RemoveThread 129 extends Thread 130 { 131 132 RemoveThread(String name) 133 { 134 super(name); 135 } 136 137 public void 138 run() 139 { 140 while (!threadsDone()) 141 { 142 removeTransformer(RemoveThread.this); 143 } 144 } 145 } 146 147 }