1 /* 2 * Copyright (c) 1998, 2011, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * This source code is provided to illustrate the usage of a given feature 28 * or technique and has been deliberately simplified. Additional steps 29 * required for a production-quality application, such as security checks, 30 * input validation and proper error handling, might not be present in 31 * this sample code. 32 */ 33 34 35 package com.sun.tools.example.debug.bdi; 36 37 import com.sun.jdi.*; 38 39 //### Should handle target VM death or connection failure cleanly. 40 41 public class ThreadInfo { 42 43 private ThreadReference thread; 44 private int status; 45 46 private int frameCount; 47 48 Object userObject; // User-supplied annotation. 49 50 private boolean interrupted = false; 51 52 private void assureInterrupted() throws VMNotInterruptedException { 53 if (!interrupted) { 54 throw new VMNotInterruptedException(); 55 } 56 } 57 58 ThreadInfo (ThreadReference thread) { 59 this.thread = thread; 60 this.frameCount = -1; 61 } 62 63 public ThreadReference thread() { 64 return thread; 65 } 66 67 public int getStatus() throws VMNotInterruptedException { 68 assureInterrupted(); 69 update(); 70 return status; 71 } 72 73 public int getFrameCount() throws VMNotInterruptedException { 74 assureInterrupted(); 75 update(); 76 return frameCount; 77 } 78 79 public StackFrame getFrame(int index) throws VMNotInterruptedException { 80 assureInterrupted(); 81 update(); 82 try { 83 return thread.frame(index); 84 } catch (IncompatibleThreadStateException e) { 85 // Should not happen 86 interrupted = false; 87 throw new VMNotInterruptedException(); 88 } 89 } 90 91 public Object getUserObject() { 92 return userObject; 93 } 94 95 public void setUserObject(Object obj) { 96 userObject = obj; 97 } 98 99 // Refresh upon first access after cache is cleared. 100 101 void update() throws VMNotInterruptedException { 102 if (frameCount == -1) { 103 try { 104 status = thread.status(); 105 frameCount = thread.frameCount(); 106 } catch (IncompatibleThreadStateException e) { 107 // Should not happen 108 interrupted = false; 109 throw new VMNotInterruptedException(); 110 } 111 } 112 } 113 114 // Called from 'ExecutionManager'. 115 116 void validate() { 117 interrupted = true; 118 } 119 120 void invalidate() { 121 interrupted = false; 122 frameCount = -1; 123 status = ThreadReference.THREAD_STATUS_UNKNOWN; 124 } 125 126 }