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.VirtualMachine; 38 import com.sun.jdi.VMDisconnectedException; 39 40 /** 41 * Our repository of what we know about the state of one 42 * running VM. 43 */ 44 class Session { 45 46 final VirtualMachine vm; 47 final ExecutionManager runtime; 48 final OutputListener diagnostics; 49 50 boolean running = true; // Set false by JDIEventSource 51 boolean interrupted = false; // Set false by JDIEventSource 52 53 private JDIEventSource eventSourceThread = null; 54 private int traceFlags; 55 private boolean dead = false; 56 57 public Session(VirtualMachine vm, ExecutionManager runtime, 58 OutputListener diagnostics) { 59 this.vm = vm; 60 this.runtime = runtime; 61 this.diagnostics = diagnostics; 62 this.traceFlags = VirtualMachine.TRACE_NONE; 63 } 64 65 /** 66 * Determine if VM is interrupted, i.e, present and not running. 67 */ 68 public boolean isInterrupted() { 69 return interrupted; 70 } 71 72 public void setTraceMode(int traceFlags) { 73 this.traceFlags = traceFlags; 74 if (!dead) { 75 vm.setDebugTraceMode(traceFlags); 76 } 77 } 78 79 public boolean attach() { 80 vm.setDebugTraceMode(traceFlags); 81 diagnostics.putString("Connected to VM"); 82 eventSourceThread = new JDIEventSource(this); 83 eventSourceThread.start(); 84 return true; 85 } 86 87 public void detach() { 88 if (!dead) { 89 eventSourceThread.interrupt(); 90 eventSourceThread = null; 91 //### The VM may already be disconnected 92 //### if the debuggee did a System.exit(). 93 //### Exception handler here is a kludge, 94 //### Rather, there are many other places 95 //### where we need to handle this exception, 96 //### and initiate a detach due to an error 97 //### condition, e.g., connection failure. 98 try { 99 vm.dispose(); 100 } catch (VMDisconnectedException ee) {} 101 dead = true; 102 diagnostics.putString("Disconnected from VM"); 103 } 104 } 105 }