| /* |
| * Copyright (c) 2012 SAP SE. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test FieldMonitor.java |
| * @bug 7158988 |
| * @key regression |
| * @summary verify jvm does not crash while debugging |
| * @run compile TestPostFieldModification.java |
| * @run main/othervm FieldMonitor |
| * @author axel.siebenborn@sap.com |
| */ |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import com.sun.jdi.Bootstrap; |
| import com.sun.jdi.Field; |
| import com.sun.jdi.ReferenceType; |
| import com.sun.jdi.VirtualMachine; |
| import com.sun.jdi.connect.Connector; |
| import com.sun.jdi.connect.IllegalConnectorArgumentsException; |
| import com.sun.jdi.connect.LaunchingConnector; |
| import com.sun.jdi.connect.VMStartException; |
| import com.sun.jdi.event.ClassPrepareEvent; |
| import com.sun.jdi.event.Event; |
| import com.sun.jdi.event.EventQueue; |
| import com.sun.jdi.event.EventSet; |
| import com.sun.jdi.event.ModificationWatchpointEvent; |
| import com.sun.jdi.event.VMDeathEvent; |
| import com.sun.jdi.event.VMStartEvent; |
| import com.sun.jdi.event.VMDisconnectEvent; |
| import com.sun.jdi.request.ClassPrepareRequest; |
| import com.sun.jdi.request.EventRequest; |
| import com.sun.jdi.request.EventRequestManager; |
| import com.sun.jdi.request.ModificationWatchpointRequest; |
| |
| public class FieldMonitor { |
| |
| public static final String CLASS_NAME = "TestPostFieldModification"; |
| public static final String FIELD_NAME = "value"; |
| public static final String ARGUMENTS = "-Xshare:off -Xlog:gc"; |
| |
| public static void main(String[] args) |
| throws IOException, InterruptedException { |
| |
| //VirtualMachine vm = launchTarget(sb.toString()); |
| VirtualMachine vm = launchTarget(CLASS_NAME); |
| |
| System.out.println("Vm launched"); |
| |
| // process events |
| EventQueue eventQueue = vm.eventQueue(); |
| // resume the vm |
| |
| Process process = vm.process(); |
| |
| |
| // Copy target's output and error to our output and error. |
| Thread outThread = new StreamRedirectThread("out reader", process.getInputStream()); |
| Thread errThread = new StreamRedirectThread("error reader", process.getErrorStream()); |
| |
| errThread.start(); |
| outThread.start(); |
| |
| boolean connected = true; |
| int watched = 0; |
| while (connected) { |
| try { |
| EventSet eventSet = eventQueue.remove(); |
| for (Event event : eventSet) { |
| System.out.println("FieldMonitor-main receives: "+event); |
| if (event instanceof VMStartEvent) { |
| addClassWatch(vm); |
| } else if (event instanceof VMDeathEvent |
| || event instanceof VMDisconnectEvent) { |
| // exit |
| connected = false; |
| } else if (event instanceof ClassPrepareEvent) { |
| // watch field on loaded class |
| System.out.println("ClassPrepareEvent"); |
| ClassPrepareEvent classPrepEvent = (ClassPrepareEvent) event; |
| ReferenceType refType = classPrepEvent |
| .referenceType(); |
| addFieldWatch(vm, refType); |
| } else if (event instanceof ModificationWatchpointEvent) { |
| watched++; |
| System.out.println("sleep for 500 ms"); |
| Thread.sleep(500); |
| |
| ModificationWatchpointEvent modEvent = (ModificationWatchpointEvent) event; |
| System.out.println("old=" |
| + modEvent.valueCurrent()); |
| System.out.println("new=" + modEvent.valueToBe()); |
| } |
| } |
| System.out.println("resume..."); |
| eventSet.resume(); |
| } catch (com.sun.jdi.VMDisconnectedException exc) { |
| // Guess this means it's not connected anymore, |
| // sometimes this happens and everything else hangs, just return. |
| return; |
| } |
| } |
| // Shutdown begins when event thread terminates |
| try { |
| errThread.join(); // Make sure output is forwarded |
| outThread.join(); |
| } catch (InterruptedException exc) { |
| // we don't interrupt |
| } |
| |
| if (watched != 11) { // init + 10 modifications in TestPostFieldModification class |
| throw new Error("Expected to receive 11 times ModificationWatchpointEvent, but got "+watched); |
| } |
| } |
| |
| /** |
| * Find a com.sun.jdi.CommandLineLaunch connector |
| */ |
| static LaunchingConnector findLaunchingConnector() { |
| List <Connector> connectors = Bootstrap.virtualMachineManager().allConnectors(); |
| Iterator <Connector> iter = connectors.iterator(); |
| while (iter.hasNext()) { |
| Connector connector = iter.next(); |
| if (connector.name().equals("com.sun.jdi.CommandLineLaunch")) { |
| return (LaunchingConnector)connector; |
| } |
| } |
| throw new Error("No launching connector"); |
| } |
| /** |
| * Return the launching connector's arguments. |
| */ |
| static Map <String,Connector.Argument> connectorArguments(LaunchingConnector connector, String mainArgs) { |
| Map<String,Connector.Argument> arguments = connector.defaultArguments(); |
| for (String key : arguments.keySet()) { |
| System.out.println(key); |
| } |
| |
| Connector.Argument mainArg = (Connector.Argument)arguments.get("main"); |
| if (mainArg == null) { |
| throw new Error("Bad launching connector"); |
| } |
| mainArg.setValue(mainArgs); |
| |
| Connector.Argument optionsArg = (Connector.Argument)arguments.get("options"); |
| if (optionsArg == null) { |
| throw new Error("Bad launching connector"); |
| } |
| optionsArg.setValue(ARGUMENTS); |
| return arguments; |
| } |
| |
| static VirtualMachine launchTarget(String mainArgs) { |
| LaunchingConnector connector = findLaunchingConnector(); |
| Map arguments = connectorArguments(connector, mainArgs); |
| try { |
| return (VirtualMachine) connector.launch(arguments); |
| } catch (IOException exc) { |
| throw new Error("Unable to launch target VM: " + exc); |
| } catch (IllegalConnectorArgumentsException exc) { |
| throw new Error("Internal error: " + exc); |
| } catch (VMStartException exc) { |
| throw new Error("Target VM failed to initialize: " + |
| exc.getMessage()); |
| } |
| } |
| |
| |
| private static void addClassWatch(VirtualMachine vm) { |
| EventRequestManager erm = vm.eventRequestManager(); |
| ClassPrepareRequest classPrepareRequest = erm |
| .createClassPrepareRequest(); |
| classPrepareRequest.addClassFilter(CLASS_NAME); |
| classPrepareRequest.setEnabled(true); |
| } |
| |
| |
| private static void addFieldWatch(VirtualMachine vm, |
| ReferenceType refType) { |
| EventRequestManager erm = vm.eventRequestManager(); |
| Field field = refType.fieldByName(FIELD_NAME); |
| ModificationWatchpointRequest modificationWatchpointRequest = erm |
| .createModificationWatchpointRequest(field); |
| modificationWatchpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD); |
| modificationWatchpointRequest.setEnabled(true); |
| } |
| } |
| |
| class StreamRedirectThread extends Thread { |
| |
| private final BufferedReader in; |
| |
| private static final int BUFFER_SIZE = 2048; |
| |
| /** |
| * Set up for copy. |
| * @param name Name of the thread |
| * @param in Stream to copy from |
| * @param out Stream to copy to |
| */ |
| StreamRedirectThread(String name, InputStream in) { |
| super(name); |
| this.in = new BufferedReader(new InputStreamReader(in)); |
| } |
| |
| /** |
| * Copy. |
| */ |
| public void run() { |
| try { |
| String line; |
| while ((line = in.readLine ()) != null) { |
| System.out.println ("testvm: " + line); |
| } |
| System.out.flush(); |
| } catch(IOException exc) { |
| System.err.println("Child I/O Transfer - " + exc); |
| } |
| } |
| } |