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EventHandler.java

package jde.debugger;

import jde.debugger.spec.*;

import java.util.*;

import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import com.sun.jdi.connect.*;
import jde.debugger.LispForm;

/**
 * EventHandler.java
 * <p>
 * Each debugee VM has an event handler thread on the jdebug side
 * associated with it that receive all the events from the debugee
 * vm. In turn, the event handler thread passes the events on to the
 * jde, indicating if the vm/current thread was suspended.
 * <p>
 * Created: Tue Jul  6 14:08:44 1999
 *
 * @author Amit Kumar
 * @since 0.1
 */

00028 public class EventHandler implements Runnable, Protocol {

  /** Are we connected to the VM? */
00031   boolean connected = true;
    
  /** The process for which we're the event handler */
00034   final DebuggeeProcess proc;

  /** The ID of the process */
00037   final Integer procID;

  final JDE jde = JDE.getJDE();

  /**
   * My own thread. Used when we want to suspend ourselves or some such
   * weird stuff :-)
   */
00045   final Thread thread;

  /** Keeping track of if the thread is over yet or not */
00048   boolean completed = false;

  /**
   * Used by the event handlers to indicate if the app should be
   * resumed after the event occured.
   */
00054   boolean resumeApp;

  public EventHandler(DebuggeeProcess proc) {
    /* the q gets all the events from the vm */
    this.proc = proc;
    this.procID = proc.getId();
    this.thread = new Thread(this, "Event Handler for App #"+procID);
    this.thread.start();
  }

  public void shutdown() {
    connected = false;
    thread.interrupt();
    while (!completed) {
      try {wait();} catch (InterruptedException ex) {}
    }
  }

  /**
   * The thread reads an eventset at a time from the application queue,
   * and processes it. Essentially, one by one, each event of the eventset
   * is sent to the corresponding "handler", and if at least one of them
   * returns a non-null value, we pass on the eventset (and the values
   * returned by the handlers) to jde. Otherwise, we just resume the vm
   * (regardless of the suspend policy) and wait for the next eventset.
   * <p>
   * This is the syntax of the event set:
   * <pre>
   * (JDE_BUG_EVENTSET <u>suspend-state</u> <u>thread</u> [<u>event-string</u>]+)
   * </pre>
   * 
   * <ul>
   * <li> <u>suspend-state</u> is one of "all", "none" and "thread"
   * <li> <u>thread</u> is either nil, or the thread corresponding to the
   *      event set.
   * <li> <u>event-string</u> is the reply from a handler method. See the
   *      individual handler methods.
   * <li> The suspend policy is as follows. Some of the commands (see
   *      the {@link Protocol protocol}) allow for specifying the suspend
   *      policy for the corresponding event. For example, we might specify
   *      that the vm resume automatically after a  method entry event is
   *      reported.
   *      <p>
   *      Firstly, when multiple events are sent (in an event-set), the
   *      suspend policy of the entire event set is the one that would
   *      suspend the most threads. So, if a breakpoint-hit is sent with
   *      the method-entry event, and the breakpoint-hit wants to suspend
   *      the vm, while method-entry wants to resume, overall, the event
   *      set suspend policy will be to suspend
   *      <p>
   *      Further, some of the events might occur that haven't been
   *      explicitly requested, and hence we haven't set their suspend
   *      policy anyway. In these cases, and even otherwise, another
   *      decision is made at the time of handling of events regarding the
   *      suspension/resumption of the vm.
   *      <p>
   *      So, when an event set is received, each event is handled (via
   *      it's handler method). Each event ANDs to a variable resumeApp
   *      what it thinks should be done to the app: for example, the
   *      vmDeathEvent handler wants to resume, so it does
   *      <code>resumeApp &= true;</code>. In the same way, when a
   *      breakpoint is hit (and matches the constraints), it does a
   *      <code>resumeApp &= false:</code>.
   *      <p>
   *      After all events have been handled, we check the value of
   *      resumeApp. If it's true, we resume the vm. If not, we check
   *      the suspend-policy of the event set, and take appropriate action.
   *      <p>
   *      This two-tier suspend-policy handling might be simplified to
   *      some extent once all commands support setting of a suspend
   *      policy, with that and that alone being used to decide on what
   *      to do with the vm.
   *      <p>
   *      A problem with that approach is that since we do a second pass
   *      on the events when we get the eventset to determine if the
   *      events should be sent to the user (eg. a breakpoint-hit is still
   *      not interesting if it doesn't occur on the "right" thread), the
   *      latter approach might not work well at all.
   * </ul>
   */ 
00134   public void run() {
    EventQueue queue = proc.getEventQueue();
    /* only need to run while we're connected */
    while (connected) {
      try {
      EventSet eventSet = queue.remove();

      resumeApp = true;

      List events = new ArrayList();
      EventIterator it = eventSet.eventIterator();

      //  System.out.println("Suspend policy of eventset: "+((eventSet.suspendPolicy() == EventRequest.SUSPEND_NONE)?"none":"not none"));

      while (it.hasNext()) {
        //            System.out.println("An event");
        LispForm sendLispForm = handleEvent(it.nextEvent());
        // if the handler thinks the user doesn't <i>deserve</i>
        // the event, it'll return null. another microsoftism
        // in the code... :-(
        if (sendLispForm != null) {
          events.add(sendLispForm);
        }
      }

      // if no event wants to inform itself to the user, what
      // are we doing anyway? 
      if (events.size() == 0) {
        eventSet.resume();
        continue;
      }
            
      String suspendStateString;
      if (resumeApp) {
        // this resume does a vm resume or a thread resume
        // depending on how it was suspended
        suspendStateString = "none";
        eventSet.resume();
      } else {
        switch(eventSet.suspendPolicy()) {
        case EventRequest.SUSPEND_ALL: {
          suspendStateString = "all";
          break;
        }
        case EventRequest.SUSPEND_EVENT_THREAD: {
          suspendStateString = "thread";
          break;
        }
        case EventRequest.SUSPEND_NONE: {
          suspendStateString = "none";
          eventSet.resume();
          break;
        }
        default: {
          suspendStateString = "invalid";
          break;
        }
        }
      }

      String eventSetString = "\""+suspendStateString+"\"";

      ThreadReference eventThread = getCurrentThread(eventSet);
      if (eventThread == null) {
        eventSetString += " nil";
      } else {
        eventSetString +=  BR +
          Rep.getThreadRep(eventThread, proc.getStore());
      }
            
      Iterator iter = events.iterator();
      while (iter.hasNext()) {
        eventSetString +=  BR +iter.next();
      }
            
      // finally, we send the events to The Man. (or woman...)
      jde.signal(procID, EVENTSET, new LispForm(eventSetString));
            
      } catch (InterruptedException ex) {
      // Debug.printIf(ex);
      // used by shutdown
      } catch (VMDisconnectedException ex) {
      Debug.printIf(ex);
      handleDisconnectedException();
      }
    }
    synchronized (this) {
      completed = true;
      notifyAll();
    }

  }


  /**
   * Handles the events that happened
   *
   * @param event One of the events in the event set.
   * @return A LispForm that indicates what should be sent to jde. This
   * should be of the form "(list jde-dbo-EVENT-event [args])". Each
   * of the functions called herein should return a LispForm of the above
   * form.
   */
00237   private LispForm handleEvent(Event event) {
    if (event instanceof BreakpointEvent) {
      return breakpointEvent((BreakpointEvent)event);
    } else if (event instanceof StepEvent) {
      return stepEvent((StepEvent)event);
    } else if (event instanceof WatchpointEvent) {
      return watchpointEvent((WatchpointEvent)event);
    } else if (event instanceof ExceptionEvent) {
      return exceptionEvent((ExceptionEvent)event);
    }
    else if (event instanceof ThreadStartEvent) {
      return threadStartEvent((ThreadStartEvent)event);
    } else if (event instanceof ThreadDeathEvent) {
      return threadDeathEvent((ThreadDeathEvent)event);
    }
    else if (event instanceof MethodEntryEvent) {
      return methodEntryEvent((MethodEntryEvent)event);
    } else if (event instanceof MethodExitEvent) {
      return methodExitEvent((MethodExitEvent)event);
    }
    else if (event instanceof ClassPrepareEvent) {
      return classPrepareEvent((ClassPrepareEvent)event);
    }
    else if (event instanceof VMStartEvent) {
      return vmStartEvent((VMStartEvent)event);
    } else if (event instanceof VMDeathEvent) {
      return vmDeathEvent((VMDeathEvent)event);
    } else if (event instanceof VMDisconnectEvent) {
      return vmDisconnectEvent((VMDisconnectEvent)event);
    } else {
      return otherEvent(event);
    }
  }

  /**
   * Duh... we don't recognize this event... or, we choose not to do
   * anything about it
   */
00275   private LispForm otherEvent(Event event) {
    resumeApp &= true;
    return new LispForm("(list '"+EVENT_OTHER+")");
  }

  /**
   * What we should do if we get disconnected while we're doing something
   * else.
   */
00284   private void handleDisconnectedException() {
    // disconnected while handling some other event. flush queue
    // and deal with disconnectEvent and deathEvents
    EventQueue queue = proc.getEventQueue();
    while (connected) {
      try {
      EventSet eventSet = queue.remove();
      EventIterator iter = eventSet.eventIterator();
      while (iter.hasNext()) {
        Event evt = (Event)iter.next();
        if (evt instanceof VMDeathEvent) {
          vmDeathEvent(evt);
        } else if (evt instanceof VMDisconnectEvent) {
          vmDisconnectEvent(evt);
        }
      }
      } catch (InterruptedException ex) {
      Debug.printIf(ex);
      // ignore
      }
    }
  }

  /**
   * Get the current thread of this event set. It's not necessary for
   * an event set to have a thread associated with it: in those cases
   * just return null.
   *
   * @param eventSet The event set that occured
   * @return <code>null</code> if there is no thread associated, otherwise
   * the ThreadReference of the Thread
   */
00316   private ThreadReference getCurrentThread(EventSet eventSet) {
    ThreadReference thread;
    if (eventSet.size() > 0) {
      /*
       * If any event in the set has a thread associated with it, 
       * they all will, so just grab the first one. 
       */
      Event event = (Event)eventSet.iterator().next(); // Is there a better way?
      thread = getEventThread(event);
    } else {
      thread = null;
    }
    return thread;
  }

  /**
   * Black magic to divine the ThreadReference of the
   * event. Question: can we use "Black magic" and "divine" in the same
   * sentence?
   *
   * @param event An event from the event set: any event will do
   * @return The ThreadReference of the thread
   */
00339   private ThreadReference getEventThread(Event event) {
    if (event instanceof ClassPrepareEvent) {
      return ((ClassPrepareEvent)event).thread();
    } else if (event instanceof LocatableEvent) {
      return ((LocatableEvent)event).thread();
    } else if (event instanceof ThreadStartEvent) {
      return ((ThreadStartEvent)event).thread();
    } else if (event instanceof ThreadDeathEvent) {
      return ((ThreadDeathEvent)event).thread();
    } else if (event instanceof VMStartEvent) {
      return ((VMStartEvent)event).thread();
    } else {
      return null;
    }
  }


  /**
   * For events with corresponding specs (eg. watchpoints), checks to see
   * if the event thread matches the thread constraint in the spec.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * nil                              # If no such constraint
   *                                  #   was found in the spec
   * "Error mesg"                     # Constraint found, but error
   *                                  #   during evaluation
   * (list "on_thread_id" threadID)   # Constraint found, satisfied
   * (list "on_thread_name" "name")
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> The above are strings: so the '"'s above are actually quoted
   *      in the string returned.
   * <li> Note that if the Constraint is <b>found but does not satisfy</b>
   *      'null' is returned: this is tested in the handler routines.
   * </ul>
   */
00379   private String threadMatch(Event event) {
    Object thread =
      event.request().getProperty(EventRequestSpec.threadKey);
    if (thread == null) {
      return "nil";
    } else if (thread instanceof Long) {
      ThreadReference t = getEventThread(event);
      if (t.uniqueID() == ((Long)thread).longValue()) {
      return "(list \"on_thread_id\" "+t.uniqueID()+")";
      } else {
      return null;
      }
    } else if (thread instanceof String) {
      ThreadReference tRef =
      proc.getThread(thread.toString());
      ThreadReference t = getEventThread(event);
          
      if (t.equals(tRef)) {
      return "(list \"on_thread_name\""
        +" \""+thread.toString()+"\")";
      } else {
      return null;
      }
    } else {
      return "\"Error matching thread\"";
    }
  }

  /**
   * For events with corresponding specs (eg. watchpoints), evaluates the
   * expression stored in the spec, if any, to check if the event is
   * interesting to the user or not. The constraint is thus the expression.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * nil                              # If no such constraint
   *                                  #   was found in the spec
   * "Error mesg"                     # Constraint found, but error
   *                                  #   during evaluation
   * (list "expression")              # Constraint found, satisfied
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> The above are strings: so the '"'s above are actually quoted
   *      in the string returned.
   * <li> Note that if the Constraint is <b>found but does not satisfy</b>
   *      'null' is returned: this is tested in the handler routines.
   * </ul>
   */
00430   private String expressionSuccess(Event event) {
    Object exprObject =
      event.request().getProperty(EventRequestSpec.expressionKey);
    if (exprObject != null) {
      String expr = exprObject.toString();
      try {
      StackFrame frame = getEventThread(event).frame(0);
      Value val = Etc.evaluate(expr, frame);
      if (!val.type().name().equals("boolean")) {
        return "\"Expression evaluates to non-boolean\"";
      } else {
        BooleanValue boolValue = (BooleanValue)val;
        if (boolValue.value() == true) {
          return "(list \""+expr+"\")";
        } else {
          return null;
        }
      }
      } catch (Exception ex) {
      Debug.printIf(ex);
      return "\"Expression didn't evaluate correctly\"";
      }
    }
    return "nil";
  }


  /**
   * For watchpoints, when the object-id specified during the command
   * should match the object id of the event.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * nil                              # if no such constraint was in spec
   * "Error mesg"                     # Constraint found, error in eval.
   * (list <u>object-id</u>)                 # Constraint found, satisfied.
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> The above are strings: so the '"'s above are actually quoted
   *      in the string returned.
   * <li> Note that if the Constraint is <b>found but does not satisfy</b>
   *      'null' is returned: this is tested in the handler routines.
   * <li> <u>object-id</u> is the object id that was specified in the
   *      command
   * </ul>
   */
00479   private String objectIDMatches(WatchpointEvent event) {
    String objectIDString;
    Object idObject =
      event.request().getProperty(WatchpointSpec.objectIDKey);
    if (idObject == null) {
      return "nil";
    } else if (idObject instanceof Long) {
      Long id = (Long)idObject;
      if (event.object() == null) {
      return "(list "+id+")";
      } else if (event.object().uniqueID() == id.longValue()) {
      return "(list "+id+")";
      } else {
      return null;
      }
    } else {
      return "\"Object ID was not a Long\"";
    }
  } 

    
  /**
   * A Breakpoint was hit. We check (based on information in the event
   * request; put in when the spec was resolved; that's sent along with
   * the event) if the user wants to know about this event. If so, we
   * return a lispform, else return null.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_BREAKPOINT_HIT breakpoint-hit-function} specID {@link Rep#getLocationRep(Location) location} {@link #threadMatch thread-string} {@link #expressionSuccess expression-string})
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> If one of the constraints returns null instead of a string, it
   *      means the constraint isn't satisfied. We return null, indicating
   *      that the user is not interested in the event of this event :-)
   * </ul>
   */
00519   private LispForm breakpointEvent(BreakpointEvent event) {

    Long specID = ((EventRequestSpec)event.request().getProperty(EventRequestSpec.specPropertyKey)).getID();

    // check if the current thread is ok.
    String threadString = threadMatch(event);
    if (threadString == null) {
      resumeApp &= true;
      return null;
    }
            
    // check if the expression matches
    String exprString = expressionSuccess(event);
    if (exprString == null) {
      resumeApp &= true;
      return null;
    }

    resumeApp &= false;
    return new LispForm("(list '"+EVENT_BREAKPOINT_HIT
                  +" "+specID
                  + BR +Rep.getLocationRep(event.location())
                  +" "+threadString
                  +" "+exprString+")");

  }


  /**
   * A step event occured.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_STEP_COMPLETED step-function} {@link Rep#getLocationRep(Location) location-string})
   * </pre>
   */
00556   private LispForm stepEvent(StepEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"
                  +EVENT_STEP_COMPLETED
                  +" "+Rep.getLocationRep(event.location())
                  +")");
  }

  /**
   * A Watchpoint occured. We check (based on information in the event
   * request; put in when the spec was resolved; that's sent along with
   * the event) if the user wants to know about this event. If so, we
   * return a lispform, else return null.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_WATCHPOINT_HIT watchpoint-hit-function} specID {@link Rep#getObjectRep(ObjectReference,ObjectStore) object-on-which-hit} {@link Rep#getFieldValueRep(Field, Value, ObjectStore) field-and-value} {@link Rep#getLocationRep(Location) location}
   *       {@link #objectIDMatches object-id-string} {@link #threadMatch thread-string} {@link #expressionSuccess expression-string})
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> If one of the constraints returns null instead of a string, it
   *      means the constraint isn't satisfied. We return null, indicating
   *      that the user is not interested in the event of this event :-)
   * </ul>
   */
00584   private LispForm watchpointEvent(WatchpointEvent event) {

    Long specID = ((EventRequestSpec)event.request().getProperty(EventRequestSpec.specPropertyKey)).getID();

    //      System.out.println("Suspend policy of WatchpointEvent: "+((event.request().suspendPolicy() == EventRequest.SUSPEND_NONE)?"none":"not none"));

    // check if the current thread is ok.
    String threadString = threadMatch(event);
    if (threadString == null) {
      resumeApp &= true;
      return null;
    }
            
    // check if the expression matches
    String exprString = expressionSuccess(event);
    if (exprString == null) {
      resumeApp &= true;
      return null;
    }

    // check if the object id (if specified) matches the event object
    String objectIDString = objectIDMatches(event);
    if (objectIDString == null) {
      resumeApp &= true;
      return null;
    }

    String fieldValueString =
      Rep.getFieldValueRep(event.field(), event.valueCurrent(),
                     proc.getStore()).toString();

    String objectString = Rep.getObjectRep(event.object(),
                                 proc.getStore()).toString();

    resumeApp &= false;
    return new LispForm("(list '"+EVENT_WATCHPOINT_HIT
                  +" "+specID
                  + BR +objectString
                  + BR +fieldValueString
                  + BR +Rep.getLocationRep(event.location())
                  + BR +objectIDString
                  +" "+threadString
                  +" "+exprString+")");

  }


  /**
   * An exception event occured. Depending on the command, it could occur
   * for both caught and uncaught exceptions.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_EXCEPTION exception-function} specID {@link Rep#getObjectRep(ObjectReference,ObjectStore) exception} {@link #threadMatch thread-string})
   * </pre>
   *
   * <b>Comments:</b>
   * <ul>
   * <li> If one of the constraints returns null instead of a string, it
   *      means the constraint isn't satisfied. We return null, indicating
   *      that the user is not interested in the event of this event :-)
   * </ul>
   */
00648   private LispForm exceptionEvent(ExceptionEvent event) {

    if (event.request() == null) {
      resumeApp &= true;
      return null;
    }
      
    Long specID = ((EventRequestSpec)event.request().getProperty(EventRequestSpec.specPropertyKey)).getID();
          
    ExceptionRequest request =
      (ExceptionRequest)event.request();

    // check if the current thread is ok.
    String threadString = threadMatch(event);
    if (threadString == null) {
      resumeApp &= true;
      return null;
    }
            
    resumeApp &= false;
    return new LispForm("(list '"
                  +EVENT_EXCEPTION
                  +" "+specID
                  + BR +Rep.getObjectRep(event.exception(),
                                     proc.getStore())
                  + BR +threadString+")");
  }


  /**
   * A method was entered.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_METHOD_ENTRY method-entry-function} {@link Rep#getMethodRep method})
   * </pre>
   */
00686   private LispForm methodEntryEvent(MethodEntryEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"
                  + EVENT_METHOD_ENTRY
                  + BR +Rep.getMethodRep(event.method())
                  +")");
  }
                      
  /**
   * A method was exit.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_METHOD_EXIT method-exit-function} {@link Rep#getMethodRep method})
   * </pre>
   */
00703   private LispForm methodExitEvent(MethodExitEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"
                  + EVENT_METHOD_EXIT
                  + BR +Rep.getMethodRep(event.method())
                  +")");
  }
                      

  /**
   * A thread started
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_THREAD_START thread-start-function} {@link Rep#getThreadRep thread})
   * </pre>
   */
00721   private LispForm threadStartEvent(ThreadStartEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"
                  + EVENT_THREAD_START
                  + BR +Rep.getThreadRep(event.thread(),
                                     proc.getStore())
                  +")");
  }
                      
  /**
   * A thread died.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_THREAD_DEATH thread-death-function} {@link Rep#getThreadRep thread})
   * </pre>
   */
00739   private LispForm threadDeathEvent(ThreadDeathEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"
                  + EVENT_THREAD_DEATH
                  + BR +Rep.getThreadRep(event.thread(),
                                     proc.getStore())
                  +")");
  }
                      

  /**
   * A class was prepared. The user might not have even requested for
   * this event: we set it up by default in {@link Application#Application}
   * because we need it for resolution of specs.
   * <p>
   * If a user also requests for this event, a particular property is
   * likely not set, and that is how we know that we're supposed to
   * handle the event for the user.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_CLASS_PREPARE class-prepare-function} reference-type)
   * </pre>
   */
00764   private LispForm classPrepareEvent(ClassPrepareEvent event) {
    proc.resolve(event.referenceType());
    // now find out if this event was also requested by the user.
    // it will be, if the "default" property does NOT exists in the
    // corresponding request. 
    EventRequest request = event.request();
    if (request.getProperty("default") == null) {
      resumeApp &= false;
      return new LispForm("(list '"+EVENT_CLASS_PREPARE
                    +" \""+event.referenceType().name()+"\")");
    } else {
      resumeApp &= true;
      return null;
    }
  }

  /**
   * A class was unloaded.
   * <p>
   *
   * <b>Syntax:</b>
   * <pre>
   * (list {@link Protocol#EVENT_CLASS_UNLOAD class-unload-function} reference-type)
   * </pre>
   */
00789   private LispForm classUnloadEvent(ClassUnloadEvent event) {
    resumeApp &= false;
    return new LispForm("(list '"+EVENT_CLASS_UNLOAD
                  +" \""+event.className()+"\")");
  }
    
  private LispForm vmStartEvent(Event event) {
    resumeApp &= false;
    return new LispForm("(list '"+EVENT_VM_START+")");
  }
    
  private LispForm vmDeathEvent(Event event) {
    resumeApp &= true;
    return new LispForm("(list '"+EVENT_VM_DEATH+")");
  }

  private LispForm vmDisconnectEvent(Event event) {
    connected = false;
    resumeApp &= true;
    proc.shutdown();
    return new LispForm("(list '"+EVENT_VM_DISCONNECT+")");
  }
                  
} // EventHandler

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