Source for gnu.classpath.jdwp.event.ThreadStartEvent

   1: /* ThreadStartEvent.java -- An event specifying that a new thread
   2:    has started in the virtual machine
   3:    Copyright (C) 2005, 2007 Free Software Foundation
   4: 
   5: This file is part of GNU Classpath.
   6: 
   7: GNU Classpath is free software; you can redistribute it and/or modify
   8: it under the terms of the GNU General Public License as published by
   9: the Free Software Foundation; either version 2, or (at your option)
  10: any later version.
  11: 
  12: GNU Classpath is distributed in the hope that it will be useful, but
  13: WITHOUT ANY WARRANTY; without even the implied warranty of
  14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15: General Public License for more details.
  16: 
  17: You should have received a copy of the GNU General Public License
  18: along with GNU Classpath; see the file COPYING.  If not, write to the
  19: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20: 02110-1301 USA.
  21: 
  22: Linking this library statically or dynamically with other modules is
  23: making a combined work based on this library.  Thus, the terms and
  24: conditions of the GNU General Public License cover the whole
  25: combination.
  26: 
  27: As a special exception, the copyright holders of this library give you
  28: permission to link this library with independent modules to produce an
  29: executable, regardless of the license terms of these independent
  30: modules, and to copy and distribute the resulting executable under
  31: terms of your choice, provided that you also meet, for each linked
  32: terms of your choice, provided that you also meet, for each linked
  33: independent module, the terms and conditions of the license of that
  34: module.  An independent module is a module which is not derived from
  35: or based on this library.  If you modify this library, you may extend
  36: this exception to your version of the library, but you are not
  37: obligated to do so.  If you do not wish to do so, delete this
  38: exception statement from your version. */
  39: 
  40: 
  41: package gnu.classpath.jdwp.event;
  42: 
  43: import gnu.classpath.jdwp.JdwpConstants;
  44: import gnu.classpath.jdwp.VMIdManager;
  45: import gnu.classpath.jdwp.id.ThreadId;
  46: 
  47: import java.io.DataOutputStream;
  48: import java.io.IOException;
  49: 
  50: /**
  51:  * "Notification of a new running thread in the target VM. The new
  52:  * thread can be the result of a call to {@link java.lang.Thread#start} or
  53:  * the result of attaching a new thread to the VM though JNI. The
  54:  * notification is generated by the new thread some time before its
  55:  * execution starts. Because of this timing, it is possible to receive
  56:  * other events for the thread before this event is received. (Notably,
  57:  * Method Entry Events and Method Exit Events might occur during thread
  58:  * initialization. It is also possible for the VirtualMachine AllThreads
  59:  * command to return a thread before its thread start event is received.
  60:  *
  61:  * <p>Note that this event gives no information about the creation of the
  62:  * thread object which may have happened much earlier, depending on the
  63:  * VM being debugged." -- JDWP 1.4.2
  64:  *
  65:  * @author Keith Seitz  (keiths@redhat.com)
  66:  */
  67: public class ThreadStartEvent
  68:   extends Event
  69: {
  70:   private Thread _thread;
  71: 
  72:   /**
  73:    * Constructs a new ThreadStartEvent object
  74:    *
  75:    * @param thread  the thread ID in which event occurred
  76:    */
  77:   public ThreadStartEvent (Thread thread) {
  78:     super (JdwpConstants.EventKind.THREAD_START);
  79:     _thread = thread;
  80:   }
  81: 
  82:   /**
  83:    * Returns a specific filtering parameter for this event.
  84:    * Valid types are ThreadId.
  85:    *
  86:    * @param type  the type of parameter desired
  87:    * @returns the desired parameter or <code>null</code>
  88:    */
  89:   public Object getParameter (int type)
  90:   {
  91:     if (type == EVENT_THREAD)
  92:       return _thread;
  93: 
  94:     return null;
  95:   }
  96: 
  97:   /**
  98:    * Writes the event to the given stream
  99:    *
 100:    * @param outStream  the output stream to write the event to
 101:    */
 102:   protected void _writeData (DataOutputStream outStream)
 103:     throws IOException
 104:   {
 105:     VMIdManager idm = VMIdManager.getDefault();
 106:     ThreadId tid = (ThreadId) idm.getObjectId (_thread);
 107:     tid.write (outStream);
 108:   }
 109: }