Source for gnu.classpath.jdwp.processor.ThreadGroupReferenceCommandSet

   1: /* ThreadGroupReferenceCommandSet.java -- class to implement the
   2:    ThreadGroupReference Command Set
   3:    Copyright (C) 2005 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: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: 
  40: package gnu.classpath.jdwp.processor;
  41: 
  42: import gnu.classpath.jdwp.JdwpConstants;
  43: import gnu.classpath.jdwp.exception.JdwpException;
  44: import gnu.classpath.jdwp.exception.JdwpInternalErrorException;
  45: import gnu.classpath.jdwp.exception.NotImplementedException;
  46: import gnu.classpath.jdwp.id.ObjectId;
  47: import gnu.classpath.jdwp.util.JdwpString;
  48: 
  49: import java.io.DataOutputStream;
  50: import java.io.IOException;
  51: import java.nio.ByteBuffer;
  52: 
  53: /**
  54:  * A class representing the ThreadGroupReference Command Set.
  55:  *
  56:  * @author Aaron Luchko <aluchko@redhat.com>
  57:  */
  58: public class ThreadGroupReferenceCommandSet
  59:   extends CommandSet
  60: {
  61:   public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)
  62:     throws JdwpException
  63:   {
  64:     try
  65:       {
  66:         switch (command)
  67:           {
  68:           case JdwpConstants.CommandSet.ThreadGroupReference.NAME:
  69:             executeName(bb, os);
  70:             break;
  71:           case JdwpConstants.CommandSet.ThreadGroupReference.PARENT:
  72:             executeParent(bb, os);
  73:             break;
  74:           case JdwpConstants.CommandSet.ThreadGroupReference.CHILDREN:
  75:             executeChildren(bb, os);
  76:             break;
  77:           default:
  78:             throw new NotImplementedException("Command " + command +
  79:               " not found in ThreadGroupReference Command Set.");
  80:           }
  81:       }
  82:     catch (IOException ex)
  83:       {
  84:         // The DataOutputStream we're using isn't talking to a socket at all
  85:         // So if we throw an IOException we're in serious trouble
  86:         throw new JdwpInternalErrorException(ex);
  87:       }
  88: 
  89:     return false;
  90:   }
  91: 
  92:   private void executeName(ByteBuffer bb, DataOutputStream os)
  93:     throws JdwpException, IOException
  94:   {
  95:     ObjectId oid = idMan.readObjectId(bb);
  96:     ThreadGroup group = (ThreadGroup) oid.getObject();
  97:     JdwpString.writeString(os, group.getName());
  98:   }
  99: 
 100:   private void executeParent(ByteBuffer bb, DataOutputStream os)
 101:     throws JdwpException, IOException
 102:   {
 103:     ObjectId oid = idMan.readObjectId(bb);
 104:     ThreadGroup group = (ThreadGroup) oid.getObject();
 105:     ThreadGroup parent = group.getParent();
 106:     if (parent == null) {
 107:         os.writeLong(0L);
 108:     } else {
 109:         ObjectId parentId = idMan.getObjectId(parent);
 110:         parentId.write(os);
 111:     }
 112:   }
 113: 
 114:   private void executeChildren(ByteBuffer bb, DataOutputStream os)
 115:     throws JdwpException, IOException
 116:   {
 117:     ObjectId oid = idMan.readObjectId(bb);
 118:     ThreadGroup group = (ThreadGroup) oid.getObject();
 119: 
 120:     ThreadGroup jdwpGroup = Thread.currentThread().getThreadGroup();
 121:     int numThreads = group.activeCount();
 122:     Thread allThreads[] = new Thread[numThreads];
 123: 
 124:     group.enumerate(allThreads, false);
 125: 
 126:     // We need to loop through for the true count since some threads may have
 127:     // been destroyed since we got activeCount so those spots in the array will
 128:     // be null. As well we must ignore any threads that belong to jdwp
 129:     numThreads = 0;
 130:     for (int i = 0; i < allThreads.length; i++)
 131:       {
 132:         Thread thread = allThreads[i];
 133:         if (thread == null)
 134:           break; // No threads after this point
 135:         if (!thread.getThreadGroup().equals(jdwpGroup))
 136:           numThreads++;
 137:       }
 138: 
 139:     os.writeInt(numThreads);
 140: 
 141:     for (int i = 0; i < allThreads.length; i++)
 142:       {
 143:         Thread thread = allThreads[i];
 144:         if (thread == null)
 145:           break; // No threads after this point
 146:         if (!thread.getThreadGroup().equals(jdwpGroup))
 147:           idMan.getObjectId(thread).write(os);
 148:       }
 149: 
 150:     int numGroups = group.activeCount();
 151:     ThreadGroup allGroups[] = new ThreadGroup[numGroups];
 152: 
 153:     group.enumerate(allGroups, false);
 154: 
 155:     // We need to loop through for the true count since some ThreadGroups may
 156:     // have been destroyed since we got activeCount so those spots in the array
 157:     // will be null. As well we must ignore any threads that belong to jdwp.
 158:     numGroups = 0;
 159:     for (int i = 0; i < allGroups.length; i++)
 160:       {
 161:         ThreadGroup tgroup = allGroups[i];
 162:         if (tgroup == null)
 163:           break; // No ThreadGroups after this point
 164:         if (!tgroup.equals(jdwpGroup))
 165:           numGroups++;
 166:       }
 167: 
 168:     os.writeInt(numGroups);
 169: 
 170:     for (int i = 0; i < allGroups.length; i++)
 171:       {
 172:         ThreadGroup tgroup = allGroups[i];
 173:         if (tgroup == null)
 174:           break; // No ThreadGroups after this point
 175:         if (!tgroup.equals(jdwpGroup))
 176:           idMan.getObjectId(tgroup).write(os);
 177:       }
 178:   }
 179: }