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 {
runCommand(ByteBuffer bb, DataOutputStream os, byte command)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 
executeName(ByteBuffer bb, DataOutputStream os)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 
executeParent(ByteBuffer bb, DataOutputStream os)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 
executeChildren(ByteBuffer bb, DataOutputStream os)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 }
180