[RFA/JDWP] ThreadGroupReferenceCommandSet.java

[Aaron Luchko <aluchko at redhat dot com>]

This implements the ThreadGroupReference CommandSet
http://java.sun.com/j2se/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadGroupReference

Aaron

ChangeLog

2005-07-12  Aaron Luchko  <aluchko@redhat.com>

     * gnu/classpath/jdwp/processor/ThreadGroupReferenceCommandSet.java:
       Implemented the ThreadGroupReference CommandSet.

--- /dev/null	2005-06-09 16:29:11.371620296 -0400
+++ gnu/classpath/jdwp/processor/ThreadGroupReferenceCommandSet.java	2005-07-19 13:37:03.000000000 -0400
@@ -0,0 +1,178 @@
+/* ThreadGroupReferenceCommandSet.java -- class to implement the 
+   ThreadGroupReference Command Set
+   Copyright (C) 2005 Free Software Foundation
+ 
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.classpath.jdwp.processor;
+
+import gnu.classpath.jdwp.Jdwp;
+import gnu.classpath.jdwp.JdwpConstants;
+import gnu.classpath.jdwp.exception.JdwpException;
+import gnu.classpath.jdwp.exception.JdwpInternalErrorException;
+import gnu.classpath.jdwp.exception.NotImplementedException;
+import gnu.classpath.jdwp.id.IdManager;
+import gnu.classpath.jdwp.id.ObjectId;
+import gnu.classpath.jdwp.util.JdwpString;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * A class representing the ThreadGroupReference Command Set.
+ * 
+ * @author Aaron Luchko <aluchko@redhat.com>
+ */
+public class ThreadGroupReferenceCommandSet implements CommandSet
+{
+  // Manages all the different ids that are assigned by jdwp
+  private final IdManager idMan = Jdwp.getIdManager();
+
+  public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)
+    throws JdwpException
+  {
+    try
+      {
+        switch (command)
+          {
+          case JdwpConstants.CommandSet.ThreadGroupReference.NAME:
+            executeName(bb, os);
+            break;
+          case JdwpConstants.CommandSet.ThreadGroupReference.PARENT:
+            executeParent(bb, os);
+            break;
+          case JdwpConstants.CommandSet.ThreadGroupReference.CHILDREN:
+            executeChildren(bb, os);
+            break;
+          default:
+            throw new NotImplementedException("Command " + command +
+              " not found in String Reference Command Set.");
+          }
+      }
+    catch (IOException ex)
+      {
+        // The DataOutputStream we're using isn't talking to a socket at all
+        // So if we throw an IOException we're in serious trouble
+        throw new JdwpInternalErrorException(ex);
+      }
+    return true;
+  }
+
+  private void executeName(ByteBuffer bb, DataOutputStream os)
+    throws JdwpException, IOException
+  {
+    ObjectId oid = idMan.readId(bb);
+    ThreadGroup group = (ThreadGroup) oid.getObject();
+    JdwpString.writeString(os, group.getName());
+  }
+
+  private void executeParent(ByteBuffer bb, DataOutputStream os)
+    throws JdwpException, IOException
+  {
+    ObjectId oid = idMan.readId(bb);
+    ThreadGroup group = (ThreadGroup) oid.getObject();
+    ThreadGroup parent = group.getParent();
+    ObjectId parentId = idMan.getId(parent);
+    parentId.write(os);
+  }
+
+  private void executeChildren(ByteBuffer bb, DataOutputStream os)
+    throws JdwpException, IOException
+  {
+    ObjectId oid = idMan.readId(bb);
+    ThreadGroup group = (ThreadGroup) oid.getObject();
+
+    ThreadGroup jdwpGroup = Thread.currentThread().getThreadGroup();
+    int numThreads = group.activeCount();
+    Thread allThreads[] = new Thread[numThreads];
+
+    group.enumerate(allThreads, false);
+
+    // We need to loop through for the true count since some threads may have
+    // been destroyed since we got activeCount so those spots in the array will
+    // be null. As well we must ignore any threads that belong to jdwp
+    numThreads = 0;
+    for (int i = 0; i < allThreads.length; i++)
+      {
+        Thread thread = allThreads[i];
+        if (thread == null)
+          break; // No threads after this point
+        if (!thread.getThreadGroup().equals(jdwpGroup))
+          numThreads++;
+      }
+
+    os.writeInt(numThreads);
+
+    for (int i = 0; i < allThreads.length; i++)
+      {
+        Thread thread = allThreads[i];
+        if (thread == null)
+          break; // No threads after this point
+        if (!thread.getThreadGroup().equals(jdwpGroup))
+          idMan.getId(thread).write(os);
+      }
+
+    int numGroups = group.activeCount();
+    ThreadGroup allGroups[] = new ThreadGroup[numGroups];
+
+    group.enumerate(allGroups, false);
+
+    // We need to loop through for the true count since some ThreadGroups may
+    // have been destroyed since we got activeCount so those spots in the array
+    // will be null. As well we must ignore any threads that belong to jdwp.
+    numGroups = 0;
+    for (int i = 0; i < allGroups.length; i++)
+      {
+        ThreadGroup tgroup = allGroups[i];
+        if (tgroup == null)
+          break; // No ThreadGroups after this point
+        if (!tgroup.equals(jdwpGroup))
+          numGroups++;
+      }
+
+    os.writeInt(numGroups);
+
+    for (int i = 0; i < allGroups.length; i++)
+      {
+        ThreadGroup tgroup = allGroups[i];
+        if (tgroup == null)
+          break; // No ThreadGroups after this point
+        if (!tgroup.equals(jdwpGroup))
+          idMan.getId(tgroup).write(os);
+      }
+  }
+}