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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.util;


//------------------------------------------------------------------------------

import java.util.ArrayList;
import java.util.List;

/**
 Thread-related utility functions.
 
 @author J. Alex Taylor, hairyfatguy.com
 
 */
//------------------------------------------------------------------------------
// com.hfg XML/HTML Coding Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public class ThreadUtil
{
   //--------------------------------------------------------------------------
   public static void sleep(long inMilliseconds)
   {
      try
      {
         Thread.sleep(inMilliseconds);
      }
      catch (InterruptedException e)
      {
         // Ignore
      }
   }

   //--------------------------------------------------------------------------
   public static ThreadGroup getThreadRoot()
   {
      // Wander up the thread group hierarchy to the top group
      ThreadGroup rootGroup = Thread.currentThread().getThreadGroup();
      ThreadGroup parentGroup;
      while ((parentGroup = rootGroup.getParent()) != null)
      {
         rootGroup = parentGroup;
      }

      return rootGroup;
   }

   //--------------------------------------------------------------------------
   public static List getAllThreadGroups()
   {
      ThreadGroup rootGroup = getThreadRoot();
      ThreadGroup[] threadGroupArray = new ThreadGroup[rootGroup.activeGroupCount()];
      while (rootGroup.enumerate(threadGroupArray, true) == threadGroupArray.length)
      {
         threadGroupArray = new ThreadGroup[threadGroupArray.length * 2];
      }

      List threadGroups = new ArrayList<>(threadGroupArray.length);
      threadGroups.add(rootGroup);

      for (ThreadGroup threadGroup : threadGroupArray)
      {
         if (threadGroup != null)
         {
            threadGroups.add(threadGroup);
         }
      }

      return threadGroups;
   }

   //--------------------------------------------------------------------------
   public static ThreadGroup getThreadGroup(String inName)
   {
      ThreadGroup requestedThreadGroup = null;

      for (ThreadGroup threadGroup : getAllThreadGroups())
      {
         if (threadGroup.getName().equals(inName))
         {
            requestedThreadGroup = threadGroup;
            break;
         }
      }

      return requestedThreadGroup;
   }
}