Source for gnu.javax.net.ssl.provider.DelegatedTask

   1: /* DelegatedTask.java --
   2:    Copyright (C) 2006  Free Software Foundation, Inc.
   3: 
   4: This file is a part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2 of the License, or (at
   9: your option) any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; if not, write to the Free Software
  18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  19: USA
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.javax.net.ssl.provider;
  40: 
  41: import gnu.classpath.debug.Component;
  42: import gnu.classpath.debug.SystemLogger;
  43: 
  44: /**
  45:  * @author Casey Marshall (csm@gnu.org)
  46:  */
  47: public abstract class DelegatedTask implements Runnable
  48: {
  49:   private static final SystemLogger logger = SystemLogger.SYSTEM;
  50:   private boolean hasRun;
  51:   protected Throwable thrown;
  52: 
  53:   protected DelegatedTask()
  54:   {
  55:     hasRun = false;
  56:   }
  57: 
  58:   public final void run()
  59:   {
  60:     if (hasRun)
  61:       throw new IllegalStateException("task already ran");
  62:     try
  63:       {
  64:         if (Debug.DEBUG)
  65:           logger.logv(Component.SSL_DELEGATED_TASK,
  66:                       "running delegated task {0} in {1}", this,
  67:                       Thread.currentThread());
  68:         implRun();
  69:       }
  70:     catch (Throwable t)
  71:       {
  72:         if (Debug.DEBUG)
  73:           logger.log(Component.SSL_DELEGATED_TASK, "task threw exception", t);
  74:         thrown = t;
  75:       }
  76:     finally
  77:       {
  78:         hasRun = true;
  79:       }
  80:   }
  81: 
  82:   public final boolean hasRun()
  83:   {
  84:     return hasRun;
  85:   }
  86: 
  87:   public final Throwable thrown()
  88:   {
  89:     return thrown;
  90:   }
  91: 
  92:   protected abstract void implRun() throws Throwable;
  93: }