Source for gnu.java.rmi.activation.DefaultActivationSystem

   1: /* DefaultActivationSystem.java -- Default RMI activation system
   2:    Copyright (C) 2006 Free Software Foundation, Inc.
   3: 
   4: This file is 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, or (at your option)
   9: 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; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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.java.rmi.activation;
  40: 
  41: import java.rmi.activation.ActivationSystem;
  42: import java.rmi.registry.LocateRegistry;
  43: import java.rmi.registry.Registry;
  44: 
  45: /**
  46:  * Finds and returns the default activation system for this jre.
  47:  *
  48:  * @author Audrius Meskauskas (audriusa@bioinformatics.org)
  49:  */
  50: public abstract class DefaultActivationSystem
  51: {
  52:   /**
  53:    * The activation system (assigned if once found).
  54:    */
  55:   static ActivationSystem system;
  56: 
  57:   /**
  58:    * The default activation registry port.
  59:    */
  60:   static int ACTIVATION_REGISTRY_PORT;
  61: 
  62:   /**
  63:    * The name of the activation system registry port property.
  64:    */
  65:   static String AS_PORT_PROPERTY = "java.rmi.activation.port";
  66: 
  67:   /**
  68:    * The defalut name of the activation system in the activation registry.
  69:    */
  70:   static String ACTIVATION_SYSTEM_NAME = "java.rmi.activation.ActivationSystem";
  71: 
  72:   /**
  73:    * Get the activation system, default for this jre. If no external activation
  74:    * system exists, the internal activation system will be activated. This
  75:    * internal system is limited in capabilities and should be used exclusively
  76:    * for automated testing, to avoid necessity of starting rmi daemon during
  77:    * testing process.
  78:    */
  79:   public static ActivationSystem get()
  80:   {
  81:     if (system == null)
  82:       try
  83:         {
  84:           // Obtain the port:
  85:           String asr = System.getProperty("java.rmi.activation.port");
  86: 
  87:           if (asr != null)
  88:             {
  89:               try
  90:                 {
  91:                   ACTIVATION_REGISTRY_PORT = Integer.parseInt(asr);
  92:                   if (ACTIVATION_REGISTRY_PORT <= 0)
  93:                     throw new InternalError("Invalid " + asr + " value, "
  94:                                             + ACTIVATION_REGISTRY_PORT);
  95:                 }
  96:               catch (NumberFormatException e)
  97:                 {
  98:                   throw new InternalError("Unable to parse " + asr
  99:                                           + " to integer");
 100:                 }
 101:             }
 102:           else
 103:             ACTIVATION_REGISTRY_PORT = ActivationSystem.SYSTEM_PORT;
 104: 
 105:           // Expect the naming service running first.
 106:           // The local host may want to use the shared registry
 107:           Registry r = LocateRegistry.getRegistry(ACTIVATION_REGISTRY_PORT);
 108:           ActivationSystem system = (ActivationSystem) r.lookup(ACTIVATION_SYSTEM_NAME);
 109:           return system;
 110:         }
 111:       catch (Exception ex)
 112:         {
 113:           system = ActivationSystemTransient.getInstance();
 114:         }
 115: 
 116:     return system;
 117:   }
 118: }