1 /*
   2  * Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.rmi.server;
  27 
  28 import java.rmi.activation.ActivationGroupDesc;
  29 import java.rmi.activation.ActivationGroupID;
  30 import java.rmi.activation.ActivationGroup;
  31 
  32 /**
  33  * This is the bootstrap code to start a VM executing an activation
  34  * group.
  35  *
  36  * The activator spawns (as a child process) an activation group as needed
  37  * and directs activation requests to the appropriate activation
  38  * group. After spawning the VM, the activator passes some
  39  * information to the bootstrap code via its stdin:
  40  * <ul>
  41  * <li> the activation group's id,
  42  * <li> the activation group's descriptor (an instance of the class
  43  *    java.rmi.activation.ActivationGroupDesc) for the group, adn
  44  * <li> the group's incarnation number.
  45  * </ul><p>
  46  *
  47  * When the bootstrap VM starts executing, it reads group id and
  48  * descriptor from its stdin so that it can create the activation
  49  * group for the VM.
  50  *
  51  * @author Ann Wollrath
  52  */
  53 public abstract class ActivationGroupInit
  54 {
  55     /**
  56      * Main program to start a VM for an activation group.
  57      */
  58     public static void main(String args[])
  59     {
  60         try {
  61             if (System.getSecurityManager() == null) {
  62                 System.setSecurityManager(new SecurityManager());
  63             }
  64             // read group id, descriptor, and incarnation number from stdin
  65             MarshalInputStream in = new MarshalInputStream(System.in);
  66             ActivationGroupID id  = (ActivationGroupID)in.readObject();
  67             ActivationGroupDesc desc = (ActivationGroupDesc)in.readObject();
  68             long incarnation = in.readLong();
  69 
  70             // create and set group for the VM
  71             ActivationGroup.createGroup(id, desc, incarnation);
  72         } catch (Exception e) {
  73             System.err.println("Exception in starting ActivationGroupInit:");
  74             e.printStackTrace();
  75         } finally {
  76             try {
  77                 System.in.close();
  78                 // note: system out/err shouldn't be closed
  79                 // since the parent may want to read them.
  80             } catch (Exception ex) {
  81                 // ignore exceptions
  82             }
  83         }
  84     }
  85 }