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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      */
main(String args[])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 }
86