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RollCall.d

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00001 /*******************************************************************************
00002 
00003         @file RollCall.d
00004         
00005         Copyright (C) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026 
00027                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00028 
00029         
00030         @version        Initial version, July 2004      
00031         @author         Kris
00032 
00033 
00034 *******************************************************************************/
00035 
00036 module mango.cluster.qos.socket.RollCall;
00037 
00038 private import mango.cache.Payload;
00039 
00040 /******************************************************************************
00041 
00042         An IPayload used by the cluster client and server during discovery 
00043         lookup and liveness broadcasts. The client broadcasts one of these
00044         at startup to see which servers are alive. The server responds with
00045         a reply RollCall stating its name and port. The server will also
00046         broadcast one of these when it first starts, such that any running
00047         clients can tell the server has 'recovered'.
00048          
00049 ******************************************************************************/
00050 
00051 class RollCall : Payload
00052 {
00053         char[]  name;
00054         int     port1,
00055                 port2;
00056         bool    request;
00057 
00058         private import mango.io.PickleRegistry;
00059 
00060         /***********************************************************************
00061         
00062                 Register this class for pickling, so we can resurrect
00063                 instances when they arrive on a network datagram.
00064 
00065         ***********************************************************************/
00066 
00067         static this ()
00068         {
00069                 PickleRegistry.enroll (new RollCall);
00070         }
00071 
00072         /**********************************************************************
00073 
00074         **********************************************************************/
00075 
00076         this ()
00077         {
00078         }
00079 
00080         /**********************************************************************
00081 
00082         **********************************************************************/
00083 
00084         this (char[] name, ushort port1, ushort port2, bool request = false)
00085         {
00086                 this.name    = name;
00087                 this.port1   = port1;
00088                 this.port2   = port2;
00089                 this.request = request;
00090         }
00091 
00092         /**********************************************************************
00093 
00094         **********************************************************************/
00095 
00096         void read (IReader reader)
00097         {
00098                 super.read (reader);
00099                 reader.get (name)
00100                       .get (port1)
00101                       .get (port2)
00102                       .get (request);
00103         }
00104 
00105         /**********************************************************************
00106 
00107         **********************************************************************/
00108 
00109         void write (IWriter writer)
00110         {
00111                 super.write (writer);
00112                 writer.put  (name)
00113                       .put  (port1)
00114                       .put  (port2)
00115                       .put  (request);
00116         }
00117 
00118         /**********************************************************************
00119 
00120         **********************************************************************/
00121 
00122         override Payload create ()
00123         {
00124                 return new RollCall;
00125         }
00126 
00127         /**********************************************************************
00128 
00129         **********************************************************************/
00130 
00131         override char[] getGuid ()
00132         {
00133                 return this.classinfo.name;
00134         }
00135 }
00136 
00137 

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