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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         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032         
00033         @version        Initial version, July 2004      
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.cluster.qos.socket.RollCall;
00040 
00041 private import mango.cache.Payload;
00042 
00043 /******************************************************************************
00044 
00045         An IPayload used by the cluster client and server during discovery 
00046         lookup and liveness broadcasts. The client broadcasts one of these
00047         at startup to see which servers are alive. The server responds with
00048         a reply RollCall stating its name and port. The server will also
00049         broadcast one of these when it first starts, such that any running
00050         clients can tell the server has 'recovered'.
00051          
00052 ******************************************************************************/
00053 
00054 class RollCall : Payload
00055 {
00056         char[]  name;
00057         int     port1,
00058                 port2;
00059         bool    request;
00060 
00061         private import mango.io.PickleRegistry;
00062 
00063         /***********************************************************************
00064         
00065                 Register this class for pickling, so we can resurrect
00066                 instances when they arrive on a network datagram.
00067 
00068         ***********************************************************************/
00069 
00070         static this ()
00071         {
00072                 PickleRegistry.enroll (new RollCall);
00073         }
00074 
00075         /**********************************************************************
00076 
00077         **********************************************************************/
00078 
00079         this ()
00080         {
00081         }
00082 
00083         /**********************************************************************
00084 
00085         **********************************************************************/
00086 
00087         this (char[] name, ushort port1, ushort port2, bool request = false)
00088         {
00089                 this.name    = name;
00090                 this.port1   = port1;
00091                 this.port2   = port2;
00092                 this.request = request;
00093         }
00094 
00095         /**********************************************************************
00096 
00097         **********************************************************************/
00098 
00099         void read (IReader reader)
00100         {
00101                 super.read (reader);
00102                 reader.get (name)
00103                       .get (port1)
00104                       .get (port2)
00105                       .get (request);
00106         }
00107 
00108         /**********************************************************************
00109 
00110         **********************************************************************/
00111 
00112         void write (IWriter writer)
00113         {
00114                 super.write (writer);
00115                 writer.put  (name)
00116                       .put  (port1)
00117                       .put  (port2)
00118                       .put  (request);
00119         }
00120 
00121         /**********************************************************************
00122 
00123         **********************************************************************/
00124 
00125         override Payload create ()
00126         {
00127                 return new RollCall;
00128         }
00129 
00130         /**********************************************************************
00131 
00132         **********************************************************************/
00133 
00134         override char[] getGuid ()
00135         {
00136                 return this.classinfo.name;
00137         }
00138 }
00139 
00140 

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