00001 /******************************************************************************* 00002 00003 @file Payload.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, April 2004 00034 @author Kris 00035 00036 00037 *******************************************************************************/ 00038 00039 module mango.cache.Payload; 00040 00041 public import mango.cache.model.IPayload; 00042 00043 /****************************************************************************** 00044 00045 Base-class for entries placed into both the cache and cluster 00046 framework 00047 00048 ******************************************************************************/ 00049 00050 class Payload : IPayload 00051 { 00052 private ulong time; 00053 00054 /********************************************************************** 00055 00056 Destroy this payload. Often used to return instances to a 00057 freelist, or otherwise release resources. 00058 00059 **********************************************************************/ 00060 00061 void destroy () 00062 { 00063 } 00064 00065 /*********************************************************************** 00066 00067 Return the timestamp associated with this payload 00068 00069 ***********************************************************************/ 00070 00071 long getTime () 00072 { 00073 return time; 00074 } 00075 00076 /*********************************************************************** 00077 00078 Set the timestamp of this payload 00079 00080 ***********************************************************************/ 00081 00082 void setTime (long time) 00083 { 00084 this.time = time; 00085 } 00086 00087 /********************************************************************** 00088 00089 Recover the timestamp from the provided reader 00090 00091 **********************************************************************/ 00092 00093 void read (IReader reader) 00094 { 00095 reader.get (time); 00096 } 00097 00098 /********************************************************************** 00099 00100 Emit our timestamp to the provided writer 00101 00102 **********************************************************************/ 00103 00104 void write (IWriter writer) 00105 { 00106 writer.put (time); 00107 } 00108 00109 /*********************************************************************** 00110 00111 Create a new instance of a payload, and populate it via 00112 read() using the specified reader 00113 00114 ***********************************************************************/ 00115 00116 Object create (IReader reader) 00117 { 00118 Payload r = cast(Payload) create (); 00119 r.read (reader); 00120 return r; 00121 } 00122 00123 /********************************************************************** 00124 00125 Overridable create method that simply instantiates a 00126 new instance. May be used to allocate subclassses from 00127 a freelist 00128 00129 **********************************************************************/ 00130 00131 Object create () 00132 { 00133 return new Payload; 00134 } 00135 00136 /********************************************************************** 00137 00138 Return the guid for this payload. This should be unique 00139 per payload class, if said class is used in conjunction 00140 with the clustering facilities. Inspected by the Pickle 00141 utilitiy classes. 00142 00143 **********************************************************************/ 00144 00145 char[] getGuid () 00146 { 00147 return this.classinfo.name; 00148 } 00149 } 00150 00151