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annotate deps/Platinum/ThirdParty/Neptune/Source/Core/NptMessaging.h @ 0:3425707ddbf6

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author fraserofthenight
date Mon, 06 Jul 2009 08:06:28 -0700
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1 /*****************************************************************
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2 |
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3 | Neptune - Messaging System
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4 |
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5 | Copyright (c) 2002-2008, Axiomatic Systems, LLC.
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6 | All rights reserved.
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7 |
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8 | Redistribution and use in source and binary forms, with or without
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9 | modification, are permitted provided that the following conditions are met:
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10 | * Redistributions of source code must retain the above copyright
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11 | notice, this list of conditions and the following disclaimer.
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12 | * Redistributions in binary form must reproduce the above copyright
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13 | notice, this list of conditions and the following disclaimer in the
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14 | documentation and/or other materials provided with the distribution.
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15 | * Neither the name of Axiomatic Systems nor the
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16 | names of its contributors may be used to endorse or promote products
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17 | derived from this software without specific prior written permission.
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18 |
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19 | THIS SOFTWARE IS PROVIDED BY AXIOMATIC SYSTEMS ''AS IS'' AND ANY
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20 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 | DISCLAIMED. IN NO EVENT SHALL AXIOMATIC SYSTEMS BE LIABLE FOR ANY
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23 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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24 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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25 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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26 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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27 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 |
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30 ****************************************************************/
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31
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32 #ifndef _NPT_MESSAGING_H_
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33 #define _NPT_MESSAGING_H_
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34
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35 /*----------------------------------------------------------------------
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36 | includes
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37 +---------------------------------------------------------------------*/
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38 #include "NptConstants.h"
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39 #include "NptTypes.h"
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40 #include "NptResults.h"
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41 #include "NptList.h"
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42
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43 /*----------------------------------------------------------------------
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44 | forward references
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45 +---------------------------------------------------------------------*/
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46 class NPT_Message;
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47
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48 /*----------------------------------------------------------------------
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49 | NPT_MessageHandler
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50 +---------------------------------------------------------------------*/
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51 class NPT_MessageHandler
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52 {
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53 public:
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54 // methods
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55 virtual ~NPT_MessageHandler() {}
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56
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57 // default message handler
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58 virtual void OnMessage(NPT_Message*) {}
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59
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60 // this method is a central point of handling for received messages.
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61 // it can be overloaded by subclasses who wish to process all
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62 // incoming messages
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63 virtual NPT_Result HandleMessage(NPT_Message* message);
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64 };
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65
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66 /*----------------------------------------------------------------------
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67 | NPT_Messsage
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68 +---------------------------------------------------------------------*/
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69 class NPT_Message
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70 {
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71 public:
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72 // types
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73 typedef const char* Type;
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74
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75 // static members
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76 static Type MessageType;
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77
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78 // methods
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79 virtual ~NPT_Message() {}
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80 virtual Type GetType() { return MessageType; }
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81 virtual NPT_Result Dispatch(NPT_MessageHandler* handler) {
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82 return DefaultDeliver(handler);
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83 }
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84 // this method should really be called 'Deliver', but this would
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85 // cause a problem when subclasses overload it
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86 virtual NPT_Result DefaultDeliver(NPT_MessageHandler* handler) {
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87 handler->OnMessage(this);
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88 return NPT_SUCCESS;
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89 }
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90 };
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91
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92 /*----------------------------------------------------------------------
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93 | NPT_TerminateMesssage
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94 +---------------------------------------------------------------------*/
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95 class NPT_TerminateMessage : public NPT_Message
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96 {
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97 public:
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98 // methods
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99 NPT_Result Dispatch(NPT_MessageHandler* /*handler*/) {
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100 return NPT_ERROR_TERMINATED;
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101 }
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102 };
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103
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104 /*----------------------------------------------------------------------
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105 | NPT_MessageQueue
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106 +---------------------------------------------------------------------*/
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107 class NPT_MessageQueue
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108 {
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109 public:
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110 // methods
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111 virtual ~NPT_MessageQueue() {}
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112 virtual NPT_Result PumpMessage(NPT_Timeout timeout = NPT_TIMEOUT_INFINITE) = 0;
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113 virtual NPT_Result QueueMessage(NPT_Message* message,
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114 NPT_MessageHandler* handler) = 0;
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115 };
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116
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117 /*----------------------------------------------------------------------
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118 | NPT_MessageReceiver
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119 +---------------------------------------------------------------------*/
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120 class NPT_MessageReceiver
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121 {
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122 public:
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123 // methods
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124 NPT_MessageReceiver() : m_Queue(NULL), m_Handler(NULL) {}
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125 NPT_MessageReceiver(NPT_MessageHandler* handler) :
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126 m_Queue(NULL), m_Handler(handler) {}
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127 NPT_MessageReceiver(NPT_MessageQueue* queue) :
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128 m_Queue(queue), m_Handler(NULL) {}
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129 NPT_MessageReceiver(NPT_MessageHandler* handler,
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130 NPT_MessageQueue* queue) :
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131 m_Queue(queue), m_Handler(handler) {}
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132 virtual ~NPT_MessageReceiver() {}
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133 NPT_Result SetQueue(NPT_MessageQueue* queue) {
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134 m_Queue = queue;
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135 return NPT_SUCCESS;
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136 }
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137 NPT_Result SetHandler(NPT_MessageHandler* handler) {
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138 m_Handler = handler;
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139 return NPT_SUCCESS;
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140 }
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141 virtual NPT_Result PostMessage(NPT_Message* message) {
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142 if (m_Queue) {
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143 return m_Queue->QueueMessage(message, m_Handler);
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144 } else {
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145 return NPT_FAILURE;
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146 }
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147 }
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148
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149 protected:
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150 // members
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151 NPT_MessageQueue* m_Queue;
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152 NPT_MessageHandler* m_Handler;
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153 };
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154
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155 /*----------------------------------------------------------------------
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156 | NPT_MessageBroadcaster
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157 +---------------------------------------------------------------------*/
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158 class NPT_MessageBroadcaster
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159 {
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160 public:
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161 // methods
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162 NPT_MessageBroadcaster(NPT_Message* message) : m_Message(message) {}
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163 NPT_Result operator()(NPT_MessageReceiver*& receiver) const {
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164 receiver->PostMessage(m_Message);
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165 return NPT_SUCCESS;
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166 }
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167
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168 private:
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169 // members
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170 NPT_Message* m_Message;
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171 };
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172
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
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173 #endif // _NPT_MESSAGING_H_