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8 <h1>examples/Base/IPC/Async/Fibonacci3/Fibonacci3.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).</span> |
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9 <a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span> |
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10 <a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span> |
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11 <a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span> |
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12 <a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span> |
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13 <a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span> |
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14 <a name="l00007"></a>00007 <span class="comment">//</span> |
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15 <a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span> |
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16 <a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span> |
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17 <a name="l00010"></a>00010 <span class="comment">//</span> |
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18 <a name="l00011"></a>00011 <span class="comment">// Contributors:</span> |
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19 <a name="l00012"></a>00012 <span class="comment">//</span> |
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20 <a name="l00013"></a>00013 <span class="comment">// Description:</span> |
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21 <a name="l00014"></a>00014 <span class="comment">// Example wraps a console in an active object and performs the </span> |
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22 <a name="l00015"></a>00015 <span class="comment">// Fibonacci calculation as a background active object.</span> |
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23 <a name="l00016"></a>00016 <span class="comment">// The technique used is similar to, but not identical, to that used by CIdle, where</span> |
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24 <a name="l00017"></a>00017 <span class="comment">// the background active object is repeatedly called provided the other (higher priority)</span> |
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25 <a name="l00018"></a>00018 <span class="comment">// active objects are not ready to run. </span> |
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26 <a name="l00019"></a>00019 <span class="comment">// Fibonacci Active Objects example</span> |
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27 <a name="l00020"></a>00020 <span class="comment">//</span> |
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28 <a name="l00021"></a>00021 |
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29 <a name="l00022"></a>00022 <span class="preprocessor">#include <e32cons.h></span> |
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30 <a name="l00023"></a>00023 <span class="preprocessor">#include <e32base.h></span> |
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31 <a name="l00024"></a>00024 <span class="preprocessor">#include <e32std.h></span> |
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32 <a name="l00025"></a>00025 |
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33 <a name="l00027"></a>00027 <span class="comment">//nclude <e32hal.h></span> |
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34 <a name="l00028"></a>00028 |
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35 <a name="l00029"></a>00029 |
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36 <a name="l00030"></a>00030 LOCAL_D CConsoleBase* <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>; |
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37 <a name="l00031"></a>00031 |
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38 <a name="l00032"></a>00032 _LIT(KTxtMainInstructions,<span class="stringliteral">"\n\nPress 'F' to start\n 'ESC' to exit\n 'C' to cancel, anytime\n"</span>); |
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39 <a name="l00033"></a>00033 |
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40 <a name="l00035"></a>00035 <span class="comment">//</span> |
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41 <a name="l00036"></a>00036 <span class="comment">// -----> CActiveConsole (definition)</span> |
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42 <a name="l00037"></a>00037 <span class="comment">//</span> |
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43 <a name="l00038"></a>00038 <span class="comment">// An abstract class which provides the facility to issue key requests. </span> |
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44 <a name="l00039"></a>00039 <span class="comment">//</span> |
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45 <a name="l00041"></a>00041 <span class="comment"></span><span class="keyword">class </span>CActiveConsole : <span class="keyword">public</span> CActive |
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46 <a name="l00042"></a>00042 { |
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47 <a name="l00043"></a>00043 <span class="keyword">public</span>: |
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48 <a name="l00044"></a>00044 <span class="comment">// Construction</span> |
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49 <a name="l00045"></a>00045 CActiveConsole(CConsoleBase* aConsole); |
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50 <a name="l00046"></a>00046 <span class="keywordtype">void</span> ConstructL(); |
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51 <a name="l00047"></a>00047 |
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52 <a name="l00048"></a>00048 <span class="comment">// Destruction</span> |
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53 <a name="l00049"></a>00049 ~CActiveConsole(); |
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54 <a name="l00050"></a>00050 |
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55 <a name="l00051"></a>00051 <span class="comment">// Issue request</span> |
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56 <a name="l00052"></a>00052 <span class="keywordtype">void</span> RequestCharacter(); |
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57 <a name="l00053"></a>00053 |
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58 <a name="l00054"></a>00054 <span class="comment">// Cancel request.</span> |
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59 <a name="l00055"></a>00055 <span class="comment">// Defined as pure virtual by CActive;</span> |
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60 <a name="l00056"></a>00056 <span class="comment">// implementation provided by this class.</span> |
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61 <a name="l00057"></a>00057 <span class="keywordtype">void</span> DoCancel(); |
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62 <a name="l00058"></a>00058 |
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63 <a name="l00059"></a>00059 <span class="comment">// Service completed request.</span> |
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64 <a name="l00060"></a>00060 <span class="comment">// Defined as pure virtual by CActive;</span> |
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65 <a name="l00061"></a>00061 <span class="comment">// implementation provided by this class,</span> |
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66 <a name="l00062"></a>00062 <span class="keywordtype">void</span> RunL(); |
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67 <a name="l00063"></a>00063 |
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68 <a name="l00064"></a>00064 <span class="comment">// Called from RunL() - an implementation must be provided</span> |
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69 <a name="l00065"></a>00065 <span class="comment">// by derived classes to handle the completed request</span> |
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70 <a name="l00066"></a>00066 <span class="keyword">virtual</span> <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) = 0; |
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71 <a name="l00067"></a>00067 |
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72 <a name="l00068"></a>00068 <span class="keyword">protected</span>: |
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73 <a name="l00069"></a>00069 <span class="comment">// Data members defined by this class</span> |
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74 <a name="l00070"></a>00070 CConsoleBase* iConsole; <span class="comment">// A console for reading from</span> |
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75 <a name="l00071"></a>00071 }; |
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76 <a name="l00072"></a>00072 |
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77 <a name="l00073"></a>00073 |
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78 <a name="l00075"></a>00075 <span class="comment">//</span> |
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79 <a name="l00076"></a>00076 <span class="comment">// -----> CExampleScheduler (definition)</span> |
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80 <a name="l00077"></a>00077 <span class="comment">//</span> |
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81 <a name="l00079"></a>00079 <span class="comment"></span><span class="keyword">class </span>CActiveConsole; |
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82 <a name="l00080"></a>00080 |
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83 <a name="l00081"></a>00081 <span class="keyword">class </span>CExampleScheduler : <span class="keyword">public</span> CActiveScheduler |
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84 <a name="l00082"></a>00082 { |
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85 <a name="l00083"></a>00083 <span class="keyword">public</span>: |
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86 <a name="l00084"></a>00084 <span class="keywordtype">void</span> Error (TInt aError) <span class="keyword">const</span>; |
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87 <a name="l00085"></a>00085 <span class="keywordtype">void</span> WaitForAnyRequest(); |
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88 <a name="l00086"></a>00086 <span class="keywordtype">void</span> SetActiveObject(CActiveConsole* aActiveConsole); |
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89 <a name="l00087"></a>00087 <span class="keyword">private</span>: |
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90 <a name="l00088"></a>00088 <span class="comment">// data members defined for this class</span> |
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91 <a name="l00089"></a>00089 CActiveConsole* iActiveConsole; |
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92 <a name="l00090"></a>00090 }; |
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93 <a name="l00091"></a>00091 |
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94 <a name="l00092"></a>00092 |
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95 <a name="l00093"></a>00093 |
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96 <a name="l00095"></a>00095 <span class="comment">//</span> |
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97 <a name="l00096"></a>00096 <span class="comment">// -----> CFibonacciEngine (definition)</span> |
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98 <a name="l00097"></a>00097 <span class="comment">//</span> |
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99 <a name="l00098"></a>00098 <span class="comment">// This class provides the fibonacci calculation engine</span> |
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100 <a name="l00099"></a>00099 <span class="comment">//</span> |
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101 <a name="l00101"></a>00101 <span class="comment"></span> |
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102 <a name="l00102"></a>00102 <span class="keyword">class </span>CFibonacciEngine : <span class="keyword">public</span> CBase |
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103 <a name="l00103"></a>00103 { |
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104 <a name="l00104"></a>00104 <span class="keyword">public</span>: |
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105 <a name="l00105"></a>00105 CFibonacciEngine() ; |
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106 <a name="l00106"></a>00106 <span class="keywordtype">void</span> StartCalculate (TInt aTerms) ; |
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107 <a name="l00107"></a>00107 <span class="keywordtype">void</span> StepCalculate () ; |
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108 <a name="l00108"></a>00108 |
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109 <a name="l00109"></a>00109 TUint iResult ; |
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110 <a name="l00110"></a>00110 |
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111 <a name="l00111"></a>00111 <span class="keyword">enum</span> TEngineState {eInactive, eCalculating, eCompleted} ; |
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112 <a name="l00112"></a>00112 TEngineState iState ; |
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113 <a name="l00113"></a>00113 |
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114 <a name="l00114"></a>00114 <span class="keyword">private</span>: |
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115 <a name="l00115"></a>00115 TUint iCurrentTotal ; |
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116 <a name="l00116"></a>00116 TUint iPreviousTotal ; |
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117 <a name="l00117"></a>00117 TInt iTermsLeftToDo ; |
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118 <a name="l00118"></a>00118 } ; |
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119 <a name="l00119"></a>00119 |
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120 <a name="l00120"></a>00120 |
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121 <a name="l00122"></a>00122 <span class="comment">//</span> |
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122 <a name="l00123"></a>00123 <span class="comment">// -----> CFibonacciApplication (definition)</span> |
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123 <a name="l00124"></a>00124 <span class="comment">//</span> |
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124 <a name="l00125"></a>00125 <span class="comment">// This class encapsulates the fibonacci thread that runs the fibonacci engine</span> |
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125 <a name="l00126"></a>00126 <span class="comment">//</span> |
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126 <a name="l00128"></a>00128 <span class="comment"></span> |
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127 <a name="l00129"></a>00129 <span class="keyword">class </span>CFibonacciApplication : <span class="keyword">public</span> CActive |
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128 <a name="l00130"></a>00130 { |
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129 <a name="l00131"></a>00131 <span class="keyword">public</span>: |
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130 <a name="l00132"></a>00132 CFibonacciApplication(CConsoleBase* aConsole, CFibonacciEngine* aFibonacciEngine) ; |
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131 <a name="l00133"></a>00133 ~CFibonacciApplication() ; |
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132 <a name="l00134"></a>00134 |
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133 <a name="l00135"></a>00135 <span class="keywordtype">void</span> CalculateFibonacci(TInt aIterations) ; |
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134 <a name="l00136"></a>00136 |
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135 <a name="l00137"></a>00137 <span class="keyword">private</span>: |
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136 <a name="l00138"></a>00138 <span class="keywordtype">void</span> DoCancel() ; |
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137 <a name="l00139"></a>00139 <span class="keywordtype">void</span> RunL() ; |
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138 <a name="l00140"></a>00140 |
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139 <a name="l00141"></a>00141 <span class="keyword">private</span>: |
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140 <a name="l00142"></a>00142 CConsoleBase* iConsole ; |
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141 <a name="l00143"></a>00143 CFibonacciEngine* iFibonacciEngine ; |
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142 <a name="l00144"></a>00144 } ; |
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143 <a name="l00145"></a>00145 |
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144 <a name="l00146"></a>00146 |
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145 <a name="l00148"></a>00148 <span class="comment">//</span> |
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146 <a name="l00149"></a>00149 <span class="comment">// -----> CFibonacciKeyHandler (definition)</span> |
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147 <a name="l00150"></a>00150 <span class="comment">//</span> |
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148 <a name="l00151"></a>00151 <span class="comment">// This class encapsulates the fibonacci keyboard handler</span> |
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149 <a name="l00152"></a>00152 <span class="comment">//</span> |
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150 <a name="l00154"></a>00154 <span class="comment"></span> |
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151 <a name="l00155"></a>00155 <span class="keyword">class </span>CFibonacciKeyHandler : <span class="keyword">public</span> CActiveConsole |
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152 <a name="l00156"></a>00156 { |
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153 <a name="l00157"></a>00157 <span class="keyword">public</span>: |
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154 <a name="l00158"></a>00158 CFibonacciKeyHandler( CConsoleBase* aConsole, |
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155 <a name="l00159"></a>00159 CFibonacciApplication* aApplication) ; |
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156 <a name="l00160"></a>00160 <span class="keywordtype">void</span> ConstructL(); |
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157 <a name="l00161"></a>00161 |
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158 <a name="l00162"></a>00162 <span class="comment">// Static construction</span> |
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159 <a name="l00163"></a>00163 <span class="keyword">static</span> CFibonacciKeyHandler* NewLC(CConsoleBase* aConsole, CFibonacciApplication* aHandler) ; |
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160 <a name="l00164"></a>00164 |
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161 <a name="l00165"></a>00165 <span class="comment">// service request</span> |
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162 <a name="l00166"></a>00166 <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) ; |
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163 <a name="l00167"></a>00167 |
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164 <a name="l00168"></a>00168 <span class="keyword">private</span>: |
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165 <a name="l00169"></a>00169 CConsoleBase* iConsole ; |
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166 <a name="l00170"></a>00170 CFibonacciApplication* iApplication ; |
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167 <a name="l00171"></a>00171 }; |
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168 <a name="l00172"></a>00172 |
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169 <a name="l00173"></a>00173 |
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170 <a name="l00175"></a>00175 <span class="comment">//</span> |
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171 <a name="l00176"></a>00176 <span class="comment">// -----> CActiveConsole (implementation)</span> |
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172 <a name="l00177"></a>00177 <span class="comment">//</span> |
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173 <a name="l00179"></a>00179 <span class="comment"></span>CActiveConsole::CActiveConsole( CConsoleBase* aConsole) |
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174 <a name="l00180"></a>00180 : CActive(CActive::EPriorityUserInput) |
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175 <a name="l00181"></a>00181 <span class="comment">// Construct high-priority active object</span> |
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176 <a name="l00182"></a>00182 { |
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177 <a name="l00183"></a>00183 iConsole = aConsole; |
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178 <a name="l00184"></a>00184 __DECLARE_NAME(_S(<span class="stringliteral">"CActiveConsole"</span>)); |
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179 <a name="l00185"></a>00185 |
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180 <a name="l00186"></a>00186 } |
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181 <a name="l00187"></a>00187 |
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182 <a name="l00188"></a>00188 <span class="keywordtype">void</span> CActiveConsole::ConstructL() |
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183 <a name="l00189"></a>00189 { |
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184 <a name="l00190"></a>00190 <span class="comment">// Add to active scheduler</span> |
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185 <a name="l00191"></a>00191 CActiveScheduler::Add(<span class="keyword">this</span>); |
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186 <a name="l00192"></a>00192 } |
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187 <a name="l00193"></a>00193 |
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188 <a name="l00194"></a>00194 CActiveConsole::~CActiveConsole() |
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189 <a name="l00195"></a>00195 { |
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190 <a name="l00196"></a>00196 <span class="comment">// Make sure we're cancelled</span> |
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191 <a name="l00197"></a>00197 Cancel(); |
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192 <a name="l00198"></a>00198 } |
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193 <a name="l00199"></a>00199 |
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194 <a name="l00200"></a>00200 <span class="keywordtype">void</span> CActiveConsole::DoCancel() |
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195 <a name="l00201"></a>00201 { |
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196 <a name="l00202"></a>00202 iConsole->ReadCancel(); |
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197 <a name="l00203"></a>00203 } |
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198 <a name="l00204"></a>00204 |
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199 <a name="l00205"></a>00205 <span class="keywordtype">void</span> CActiveConsole::RunL() |
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200 <a name="l00206"></a>00206 { |
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201 <a name="l00207"></a>00207 <span class="comment">// Handle completed request</span> |
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202 <a name="l00208"></a>00208 ProcessKeyPress(TChar(iConsole->KeyCode())); |
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203 <a name="l00209"></a>00209 } |
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204 <a name="l00210"></a>00210 |
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205 <a name="l00211"></a>00211 <span class="keywordtype">void</span> CActiveConsole::RequestCharacter() |
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206 <a name="l00212"></a>00212 { |
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207 <a name="l00213"></a>00213 <span class="comment">// A request is issued to the CConsoleBase to accept a</span> |
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208 <a name="l00214"></a>00214 <span class="comment">// character from the keyboard.</span> |
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209 <a name="l00215"></a>00215 iConsole->Read(iStatus); |
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210 <a name="l00216"></a>00216 SetActive(); |
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211 <a name="l00217"></a>00217 } |
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212 <a name="l00218"></a>00218 |
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213 <a name="l00219"></a>00219 |
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214 <a name="l00221"></a>00221 <span class="comment">//</span> |
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215 <a name="l00222"></a>00222 <span class="comment">// -----> CExampleScheduler (implementation)</span> |
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216 <a name="l00223"></a>00223 <span class="comment">//</span> |
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217 <a name="l00225"></a>00225 <span class="comment"></span><span class="keywordtype">void</span> CExampleScheduler::Error(TInt aError)<span class="keyword"> const</span> |
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218 <a name="l00226"></a>00226 <span class="keyword"> </span>{ |
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219 <a name="l00227"></a>00227 _LIT(KTxtSchedulerError,<span class="stringliteral">"CExampleScheduler - error"</span>); |
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220 <a name="l00228"></a>00228 User::Panic(KTxtSchedulerError,aError); |
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221 <a name="l00229"></a>00229 } |
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222 <a name="l00230"></a>00230 |
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223 <a name="l00231"></a>00231 |
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224 <a name="l00232"></a>00232 <span class="keywordtype">void</span> CExampleScheduler::WaitForAnyRequest() |
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225 <a name="l00233"></a>00233 { |
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226 <a name="l00234"></a>00234 <span class="keywordflow">if</span> (!(iActiveConsole->IsActive())) |
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227 <a name="l00235"></a>00235 iActiveConsole->RequestCharacter(); |
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228 <a name="l00236"></a>00236 CActiveScheduler::WaitForAnyRequest(); |
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229 <a name="l00237"></a>00237 } |
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230 <a name="l00238"></a>00238 |
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231 <a name="l00239"></a>00239 <span class="keywordtype">void</span> CExampleScheduler::SetActiveObject(CActiveConsole* aActiveConsole) |
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232 <a name="l00240"></a>00240 { |
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233 <a name="l00241"></a>00241 iActiveConsole = aActiveConsole; |
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234 <a name="l00242"></a>00242 } |
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235 <a name="l00243"></a>00243 |
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236 <a name="l00244"></a>00244 |
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237 <a name="l00245"></a>00245 |
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238 <a name="l00247"></a>00247 <span class="comment">// CFibonacciKeyHandler support routine</span> |
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239 <a name="l00248"></a>00248 <span class="comment">// uses up arrow & down arrow to change number, Enter to select</span> |
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240 <a name="l00250"></a>00250 <span class="comment"></span> |
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241 <a name="l00251"></a>00251 TInt GetValueFromKeyboard (TInt aInitial, TInt aStep, TInt lowerLimit, TInt upperLimit, <span class="keyword">const</span> TDesC& aPrompt, CConsoleBase* aConsole) |
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242 <a name="l00252"></a>00252 { |
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243 <a name="l00253"></a>00253 TChar input ; |
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244 <a name="l00254"></a>00254 TInt value = aInitial ; |
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245 <a name="l00255"></a>00255 |
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246 <a name="l00256"></a>00256 aConsole->Printf(aPrompt) ; |
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247 <a name="l00257"></a>00257 <span class="keywordflow">do</span> |
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248 <a name="l00258"></a>00258 { |
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249 <a name="l00259"></a>00259 aConsole->SetPos(0); |
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250 <a name="l00260"></a>00260 _LIT(KFormat1,<span class="stringliteral">"%d "</span>); |
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251 <a name="l00261"></a>00261 aConsole->Printf(KFormat1, value); |
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252 <a name="l00262"></a>00262 input = aConsole->Getch() ; |
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253 <a name="l00263"></a>00263 <span class="keywordflow">if</span> (input == EKeyUpArrow && value < upperLimit) value = value + aStep ; |
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254 <a name="l00264"></a>00264 <span class="keywordflow">if</span> (input == EKeyDownArrow && value > lowerLimit) value = value - aStep ; |
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255 <a name="l00265"></a>00265 } |
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256 <a name="l00266"></a>00266 <span class="keywordflow">while</span> (input != EKeyEnter) ; |
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257 <a name="l00267"></a>00267 |
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258 <a name="l00268"></a>00268 <span class="keywordflow">return</span> value ; |
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259 <a name="l00269"></a>00269 } |
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260 <a name="l00270"></a>00270 |
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261 <a name="l00271"></a>00271 |
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262 <a name="l00273"></a>00273 <span class="comment">//</span> |
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263 <a name="l00274"></a>00274 <span class="comment">// -----> CFibonacciKeyHandler (implementation)</span> |
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264 <a name="l00275"></a>00275 <span class="comment">//</span> |
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265 <a name="l00277"></a>00277 <span class="comment"></span> |
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266 <a name="l00278"></a>00278 CFibonacciKeyHandler::CFibonacciKeyHandler(CConsoleBase* aConsole, CFibonacciApplication* aApplication) |
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267 <a name="l00279"></a>00279 : CActiveConsole(aConsole) |
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268 <a name="l00280"></a>00280 <span class="comment">// construct zero-priority active object</span> |
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269 <a name="l00281"></a>00281 { |
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270 <a name="l00282"></a>00282 iConsole = aConsole ; |
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271 <a name="l00283"></a>00283 iApplication = aApplication ; |
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272 <a name="l00284"></a>00284 |
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273 <a name="l00285"></a>00285 __DECLARE_NAME(_S(<span class="stringliteral">"CFibonacciApplication"</span>)); |
|
274 <a name="l00286"></a>00286 <span class="comment">// Add to active scheduler</span> |
|
275 <a name="l00287"></a>00287 CActiveScheduler::Add(<span class="keyword">this</span>); |
|
276 <a name="l00288"></a>00288 <span class="comment">// Make this the active object</span> |
|
277 <a name="l00289"></a>00289 ((CExampleScheduler*)(CActiveScheduler::Current()))->SetActiveObject(<span class="keyword">this</span>); |
|
278 <a name="l00290"></a>00290 } |
|
279 <a name="l00291"></a>00291 |
|
280 <a name="l00292"></a>00292 |
|
281 <a name="l00293"></a>00293 <span class="keywordtype">void</span> CFibonacciKeyHandler::ProcessKeyPress(TChar aChar) |
|
282 <a name="l00294"></a>00294 { |
|
283 <a name="l00295"></a>00295 <span class="comment">// if key is ESC, cancel any outstanding request & stop the scheduler</span> |
|
284 <a name="l00296"></a>00296 <span class="keywordflow">if</span> (aChar == EKeyEscape) |
|
285 <a name="l00297"></a>00297 { |
|
286 <a name="l00298"></a>00298 CActiveScheduler::Stop(); |
|
287 <a name="l00299"></a>00299 <span class="keywordflow">return</span>; |
|
288 <a name="l00300"></a>00300 } |
|
289 <a name="l00301"></a>00301 |
|
290 <a name="l00302"></a>00302 <span class="comment">// If key is "f" or "F", issue a Fibonacci request if none is in progress</span> |
|
291 <a name="l00303"></a>00303 <span class="keywordflow">if</span> (aChar == <span class="charliteral">'f'</span> || aChar == <span class="charliteral">'F'</span>) |
|
292 <a name="l00304"></a>00304 { |
|
293 <a name="l00305"></a>00305 <span class="keywordflow">if</span> (!(iApplication->IsActive())) |
|
294 <a name="l00306"></a>00306 { |
|
295 <a name="l00307"></a>00307 _LIT(KTxtReturnTermNumber,<span class="stringliteral">"\nENTER selects num\nUP arrow increases num\nDOWN arrow decreases num\n\n"</span>); |
|
296 <a name="l00308"></a>00308 TInt iterations = GetValueFromKeyboard(5,1,2,46, KTxtReturnTermNumber, iConsole) ; |
|
297 <a name="l00309"></a>00309 iApplication->CalculateFibonacci(iterations); |
|
298 <a name="l00310"></a>00310 } |
|
299 <a name="l00311"></a>00311 <span class="keywordflow">else</span> |
|
300 <a name="l00312"></a>00312 { |
|
301 <a name="l00313"></a>00313 _LIT(KTxtAlreadyInProgress,<span class="stringliteral">"[Already in progress]"</span>); |
|
302 <a name="l00314"></a>00314 iConsole->Printf(KTxtAlreadyInProgress); |
|
303 <a name="l00315"></a>00315 } |
|
304 <a name="l00316"></a>00316 <span class="keywordflow">return</span>; |
|
305 <a name="l00317"></a>00317 } |
|
306 <a name="l00318"></a>00318 |
|
307 <a name="l00319"></a>00319 <span class="comment">// If key is "c" or "C", cancel any outstanding request </span> |
|
308 <a name="l00320"></a>00320 <span class="keywordflow">if</span> (aChar == <span class="charliteral">'c'</span> || aChar == <span class="charliteral">'C'</span>) |
|
309 <a name="l00321"></a>00321 { |
|
310 <a name="l00322"></a>00322 _LIT(KTxtCancelFibonacci,<span class="stringliteral">"\nCancelling Fibonacci.... \n"</span>); |
|
311 <a name="l00323"></a>00323 iConsole->Printf(KTxtCancelFibonacci); |
|
312 <a name="l00324"></a>00324 iApplication->Cancel(); |
|
313 <a name="l00325"></a>00325 iConsole->Printf(KTxtMainInstructions); |
|
314 <a name="l00326"></a>00326 <span class="keywordflow">return</span>; |
|
315 <a name="l00327"></a>00327 } |
|
316 <a name="l00328"></a>00328 |
|
317 <a name="l00329"></a>00329 _LIT(KTxtNotRecognised,<span class="stringliteral">"\nUnwanted key pressed"</span>); |
|
318 <a name="l00330"></a>00330 iConsole->Printf(KTxtNotRecognised); |
|
319 <a name="l00331"></a>00331 iConsole->Printf(KTxtMainInstructions); |
|
320 <a name="l00332"></a>00332 } |
|
321 <a name="l00333"></a>00333 |
|
322 <a name="l00334"></a>00334 |
|
323 <a name="l00336"></a>00336 <span class="comment">//</span> |
|
324 <a name="l00337"></a>00337 <span class="comment">// -----> CFibonacciApplication (implementation)</span> |
|
325 <a name="l00338"></a>00338 <span class="comment">//</span> |
|
326 <a name="l00340"></a>00340 <span class="comment"></span> |
|
327 <a name="l00341"></a>00341 CFibonacciApplication::CFibonacciApplication(CConsoleBase* aConsole, CFibonacciEngine* aFibonacciEngine) |
|
328 <a name="l00342"></a>00342 <span class="comment">//</span> |
|
329 <a name="l00343"></a>00343 <span class="comment">// Constructor</span> |
|
330 <a name="l00344"></a>00344 <span class="comment">//</span> |
|
331 <a name="l00345"></a>00345 : CActive(EPriorityStandard) |
|
332 <a name="l00346"></a>00346 { |
|
333 <a name="l00347"></a>00347 iConsole = aConsole ; |
|
334 <a name="l00348"></a>00348 iFibonacciEngine = aFibonacciEngine ; |
|
335 <a name="l00349"></a>00349 CActiveScheduler::Add(<span class="keyword">this</span>); |
|
336 <a name="l00350"></a>00350 __DECLARE_NAME(_S(<span class="stringliteral">"CFibonacciApplication"</span>)); |
|
337 <a name="l00351"></a>00351 }; |
|
338 <a name="l00352"></a>00352 |
|
339 <a name="l00353"></a>00353 |
|
340 <a name="l00354"></a>00354 <span class="comment">// destructor</span> |
|
341 <a name="l00355"></a>00355 CFibonacciApplication::~CFibonacciApplication() |
|
342 <a name="l00356"></a>00356 { |
|
343 <a name="l00357"></a>00357 <span class="comment">// cancel any requests and tell server </span> |
|
344 <a name="l00358"></a>00358 Cancel() ; |
|
345 <a name="l00359"></a>00359 } |
|
346 <a name="l00360"></a>00360 |
|
347 <a name="l00361"></a>00361 |
|
348 <a name="l00362"></a>00362 <span class="keywordtype">void</span> CFibonacciApplication::DoCancel() |
|
349 <a name="l00363"></a>00363 { |
|
350 <a name="l00364"></a>00364 <span class="comment">// cancel the active object request </span> |
|
351 <a name="l00365"></a>00365 iFibonacciEngine->iState = CFibonacciEngine::eInactive ; |
|
352 <a name="l00366"></a>00366 } |
|
353 <a name="l00367"></a>00367 |
|
354 <a name="l00368"></a>00368 |
|
355 <a name="l00369"></a>00369 |
|
356 <a name="l00370"></a>00370 <span class="comment">// initiate a request</span> |
|
357 <a name="l00371"></a>00371 <span class="keywordtype">void</span> CFibonacciApplication::CalculateFibonacci(TInt aIterations) |
|
358 <a name="l00372"></a>00372 { |
|
359 <a name="l00373"></a>00373 <span class="comment">// initialize engine</span> |
|
360 <a name="l00374"></a>00374 <span class="comment">// no neeed to set iStatus to KRequestPending, as request completes below</span> |
|
361 <a name="l00375"></a>00375 iFibonacciEngine->StartCalculate(aIterations) ; |
|
362 <a name="l00376"></a>00376 |
|
363 <a name="l00377"></a>00377 <span class="comment">// schedule the request</span> |
|
364 <a name="l00378"></a>00378 SetActive() ; |
|
365 <a name="l00379"></a>00379 |
|
366 <a name="l00380"></a>00380 <span class="comment">// send signal that this request has completed</span> |
|
367 <a name="l00381"></a>00381 TRequestStatus* status = &iStatus ; |
|
368 <a name="l00382"></a>00382 User::RequestComplete(status, KErrNone) ; |
|
369 <a name="l00383"></a>00383 } |
|
370 <a name="l00384"></a>00384 |
|
371 <a name="l00385"></a>00385 |
|
372 <a name="l00386"></a>00386 |
|
373 <a name="l00387"></a>00387 <span class="keywordtype">void</span> CFibonacciApplication::RunL() |
|
374 <a name="l00388"></a>00388 <span class="comment">// implements a simple state engine: {eInactive, eCalculating, eCompleted}</span> |
|
375 <a name="l00389"></a>00389 { |
|
376 <a name="l00390"></a>00390 <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eInactive ) |
|
377 <a name="l00391"></a>00391 { |
|
378 <a name="l00392"></a>00392 _LIT(KTxtEngineNotInitialized,<span class="stringliteral">"Engine not initialized"</span>); |
|
379 <a name="l00393"></a>00393 User::Panic(KTxtEngineNotInitialized, KErrNotReady) ; |
|
380 <a name="l00394"></a>00394 } |
|
381 <a name="l00395"></a>00395 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eCalculating ) |
|
382 <a name="l00396"></a>00396 { |
|
383 <a name="l00397"></a>00397 <span class="comment">// unnecessary - just provides feedback on progression of the calculation</span> |
|
384 <a name="l00398"></a>00398 _LIT(KTxtDot,<span class="stringliteral">"."</span>); |
|
385 <a name="l00399"></a>00399 iConsole->Printf(KTxtDot) ; |
|
386 <a name="l00400"></a>00400 |
|
387 <a name="l00401"></a>00401 <span class="comment">// no neeed to set iStatus to KRequestPending, as request completes below</span> |
|
388 <a name="l00402"></a>00402 |
|
389 <a name="l00403"></a>00403 <span class="comment">// request next step</span> |
|
390 <a name="l00404"></a>00404 iFibonacciEngine->StepCalculate() ; |
|
391 <a name="l00405"></a>00405 |
|
392 <a name="l00406"></a>00406 <span class="comment">// schedule request</span> |
|
393 <a name="l00407"></a>00407 SetActive() ; |
|
394 <a name="l00408"></a>00408 |
|
395 <a name="l00409"></a>00409 <span class="comment">// send signal that this request has completed</span> |
|
396 <a name="l00410"></a>00410 TRequestStatus* status = &iStatus ; |
|
397 <a name="l00411"></a>00411 User::RequestComplete(status, KErrNone) ; |
|
398 <a name="l00412"></a>00412 } |
|
399 <a name="l00413"></a>00413 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eCompleted ) |
|
400 <a name="l00414"></a>00414 { |
|
401 <a name="l00415"></a>00415 <span class="comment">// finished calculation: print result and reset state engine</span> |
|
402 <a name="l00416"></a>00416 _LIT(KFormat2,<span class="stringliteral">"\n Result : %u \n"</span>); <span class="comment">//not used</span> |
|
403 <a name="l00417"></a>00417 iConsole->Printf(KFormat2, iFibonacciEngine->iResult) ; |
|
404 <a name="l00418"></a>00418 iConsole->Printf(KTxtMainInstructions) ; |
|
405 <a name="l00419"></a>00419 iFibonacciEngine->iState = CFibonacciEngine::eInactive ; |
|
406 <a name="l00420"></a>00420 } |
|
407 <a name="l00421"></a>00421 } |
|
408 <a name="l00422"></a>00422 |
|
409 <a name="l00423"></a>00423 |
|
410 <a name="l00424"></a>00424 |
|
411 <a name="l00426"></a>00426 <span class="comment">//</span> |
|
412 <a name="l00427"></a>00427 <span class="comment">// -----> CFibonacciEngine (implementation)</span> |
|
413 <a name="l00428"></a>00428 <span class="comment">//</span> |
|
414 <a name="l00430"></a>00430 <span class="comment"></span>CFibonacciEngine::CFibonacciEngine() |
|
415 <a name="l00431"></a>00431 { |
|
416 <a name="l00432"></a>00432 iState = eInactive ; |
|
417 <a name="l00433"></a>00433 } |
|
418 <a name="l00434"></a>00434 |
|
419 <a name="l00435"></a>00435 |
|
420 <a name="l00436"></a>00436 <span class="keywordtype">void</span> CFibonacciEngine::StartCalculate (TInt aTerms) |
|
421 <a name="l00437"></a>00437 { |
|
422 <a name="l00438"></a>00438 <span class="comment">// initialise all internal variables to initial state</span> |
|
423 <a name="l00439"></a>00439 iCurrentTotal = 1 ; |
|
424 <a name="l00440"></a>00440 iPreviousTotal = 0 ; |
|
425 <a name="l00441"></a>00441 iResult = 0 ; |
|
426 <a name="l00442"></a>00442 iTermsLeftToDo = aTerms + 1 ; <span class="comment">// first step completed in variable initialization</span> |
|
427 <a name="l00443"></a>00443 iState = eCalculating ; |
|
428 <a name="l00444"></a>00444 } |
|
429 <a name="l00445"></a>00445 |
|
430 <a name="l00446"></a>00446 |
|
431 <a name="l00447"></a>00447 |
|
432 <a name="l00448"></a>00448 <span class="keywordtype">void</span> CFibonacciEngine::StepCalculate () |
|
433 <a name="l00449"></a>00449 { |
|
434 <a name="l00450"></a>00450 |
|
435 <a name="l00451"></a>00451 <span class="comment">// if full calculation not yet complete, but in progress (i.e. not cancelled)</span> |
|
436 <a name="l00452"></a>00452 <span class="keywordflow">if</span> (--iTermsLeftToDo > 0 && iState == eCalculating) |
|
437 <a name="l00453"></a>00453 { |
|
438 <a name="l00454"></a>00454 <span class="comment">// calculate next number in series</span> |
|
439 <a name="l00455"></a>00455 TInt newTotal = iCurrentTotal + iPreviousTotal ; |
|
440 <a name="l00456"></a>00456 |
|
441 <a name="l00457"></a>00457 <span class="comment">// update internal variables</span> |
|
442 <a name="l00458"></a>00458 iPreviousTotal = iCurrentTotal ; |
|
443 <a name="l00459"></a>00459 iCurrentTotal = newTotal ; |
|
444 <a name="l00460"></a>00460 |
|
445 <a name="l00461"></a>00461 <span class="comment">// introduce a delay to make us a long-running service</span> |
|
446 <a name="l00462"></a>00462 User::After(1000000) ; |
|
447 <a name="l00463"></a>00463 |
|
448 <a name="l00464"></a>00464 <span class="comment">// not necessary, but allows running total to be used during the calculation</span> |
|
449 <a name="l00465"></a>00465 <span class="comment">// (say for putting values into a chart or graph)</span> |
|
450 <a name="l00466"></a>00466 iResult = iCurrentTotal ; |
|
451 <a name="l00467"></a>00467 } |
|
452 <a name="l00468"></a>00468 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iTermsLeftToDo <= 0) |
|
453 <a name="l00469"></a>00469 { |
|
454 <a name="l00470"></a>00470 <span class="comment">// flag that calculation has finished and ensure final result is available</span> |
|
455 <a name="l00471"></a>00471 iState = eCompleted ; |
|
456 <a name="l00472"></a>00472 iResult = iCurrentTotal ; |
|
457 <a name="l00473"></a>00473 } |
|
458 <a name="l00474"></a>00474 } |
|
459 <a name="l00475"></a>00475 |
|
460 <a name="l00476"></a>00476 |
|
461 <a name="l00477"></a>00477 |
|
462 <a name="l00479"></a>00479 <span class="comment">// This section deals with initialisation and ensuring we have a console active</span> |
|
463 <a name="l00481"></a>00481 <span class="comment"></span> |
|
464 <a name="l00482"></a>00482 <span class="keywordtype">void</span> doExampleL () ; |
|
465 <a name="l00483"></a>00483 |
|
466 <a name="l00484"></a>00484 <span class="keywordtype">void</span> SetupConsoleL(); |
|
467 <a name="l00485"></a>00485 |
|
468 <a name="l00486"></a>00486 GLDEF_C TInt <a class="code" href="dbllist_8cpp.html#0f358e9c4355138f629b8c4f37310295">E32Main</a>() <span class="comment">// main function called by E32</span> |
|
469 <a name="l00487"></a>00487 { |
|
470 <a name="l00488"></a>00488 CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span> |
|
471 <a name="l00489"></a>00489 TRAPD(<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>,SetupConsoleL()); <span class="comment">// more initialization, then do example</span> |
|
472 <a name="l00490"></a>00490 _LIT(KTxtFibonacciExampleError,<span class="stringliteral">"Fibonacci example error"</span>); |
|
473 <a name="l00491"></a>00491 __ASSERT_ALWAYS(!<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>,User::Panic(KTxtFibonacciExampleError,<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>)); |
|
474 <a name="l00492"></a>00492 <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span> |
|
475 <a name="l00493"></a>00493 <span class="keywordflow">return</span> 0; <span class="comment">// and return</span> |
|
476 <a name="l00494"></a>00494 } |
|
477 <a name="l00495"></a>00495 |
|
478 <a name="l00496"></a>00496 <span class="keywordtype">void</span> SetupConsoleL() <span class="comment">// initialize and call example code under cleanup stack</span> |
|
479 <a name="l00497"></a>00497 { |
|
480 <a name="l00498"></a>00498 _LIT(KTxtFibActObjBackground,<span class="stringliteral">"Background Active Object"</span>); |
|
481 <a name="l00499"></a>00499 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>=Console::NewL(KTxtFibActObjBackground, TSize(KConsFullScreen,KConsFullScreen)); |
|
482 <a name="l00500"></a>00500 CleanupStack::PushL(<a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>); |
|
483 <a name="l00501"></a>00501 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtMainInstructions) ; |
|
484 <a name="l00502"></a>00502 TRAPD(<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>, doExampleL()); <span class="comment">// perform example function</span> |
|
485 <a name="l00503"></a>00503 <span class="keywordflow">if</span> (<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>) |
|
486 <a name="l00504"></a>00504 { |
|
487 <a name="l00505"></a>00505 _LIT(KFormat3,<span class="stringliteral">"failed: leave code=%d"</span>); |
|
488 <a name="l00506"></a>00506 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KFormat3, <a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>); |
|
489 <a name="l00507"></a>00507 } |
|
490 <a name="l00508"></a>00508 _LIT(KTxtPressAnyKey,<span class="stringliteral">"[Press any key to exit]"</span>); |
|
491 <a name="l00509"></a>00509 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtPressAnyKey); |
|
492 <a name="l00510"></a>00510 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Getch(); <span class="comment">// get and ignore character</span> |
|
493 <a name="l00511"></a>00511 CleanupStack::PopAndDestroy(); <span class="comment">// close console</span> |
|
494 <a name="l00512"></a>00512 } |
|
495 <a name="l00513"></a>00513 |
|
496 <a name="l00514"></a>00514 |
|
497 <a name="l00516"></a>00516 <span class="comment">//</span> |
|
498 <a name="l00517"></a>00517 <span class="comment">// Do the example</span> |
|
499 <a name="l00518"></a>00518 <span class="comment">//</span> |
|
500 <a name="l00520"></a>00520 <span class="comment"></span><span class="keywordtype">void</span> doExampleL() |
|
501 <a name="l00521"></a>00521 { |
|
502 <a name="l00522"></a>00522 <span class="comment">// Construct and install the active scheduler; push onto the cleanup stack</span> |
|
503 <a name="l00523"></a>00523 CExampleScheduler* exampleScheduler = <span class="keyword">new</span> (ELeave) CExampleScheduler; |
|
504 <a name="l00524"></a>00524 CleanupStack::PushL(exampleScheduler); |
|
505 <a name="l00525"></a>00525 |
|
506 <a name="l00526"></a>00526 <span class="comment">// Install as the active scheduler</span> |
|
507 <a name="l00527"></a>00527 CActiveScheduler::Install(exampleScheduler); |
|
508 <a name="l00528"></a>00528 |
|
509 <a name="l00529"></a>00529 <span class="comment">// Create CFibonacciEngine active object; push onto the cleanup stack</span> |
|
510 <a name="l00530"></a>00530 CFibonacciEngine* fibEngine = <span class="keyword">new</span> (ELeave) CFibonacciEngine ; |
|
511 <a name="l00531"></a>00531 CleanupStack::PushL(fibEngine); |
|
512 <a name="l00532"></a>00532 |
|
513 <a name="l00533"></a>00533 <span class="comment">// Create CFibonacciApplication handler active object; push onto the cleanup stack</span> |
|
514 <a name="l00534"></a>00534 CFibonacciApplication* fibApplication = <span class="keyword">new</span> CFibonacciApplication(<a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>, fibEngine); |
|
515 <a name="l00535"></a>00535 CleanupStack::PushL(fibApplication); |
|
516 <a name="l00536"></a>00536 |
|
517 <a name="l00537"></a>00537 <span class="comment">// Create CFibonacciKeyHandler active object; push onto the cleanup stack</span> |
|
518 <a name="l00538"></a>00538 CFibonacciKeyHandler* fibKeyHandler = <span class="keyword">new</span> CFibonacciKeyHandler(<a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>, fibApplication); |
|
519 <a name="l00539"></a>00539 CleanupStack::PushL(fibKeyHandler); |
|
520 <a name="l00540"></a>00540 |
|
521 <a name="l00541"></a>00541 <span class="comment">// issue initial request</span> |
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522 <a name="l00542"></a>00542 fibKeyHandler->RequestCharacter() ; |
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523 <a name="l00543"></a>00543 |
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524 <a name="l00544"></a>00544 <span class="comment">// Main part of the program:</span> |
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525 <a name="l00545"></a>00545 <span class="comment">// wait loop that cycles until ActiveScheduler::Stop called</span> |
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526 <a name="l00546"></a>00546 CActiveScheduler::Start(); |
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527 <a name="l00547"></a>00547 |
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528 <a name="l00548"></a>00548 <span class="comment">// Remove items from the cleanup stack and destroy them</span> |
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529 <a name="l00549"></a>00549 CleanupStack::PopAndDestroy(4); |
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530 <a name="l00550"></a>00550 } |
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531 <a name="l00551"></a>00551 |
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532 <a name="l00552"></a>00552 |
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533 </pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:32:56 2010 for TB10.1 Example Applications by |
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534 <a href="http://www.doxygen.org/index.html"> |
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535 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address> |
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536 </body> |
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537 </html> |