Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_fibonacci3_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<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>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">// Example wraps a console in an active object and performs the </span>
<a name="l00015"></a>00015 <span class="comment">// Fibonacci calculation as a background active object.</span>
<a name="l00016"></a>00016 <span class="comment">// The technique used is similar to, but not identical, to that used by CIdle, where</span>
<a name="l00017"></a>00017 <span class="comment">// the background active object is repeatedly called provided the other (higher priority)</span>
<a name="l00018"></a>00018 <span class="comment">// active objects are not ready to run. </span>
<a name="l00019"></a>00019 <span class="comment">// Fibonacci Active Objects example</span>
<a name="l00020"></a>00020 <span class="comment">//</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include <e32cons.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <e32base.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <e32std.h></span>
<a name="l00025"></a>00025
<a name="l00027"></a>00027 <span class="comment">//nclude <e32hal.h></span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029
<a name="l00030"></a>00030 LOCAL_D CConsoleBase* console;
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtMainInstructions,<span class="stringliteral">"\n\nPress 'F' to start\n 'ESC' to exit\n 'C' to cancel, anytime\n"</span>);
<a name="l00033"></a>00033
<a name="l00035"></a>00035 <span class="comment">//</span>
<a name="l00036"></a>00036 <span class="comment">// -----> CActiveConsole (definition)</span>
<a name="l00037"></a>00037 <span class="comment">//</span>
<a name="l00038"></a>00038 <span class="comment">// An abstract class which provides the facility to issue key requests. </span>
<a name="l00039"></a>00039 <span class="comment">//</span>
<a name="l00041"></a>00041 <span class="comment"></span><span class="keyword">class </span>CActiveConsole : <span class="keyword">public</span> CActive
<a name="l00042"></a>00042 {
<a name="l00043"></a>00043 <span class="keyword">public</span>:
<a name="l00044"></a>00044 <span class="comment">// Construction</span>
<a name="l00045"></a>00045 CActiveConsole(CConsoleBase* aConsole);
<a name="l00046"></a>00046 <span class="keywordtype">void</span> ConstructL();
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="comment">// Destruction</span>
<a name="l00049"></a>00049 ~CActiveConsole();
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">// Issue request</span>
<a name="l00052"></a>00052 <span class="keywordtype">void</span> RequestCharacter();
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">// Cancel request.</span>
<a name="l00055"></a>00055 <span class="comment">// Defined as pure virtual by CActive;</span>
<a name="l00056"></a>00056 <span class="comment">// implementation provided by this class.</span>
<a name="l00057"></a>00057 <span class="keywordtype">void</span> DoCancel();
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">// Service completed request.</span>
<a name="l00060"></a>00060 <span class="comment">// Defined as pure virtual by CActive;</span>
<a name="l00061"></a>00061 <span class="comment">// implementation provided by this class,</span>
<a name="l00062"></a>00062 <span class="keywordtype">void</span> RunL();
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">// Called from RunL() - an implementation must be provided</span>
<a name="l00065"></a>00065 <span class="comment">// by derived classes to handle the completed request</span>
<a name="l00066"></a>00066 <span class="keyword">virtual</span> <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) = 0;
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keyword">protected</span>:
<a name="l00069"></a>00069 <span class="comment">// Data members defined by this class</span>
<a name="l00070"></a>00070 CConsoleBase* iConsole; <span class="comment">// A console for reading from</span>
<a name="l00071"></a>00071 };
<a name="l00072"></a>00072
<a name="l00073"></a>00073
<a name="l00075"></a>00075 <span class="comment">//</span>
<a name="l00076"></a>00076 <span class="comment">// -----> CExampleScheduler (definition)</span>
<a name="l00077"></a>00077 <span class="comment">//</span>
<a name="l00079"></a>00079 <span class="comment"></span><span class="keyword">class </span>CActiveConsole;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="keyword">class </span>CExampleScheduler : <span class="keyword">public</span> CActiveScheduler
<a name="l00082"></a>00082 {
<a name="l00083"></a>00083 <span class="keyword">public</span>:
<a name="l00084"></a>00084 <span class="keywordtype">void</span> Error (TInt aError) <span class="keyword">const</span>;
<a name="l00085"></a>00085 <span class="keywordtype">void</span> WaitForAnyRequest();
<a name="l00086"></a>00086 <span class="keywordtype">void</span> SetActiveObject(CActiveConsole* aActiveConsole);
<a name="l00087"></a>00087 <span class="keyword">private</span>:
<a name="l00088"></a>00088 <span class="comment">// data members defined for this class</span>
<a name="l00089"></a>00089 CActiveConsole* iActiveConsole;
<a name="l00090"></a>00090 };
<a name="l00091"></a>00091
<a name="l00092"></a>00092
<a name="l00093"></a>00093
<a name="l00095"></a>00095 <span class="comment">//</span>
<a name="l00096"></a>00096 <span class="comment">// -----> CFibonacciEngine (definition)</span>
<a name="l00097"></a>00097 <span class="comment">//</span>
<a name="l00098"></a>00098 <span class="comment">// This class provides the fibonacci calculation engine</span>
<a name="l00099"></a>00099 <span class="comment">//</span>
<a name="l00101"></a>00101 <span class="comment"></span>
<a name="l00102"></a>00102 <span class="keyword">class </span>CFibonacciEngine : <span class="keyword">public</span> CBase
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 <span class="keyword">public</span>:
<a name="l00105"></a>00105 CFibonacciEngine() ;
<a name="l00106"></a>00106 <span class="keywordtype">void</span> StartCalculate (TInt aTerms) ;
<a name="l00107"></a>00107 <span class="keywordtype">void</span> StepCalculate () ;
<a name="l00108"></a>00108
<a name="l00109"></a>00109 TUint iResult ;
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="keyword">enum</span> TEngineState {eInactive, eCalculating, eCompleted} ;
<a name="l00112"></a>00112 TEngineState iState ;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keyword">private</span>:
<a name="l00115"></a>00115 TUint iCurrentTotal ;
<a name="l00116"></a>00116 TUint iPreviousTotal ;
<a name="l00117"></a>00117 TInt iTermsLeftToDo ;
<a name="l00118"></a>00118 } ;
<a name="l00119"></a>00119
<a name="l00120"></a>00120
<a name="l00122"></a>00122 <span class="comment">//</span>
<a name="l00123"></a>00123 <span class="comment">// -----> CFibonacciApplication (definition)</span>
<a name="l00124"></a>00124 <span class="comment">//</span>
<a name="l00125"></a>00125 <span class="comment">// This class encapsulates the fibonacci thread that runs the fibonacci engine</span>
<a name="l00126"></a>00126 <span class="comment">//</span>
<a name="l00128"></a>00128 <span class="comment"></span>
<a name="l00129"></a>00129 <span class="keyword">class </span>CFibonacciApplication : <span class="keyword">public</span> CActive
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131 <span class="keyword">public</span>:
<a name="l00132"></a>00132 CFibonacciApplication(CConsoleBase* aConsole, CFibonacciEngine* aFibonacciEngine) ;
<a name="l00133"></a>00133 ~CFibonacciApplication() ;
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="keywordtype">void</span> CalculateFibonacci(TInt aIterations) ;
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keyword">private</span>:
<a name="l00138"></a>00138 <span class="keywordtype">void</span> DoCancel() ;
<a name="l00139"></a>00139 <span class="keywordtype">void</span> RunL() ;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keyword">private</span>:
<a name="l00142"></a>00142 CConsoleBase* iConsole ;
<a name="l00143"></a>00143 CFibonacciEngine* iFibonacciEngine ;
<a name="l00144"></a>00144 } ;
<a name="l00145"></a>00145
<a name="l00146"></a>00146
<a name="l00148"></a>00148 <span class="comment">//</span>
<a name="l00149"></a>00149 <span class="comment">// -----> CFibonacciKeyHandler (definition)</span>
<a name="l00150"></a>00150 <span class="comment">//</span>
<a name="l00151"></a>00151 <span class="comment">// This class encapsulates the fibonacci keyboard handler</span>
<a name="l00152"></a>00152 <span class="comment">//</span>
<a name="l00154"></a>00154 <span class="comment"></span>
<a name="l00155"></a>00155 <span class="keyword">class </span>CFibonacciKeyHandler : <span class="keyword">public</span> CActiveConsole
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="keyword">public</span>:
<a name="l00158"></a>00158 CFibonacciKeyHandler( CConsoleBase* aConsole,
<a name="l00159"></a>00159 CFibonacciApplication* aApplication) ;
<a name="l00160"></a>00160 <span class="keywordtype">void</span> ConstructL();
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">// Static construction</span>
<a name="l00163"></a>00163 <span class="keyword">static</span> CFibonacciKeyHandler* NewLC(CConsoleBase* aConsole, CFibonacciApplication* aHandler) ;
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="comment">// service request</span>
<a name="l00166"></a>00166 <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) ;
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keyword">private</span>:
<a name="l00169"></a>00169 CConsoleBase* iConsole ;
<a name="l00170"></a>00170 CFibonacciApplication* iApplication ;
<a name="l00171"></a>00171 };
<a name="l00172"></a>00172
<a name="l00173"></a>00173
<a name="l00175"></a>00175 <span class="comment">//</span>
<a name="l00176"></a>00176 <span class="comment">// -----> CActiveConsole (implementation)</span>
<a name="l00177"></a>00177 <span class="comment">//</span>
<a name="l00179"></a>00179 <span class="comment"></span>CActiveConsole::CActiveConsole( CConsoleBase* aConsole)
<a name="l00180"></a>00180 : CActive(CActive::EPriorityUserInput)
<a name="l00181"></a>00181 <span class="comment">// Construct high-priority active object</span>
<a name="l00182"></a>00182 {
<a name="l00183"></a>00183 iConsole = aConsole;
<a name="l00184"></a>00184 __DECLARE_NAME(_S(<span class="stringliteral">"CActiveConsole"</span>));
<a name="l00185"></a>00185
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="keywordtype">void</span> CActiveConsole::ConstructL()
<a name="l00189"></a>00189 {
<a name="l00190"></a>00190 <span class="comment">// Add to active scheduler</span>
<a name="l00191"></a>00191 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 CActiveConsole::~CActiveConsole()
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 <span class="comment">// Make sure we're cancelled</span>
<a name="l00197"></a>00197 Cancel();
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199
<a name="l00200"></a>00200 <span class="keywordtype">void</span> CActiveConsole::DoCancel()
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 iConsole->ReadCancel();
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="keywordtype">void</span> CActiveConsole::RunL()
<a name="l00206"></a>00206 {
<a name="l00207"></a>00207 <span class="comment">// Handle completed request</span>
<a name="l00208"></a>00208 ProcessKeyPress(TChar(iConsole->KeyCode()));
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210
<a name="l00211"></a>00211 <span class="keywordtype">void</span> CActiveConsole::RequestCharacter()
<a name="l00212"></a>00212 {
<a name="l00213"></a>00213 <span class="comment">// A request is issued to the CConsoleBase to accept a</span>
<a name="l00214"></a>00214 <span class="comment">// character from the keyboard.</span>
<a name="l00215"></a>00215 iConsole->Read(iStatus);
<a name="l00216"></a>00216 SetActive();
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218
<a name="l00219"></a>00219
<a name="l00221"></a>00221 <span class="comment">//</span>
<a name="l00222"></a>00222 <span class="comment">// -----> CExampleScheduler (implementation)</span>
<a name="l00223"></a>00223 <span class="comment">//</span>
<a name="l00225"></a>00225 <span class="comment"></span><span class="keywordtype">void</span> CExampleScheduler::Error(TInt aError)<span class="keyword"> const</span>
<a name="l00226"></a>00226 <span class="keyword"> </span>{
<a name="l00227"></a>00227 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtSchedulerError,<span class="stringliteral">"CExampleScheduler - error"</span>);
<a name="l00228"></a>00228 User::Panic(KTxtSchedulerError,aError);
<a name="l00229"></a>00229 }
<a name="l00230"></a>00230
<a name="l00231"></a>00231
<a name="l00232"></a>00232 <span class="keywordtype">void</span> CExampleScheduler::WaitForAnyRequest()
<a name="l00233"></a>00233 {
<a name="l00234"></a>00234 <span class="keywordflow">if</span> (!(iActiveConsole->IsActive()))
<a name="l00235"></a>00235 iActiveConsole->RequestCharacter();
<a name="l00236"></a>00236 CActiveScheduler::WaitForAnyRequest();
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="keywordtype">void</span> CExampleScheduler::SetActiveObject(CActiveConsole* aActiveConsole)
<a name="l00240"></a>00240 {
<a name="l00241"></a>00241 iActiveConsole = aActiveConsole;
<a name="l00242"></a>00242 }
<a name="l00243"></a>00243
<a name="l00244"></a>00244
<a name="l00245"></a>00245
<a name="l00247"></a>00247 <span class="comment">// CFibonacciKeyHandler support routine</span>
<a name="l00248"></a>00248 <span class="comment">// uses up arrow & down arrow to change number, Enter to select</span>
<a name="l00250"></a>00250 <span class="comment"></span>
<a name="l00251"></a>00251 TInt GetValueFromKeyboard (TInt aInitial, TInt aStep, TInt lowerLimit, TInt upperLimit, <span class="keyword">const</span> TDesC& aPrompt, CConsoleBase* aConsole)
<a name="l00252"></a>00252 {
<a name="l00253"></a>00253 TChar input ;
<a name="l00254"></a>00254 TInt value = aInitial ;
<a name="l00255"></a>00255
<a name="l00256"></a>00256 aConsole->Printf(aPrompt) ;
<a name="l00257"></a>00257 <span class="keywordflow">do</span>
<a name="l00258"></a>00258 {
<a name="l00259"></a>00259 aConsole->SetPos(0);
<a name="l00260"></a>00260 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat1,<span class="stringliteral">"%d "</span>);
<a name="l00261"></a>00261 aConsole->Printf(KFormat1, value);
<a name="l00262"></a>00262 input = aConsole->Getch() ;
<a name="l00263"></a>00263 <span class="keywordflow">if</span> (input == EKeyUpArrow && value < upperLimit) value = value + aStep ;
<a name="l00264"></a>00264 <span class="keywordflow">if</span> (input == EKeyDownArrow && value > lowerLimit) value = value - aStep ;
<a name="l00265"></a>00265 }
<a name="l00266"></a>00266 <span class="keywordflow">while</span> (input != EKeyEnter) ;
<a name="l00267"></a>00267
<a name="l00268"></a>00268 <span class="keywordflow">return</span> value ;
<a name="l00269"></a>00269 }
<a name="l00270"></a>00270
<a name="l00271"></a>00271
<a name="l00273"></a>00273 <span class="comment">//</span>
<a name="l00274"></a>00274 <span class="comment">// -----> CFibonacciKeyHandler (implementation)</span>
<a name="l00275"></a>00275 <span class="comment">//</span>
<a name="l00277"></a>00277 <span class="comment"></span>
<a name="l00278"></a>00278 CFibonacciKeyHandler::CFibonacciKeyHandler(CConsoleBase* aConsole, CFibonacciApplication* aApplication)
<a name="l00279"></a>00279 : CActiveConsole(aConsole)
<a name="l00280"></a>00280 <span class="comment">// construct zero-priority active object</span>
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 iConsole = aConsole ;
<a name="l00283"></a>00283 iApplication = aApplication ;
<a name="l00284"></a>00284
<a name="l00285"></a>00285 __DECLARE_NAME(_S(<span class="stringliteral">"CFibonacciApplication"</span>));
<a name="l00286"></a>00286 <span class="comment">// Add to active scheduler</span>
<a name="l00287"></a>00287 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00288"></a>00288 <span class="comment">// Make this the active object</span>
<a name="l00289"></a>00289 ((CExampleScheduler*)(CActiveScheduler::Current()))->SetActiveObject(<span class="keyword">this</span>);
<a name="l00290"></a>00290 }
<a name="l00291"></a>00291
<a name="l00292"></a>00292
<a name="l00293"></a>00293 <span class="keywordtype">void</span> CFibonacciKeyHandler::ProcessKeyPress(TChar aChar)
<a name="l00294"></a>00294 {
<a name="l00295"></a>00295 <span class="comment">// if key is ESC, cancel any outstanding request & stop the scheduler</span>
<a name="l00296"></a>00296 <span class="keywordflow">if</span> (aChar == EKeyEscape)
<a name="l00297"></a>00297 {
<a name="l00298"></a>00298 CActiveScheduler::Stop();
<a name="l00299"></a>00299 <span class="keywordflow">return</span>;
<a name="l00300"></a>00300 }
<a name="l00301"></a>00301
<a name="l00302"></a>00302 <span class="comment">// If key is "f" or "F", issue a Fibonacci request if none is in progress</span>
<a name="l00303"></a>00303 <span class="keywordflow">if</span> (aChar == <span class="charliteral">'f'</span> || aChar == <span class="charliteral">'F'</span>)
<a name="l00304"></a>00304 {
<a name="l00305"></a>00305 <span class="keywordflow">if</span> (!(iApplication->IsActive()))
<a name="l00306"></a>00306 {
<a name="l00307"></a>00307 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtReturnTermNumber,<span class="stringliteral">"\nENTER selects num\nUP arrow increases num\nDOWN arrow decreases num\n\n"</span>);
<a name="l00308"></a>00308 TInt iterations = GetValueFromKeyboard(5,1,2,46, KTxtReturnTermNumber, iConsole) ;
<a name="l00309"></a>00309 iApplication->CalculateFibonacci(iterations);
<a name="l00310"></a>00310 }
<a name="l00311"></a>00311 <span class="keywordflow">else</span>
<a name="l00312"></a>00312 {
<a name="l00313"></a>00313 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtAlreadyInProgress,<span class="stringliteral">"[Already in progress]"</span>);
<a name="l00314"></a>00314 iConsole->Printf(KTxtAlreadyInProgress);
<a name="l00315"></a>00315 }
<a name="l00316"></a>00316 <span class="keywordflow">return</span>;
<a name="l00317"></a>00317 }
<a name="l00318"></a>00318
<a name="l00319"></a>00319 <span class="comment">// If key is "c" or "C", cancel any outstanding request </span>
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (aChar == <span class="charliteral">'c'</span> || aChar == <span class="charliteral">'C'</span>)
<a name="l00321"></a>00321 {
<a name="l00322"></a>00322 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtCancelFibonacci,<span class="stringliteral">"\nCancelling Fibonacci.... \n"</span>);
<a name="l00323"></a>00323 iConsole->Printf(KTxtCancelFibonacci);
<a name="l00324"></a>00324 iApplication->Cancel();
<a name="l00325"></a>00325 iConsole->Printf(KTxtMainInstructions);
<a name="l00326"></a>00326 <span class="keywordflow">return</span>;
<a name="l00327"></a>00327 }
<a name="l00328"></a>00328
<a name="l00329"></a>00329 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtNotRecognised,<span class="stringliteral">"\nUnwanted key pressed"</span>);
<a name="l00330"></a>00330 iConsole->Printf(KTxtNotRecognised);
<a name="l00331"></a>00331 iConsole->Printf(KTxtMainInstructions);
<a name="l00332"></a>00332 }
<a name="l00333"></a>00333
<a name="l00334"></a>00334
<a name="l00336"></a>00336 <span class="comment">//</span>
<a name="l00337"></a>00337 <span class="comment">// -----> CFibonacciApplication (implementation)</span>
<a name="l00338"></a>00338 <span class="comment">//</span>
<a name="l00340"></a>00340 <span class="comment"></span>
<a name="l00341"></a>00341 CFibonacciApplication::CFibonacciApplication(CConsoleBase* aConsole, CFibonacciEngine* aFibonacciEngine)
<a name="l00342"></a>00342 <span class="comment">//</span>
<a name="l00343"></a>00343 <span class="comment">// Constructor</span>
<a name="l00344"></a>00344 <span class="comment">//</span>
<a name="l00345"></a>00345 : CActive(EPriorityStandard)
<a name="l00346"></a>00346 {
<a name="l00347"></a>00347 iConsole = aConsole ;
<a name="l00348"></a>00348 iFibonacciEngine = aFibonacciEngine ;
<a name="l00349"></a>00349 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00350"></a>00350 __DECLARE_NAME(_S(<span class="stringliteral">"CFibonacciApplication"</span>));
<a name="l00351"></a>00351 };
<a name="l00352"></a>00352
<a name="l00353"></a>00353
<a name="l00354"></a>00354 <span class="comment">// destructor</span>
<a name="l00355"></a>00355 CFibonacciApplication::~CFibonacciApplication()
<a name="l00356"></a>00356 {
<a name="l00357"></a>00357 <span class="comment">// cancel any requests and tell server </span>
<a name="l00358"></a>00358 Cancel() ;
<a name="l00359"></a>00359 }
<a name="l00360"></a>00360
<a name="l00361"></a>00361
<a name="l00362"></a>00362 <span class="keywordtype">void</span> CFibonacciApplication::DoCancel()
<a name="l00363"></a>00363 {
<a name="l00364"></a>00364 <span class="comment">// cancel the active object request </span>
<a name="l00365"></a>00365 iFibonacciEngine->iState = CFibonacciEngine::eInactive ;
<a name="l00366"></a>00366 }
<a name="l00367"></a>00367
<a name="l00368"></a>00368
<a name="l00369"></a>00369
<a name="l00370"></a>00370 <span class="comment">// initiate a request</span>
<a name="l00371"></a>00371 <span class="keywordtype">void</span> CFibonacciApplication::CalculateFibonacci(TInt aIterations)
<a name="l00372"></a>00372 {
<a name="l00373"></a>00373 <span class="comment">// initialize engine</span>
<a name="l00374"></a>00374 <span class="comment">// no neeed to set iStatus to KRequestPending, as request completes below</span>
<a name="l00375"></a>00375 iFibonacciEngine->StartCalculate(aIterations) ;
<a name="l00376"></a>00376
<a name="l00377"></a>00377 <span class="comment">// schedule the request</span>
<a name="l00378"></a>00378 SetActive() ;
<a name="l00379"></a>00379
<a name="l00380"></a>00380 <span class="comment">// send signal that this request has completed</span>
<a name="l00381"></a>00381 TRequestStatus* status = &iStatus ;
<a name="l00382"></a>00382 User::RequestComplete(status, KErrNone) ;
<a name="l00383"></a>00383 }
<a name="l00384"></a>00384
<a name="l00385"></a>00385
<a name="l00386"></a>00386
<a name="l00387"></a>00387 <span class="keywordtype">void</span> CFibonacciApplication::RunL()
<a name="l00388"></a>00388 <span class="comment">// implements a simple state engine: {eInactive, eCalculating, eCompleted}</span>
<a name="l00389"></a>00389 {
<a name="l00390"></a>00390 <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eInactive )
<a name="l00391"></a>00391 {
<a name="l00392"></a>00392 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtEngineNotInitialized,<span class="stringliteral">"Engine not initialized"</span>);
<a name="l00393"></a>00393 User::Panic(KTxtEngineNotInitialized, KErrNotReady) ;
<a name="l00394"></a>00394 }
<a name="l00395"></a>00395 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eCalculating )
<a name="l00396"></a>00396 {
<a name="l00397"></a>00397 <span class="comment">// unnecessary - just provides feedback on progression of the calculation</span>
<a name="l00398"></a>00398 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtDot,<span class="stringliteral">"."</span>);
<a name="l00399"></a>00399 iConsole->Printf(KTxtDot) ;
<a name="l00400"></a>00400
<a name="l00401"></a>00401 <span class="comment">// no neeed to set iStatus to KRequestPending, as request completes below</span>
<a name="l00402"></a>00402
<a name="l00403"></a>00403 <span class="comment">// request next step</span>
<a name="l00404"></a>00404 iFibonacciEngine->StepCalculate() ;
<a name="l00405"></a>00405
<a name="l00406"></a>00406 <span class="comment">// schedule request</span>
<a name="l00407"></a>00407 SetActive() ;
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="comment">// send signal that this request has completed</span>
<a name="l00410"></a>00410 TRequestStatus* status = &iStatus ;
<a name="l00411"></a>00411 User::RequestComplete(status, KErrNone) ;
<a name="l00412"></a>00412 }
<a name="l00413"></a>00413 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iFibonacciEngine->iState == CFibonacciEngine::eCompleted )
<a name="l00414"></a>00414 {
<a name="l00415"></a>00415 <span class="comment">// finished calculation: print result and reset state engine</span>
<a name="l00416"></a>00416 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat2,<span class="stringliteral">"\n Result : %u \n"</span>); <span class="comment">//not used</span>
<a name="l00417"></a>00417 iConsole->Printf(KFormat2, iFibonacciEngine->iResult) ;
<a name="l00418"></a>00418 iConsole->Printf(KTxtMainInstructions) ;
<a name="l00419"></a>00419 iFibonacciEngine->iState = CFibonacciEngine::eInactive ;
<a name="l00420"></a>00420 }
<a name="l00421"></a>00421 }
<a name="l00422"></a>00422
<a name="l00423"></a>00423
<a name="l00424"></a>00424
<a name="l00426"></a>00426 <span class="comment">//</span>
<a name="l00427"></a>00427 <span class="comment">// -----> CFibonacciEngine (implementation)</span>
<a name="l00428"></a>00428 <span class="comment">//</span>
<a name="l00430"></a>00430 <span class="comment"></span>CFibonacciEngine::CFibonacciEngine()
<a name="l00431"></a>00431 {
<a name="l00432"></a>00432 iState = eInactive ;
<a name="l00433"></a>00433 }
<a name="l00434"></a>00434
<a name="l00435"></a>00435
<a name="l00436"></a>00436 <span class="keywordtype">void</span> CFibonacciEngine::StartCalculate (TInt aTerms)
<a name="l00437"></a>00437 {
<a name="l00438"></a>00438 <span class="comment">// initialise all internal variables to initial state</span>
<a name="l00439"></a>00439 iCurrentTotal = 1 ;
<a name="l00440"></a>00440 iPreviousTotal = 0 ;
<a name="l00441"></a>00441 iResult = 0 ;
<a name="l00442"></a>00442 iTermsLeftToDo = aTerms + 1 ; <span class="comment">// first step completed in variable initialization</span>
<a name="l00443"></a>00443 iState = eCalculating ;
<a name="l00444"></a>00444 }
<a name="l00445"></a>00445
<a name="l00446"></a>00446
<a name="l00447"></a>00447
<a name="l00448"></a>00448 <span class="keywordtype">void</span> CFibonacciEngine::StepCalculate ()
<a name="l00449"></a>00449 {
<a name="l00450"></a>00450
<a name="l00451"></a>00451 <span class="comment">// if full calculation not yet complete, but in progress (i.e. not cancelled)</span>
<a name="l00452"></a>00452 <span class="keywordflow">if</span> (--iTermsLeftToDo > 0 && iState == eCalculating)
<a name="l00453"></a>00453 {
<a name="l00454"></a>00454 <span class="comment">// calculate next number in series</span>
<a name="l00455"></a>00455 TInt newTotal = iCurrentTotal + iPreviousTotal ;
<a name="l00456"></a>00456
<a name="l00457"></a>00457 <span class="comment">// update internal variables</span>
<a name="l00458"></a>00458 iPreviousTotal = iCurrentTotal ;
<a name="l00459"></a>00459 iCurrentTotal = newTotal ;
<a name="l00460"></a>00460
<a name="l00461"></a>00461 <span class="comment">// introduce a delay to make us a long-running service</span>
<a name="l00462"></a>00462 User::After(1000000) ;
<a name="l00463"></a>00463
<a name="l00464"></a>00464 <span class="comment">// not necessary, but allows running total to be used during the calculation</span>
<a name="l00465"></a>00465 <span class="comment">// (say for putting values into a chart or graph)</span>
<a name="l00466"></a>00466 iResult = iCurrentTotal ;
<a name="l00467"></a>00467 }
<a name="l00468"></a>00468 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iTermsLeftToDo <= 0)
<a name="l00469"></a>00469 {
<a name="l00470"></a>00470 <span class="comment">// flag that calculation has finished and ensure final result is available</span>
<a name="l00471"></a>00471 iState = eCompleted ;
<a name="l00472"></a>00472 iResult = iCurrentTotal ;
<a name="l00473"></a>00473 }
<a name="l00474"></a>00474 }
<a name="l00475"></a>00475
<a name="l00476"></a>00476
<a name="l00477"></a>00477
<a name="l00479"></a>00479 <span class="comment">// This section deals with initialisation and ensuring we have a console active</span>
<a name="l00481"></a>00481 <span class="comment"></span>
<a name="l00482"></a>00482 <span class="keywordtype">void</span> doExampleL () ;
<a name="l00483"></a>00483
<a name="l00484"></a>00484 <span class="keywordtype">void</span> SetupConsoleL();
<a name="l00485"></a>00485
<a name="l00486"></a>00486 GLDEF_C TInt E32Main() <span class="comment">// main function called by E32</span>
<a name="l00487"></a>00487 {
<a name="l00488"></a>00488 CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span>
<a name="l00489"></a>00489 TRAPD(error,SetupConsoleL()); <span class="comment">// more initialization, then do example</span>
<a name="l00490"></a>00490 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFibonacciExampleError,<span class="stringliteral">"Fibonacci example error"</span>);
<a name="l00491"></a>00491 __ASSERT_ALWAYS(!error,User::Panic(KTxtFibonacciExampleError,error));
<a name="l00492"></a>00492 <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span>
<a name="l00493"></a>00493 <span class="keywordflow">return</span> 0; <span class="comment">// and return</span>
<a name="l00494"></a>00494 }
<a name="l00495"></a>00495
<a name="l00496"></a>00496 <span class="keywordtype">void</span> SetupConsoleL() <span class="comment">// initialize and call example code under cleanup stack</span>
<a name="l00497"></a>00497 {
<a name="l00498"></a>00498 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFibActObjBackground,<span class="stringliteral">"Background Active Object"</span>);
<a name="l00499"></a>00499 console=Console::NewL(KTxtFibActObjBackground, TSize(KConsFullScreen,KConsFullScreen));
<a name="l00500"></a>00500 CleanupStack::PushL(console);
<a name="l00501"></a>00501 console->Printf(KTxtMainInstructions) ;
<a name="l00502"></a>00502 TRAPD(error, doExampleL()); <span class="comment">// perform example function</span>
<a name="l00503"></a>00503 <span class="keywordflow">if</span> (error)
<a name="l00504"></a>00504 {
<a name="l00505"></a>00505 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat3,<span class="stringliteral">"failed: leave code=%d"</span>);
<a name="l00506"></a>00506 console->Printf(KFormat3, error);
<a name="l00507"></a>00507 }
<a name="l00508"></a>00508 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtPressAnyKey,<span class="stringliteral">"[Press any key to exit]"</span>);
<a name="l00509"></a>00509 console->Printf(KTxtPressAnyKey);
<a name="l00510"></a>00510 console->Getch(); <span class="comment">// get and ignore character</span>
<a name="l00511"></a>00511 CleanupStack::PopAndDestroy(); <span class="comment">// close console</span>
<a name="l00512"></a>00512 }
<a name="l00513"></a>00513
<a name="l00514"></a>00514
<a name="l00516"></a>00516 <span class="comment">//</span>
<a name="l00517"></a>00517 <span class="comment">// Do the example</span>
<a name="l00518"></a>00518 <span class="comment">//</span>
<a name="l00520"></a>00520 <span class="comment"></span><span class="keywordtype">void</span> doExampleL()
<a name="l00521"></a>00521 {
<a name="l00522"></a>00522 <span class="comment">// Construct and install the active scheduler; push onto the cleanup stack</span>
<a name="l00523"></a>00523 CExampleScheduler* exampleScheduler = <span class="keyword">new</span> (ELeave) CExampleScheduler;
<a name="l00524"></a>00524 CleanupStack::PushL(exampleScheduler);
<a name="l00525"></a>00525
<a name="l00526"></a>00526 <span class="comment">// Install as the active scheduler</span>
<a name="l00527"></a>00527 CActiveScheduler::Install(exampleScheduler);
<a name="l00528"></a>00528
<a name="l00529"></a>00529 <span class="comment">// Create CFibonacciEngine active object; push onto the cleanup stack</span>
<a name="l00530"></a>00530 CFibonacciEngine* fibEngine = <span class="keyword">new</span> (ELeave) CFibonacciEngine ;
<a name="l00531"></a>00531 CleanupStack::PushL(fibEngine);
<a name="l00532"></a>00532
<a name="l00533"></a>00533 <span class="comment">// Create CFibonacciApplication handler active object; push onto the cleanup stack</span>
<a name="l00534"></a>00534 CFibonacciApplication* fibApplication = <span class="keyword">new</span> CFibonacciApplication(console, fibEngine);
<a name="l00535"></a>00535 CleanupStack::PushL(fibApplication);
<a name="l00536"></a>00536
<a name="l00537"></a>00537 <span class="comment">// Create CFibonacciKeyHandler active object; push onto the cleanup stack</span>
<a name="l00538"></a>00538 CFibonacciKeyHandler* fibKeyHandler = <span class="keyword">new</span> CFibonacciKeyHandler(console, fibApplication);
<a name="l00539"></a>00539 CleanupStack::PushL(fibKeyHandler);
<a name="l00540"></a>00540
<a name="l00541"></a>00541 <span class="comment">// issue initial request</span>
<a name="l00542"></a>00542 fibKeyHandler->RequestCharacter() ;
<a name="l00543"></a>00543
<a name="l00544"></a>00544 <span class="comment">// Main part of the program:</span>
<a name="l00545"></a>00545 <span class="comment">// wait loop that cycles until ActiveScheduler::Stop called</span>
<a name="l00546"></a>00546 CActiveScheduler::Start();
<a name="l00547"></a>00547
<a name="l00548"></a>00548 <span class="comment">// Remove items from the cleanup stack and destroy them</span>
<a name="l00549"></a>00549 CleanupStack::PopAndDestroy(4);
<a name="l00550"></a>00550 }
<a name="l00551"></a>00551
<a name="l00552"></a>00552
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