Mercurial > docs > DesignPatterns

annotate 03_observer.tex @ 36:f03413250b39 Ausarbeitung final

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author meillo@marmaro.de
date Sat, 11 Aug 2007 22:42:24 +0200
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1 % @file
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2 % @brief Referat DesignPatterns `Observer'
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3 % @author markus schnalke <meillo@marmaro.de>
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4 % @since 2007-05-30
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7 \documentclass{beamer}
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9 \usepackage[utf8]{inputenc}
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10 \usepackage{ngerman}
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11 \usepackage{graphicx}
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12 \usepackage[automark]{scrpage2}
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13 \input{Style01}
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15 \title{Observer-Pattern}
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16 \author{Markus Schnalke}
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17 \date{}
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19 \begin{document}
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22 \frame{
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23 \titlepage
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24 }
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27 \section[Outline]{}
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28 \frame{
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29 \tableofcontents
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30 }
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35 \section{Vorgehensweise}
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36 \frame{ \frametitle{Von der anderen Seite}
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38 \begin{block}{Gründe}
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39 Design Pattern sind ``Best Practices'' (= Erfolgsrezepte),
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40 meist \textbf{nach Vorbildern in der Realität}
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41 \end{block}
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42 \pause
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43 \begin{block}{Meine Vorgehensweise}
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44 Ich will nun anhand eines Beispiels aus dem täglichen Leben zeigen, dass
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45 das Design Pattern ``Observer'' ein absolut natürliches Vorgehen ist, das
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46 bei ähnlichen Situationen in Programmen deshalb ebenso verwendet werden
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47 sollte.
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48 \end{block}
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50 }
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53 \section{Erarbeitung des Patterns}
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54 \frame{ \frametitle{Ein Beispiel}
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56 \begin{block}{Die Situation}
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57 \begin{itemize}
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58 \item Personen die verkaufen möchten
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59 \item Personen die kaufen möchten
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60 \item Sie wollen/sollen sich nicht kennen
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61 \item Möglichst effektives Vorgehen
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62 \end{itemize}
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63 \end{block}
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64 \pause
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65 \begin{block}{Vorschläge?}
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66 \begin{itemize}
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67 \item
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68 \item
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69 \end{itemize}
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70 \end{block}
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72 }
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75 \subsection{Ansatz}
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76 \frame{ \frametitle{Ansatz}
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78 \begin{block}{Mögliche Vorgehen}
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79 \begin{itemize}
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80 \item Personen direkt ansprechen
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81 \item Laut in die Menge rufen
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82 \item Den Freunden erzählen, die es dann weitererzählen
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83 \end{itemize}
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84 \end{block}
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85
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86 \pause
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88 \begin{block}{Probleme}
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89 \begin{itemize}
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90 \item Man weiß nicht wer Interesse hat
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91 \item nicht mal wieviele
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92 \item Manche Interessenten sind vielleicht nur zu bestimmten Zeiten da
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93 \item (... oder sie sind taub)
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94 \end{itemize}
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95 \end{block}
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97 }
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101 \subsection{Erarbeitung einer Lösung}
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102
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103 \frame{ \frametitle{Eine (gute) Lösung: Pinnwand}
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104
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105 \begin{block}{Funktionsweise}
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106 \begin{itemize}
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107 \item Man kann Zettel anpinnen
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108 \item Hingehen und nach neuen Zetteln schauen
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109 \item Zettel lesen
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110 \item Zettel abnehmen
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111 \item Jeder der ein paar Fähigkeiten hat kann es
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112 \end{itemize}
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113 \end{block}
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114
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115 \pause
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116
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117 \begin{block}{Probleme}
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118 \begin{itemize}
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119 \item Man muss hingehen, nur um festzustellen, dass nichts Neues dabei ist
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120 \item Man kann wichtige Zettel verpassen
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121 \item Zettel sollten nicht weggenommen werden können
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122 \end{itemize}
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123 \end{block}
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125 }
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130 \frame{ \frametitle{Verbesserung: Pinnwand-Sekretärin}
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132 \begin{block}{Lösung}
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133 \begin{itemize}
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134 \item Durch Studiengebühren wird eine Sekretärin für die Pinnwand angestellt
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135 \item Pinnwand und Sekretärin sind fortan eine Einheit
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136 \item Man kann bei ihr einen Zettel in Auftrag geben (auch telefonisch)
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137 \item (Sie schreibt mit lesbarer Schrift)
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138 \item Sie verhindert, dass Zettel abgenommen werden
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139 \end{itemize}
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140 \end{block}
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141
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142 \pause
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143
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144 \begin{block}{Bestehendes Problem}
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145 \begin{itemize}
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146 \item Man läuft immer noch oft unnötig zur Pinnwand
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147 \end{itemize}
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148 \end{block}
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150 }
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153 \frame{ \frametitle{2. Verbesserung: Pinnwand-Sekretärin mit Benachrichtigung}
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154
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155 \begin{block}{Lösung}
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156 \begin{itemize}
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157 \item Durch Studiengebühren wird eine längere Arbeitszeit der Sekretärin finanziert
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158 \item Man kann sich bei der Sekretärin nun als ``Interessierter'' registrieren
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159 \item Die Sekretärin trägt die Telefonnummer in eine Liste ein
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160 \item Zukünftig ruft sie alle Personen der Liste an, wenn sie einen neuen Zettel anpinnt
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161 \end{itemize}
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162 \end{block}
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163
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164 }
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167 \subsection{Zusammenfassung}
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168
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169 \frame{ \frametitle{Zusammenfassung des Beispiels}
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170 \begin{block}{Pinnwand + Sekretärin + Benachrichtigung}
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171 \begin{itemize}
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172 \item Man kann neue Zettel anpinnen lassen
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173 \item Man kann sich als Interessierter anmelden (und auch abmelden)
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174 \item Interessierte werden bei Änderungen der Pinnwand benachrichtigt
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175 \item Sie können dann zur Pinnwand gehen und sie sich anschauen
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176 \end{itemize}
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177 \end{block}
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178
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179 \pause
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180
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181 \begin{block}{Eure Meinung?}
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182 \begin{itemize}
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183 \item Ist diese Struktur zufriedenstellend?
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184 \item Erfüllt sie alle Anforderungen?
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185 \item Was fehlt?
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186 \end{itemize}
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187 \end{block}
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188 }
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189
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190
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191
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192
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193
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194
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195 \section{Das Pattern}
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196
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197
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198 \frame{ \frametitle{Überleitung}
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199 \begin{block}{Neue Namen}
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200 \begin{itemize}
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201 \item Pinnwand-Sekretärin-Einheit $\rightarrow$ ``Subject''
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202 \item Die Zettel auf der Pinnwand $\rightarrow$ ``subjectState''
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203 \item Interessenten $\rightarrow$ ``Observers''
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204 \end{itemize}
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205 \end{block}
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206
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207 \pause
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208
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209 \begin{block}{Schnittstellen}
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210 Die Fähigkeiten der Pinnwand/Sekretärin und Interessenten sind ihre ``Interfaces''.
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211
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212 (vgl: taub, minimale Fähigkeiten, leserliche Schrift, ...)
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213 \end{block}
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214 }
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215
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216
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217 \subsection{UML-Diagramme}
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218 \frame { \frametitle{Struktur-Diagramm des Observers}
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219 \centerline{ \includegraphics[width=20em]{pics/observer_big.png} }
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220 }
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221
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222
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223 \frame { \frametitle{Interaktions-Diagramm des Observers}
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224 \centerline{ \includegraphics[width=26em]{pics/observer-interaction_big.png} }
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225 }
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226
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227
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228 % Daten aus der Beschreibung des Observers von GoF
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229 % in welche Gruppen wird er eingeordnet
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230 %\frame{ \frametitle{Beschreibung des Observers}
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231 %
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232 % \begin{block}{Klassifizierung}
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233 % Verhaltensmuster, objektbasierend
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234 % \end{block}
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235 %
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236 % \begin{block}{Auch bekannt als}
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237 % Publish-Subscribe, Dependents
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238 % \end{block}
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239 %
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240 % \begin{block}{Zweck}
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241 % Abhängigkeiten zwischen Objekten zu erstellen, sodass sich abhängige Objekte ändern, wenn sich das Objekt selbst ändert.
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242 % % todo: besser formulieren
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243 % \end{block}
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244 %
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245 % \begin{block}{Kurzbeschreibung}
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246 % Schnittstellen anlegen, um Abhängigkeiten zwischen Objekten registriert
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247 % werden können, und um die abhängigen Objekte über Zustandsänderungen zu
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248 % informieren.
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249 % % todo: Formulierung überdenken
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250 % \end{block}
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251 %
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252 %}
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253
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254
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255 \subsection{Beispiele}
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256 % Einsatzgebiete (MVC) und RL (Mailingslisten, Ebay-Suchabo)
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257 % nicht aber (Blog + RSS)
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258 \frame{ \frametitle{Der Observer in der Praxis}
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259 \begin{block}{Beispiele}
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260 \begin{itemize}
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261 \item Observer ist sehr verbreitet
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262 \item v.a. MVC (Model = Subject; View = Observer)
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263 \item Mailinglisten
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264 \item Ebay Such-Abo
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265 \end{itemize}
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266 \end{block}
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267
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268 \pause
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269
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270 \begin{block}{Aber}
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271 \begin{itemize}
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272 \item nicht Blog mit RSS-Feed!
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273 \end{itemize}
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274 \end{block}
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275 }
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276
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277
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278 %\subsection{Erweiterungen}
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279 %% Erweiterungen, verbleibende Probleme, Kompromisse beim Design
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280 %\frame{ \frametitle{Mögliche Erweiterungen}
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281 %
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282 % \begin{block}{Ein Observer und mehrere Subjects}
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283 % \begin{itemize}
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284 % \item Der Name des Subjects muss mitgesendet werden.
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285 % \end{itemize}
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286 % \end{block}
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287 %
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288 % \begin{block}{Nur für bestimmte Informationen anmelden}
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289 % \begin{itemize}
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290 % \item Oberservers melden sich nur für bestimmte Informationen an
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291 % \item Es werden weniger uninteressante Updates gesendet
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292 % \end{itemize}
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293 % \end{block}
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294 %
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295 % \begin{block}{UpdateManager}
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296 % \begin{itemize}
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297 % \item Bei komplexen Update-Zusammenhängen empfehlenswert
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298 % \item vermittelt zwischen Subject und Observer
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299 % \item (Mehr dazu in der Ausarbeitung)
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300 % \end{itemize}
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301 % \end{block}
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302 %
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303 %}
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304
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305
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306 %\frame{ \frametitle{Wer ruft notify() auf?}
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307 %
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308 % \begin{block}{Das Subject}
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309 % \begin{itemize}
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310 % \item[+] notify() wird sicher bei jedem setState() aufgerufen
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311 % \item[-] hohe Update-Kosten bei Änderungen en-block
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312 % \end{itemize}
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313 % \end{block}
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314 %
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315 % \begin{block}{Der Observer}
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316 % \begin{itemize}
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317 % \item[+] intelligenter Zeitpunkt des notify()-Aufrufs möglich
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318 % \item[-] der Client darf den notify()-Aufruf nicht vergessen
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319 % \end{itemize}
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320 % \end{block}
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321 %
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322 %}
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323
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324
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325
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326 \subsection{Code}
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327 \frame{ \frametitle{Code? --- Nein, kein Code!}
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328 \begin{block}{Denn}
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329 \begin{center}
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330 \textbf{ Implementierungen sind Schall und Rauch,\\
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331 Konzepte dagegen bleiben bestehen! }
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332 \end{center}
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333 \end{block}
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334
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335 \vspace{4ex}
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336 {\scriptsize
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337 \begin{block}{}
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338 \textit{ Beispiel-Implementierung in der Ausarbeitung. }
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339 \end{block}
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340 }
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341 }
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343
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344
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345 \section{Zusammenfassung}
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346 \frame{ %\frametitle{Zusammenfassend}
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347 \begin{block}{Zusammenfassung}
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348 \begin{itemize}
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349 \item Menschen denken basierend auf der Realität
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350 \item deshalb Design Patterns auf Realität zurückführen
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351 \item Patterns anwenden weil man es in der Realität auch so machen würde
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352 \end{itemize}
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353 \end{block}
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354
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355 }
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356
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357
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358 %\section{Fragen}
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359 %\frame{ \frametitle{Fragen?}
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360 % \vspace{5ex}
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361 % \centerline{\huge ?}
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362 %}
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363
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364
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365 % Erklaerung des Vorgehens
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366 % Frage: war es erfolgreich?
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367 %\frame{ \frametitle{}
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368 %
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369 % \begin{block}{}
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370 % \end{block}
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371 %
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372 %}
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373
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374
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375 %\frame{ \frametitle{Abschließend}
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376 % \begin{block}{Verwendete Software}
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377 % \begin{itemize}
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378 % \item Debian GNU/Linux
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379 % \item \LaTeX-Beamer und \texttt{pdflatex}
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380 % \item Vim
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381 % \item qiv und ImageMagick
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382 % \item Mercurial
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383 % \end{itemize}
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384 % \end{block}
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385 %
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386 % \begin{block}{}
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387 % \vspace{3ex}
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388 % \centerline{\textbf{Danke für eure Aufmerksamkeit}}
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389 % \end{block}
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390 %}
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391
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392
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393 % Code (Beispiel-Implementierung)
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394
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395
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396
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399
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400 %\input{main2.tex}
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402
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403 \end{document}
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409
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410 %\subsubsection{Fehlteilmanagement}
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411 %\frame{ \frametitle{Fehlteilmanagement}
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412 % %\includegraphics[width=10cm]{Pics/cc.png}
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413 %}
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414
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415 % \vspace{2ex}