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annotate 03_observer.tex @ 21:80c995d97cfa

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updated Observer
author meillo@marmaro.de
date Tue, 26 Jun 2007 14:36:01 +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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10 % \usepackage[T1]{fontenc}
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11 \usepackage[utf8]{inputenc}
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12 \usepackage{ngerman}
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13 \usepackage{graphicx}
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14 \usepackage[automark]{scrpage2}
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15 \input{Style01}
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19 \begin{document}
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22 \title{Observer-Pattern}
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23 \author{Markus Schnalke}
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24 \date{}
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26 %\titlegraphic{\includegraphics[width=3cm]{Pics/Maka-Logo.png}}
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27
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28 \frame{
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29 \titlepage
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30 }
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36 \section[Outline]{}
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37 \frame{
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38 \tableofcontents
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39 }
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44 \section{Vorgehensweise}
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45
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46 \frame{ \frametitle{Von der anderen Seite}
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47
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48 \begin{block}{Gründe}
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49 Design Pattern sind so etwas wie ``Best Practices'' (also bewährte
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50 Vorgehensweisen), meist \textbf{nach Vorbildern in der Wirklichkeit}
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51 \end{block}
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52 \pause
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53 \begin{block}{Meine Vorgehensweise}
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54 Ich will nun anhand eines Beispiels aus dem täglichen Leben zeigen, dass
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55 das Design Pattern ``Observer'' ein absolut natürliches Vorgehen ist, das
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56 bei ähnlichen Situationen in Programmen deshalb ebenso verwendet werden
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57 sollte.
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58 \end{block}
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60 }
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63 \section{Erarbeitung des Patterns}
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64
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65 \frame{ \frametitle{Ein Beispiel}
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66
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67 \begin{block}{Die Situation}
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68 \begin{itemize}
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69 \item Personen die verkaufen möchten
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70 \item Personen die kaufen möchten
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71 \item Sie wollen/sollen sich nicht kennen
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72 \item Möglichst effektives Vorgehen
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73 \end{itemize}
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74 \end{block}
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75 \pause
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76 \begin{block}{Vorschläge?}
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77 \begin{itemize}
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78 \item
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79 \item
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80 \end{itemize}
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81 \end{block}
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83 }
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86 \subsection{Ansatz}
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87 \frame{ \frametitle{Ansatz}
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89 \begin{block}{Mögliche Vorgehen}
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90 \begin{itemize}
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91 \item Personen direkt ansprechen
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92 \item Laut in die Menge rufen
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93 \item Den Freunden erzählen, die es dann weitererzählen
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94 \end{itemize}
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95 \end{block}
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96
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97 \pause
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98
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99 \begin{block}{Probleme}
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100 \begin{itemize}
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101 \item Man weiß nicht wer Interesse hat
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102 \item nicht mal wieviele
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103 \item Manche Interessenten sind vielleicht nur zu bestimmten Zeiten da
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104 \item ... oder sie sind taub
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105 \end{itemize}
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106 \end{block}
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107
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108 }
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111
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112 \subsection{Erarbeitung einer Lösung}
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113
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114 \frame{ \frametitle{Eine (gute) Lösung: Pinnwand}
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115
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116 \begin{block}{Funktionsweise}
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117 \begin{itemize}
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118 \item Man kann Zettel anpinnen
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119 \item Hingehen und nach neuen Zetteln schauen
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120 \item Zettel lesen
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121 \item Zettel abnehmen
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122 \item Jeder der ein paar Fähigkeiten hat kann es
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123 \end{itemize}
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124 \end{block}
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125
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126 \pause
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127
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128 \begin{block}{Probleme}
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129 \begin{itemize}
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130 \item Man muss hingehen, nur um festzustellen, dass nichts Neues dabei ist
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131 \item Man kann wichtige Zettel verpassen
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132 \item Zettel sollten nicht weggenommen werden können
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133 \end{itemize}
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134 \end{block}
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136 }
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141 \frame{ \frametitle{Verbesserung: Pinnwand-Sekretärin}
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142
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143 \begin{block}{Lösung}
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144 \begin{itemize}
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145 \item Durch Studiengebühren wird eine Sekretärin für die Pinnwand angestellt
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146 \item Pinnwand und Sekretärin sind fortan eine Einheit
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147 \item Man kann bei ihr einen Zettel in Auftrag geben (auch telefonisch)
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148 \item (Sie schreibt mit lesbarer Schrift)
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149 \item Sie verhindert, dass Zettel abgenommen werden
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150 \end{itemize}
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151 \end{block}
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152
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153 \pause
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154
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155 \begin{block}{Bestehendes Problem}
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156 \begin{itemize}
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157 \item Man läuft immer noch oft unnötig zur Pinnwand
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158 \end{itemize}
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159 \end{block}
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160
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161 }
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164 \frame{ \frametitle{2. Verbesserung: Pinnwand-Sekretärin mit Benachrichtigung}
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165
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166 \begin{block}{Lösung}
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167 \begin{itemize}
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168 \item Durch Studiengebühren wird eine längere Arbeitszeit der Sekretärin finanziert
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169 \item Man kann sich bei der Sekretärin nun als ``Interessierter'' registrieren
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170 \item Die Sekretärin trägt die Telefonnummer in eine Liste ein
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171 \item Zukünftig ruft sie alle Personen der Liste an, wenn sie einen neuen Zettel anpinnt
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172 \end{itemize}
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173 \end{block}
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175 }
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178 \subsection{Zusammenfassung}
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179
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180 % Zusammenfassung des Beispiels: Was haben wir, ist alles abgedeckt
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181 % Frage: Sind die Zuhörer zufrieden? Ist die Lösung gut?
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182 \frame{ \frametitle{Zusammenfassung des Beispiels}
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183
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184 \begin{block}{Pinnwand + Sekretärin + Benachrichtigung}
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185 \begin{itemize}
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186 \item Man kann neue Zettel anpinnen lassen
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187 \item Man kann sich als Interessierter anmelden (und auch abmelden)
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188 \item Interessierte werden bei Änderungen der Pinnwand benachrichtigt
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189 \item Sie können dann zur Pinnwand gehen und sie sich anschauen
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190 \end{itemize}
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191 \end{block}
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192
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193 \pause
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194
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195 \begin{block}{Eure Meinung?}
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196 \begin{itemize}
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197 \item Ist diese Struktur zufriedenstellend?
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198 \item Erfüllt sie alle Anforderungen?
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199 \item Was fehlt?
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200 \end{itemize}
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201 \end{block}
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202
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203 }
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204
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205
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207
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208
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209
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210 \section{Das Pattern}
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211
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212
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213 \frame{ \frametitle{Überleitung}
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214
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215 \begin{block}{Neue Namen}
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216 \begin{itemize}
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217 \item Pinnwand-Sekretärin-Einheit $\rightarrow$ ``Subject''
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218 \item Die Zettel auf der Pinnwand $\rightarrow$ ``subjectState''
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219 \item Interessenten $\rightarrow$ ``Observers''
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220 \end{itemize}
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221 \end{block}
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222
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223 \pause
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224
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225 \begin{block}{Schnittstellen}
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226 Die Fähigkeiten der Pinnwand/Sekretärin und Interessenten sind ihre ``Interfaces''.
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227
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228 (rem: taub, minimale Fähigkeiten, leserliche Schrift, ...)
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229 \end{block}
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230
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231 }
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232
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233
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234 \frame { \frametitle{Struktur-Diagramm des Observers}
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235 \centerline{ \includegraphics[width=20em]{pics/observer_big.png} }
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236 }
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237
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238
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239 \frame { \frametitle{Interaktions-Diagramm des Observers}
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240 \centerline{ \includegraphics[width=26em]{pics/observer-interaction_big.png} }
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241 }
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242
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243
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244 % Daten aus der Beschreibung des Observers von GoF
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245 % in welche Gruppen wird er eingeordnet
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246 %\frame{ \frametitle{Beschreibung des Observers}
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247 %
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248 % \begin{block}{Klassifizierung}
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249 % Verhaltensmuster, objektbasierend
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250 % \end{block}
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251 %
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252 % \begin{block}{Auch bekannt als}
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253 % Publish-Subscribe, Dependents
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254 % \end{block}
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255 %
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256 % \begin{block}{Zweck}
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257 % Abhängigkeiten zwischen Objekten zu erstellen, sodass sich abhängige Objekte ändern, wenn sich das Objekt selbst ändert.
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258 % % todo: besser formulieren
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259 % \end{block}
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260 %
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261 % \begin{block}{Kurzbeschreibung}
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262 % Schnittstellen anlegen, um Abhängigkeiten zwischen Objekten registriert
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263 % werden können, und um die abhängigen Objekte über Zustandsänderungen zu
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264 % informieren.
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265 % % todo: Formulierung überdenken
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266 % \end{block}
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267 %
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268 %}
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269
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270
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271 \subsection{Beispiele}
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272 % Einsatzgebiete (MVC) und RL (Mailingslisten, Ebay-Suchabo)
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273 % nicht aber (Blog + RSS)
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274 \frame{ \frametitle{Der Observer in der Praxis}
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275
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276 \begin{block}{Beispiele}
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277 \begin{itemize}
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278 \item Observer ist sehr verbreitet
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279 \item v.a. MVC (Model = Subject; View = Observer)
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280 \item Mailinglisten
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281 \item Ebay Such-Abo
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282 \end{itemize}
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283 \end{block}
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284
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285 \pause
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286
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287 \begin{block}{Aber}
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288 \begin{itemize}
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289 \item nicht Blog mit RSS-Feed!
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290 \end{itemize}
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291 \end{block}
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292
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293 }
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294
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295
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296 \subsection{Erweiterungen}
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297 % Erweiterungen, verbleibende Probleme, Kompromisse beim Design
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298 \frame{ \frametitle{Mögliche Erweiterungen}
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299
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300 \begin{block}{Ein Observer und mehrere Subjects}
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301 \begin{itemize}
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302 \item Der Name des Subjects muss mitgesendet werden.
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303 \end{itemize}
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304 \end{block}
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305
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306 \begin{block}{Nur für bestimmte Informationen anmelden}
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307 \begin{itemize}
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308 \item Oberservers melden sich nur für bestimmte Informationen an
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309 \item Es werden weniger uninteressante Updates gesendet
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310 \end{itemize}
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311 \end{block}
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312
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313 \begin{block}{UpdateManager}
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314 \begin{itemize}
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315 \item Bei komplexen Update-Zusammenhängen empfehlenswert
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316 \item vermittelt zwischen Subject und Observer
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317 \item (Mehr dazu in der Ausarbeitung)
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318 \end{itemize}
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319 \end{block}
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320
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321 }
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322
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323
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324 %\frame{ \frametitle{Wer ruft notify() auf?}
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325 %
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326 % \begin{block}{Das Subject}
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327 % \begin{itemize}
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328 % \item[+] notify() wird sicher bei jedem setState() aufgerufen
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329 % \item[-] hohe Update-Kosten bei Änderungen en-block
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330 % \end{itemize}
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331 % \end{block}
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332 %
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333 % \begin{block}{Der Observer}
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334 % \begin{itemize}
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335 % \item[+] intelligenter Zeitpunkt des notify()-Aufrufs möglich
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336 % \item[-] der Client darf den notify()-Aufruf nicht vergessen
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337 % \end{itemize}
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338 % \end{block}
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339 %
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340 %}
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341
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342
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343
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344 \subsection{Code}
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345 % Kein Code!
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346 \frame{ \frametitle{Code? --- Nein, kein Code!}
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347
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348 \begin{block}{Denn}
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349 \begin{center}
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350 \textbf{ Implementierungen sind Schall und Rauch,\\
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351 Konzepte dagegen bleiben bestehen! }
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352 \end{center}
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353 \end{block}
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354
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355 \vspace{4ex}
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356 {\scriptsize
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357 \begin{block}{}
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358 \textit{ Beispiel-Implementierung in der Ausarbeitung. }
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359 \end{block}
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360 }
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361
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362 }
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363
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364
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365
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366 \section{Zusammenfassung}
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367 \frame{ %\frametitle{Zusammenfassend}
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368 \begin{block}{Zusammenfassung}
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369 \begin{itemize}
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370 \item Menschen denken basierend auf der Realität
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371 \item deshalb Design Patterns auf Realität zurückführen
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372 \item Patterns anwenden weil man es in der Realität auch so machen würde
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373 \end{itemize}
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374 \end{block}
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375
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376 }
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377
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378
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379 %\section{Fragen}
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380 %\frame{ \frametitle{Fragen?}
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381 % \vspace{5ex}
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382 % \centerline{\huge ?}
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383 %}
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384
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385
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386 % Erklaerung des Vorgehens
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387 % Frage: war es erfolgreich?
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388 %\frame{ \frametitle{}
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389 %
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390 % \begin{block}{}
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391 % \end{block}
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392 %
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393 %}
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394
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395
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396 %\frame{ \frametitle{Abschließend}
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397 % \begin{block}{Verwendete Software}
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398 % \begin{itemize}
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399 % \item Debian GNU/Linux
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400 % \item \LaTeX-Beamer und \texttt{pdflatex}
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401 % \item Vim
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402 % \item qiv und ImageMagick
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403 % \item Mercurial
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404 % \end{itemize}
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405 % \end{block}
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406 %
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407 % \begin{block}{}
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408 % \vspace{3ex}
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409 % \centerline{\textbf{Danke für eure Aufmerksamkeit}}
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410 % \end{block}
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411 %}
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412
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413
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414 % Code (Beispiel-Implementierung)
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415
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416
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417
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418
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419
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420
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421 %\input{main2.tex}
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422
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423
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424 \end{document}
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425
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426
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427
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428
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429
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430
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431 %\subsubsection{Fehlteilmanagement}
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432 %\frame{ \frametitle{Fehlteilmanagement}
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433 % %\includegraphics[width=10cm]{Pics/cc.png}
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434 %}
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435
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436 % \vspace{2ex}