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%!TEX root = Programmierparadigmen.tex
\chapter{Java}
\index{Java|(}
Im Folgenden wird in aller Kürze erklärt, wie man in Java Programme schreibt,
die auf mehreren Prozessoren laufen.
\section{Thread, ThreadPool und Runnable}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\texttt{Interface Runnable}\\
\-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.lang.Thread}\xindex{Runnable}%
\begin{itemize}
\item Methods:
\begin{itemize}
\item \texttt{void run()}: When an object implementing interface
Runnable is used to create a thread, starting the thread causes the
object's run method to be called in that separately executing thread.
\end{itemize}
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\texttt{Class Thread}\\
\-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.lang.Thread}\xindex{Thread}%
\begin{itemize}
\item implements Runnable
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\texttt{Class ThreadPoolExecutor}\xindex{ThreadPoolExecutor}\\
\-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent.ThreadPoolExecutor}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\texttt{Interface Callable<V>}\xindex{Callable}\\
\-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent}
\begin{itemize}
\item Parameter: \texttt{V} - the result type of method call
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Futures}\xindex{Future}\index{Promise|see{Future}}
\enquote{Ein Future (engl. \enquote{Zukunft}) oder ein Promise (engl. \enquote{Versprechen}) bezeichnet in der Programmierung einen Platzhalter (Proxy) für ein Ergebnis, das noch nicht bekannt ist, meist weil seine Berechnung noch nicht abgeschlossen ist.}
\texttt{Interface Future<V>}\xindex{Future}\\
\-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent}
\textbf{Parameter}:
\begin{itemize}
\item \texttt{V}: The result type returned by this Future's get method
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\textbf{Beispiel}:
% Zu lang, geht das kürzer?
%\inputminted[numbersep=5pt, tabsize=4]{java}{scripts/java/matrix-multiplication.java}
\begin{beispiel}[Runnable, ExecutorService, ThreadPool\footnotemark]
\inputminted[numbersep=5pt, tabsize=4]{java}{scripts/java/vorlesung-futures-basics.java}
\end{beispiel}
\footnotetext{WS 2013/2014, Kapitel 41, Folie 26}
\section{Literatur}
\begin{itemize}
\item \href{http://openbook.galileocomputing.de/javainsel9/javainsel_14_004.htm}{Java ist auch eine Insel}: Kapitel 14 -
Threads und nebenläufige Programmierung
\item \href{http://www.vogella.com/tutorials/JavaConcurrency/article.html}{vogella.com}: Java concurrency (multi-threading) - Tutorial
\item Links zur offiziellen Java 8 Dokumentation:
\begin{itemize}
\item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html}{ThreadPoolExecutor}
\item \href{http://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html}{Runnable}
\item \href{http://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html}{Thread}
\item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Callable.html}{Callable}
\item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html}{Future}
\end{itemize}
\end{itemize}
\index{Java|)}