jade_events_dfd.tex

% Data flow diagram
% Template adapted from http://www.texample.net/tikz/examples/data-flow-diagram/ by David Fokkema
\documentclass{article}
\usepackage{tikz, tkz-euclide}
\usetikzlibrary{arrows,shapes}

% Custom, should be provided in the same directory.
\usepackage{datastore}

% Disable page number for better SVG.
\pagenumbering{gobble}

\begin{document}
\begin{tikzpicture}[
  font=\sffamily,
  every matrix/.style={ampersand replacement=\&,column sep=1cm,row sep=1cm},
  interface/.style={draw,thick,regular polygon,regular polygon sides=4,inner sep=0},
  process/.style={draw,thick,rounded corners,inner sep=.3 cm},
  datastore/.style={draw,thick,shape=datastore,inner sep=.3cm},
  to/.style={->,>=stealth',shorten >=1pt,semithick,font=\sffamily\footnotesize},
  bidi/.style={<->,>=stealth',shorten >=1pt,semithick,font=\sffamily\footnotesize},
  every node/.style={scale=0.9,align=center}]

  % Position the nodes using a matrix layout.
  \matrix{
        \& \node[interface] (consumer) {Consumer}; \\
        \& \node[process] (api) {Serve API}; \\
        \& \node[datastore] (raw) {Raw events \\ (stream)}; \\
    \node[process] (formatter) {Format \\ for logging};
        \& \node[process] (feed) {Format feed};
            \& \node[process] (dispatcher) {Perform actions}; \\
    \node[datastore] (log) {Raw event log \\ (PostgreSQL, private)};
        \& \node[interface] (subscriber) {Subscriber};
            \& \node[datastore] (db) {State database}; \\
    \node[process] (dumper) {Dumper}; \\
    \node[datastore] (modern-log) {Uniform log \\ (jsonlines, public)}; \\
  };

  \node [below=2cm, right=-2cm, align=flush center] at (modern-log)
  {\Large Judgment and Dialog Engine (JADE) events \\ \normalsize data flow diagram};

  % Draw and label arrows between nodes.
  \draw[bidi] (consumer) --
        node[midway, left] {requests}
        node[midway, right] {responses}
        (api);
  \draw[to] (api) -- node[midway, right] {event stream} (raw);
  \tkzMarkSegment[pos=.5,mark=||](api, raw)
  \draw[to] (raw) -- (feed);
  \tkzMarkSegment[pos=.5,mark=||](raw, feed)
  \draw[to] (feed) -- (subscriber);
  \draw[to] (raw) -- node[midway, right] {update judgments} (dispatcher);
  \tkzMarkSegment[pos=.5,mark=||](raw, dispatcher)
  \draw[to] (raw) -- (formatter);
  \tkzMarkSegment[pos=.5,mark=||](raw, formatter)
  \draw[to] (formatter) -- (log);
  \draw[to] (dispatcher) -- (db);
  \draw[to] (db) -- (dumper);
  \draw[to] (dumper) -- (modern-log);

\end{tikzpicture}
\end{document}