broker_activiy.tex

\begin{tikzpicture}[node distance=1cm, font=\small\sffamily]
%------------------------------------------------------
%Draw elements
%------------------------------------------------------
\node (connect) [block] {connect};
\node (write) [block, below of=connect] {write};
\node (read) [block, below of=write, yshift=-8cm] {read};
\node (accept) [block, right of=connect, xshift=6cm] {accept};
\node (read1) [block, below of=accept] {read};
\node (preq) [block, below of=read1, yshift=-1cm] {Parse Request};
\node (hreq) [block, below of=preq, yshift=-2cm, minimum height = 4cm] {Request Handler};
\node (errh) [block, left of=hreq, xshift=-2cm, minimum height = 4cm, text width=1.5cm] {Request Error Handler};
\node (write1) [block, below of=hreq, yshift=-3cm] {write};
\node (close) [block, below of=write1, yshift=-.5cm] {close};
\node (serrh) [block, right of=hreq, xshift=2.5cm, minimum height = 9cm, text width=2cm] {Socket Error Handler};
%------------------------------------------------------

%------------------------------------------------------
%Draw rectangles and text
%------------------------------------------------------
%\node (a) [draw,fit={($(preq.north east)+(.5,.7)$) ($(errh.south west)+(2.4,-.2)$)}] {};
%\node [anchor=north west,inner sep=1pt] at (a.north west) {handle request};
\node (b1) [blank, above of=connect, xshift=-.8cm] {\bfseries{Client\\ (Producer/Consumer)}};
\node (b2) [blank, right of=b1, anchor=south, xshift=7cm] {\bfseries{Broker}};
%\node (b) [draw, fit={($(b1.north west)+(-1,1)$) ($(serrh.south east)+(1,-1.5)$)}] {};
%\node (c) [xshift=-3cm, inner sep=2pt] at (b.south) {}; 
%\node (d) [xshift=-3cm, inner sep=2pt] at (b.north) {};
%\draw [dashed] (c) -- (d);
\node (phantom) [right of=write1, xshift=1.5cm] {};
%------------------------------------------------------

%------------------------------------------------------
%Draw lines between elements
%------------------------------------------------------
\begin{scope}
%Straight lines
\path [line] (connect) -- node[anchor=south]{Handshake} (accept);
\path [line] (write) -- node[anchor=east]{wait} (read);
\path [line] (write) -- node[anchor=south]{Request} (read1);
\path [line] (accept) -- node[anchor=west] {fork} (read1);
\path [line] (read1) -- (preq);
\path [line] (preq) -- (hreq);
\path [line] (hreq) -- (errh);
\path [line] (hreq) -- node [anchor=west, yshift=.3cm] (mid) {} (write1);
\path [line] (write1.east) -- (phantom);
\path [line] (write1) -- node[anchor=south]{Response} (read);
\path [line] (write1) -- (close);
%Angled lines
\path [line] (read1) -| (serrh);
\path [line] (serrh) |- (close);
\path [line] (read) -- + (-2,0) |- (write);
\path [draw] (errh.south) |- (mid);
\end{scope}
%------------------------------------------------------
\end{tikzpicture}