Description
The code defines a sequence diagram using the tikz-uml package in LaTeX. The diagram includes three objects/classes B, C, and D. The fill object and fill call styles are set to white and gray, respectively. The diagram depicts a loop where B sends a message to C, and based on a condition, C may either send a message to D or assess the update and send a message back to B. The condition is depicted with an alt fragment. If C sends the message to D, D will execute the run operation before returning a message to C, which will then continue the loop. The diagram also includes three timeline markers for B, C, and D that indicate the duration between messages.
Keywords
latex, tikz-uml, umlobject, umlseqdiag, umlfragment, umlcallself, umlcall, umlfpart, umlsdnode
Source Code
\documentclass[border=3mm]{standalone}
\usepackage[english]{babel}
\usepackage{tikz-uml}
\begin{document}
\begin{tikzpicture}
\tikzumlset{fill object = white, fill call = gray!20}
\begin{umlseqdiag}
\umlobject[class=B]{b}
\umlobject[class=C]{c}
\umlobject[class=D]{d}
\begin{umlfragment}[type=loop]
\begin{umlcallself}[op=run]{b}
\begin{umlcall}[op=send, type=asynchron]{b}{c}
\begin{umlfragment}[type=alt, label=condition, inner xsep=8]
\begin{umlcall}[op=send, type=synchron, return=send update]{c}{d}
\begin{umlcallself}[padding=1.5, op=run]{d}
\end{umlcallself}
\end{umlcall}
\begin{umlcallself}[op=assess update]{c}
\begin{umlcall}[op=send update, type=synchron, return=acknowledge]{c}{b}
\end{umlcall}
\begin{umlcall}[op=allow continue, padding=-2.5, type=asynchron]{c}{b}
\end{umlcall}
\end{umlcallself}
\umlfpart[default]
\begin{umlcall}[op=allow continue, type=asynchron]{c}{b}
\end{umlcall}
\end{umlfragment}
\end{umlcall}
\end{umlcallself}
\end{umlfragment}
\umlsdnode[dt=1.5]{b}
\umlsdnode[dt=5]{c}
\umlsdnode[dt=32]{d}
\end{umlseqdiag}
\end{tikzpicture}
\end{document}