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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 id="__docusaurus" class="postHeaderTitle">C4</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="c4-diagrams"></a><a href="#c4-diagrams" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>C4 Diagrams</h2>
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<p><a href="https://c4model.com/">C4</a> is a standardized model to visualize software architecture.
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You can generate C4 diagrams by using the node and edge classes from the <code>diagrams.c4</code> package:</p>
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<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Diagram
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<span class="hljs-keyword">from</span> diagrams.c4 <span class="hljs-keyword">import</span> Person, Container, Database, System, SystemBoundary, Relationship
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graph_attr = {
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<span class="hljs-string">"splines"</span>: <span class="hljs-string">"spline"</span>,
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}
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Container diagram for Internet Banking System"</span>, direction=<span class="hljs-string">"TB"</span>, graph_attr=graph_attr):
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customer = Person(
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name=<span class="hljs-string">"Personal Banking Customer"</span>, description=<span class="hljs-string">"A customer of the bank, with personal bank accounts."</span>
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)
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<span class="hljs-keyword">with</span> SystemBoundary(<span class="hljs-string">"Internet Banking System"</span>):
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webapp = Container(
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name=<span class="hljs-string">"Web Application"</span>,
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technology=<span class="hljs-string">"Java and Spring MVC"</span>,
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description=<span class="hljs-string">"Delivers the static content and the Internet banking single page application."</span>,
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)
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spa = Container(
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name=<span class="hljs-string">"Single-Page Application"</span>,
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technology=<span class="hljs-string">"Javascript and Angular"</span>,
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description=<span class="hljs-string">"Provides all of the Internet banking functionality to customers via their web browser."</span>,
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)
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mobileapp = Container(
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name=<span class="hljs-string">"Mobile App"</span>,
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technology=<span class="hljs-string">"Xamarin"</span>,
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description=<span class="hljs-string">"Provides a limited subset of the Internet banking functionality to customers via their mobile device."</span>,
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)
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api = Container(
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name=<span class="hljs-string">"API Application"</span>,
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technology=<span class="hljs-string">"Java and Spring MVC"</span>,
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description=<span class="hljs-string">"Provides Internet banking functionality via a JSON/HTTPS API."</span>,
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)
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database = Database(
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name=<span class="hljs-string">"Database"</span>,
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technology=<span class="hljs-string">"Oracle Database Schema"</span>,
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description=<span class="hljs-string">"Stores user registration information, hashed authentication credentials, access logs, etc."</span>,
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)
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email = System(name=<span class="hljs-string">"E-mail System"</span>, description=<span class="hljs-string">"The internal Microsoft Exchange e-mail system."</span>, external=<span class="hljs-literal">True</span>)
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mainframe = System(
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name=<span class="hljs-string">"Mainframe Banking System"</span>,
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description=<span class="hljs-string">"Stores all of the core banking information about customers, accounts, transactions, etc."</span>,
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external=<span class="hljs-literal">True</span>,
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)
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customer >> Relationship(<span class="hljs-string">"Visits bigbank.com/ib using [HTTPS]"</span>) >> webapp
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customer >> Relationship(<span class="hljs-string">"Views account balances, and makes payments using"</span>) >> [spa, mobileapp]
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webapp >> Relationship(<span class="hljs-string">"Delivers to the customer's web browser"</span>) >> spa
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spa >> Relationship(<span class="hljs-string">"Make API calls to [JSON/HTTPS]"</span>) >> api
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mobileapp >> Relationship(<span class="hljs-string">"Make API calls to [JSON/HTTPS]"</span>) >> api
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api >> Relationship(<span class="hljs-string">"reads from and writes to"</span>) >> database
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api >> Relationship(<span class="hljs-string">"Sends email using [SMTP]"</span>) >> email
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api >> Relationship(<span class="hljs-string">"Makes API calls to [XML/HTTPS]"</span>) >> mainframe
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customer << Relationship(<span class="hljs-string">"Sends e-mails to"</span>) << email
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</code></pre>
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<p>It will produce the following diagram:</p>
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<p><img src="/img/c4.png" alt="c4"></p>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 9/5/2022</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/nodes/saas"><span class="arrow-prev">← </span><span>Saas</span></a><a class="docs-next button" href="/docs/nodes/custom"><span>Custom</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#c4-diagrams">C4 Diagrams</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/getting-started/installation">Getting Started</a><a href="/docs/guides/diagram">Guides</a><a href="/docs/nodes/aws">Nodes</a></div><div><h5>More</h5><iframe src="https://ghbtns.com/github-btn.html?user=mingrammer&repo=diagrams&type=star&count=true&size=large" frameBorder="0" scrolling="0" width="170" height="30" title="Star mingrammer/diagrams on GitHub"></iframe></div></section><section class="copyright">Copyright © 2025 mingrammer</section></footer></div></body></html> |
