![]() ![]() Sequence Diagrams are part of a subset of behavior diagrams known as interaction diagrams, which emphasis control and data flow. High-level architecture diagram Sequence Diagrams It also demonstrates behavioral aspects from a Communication Diagram, which uses messages represented by arrows labeled with chronological numbers.įigure 1. It includes structural aspects from a high-level Deployment Diagram, which depicts network connections between AWS services. CloudFront routes the HTTP request to the matching API Gateway.įigure 1 architecture diagram is a free-form mixture between a structure diagram and a behavior diagram.The function matches the header value to data fetched from an Amazon DynamoDB table, then modifies the Host header and path of the request and returns it to CloudFront.CloudFront invokes the function for the Origin Request event.User sends an HTTP request to CloudFront, including a version header.The numbered labels in Figure 1 correspond to the following text descriptions: Amazon CloudFront is a global content delivery network (CDN) service built for high-speed, low-latency performance, security, and developer you run functions that customize the content that CloudFront delivers. The architecture is based on Implementing header-based API Gateway versioning with Amazon CloudFront from the AWS Compute Blog, which uses the AWS to dynamically route the request to the targeted API version.Īmazon API Gateway is a fully managed service that makes it easier for developers to create, publish, maintain, monitor, and secure APIs at any scale. All diagrams in this post were rendered from a text-based domain specific language using a diagrams-as-code tool instead of being drawn with graphical diagramming software. Each diagram adds to the vocabulary and graphical notation of Sequence Diagrams, then shows how the diagram deepened understanding of the architecture. This post takes a sample architecture and iteratively builds out a set of Sequence Diagrams. Using Sequence Diagrams, you can explore additional usage scenarios and enrich your understanding of the distributed architecture while continuing to communicate visually. As the level of detail increases, so does the diagram’s size, density, and layout complexity. There’s nothing to install on your computer (if you don’t want to) and it’s very easy to get started.Architecture diagrams visually communicate and document the high-level design of a solution. This might sound intimidating, and I thought so too at first, but it’s relatively simple. Along with DOT, I use Graphviz, which is a library of programs for converting the DOT code into the visual graph. My personal favorite is called DOT, which is a graph description language. ![]() I tried googling around, but it was hard to tell if “DOT” the language was different from “dot” the rendering layout engine (similar to neato, fdp, twopi). Warning: For any graphviz experts reading, I might get some terminology wrong here. There’s also tons of websites that offer tools for this. There’s tons of ways to do this…pen and paper, notepad, flowchart/diagramming software including both paid and free ones. This is something I do a lot when I’m tracing through code, or if I’m trying to work out a very basic structure of how something should work. To get a better idea of what I was looking at I decided to throw together a quick visual diagram. It spanned multiple databases on multiple servers. I was beginning to forget which things were calling other things. Today I was tracing through a chain of SQL stored procedures, tables, views, jobs, windows services, etc.
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