Draw a diagram showing your systemĪs a box in the centre, surrounded by its users and the other systems that it interacts with.ĭetail isn't important here as this is your zoomed out view showing a big picture of the system landscape.
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In the C4 model, components are not separately deployable units.Ī System Context diagram is a good starting point for diagramming and documenting a software system,Īllowing you to step back and see the big picture. one component vs many components per JAR file, DLL, shared library, etc) is a separate and orthogonal concern.Īn important point to note here is that all components inside a container typically execute in the same process space. Aspects such as how those components are packaged (e.g. If you're using a language like Java or C#, the simplest way to think of a component is that it's a collection of implementation classes behind an interface. The word "component" is a hugely overloaded term in the software development industry, but in this context a component is a grouping of related functionality encapsulated behind a well-defined interface.
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Mobile app: An Apple iOS app, an Android app, a Microsoft Windows Phone app, etc.Client-side desktop application: A Windows desktop application written using WPF, an OS X desktop application written using Objective-C, a cross-platform desktop application written using JavaFX, etc.Client-side web application: A JavaScript application running in a web browser using Angular, Backbone.JS, jQuery, etc.Server-side web application: A Java EE web application running on Apache Tomcat, an ASP.NET MVC application running on Microsoft IIS, a Ruby on Rails application running on WEBrick, a Node.js application, etc.In real terms, a container is something like:
A container is something that needs toīe running in order for the overall software system to work. Not Docker! In the C4 model, a container represents an application or a data store. In many cases, a software system is "owned by" a single software development team. This includes the software system you are modelling, and the other software systems upon which your software system depends (or vice versa).
actors, roles, personas, etc).Ī software system is the highest level of abstraction and describes something that delivers value to its users, whether they are human or not. Which in turn are implemented by one or more code elements (classes, interfaces, objects, functions, etc).Īnd people may use the software systems that we build.Ī person represents one of the human users of your software system (e.g. In order to create these maps of your code, we first need a common set of abstractions to create a ubiquitous language that we can use to describe the static structure of a software system.Ī software system is made up of one or more containers (applications and data stores),Įach of which contains one or more components,
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