Architectural Patterns

Designing software doesn’t start with a blank page, but with a bricolage of different model elements.

Architectural patterns model pre-defined components, connectors, responsibilities, and requirements or goals that the model elements satisfy.

Editing Architectural Patterns

Architectural Patterns table
  • Select the Requirements / Architectural Patterns table to view the table of Architectural Patterns. The table provides a summary of the Damage-Effort Ratios for Interfaces, Channels, and Untrusted Surfaces. These metrics are explained in more details here.
  • To create a new Architectural Pattern in CAIRIS, click on the Add button to open the Architectural Pattern form.
Architectural Pattern form
  • Enter the name for the architectural pattern and provided a synopsis for the pattern.
  • Select the Components folder, and click on the Add button to open the Component form.
Component form
  • Enter a name for component.
  • Select the Interfaces folder, and click on the Add button to add a new interface.
Component interface dialog
  • Enter the name of the interface, and select whether the interface is provided or required, the interface access right, and privilege. Click on Add to add the interface to the component.
  • Select the Structure folder, and click on the Add button to add a new template asset association to the component.
Component structure dialog
  • For both the head and tail end of the template asset association, select the template asset, navigability indicator (0 or 1), adornment (inheritance, association, aggregation, composition, or dependency), cardinality nry (1, , or 1..), and an optional role. Click on Add to add the association to the component template asset structure.
  • If there are template requirements associated with the component, click on the Requirements folder and click on the Add button to select a requirement, and click on the Add button to add the template requirement to the component.
Template goal dialog
  • If there are template goals associated with the component, click on the Goals folder and click on the Add button to select a goal, and click on the Add button to add the template goal to the component.
  • To add relationships between template goals associated with the component, click on the Goal Associations folder and click on the Add button to add a new Goal Association.
add template goal association
  • Select the template goal and sub-goals, the form of refinement (and / or), and enter some rationale for this relationship. Click on the Add button to add this goal association to the component.
  • Click on the Update button to add the component to the architectural pattern.
  • Select the Connectors folder, and click on the Add button to open the Connector form.
  • Enter a name for the connector.
  • Select the From folder to enter details of the from end of the connector. Enter the role name, and select the component and component interface.
  • Select the To folder to enter details of the to end of the connector. Enter the role name, and select the component and component interface.
  • Select the Details folder to enter information about the connector itself. Select the asset being carried by the connector, the connector protocol, and the access right needed to interact with the connector. Available assets are drawn from the asset structure of both components.
  • Click on the Update button to add the connector to the architectural pattern.
  • Click on the Create button to add the architectural pattern.

Viewing Architectural Patterns

Architectural patterns can be viewed by clicking on the Models/Architectural Patterns menu option, and selecting the architectural pattern to display

Architectural Pattern Model

Components in this model are shaded red based on the component attack surface, This value is based on the DERi metric.

Component Asset Model

It is also possible to view asset and goal models associated with a component in an architectural pattern by right clicking on the component in the architectural patterns component table, and select the View Assets or View Goals respectively.

Situating a pattern

weakness analysis
  • To introduce an architectural pattern into the working project, Right click on the architectural pattern in the architectural patterns table, select Weakness Analysis, followed by the environment to situate the pattern in. A weakness analysis dialog is displayed, which summarises the threats and vulnerabilities that will become associated with the pattern, the impact to persona task scores, and obstacles mitigated by goals introduced by the pattern. Clicking on the Situate button introduces the patterns template goals, requirements, and assets as standard goals, requirements, and assets respectively.