Architecture Diagram Description Language
Practice describing system architecture diagrams, narrating system design, and using spatial and relational vocabulary in English.
Frequently Asked Questions
What is a 'Node' in an ADL diagram and how does it relate to a component?
In Architecture Diagram Description Language, a Node represents a specific element within your system – this could be a server, database, or even a service. It's essentially the building block of your architecture; each node is associated with a defined Component which dictates its behavior and interactions.
How do I define 'Flow' between Nodes in ADL? Is it just labeled arrows?
Flow within an ADL diagram is represented by named connections between nodes. These flows are typed, specifying the communication protocol (e.g., HTTP, TCP) and data format used for interaction. The label on the arrow indicates the flow's purpose and any relevant metadata.
What's the difference between a 'Dependency' and a 'Flow' in ADL?
A Flow represents the active communication channel between two nodes, while a Dependency signifies a logical relationship – often an external reliance. A dependency doesn't necessarily imply data exchange; it simply indicates that one component needs another for operation or configuration.
Can ADL diagrams represent asynchronous communications? How is this handled?
Yes, ADL supports asynchronous communication via 'Event' nodes and associated flows. These flows are typed as 'Publish/Subscribe,' indicating that a node emits an event which other nodes can subscribe to without direct interaction at the time of publication.
What is a 'Transformation' defined in ADL, and when would I use it?
A Transformation node represents a data transformation step within your architecture. It's used to specify how data changes format or content during its flow through the system, typically triggered by specific flows or events.
How does ADL handle versioning and change tracking of diagrams?
ADL implementations often incorporate metadata for diagram versions and associated changes. This allows you to track modifications, revert to previous states, and understand the evolution of your architecture over time – usually managed through a revision number or timestamp.
What is a 'Property' associated with an ADL Node and what information can it hold?
A Property defines attributes specific to a node, such as its hostname, port number, or the type of database it connects to. These properties are crucial for configuration and dynamically adjusting the system based on defined characteristics.
How does ADL handle representing complex data structures in diagram flows?
ADL supports defining data structure schemas within flow specifications. This allows you to precisely describe the expected format of data exchanged between nodes, promoting interoperability and reducing potential errors during communication.
What's a 'Gateway' node in ADL, and what functionalities does it provide?
A Gateway node acts as a central point for controlling and routing flows within the architecture. It can implement policies like authentication, rate limiting, or request transformation before forwarding data to downstream nodes, providing advanced traffic management.
Can ADL diagrams represent physical infrastructure components (servers, networks) alongside software elements?
Yes, ADL allows you to integrate both logical and physical components. Nodes can be linked not just by flows but also with dependencies representing hardware connections or network links between servers, providing a holistic view of the system.