Software Architecture in Golang: Quality Attributes, Non-Functional Requirements and ilities
In Software Architecture, regarding Requirements, there are two types: "Functional Requirements" and "Non-Functional Requirements"
"Functional Requirements" indicate how a system should function, for example:
"System must do XYZ"
"System should encode images in different sizes"
"Non-Functional Requirements" indicate how a system should be, for example:
"System must be ABC"
"System should be able to respond to spikes of traffic" - Elasticity
When discussing features with stakeholders I prefer using "Quality Attributes" instead to clearly indicate the importance of those properties.
In the end "Business Requirements" and "Product Expectations" drive the technical architecture of a system and the "Quality Attributes" to consider when implement the architecture.
Some examples of those "Quality Attributes" or "ilities":
Observability: How easy is to know what's happening? Using OpenTelemetry could answer that question.
Scalability: How easy is to grow over time? For example will the selected datastore support new users over time?
Agility: How easy/quickly can we deliver new features to our servers? Is deployment a complicated process?
Security: Are we preventing unauthorized access? Is network connectivity encrypted? How much information services share?
Availability: What's the probability our system will be available for our systems? 99% 99.9% 99.99% Service Level Indicators (SLI) and Service Level Objectives (SLO) are used for this property.
Localizability: Internationalization (i18n) and Localization (l10n). Can the system be adapted to support different regions? Countries? Languages? Currency: USD, CAD, EUR, MXN?
Fault Tolerance: Can the system be operated in some event of failure? Does it degrade gracefully?
Elasticity: Can the system adapt to workload changes automatically? Does it scale-out / scale horizontally?
Extensibility: How easy/difficult is to add new functionality? Is our code idiomatic? Well organized? With proper abstractions? Or a big ball of mud?
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00:00 - Start
00:10 - What are Quality Attributes / Non-Functional Requirements in Software Architecture?
00:22 - What are Functional Requirements in Software Architecture?
00:33 - Examples of both Functional and Non-Functional Requirements?
01:17 - Requirements as how the user sees them
01:38 - Referring as Quality Attributes instead of Non-Functional Requirements
02:09 - Software Architecture ilities
04:21 - There are a lot of ilities
04:44 - How to determine ilities or Quality Attributes?
06:45 - Conclusions
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