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Analysis & Design, Architectures, Analysis \(->\) Design - Coggle…

- - - - Actors: people or other systems
        Use case: task
        include: (A -> B) A resumes after B completes
        extends: (A <- B) All of the As will be performed during the execution of B
        precedes: (A -> B) A must be done completely before executing B
        invoke: (A <- B) A happens during the lifespan of B
      - Tips
        
        Use active voice
        
        Write use case using event/response flow using both sides of the user/system dialogue
        
        Runtime behavior only
        
        Follow the context of the domain diagram
    - - Domain Diagram
        
        General Relationship
        
        Domain Dictionary: nouns/noun phrases that correspond with real world objects
        
        Tips
        
        The system and Screen/GUI are not real-world object.
        
        limit the time spent on the initial model to a couple of hours
        
        This is not a data model
        
        Object (single instance) is not a database table (collection of things)
        
        Actual classes doesn't have to be matched with the domain model exactly
        
        Box: real-world objects
        
        Aggregation: 'has-a' relationship
        
        Generalization: 'is-a' relationship
    - - Levels
        
        Level 1
        
        Divide the giant oval from the context diagram into the multiple sub-processes
        
        Choose a data and focus on its flow
        
        Level 2
        
        Sub-divide the processes from Level 1 into more details
        
        Choose a process from level 1, and focus on its internal processes
        
        Level n
        
        Sub-divide the processes from the parent level
        
        Level 0: Context Diagram
        
        There is only one oval at the center, and this represents the system as a whole.
        
        Focus on the interaction between external entities and the entire system
      - Box: Entity. Must be a noun
        
        Arrow: The data and its direction. Must be a noun
        
        Oval: The Process. Must be a verb
        
        Horizontal Parallel Line Segments: Database
- - - - Box: Data Entity (nouns)
        
        Rhombus: Relationship. Only can be connected with Data Entity on both sides (verbs)
        
        Oval: Attributes. Only can be connected with Data Entity
- - - - Fat Client
        
        More processing power
        
        Weak server
        
        Unreliable internet
        
        Network connection is expensive
      - Thin Client
        
        "dumb" client. Displaying info
        
        Constrained resources on device
        
        Powerful/economic server
        
        Websites
        
        Reliable Internet