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ProgArk (Chapter 5: Availability (Detect faults (Ping/Echo, Timestamp,…

- - - - Passive redundancy
      - Spare
      - Exception handling
      - Rollback
      - Software upgrade
      - Retry
      - Ignore faulty behaviour
      - Degradation
      - Reconfiguration
      - Active redundancy
    - - Shadow
      - State resynchronization
      - Escalating restart
      - Non-stop forwarding
- - - - Partitions systems into implementation units, called modules
      - Assigned specific computational responsibilities
      - Allows us to answer questions about responsibilities, dependencies and inheritance of modules
      - Types
        
        Decomposition, spec modifiability
        
        Uses, spec modifiability
        
        Layer, spec portability
        
        Class, spec modifiability and reuse
        
        Data model, static information structure
    - - Focus on the way elements interact at runtime
      - Runtime entity
      - Helps us answer questions about interaction of major execution components at runtime, replicated parts of the system, progress of data through the system, parallel execution.
      - Types
        
        Service: system of services that interoperate by service coordination mechanism. Services can be developed anonymously and independent.
        
        Concurrency: determine opportunities for parallelism and locations for resource contention. The connectors are their communication mechanisms. The components are arranged into logical threads.
    - - Describes the mapping from software structures to the systems environment
        
        organizational
        
        developmental
        
        installation
        
        execution
      - Allocation views help us answer questions related to CPUs, directories, filed and development teams.
      - Types
        
        Deployment: How software elements are assigned to hardware processing and communication elements. Specifies performance, data integrity, security, availability.
        
        Implementation: How software elements are mapped to file structure or CM. Critical for manage implementation and build processes.
        
        Word assignment: How software elements are mapped to developers or development teams. Critical for project manager to plan development.
    - - An abstraction
        
        How the systems elements interact, are arranged/composed and what their properties are.
      - A structure is architectural if it supports reasoning about the system and its properties