CSE460 Lecture 29

Software Analysis and Design
Architecture Patterns
(202011)

Transcript

1. jgs
   CSE 460
   Software Analysis and Design
   Lecture 29: Architecture Patterns
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

   View Slide

2. jgs
   Previously …
   

   View Slide

3. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 3
   jgs
   Drafting an Implementation
   

   View Slide

4. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 4
   jgs
   Example
   Main
   Factory
   Controller View
   Model
   Gift Ball Box Envelop
   

   View Slide

5. jgs
   Layered Architecture
   

   View Slide

6. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 6
   jgs
   A generic layered architecture
   

   View Slide

7. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 7
   jgs
   Layered Architecture
   

   View Slide

8. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 8
   jgs
   Layered Architecture
   Description
   § Organizes the system into layers with related functionality associated with each
   layer.
   § A layer provides services to the layer above it, so the lowest-level layers
   represent core services that are likely to be used throughout the system.
   When used
   § Building new facilities on top of existing systems
   § The development is spread across several teams with each team responsibility for
   a layer of functionality
   Advantages § Allows replacement of entire layers so long as the interface is maintained.
   Disadvantages
   § In practice, providing a clean separation between layers is often difficult and a
   high-level layer may have to interact directly with lower-level layers rather than
   through the layer immediately below it.
   § Performance can be a problem because of multiple levels of interpretation of a
   service request as it is processed at each layer.
   

   View Slide

9. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 9
   jgs
   Example
   Factory
   Main
   Gift Ball Box Envelop
   Layer
   Layer
   Layer
   

   View Slide

10. jgs
    Blackboard
    

    View Slide

11. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 11
    jgs
    Blackboard
    

    View Slide

12. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 12
    jgs
    Blackboard
    Description
    § All data in a system is managed in a central repository
    § Components do not interact directly, only through the repository.
    When used
    § When Large volumes of information are generated that has to be stored
    for a long time.
    § When the inclusion of data in the repository triggers an action or tool.
    Advantages
    § Components do not need to know of the existence of other components.
    § Changes made by one component can be propagated to all components.
    Disadvantages
    § The repository is a single point of failure so problems in the repository
    affect the whole system.
    § May be inefficiencies in organizing all communication through the
    repository.
    

    View Slide

13. Javier Gonzalez-Sanchez | CSE460 | Fall 2020 | 13
    jgs
    Drafting an Implementation
    

    View Slide

14. jgs
    To be Continued…
    

    View Slide

15. jgs
    CSE 460 Software Analysis and Design
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Fall 2020
    Disclaimer. These slides can only be used as study material for the class CSE460 at ASU. They cannot be distributed or used for another purpose.
    

    View Slide