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MVC and Other Design Patterns

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Jonathan Simon
Jonathan Simon

This document discusses the Model-View-Controller (MVC) pattern in the context of a DJ music application called DJView. It goes through multiple versions of the DJView code, refactoring it to better separate the model, view, and controller responsibilities according to MVC. The model manages the application data and logic. The view displays data and handles user input. The controller mediates between the model and view, updating the model based on user input and notifying the view of model changes.

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Design Patterns 05/28/10 Week 6: MVC and Other Patterns Jonathan Simon [email_address]
DJView ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DJView: Version 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DJView: Version 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 1 05/28/10
Requirement Change… ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
So.. ,[object Object],[object Object],[object Object],[object Object],05/28/10
Creating a Subject ,[object Object],[object Object],[object Object],[object Object],05/28/10
Subject = BeatModel ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BeatObserver and BPMObserver ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Changes???
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Does DJView have a direct reference : To sequencer? To bpm field?
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 What should we do with this DisplayBpm function? What interfaces does DJView need to implement? Remember BeatModel…
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 What are we missing?
DJView: Version2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Version 2 05/28/10 Notice beatObservers and bpmObservers in BeatModel.
View and Model ,[object Object],[object Object],[object Object],[object Object],05/28/10
Multiple Views w/One Model 05/28/10 Question: Does the Model know any specific details about the UI elements on the View?
Definition (Partial): Model ,[object Object],[object Object],[object Object],[object Object],05/28/10
Definition (Partial): View ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Requirement Change ,[object Object],[object Object],[object Object],05/28/10
DJView: Version 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],We know that we cannot re-use UI elements when we change Views.
Challenge ,[object Object],[object Object],[object Object],05/28/10
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Inheritance (cont) ,[object Object],[object Object],[object Object],05/28/10
Composition ,[object Object],[object Object],[object Object],[object Object],05/28/10
What about the Model? ,[object Object],[object Object],[object Object],05/28/10
DJView: Version 3 (Pt 1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Note: The only reason that View needs Model is for registering of events and getting state from Model.
DJView: Version 3 (Pt 2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 The View delegates all actions to the Controller.
DJView: Version 3 (Pt 3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 NOTE: If we have to port this View from Windows to Web, here is where the crux of our changes will occur.
BeatController ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Why???
BeatController ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Controller sends a message to Model to update data…and sends a message back to the View. Note: Not showing the Model here. It is exactly the same!
The Big Picture 05/28/10 See diagram on page 530.
Definition: Model ,[object Object],[object Object],[object Object],[object Object],05/28/10
Definition: View ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Definition: Controller ,[object Object],[object Object],[object Object],05/28/10
Lab: Part I ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lab: Part II ,[object Object],[object Object],05/28/10
Answer : Part I ,[object Object],[object Object],[object Object],[object Object],05/28/10
Answer: Part II ,[object Object],[object Object],[object Object],[object Object],05/28/10
Testing ,[object Object],[object Object],[object Object],05/28/10
Frameworks for MVC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Model View Presenter (MVP) ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Other Patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Iterator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Iterator (cont) ,[object Object],[object Object],[object Object],05/28/10
Composite ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Composite (cont) ,[object Object],[object Object],05/28/10
Builder ,[object Object],[object Object],[object Object],05/28/10
Facade ,[object Object],[object Object],05/28/10
State Pattern ,[object Object],[object Object],[object Object],05/28/10
Chain of Responsibility ,[object Object],[object Object],[object Object],05/28/10
Flyweight ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Memento ,[object Object],[object Object],05/28/10
Next Steps? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Martin Fowler ,[object Object],[object Object],[object Object],05/28/10

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MVC and Other Design Patterns

  • 1. Design Patterns 05/28/10 Week 6: MVC and Other Patterns Jonathan Simon [email_address]
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  • 7. DJView: Version 1 05/28/10
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  • 20. Version 2 05/28/10 Notice beatObservers and bpmObservers in BeatModel.
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  • 22. Multiple Views w/One Model 05/28/10 Question: Does the Model know any specific details about the UI elements on the View?
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  • 38. The Big Picture 05/28/10 See diagram on page 530.
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Editor's Notes

  1. 13 November 2008
  2. 5 places in DJView that would need to be modified to update the setting of BPM 13 November 2008
  3. Answer: Observer!! 13 November 2008
  4. BPM Beat 13 November 2008
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  6. We have a separation of View and Model. We would need to duplicate the order that things happen. For example, Constructor – CreateViews, Disable, Enable, then we initialize Model Same with Start and Stop. We send a message to the Model then set UI state. 13 November 2008
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