Patterns - More than Mere Stencils
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Patterns More than Mere Stencils
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This presentation is an introduction to patterns for software development using Sparx Systems Enterprise Architect. The presentation starts with GoF design patterns and then moves to up to business architecture patterns.
Transcript of Patterns - More than Mere Stencils
PatternsMore than Mere Stencils
Stencils
What is a pattern?
We use patterns to do repeatable work quickly and easily.
Important Elements of Patterns:
Context
Important Elements of Patterns:
They apply at many levels
Important Elements of Patterns:
Domain Specific Languages
Important Elements of Patterns:
Patterns are a two way street
“Drawings help people to work out intricate relationships between parts.” - Christopher Alexander
What’s Our Game Plan?Design Patterns
Architectural Patterns
Analysis Patterns
SOA Patterns
Business Architecture
Patterns
Creational Patterns
These design patterns are all about class instantiation. These patterns can be further divided into class-creation patterns and object-creational patterns. While class-creation patterns use inheritance effectively in the instantiation process, object-creation patterns use delegation effectively to get the job done.
Behavioural Patterns
These design patterns are all about class objects’ communication. Behavioural patterns are those patterns that are most specifically concerned with communication between objects.
Structural Patterns
These design patterns are all about class and object composition. Structural class-creation patterns use inheritance to compose interfaces. Structural object-patterns define ways to compose objects to obtain new functionality.
Use in Enterprise Architect
1 23
An object-oriented state machine
State Pattern
Context
+ Request()state->Handle()
State
+ Handle()
ConcreteStateA
+ Handle()
ConcreteStateB
+ Handle()
-state
An object-oriented state machine
State Pattern
Architectural Patterns
Model-View-Controller
Architectural Patterns
Application of Model-View-Controller
Architectural Patterns
Let’s compose the Model-View-Controller
Adding Patterns to EA
Bring up the Resources window: View -> More Project Tools -> Project Resources
Then…
Till this point we’ve been down in the weeds and seeds
“Patterns are a starting point, not a destination” - Martin Fowler
Analysis Level Patterns
Accounting - Posting
Event
Processor
+ Process(Event)
AccountingEntryreads creates
http://martinfowler.com/apsupp/accounting.pdf
Analysis Level Patterns
Workflow Pattern Categories
Workflow Pattern Categories
1. Control2. Resource3. Data4. Exception Handling
Workflow Pattern Example
Simple Merge
Analysis Level Patterns
Program Management Patterns
Australian Government Use of Patterns
Brokered Authentication Pattern
An example of a business model from Tom Graves (see http://weblog.tomgraves.org)
Mapping Osterwalder’s Business Model Canvas to Archimate
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