Composite Pattern
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The Composite pattern allows clients to treat primitive objects and containers of objects uniformly by composing them into tree structures. It allows clients to treat individual objects and compositions of objects in a uniform manner. The pattern allows clients to recursively compose objects into tree structures to represent part-whole hierarchies.
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Building sub-structure: Composite structural floor system, Leeds, UK
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- Modern innovations like steel frame construction, elevators, and electricity made tall buildings practical structures.
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City Centre ,Rohini ,Delhi ,Thesis project (2013)
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character of COMMERCE and CULTURE and to evolve a contemporary model of conventional
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The Factory Method pattern defines an interface for creating objects but allows subclasses to determine which object class to instantiate. This pattern encapsulates object creation and delegates it to subclasses, allowing classes to be extended without modifying the original code. The document also discusses why design patterns are useful, some strategies for using them like programming to interfaces, and themes and consequences of the Factory Method pattern like increased flexibility and eliminating hard-coded dependencies.
Abstract Factory Design Pattern
The abstract factory pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes. It allows a system to be independent of how its objects are created, composed, and represented. The abstract factory pattern is a creational pattern that allows for multiple types of products to be created through a common interface.
A Little Lisp
John McCarthy created LISP in 1958 as a mathematical notation for computer programs based on lambda calculus. LISP pioneered many concepts still used today like tree data structures, automatic storage management, and self-hosting compilers. It remains influential as one of the earliest functional programming languages.
State Pattern in Flex
The document discusses the state pattern, including:
- Allowing an object to change its behavior based on internal state changes, making it seem like the object is changing classes.
- Client code interacts with the context, which behaves differently depending on its current state.
- States are often singletons to avoid recreating state instances.
- States can access the context via a back pointer or by passing needed data via parameters.
- The state can be changed by client code, state instances, or the context itself.
Active Object
The Active Object design pattern decouples method execution from method invocation to enhance concurrency and simplify synchronized access to an object that resides in its own thread of control. It uses a proxy and servant model where method calls made on the proxy are queued and executed asynchronously by the servant in its own thread. This allows transparent leveraging of parallelism but can complicate debugging due to differences in invocation and execution order.
Extract Composite Talk Andy
The document describes refactoring code using the Composite pattern. Originally, two classes FormTag and LinkTag contained duplicate code for looping through child nodes. This was refactored by creating a common Composite base class with the looping behavior. FormTag and LinkTag were made subclasses of Composite. The child reference and looping method were pulled up from the subclasses to the new Composite class. This removed duplication while preserving the original interface.
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Composite Pattern
- 1. Structural Patterns - Composite Melbourne Patterns Group July 1 2009 Chris Bushell
- 2. Intent Allow clients to treat primitive objects and containers in the same way
- 3. Graphics Example • Line • Rectangle • Text etc.
- 4. Graphics Example Continued Graphic Line Rectangle Picture Line Rectangle
- 7. Participants • Component • Leaf • Composite
- 8. Participants
- 9. Code