Creational patterns deal with object creation and aim to create objects in a suitable manner. There are three main creational patterns: the factory pattern, which provides a consistent interface for creating properly configured objects; the abstract factory pattern, which is a factory for factories and handles more complex situations; and the singleton pattern, which ensures a single instance of an object and consistency of data by restricting object instantiation.
Je vous partage l'un des présentations que j'ai réalisé lorsque j'étais élève ingénieur pour le module 'Anglais Business ' , utile pour les étudiants souhaitant préparer une présentation en anglais sur les Design Pattern - ou les patrons de conception .
Je vous partage l'un des présentations que j'ai réalisé lorsque j'étais élève ingénieur pour le module 'Anglais Business ' , utile pour les étudiants souhaitant préparer une présentation en anglais sur les Design Pattern - ou les patrons de conception .
An introduction to structural design patterns in object orientation. Suitable for intermediate to advanced computing students and those studying software engineering.
Design patterns are optimized, reusable solutions to the programming problems that we encounter every day. A design pattern is not a class or a library that we can simply plug into our system; it's much more than that. It is a template that has to be implemented in the correct situation. It's not language-specific either. A good design pattern should be implementable in most—if not all—languages, depending on the capabilities of the language. Most importantly, any design pattern can be a double-edged sword— if implemented in the wrong place, it can be disastrous and create many problems for you. However, implemented in the right place, at the right time, it can be your savior.
An introduction to creational design patterns in object orientation. Suitable for intermediate to advanced computing students and those studying software engineering.
An introduction to structural design patterns in object orientation. Suitable for intermediate to advanced computing students and those studying software engineering.
Design patterns are optimized, reusable solutions to the programming problems that we encounter every day. A design pattern is not a class or a library that we can simply plug into our system; it's much more than that. It is a template that has to be implemented in the correct situation. It's not language-specific either. A good design pattern should be implementable in most—if not all—languages, depending on the capabilities of the language. Most importantly, any design pattern can be a double-edged sword— if implemented in the wrong place, it can be disastrous and create many problems for you. However, implemented in the right place, at the right time, it can be your savior.
An introduction to creational design patterns in object orientation. Suitable for intermediate to advanced computing students and those studying software engineering.
Why Design Patterns Are Important In Software EngineeringProtelo, Inc.
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Patterns and Anti-patterns
How to learn design patterns?
Categories of GoF patterns
The Fundamental theorem of software engineering
Real-world problems and how design patterns solve them with GoF structural patterns
Patterns (contd)Software Development ProcessDesign patte.docxdanhaley45372
Patterns (contd)
Software Development Process
Design patterns used to handle change
More time extending and changing code than developing it.
The Strategy design pattern handle change by selecting from a family of external algorithms rather than rewrite.
Design point: Make code closed for modification of code, but open for extension
Problem
Computer object created
Description Method returns
Getting a Computer
Problem
Program has to change every time
Customer changes options
Decorator Pattern
Wrapper code used to extend your core code
Extend a class dynamically at runtime
Decorator uses wrapper code to extend core functionality - decorating the code
Decorator Pattern
description() returns “You are getting a computer”
Wrapper description() returns
“You are getting a computer and a disk”
Wrapper description() returns
“You are getting a computer and a disk and a monitor”
Decorator Pattern
Core component: Computer
Variables holding computer objects should also be able to hold objects that wrap computer objects.
Extend the wrapper classes from the Computer class.
Abstract class cannot be instantiated
Ensures all wrappers are consistent
Developers have to provide their own description
Decorator Pattern
Method calls the core computer object’s
description method and adds “and a disk”
Decorator Pattern
Method calls the core computer object’s
description method and adds “and a disk”
Extend the core object by wrapping it in decorator wrappers. Avoids modification of the core code.
Each successive wrapper called the description method of the object it wrapped and added something to it.
Factory Pattern
Based on type, call the
Connection method
Factory Pattern
Create a method that returns the
correct connection type
Factory Pattern
New operator used to create OracleConnection objects.
New operator used to create SqlServerConnection objects, and MySqlConnection objects.
New operator to instantiate many different concrete classes
Code becomes larger and needs to be replicated in many places
Factor that code out into a method.
Code keeps changing
Encapsulate code into a factory object
Goal: Separate out the changeable code and leave the core code closed for modification
Building the Factory
Creating the Factory
FirstFactory class encapsulates the connection object creation
Pass to it the type of connection (“Oracle”, “SQL Server”,)
Use the factory object to create connection objects with a factory method named createConnection
Building the Factory
Create the FirstFactory class.
Save the type of the database, passed to the FirstFactory class’s constructor.
Object-creation code changes
Check which type of object to be created
(OracleConnection, SqlServerConnection,
and then create it.
Factory Class
Create the Abstract Connection Class
Core code should not be modified or has to be modified
as little as possible.
Using the connection object returned by the
new factory object
Use t.
Singleton Design Pattern - Creation PatternSeerat Malik
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Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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2. Contents
Introduction
Types of Creational Pattern
Why use Creational Pattern
The Factory Pattern
The factory Design Pattern
Abstract factory
The Singleton
Summary
References
3. Introduction
Creational design patterns are design
patterns that deal with object creation
mechanisms, trying to create objects in a
manner suitable to the situation.
4. Creational Patterns
There are three creational patterns
The Factory
The Abstract Factory
The Singleton
5. Why Use A Creational Pattern?
Some situations are more complex than simple
instantiation can handle.
Imagine for example you want to create an entirely ‘
skinnable’ look and feel for an application.
Some situations have complex consequences if
objects aren’t instantiated in the right way or the
right order.
Some situations require that only one object is
ever created.
6. The Factory Pattern
The Factory is used to provide a consistent
interface to setup properly configured objects.
It can be represented by a single class
containing a single static method.
More complex factories exist, dealing with more
complex situations.
8. The Factory Design Pattern
Now imagine you are creating a simple
drawing package.
User selects a shape
User clicks on the screen
Application draws the shape.
This can all be hard-coded directly into an
application.
9. The Factory Design Pattern
Instead, we use a factory to generate specific
objects, through the power of polymorphism.
Polymorphism is key to the way a Factory works.
The system that drives a factory is that all these
shapes have a common parent class.
All we need is the Shape object that is
represented by specific objects.
10. Another Example
Let’s say we have a file that we have created
in our application.
We now want to export it to a different file
format.
Each file format has its own peculiarities.
We could hard-code this into our application.
11. The Factory Design Pattern
The Factory Pattern reduces hard-coded
complexity.
The Factory Pattern properly devolves
responsibility to individual objects.
However, the Factory pattern by itself is
limited to certain simple contexts.
12. The Abstract Factory
The next level of abstraction is the Abstract
Factory.
This is a Factory for factories.
Imagine here we have slightly more
complicated situations.
Designing an interface that allows for
different themes.
A file conversion application that must allow
for different versions of different formats.
13. The Abstract Factory
We could handle these with a factory by itself.
This introduces the same combinatorial
problems that the factory is designed to
resolve.
A simple rule to remember is – coding
combinations is usually bad design.
Bad design causes trouble later on.
When doing anything more substantial than
simple ‘proof of concept’ applications.
14. The Consequence
Entirely new suites of themes can be added to
this system without risking combinatorial
explosion.
The ‘operational’ code is also much tighter and
more focused.
15. The Singleton
The Factory and Abstract Factory handle
structural creation issues.
They fix several aspects of bad design with
regards to creating objects.
The Singleton is designed to increase data
consistency.
One of the problems that must be managed
with object orientation is inter-object
communication.
16. The Singleton
This is fine in most situations.
However, when dealing with objects that
contain ‘live data’, it becomes problematic.
Each object has its own copy of the data.
It would be much better if all objects had
access to the same copy of the data.
That is hard to manage effectively.
17. The Singleton
The Singleton pattern resolves this by ensuring a
single interface to the creation of an object.
Objects cannot be created with new, they must be
created through a method.
This method is responsible for ensuring only one
live version of an object.
If one exists, it sends that out.
If it doesn’t, it creates it and then sends it out.
The pattern is very simple.
But offers great improvements in data consistency.
18. Summary
Creational Patterns manage the complexity of
object instantiations.
They make it easier to manage the combinatorial
explosion that comes along with certain kinds of
object creation schemes.
The Factory allows for the creation of
properly configured objects.
The Abstract Factory is a factory for factories.
The Singleton ensures data consistency by
restricting instantiation of objects.
19. References
Presentation session notes including link to this
session, will be available on
http://learningaboutfudge.blogspot.com
All the source for this session is publically
available at:
https://github.com/SheepWorx/Training
RSS Feed:
http://learningaboutfudge.blogspot.com/feeds/post
s/default?alt=rss
Local Network: dmeyer-msharetrainingCode
Like a Ninja
Source was compiled using Visual Studio 2012
http://www.gofpatterns.com/
20. Thank You
Dr. Himanshu Hora
SRMS college of Engineering & Technology
Bareilly (UP) INDIA
