Strategy Design Pattern
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Design patterns: Strategy Pattern The strategy pattern is a software design pattern that enables an algorithm's behavior to be selected at run time.
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Strategy Pattern
The document discusses the strategy pattern, which defines a family of algorithms, encapsulates each one, and makes them interchangeable. This allows the algorithm to vary independently from clients that use it. The strategy pattern is applicable when there is a need for multiple classes that differ only in their behavior. It allows selecting different algorithms at runtime for common situations where classes vary by behavior.
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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 .
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Strategy Pattern
The document discusses the strategy pattern, which defines a family of algorithms, encapsulates each one, and makes them interchangeable. This allows the algorithm to vary independently from clients that use it. The strategy pattern is applicable when there is a need for multiple classes that differ only in their behavior. It allows selecting different algorithms at runtime for common situations where classes vary by behavior.
DESIGN PATTERNS: Strategy Patterns
In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns.
Template pattern
The template method pattern defines a skeleton of an algorithm in an operation, deferring some steps to subclasses. It avoids code duplication by implementing variations of an algorithm in subclasses. Some examples of template patterns include chain of responsibility, command, interpreter, and iterator. The template method pattern defines a template operation that contains abstract and concrete methods. Subclasses implement the abstract methods while calling the concrete methods defined in the superclass. This allows common behavior to be defined while allowing subclasses to provide specific steps.
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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 .
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Singleton design pattern
Name : Prasoon Dadhich
USN : 1MS09IS069
CODE
#include <iostream>
using namespace std;
class Singleton
{
private:
static bool instanceFlag;
static Singleton *single;
Singleton()
{
//private constructor
}
public:
static Singleton* getInstance();
void method();
~Singleton()
{
instanceFlag = false;
}
};
bool Singleton::instanceFlag = false;
Singleton* Singleton::single = NULL;
Singleton* Singleton::getInstance()
{
if(! instanceFlag)
{
single = new Singleton();
instanceFlag = true;
return single;
}
else
{
return single;
}
}
void Singleton::method()
{
cout << "Method of the singleton class" << endl;
}
int main()
{
Singleton *sc1,*sc2;
sc1 = Singleton::getInstance();
sc1->method();
sc2 = Singleton::getInstance();
sc2->method();
return 0;
}
Explanation
If we create any object of this class then the static object (player) will be returned and assigned to the new object.
Finally only one object will be there. The point is not how many times something gets executed, the point is, that the work is done by a single instance of the the class. This is ensured by the class method Singleton::getInstance().
As you can see in the above code,Client can access any instance of the singleton only through the getInstance() method.Once an instance is created,the instanceFlag value becomes true and then any further objects pointers created will be given the reference to the same object that has been created.
Also,make sure you notice the presence of a private constructor.This ensures that no new objects of the class are created and that all the class pointers get the same reference to work on.
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The template method pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. This allows subclasses to redefine certain steps of the algorithm while preserving its overall structure. For example, in a game application, the template method pattern could define a playOneGame method containing the overall game play logic, with abstract methods for game initialization, player turns, and end checking that subclasses implement differently for each specific game like Chess and Monopoly. Hook methods allow subclasses optional control over whether to implement additional template method steps.
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This document provides an introduction to design patterns. It begins by explaining what design patterns are, their benefits, and common elements of design patterns like name, problem, solution, and consequences. It then discusses different types of design patterns classified by purpose (creational, structural, behavioral) and scope (class, object). An example of applying the strategy pattern to a duck simulation is used to illustrate how patterns can solve common object-oriented design problems by separating variable aspects from those that remain the same. The document advocates programming to interfaces rather than implementations to avoid tight coupling and allow independent extension of behavior.
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This document provides an overview of design patterns including their definition, utility, essential elements, and examples. It discusses creational patterns like singleton, factory, and builder. Structural patterns covered include adapter, proxy, and composite. Behavioral patterns like command and iterator are also introduced. The document is presented as a slideshow by Dr. Lilia Sfaxi on design patterns for software engineering.
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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.
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In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to one. This is useful when exactly one object is needed to coordinate actions across the system. The term comes from the mathematical concept of a singleton.
With Code in JAVA
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The document provides an overview of the GoF design patterns including the types (creational, structural, behavioral), examples of common patterns like factory, abstract factory, singleton, adapter, facade, iterator, observer, and strategy, and UML diagrams illustrating how the patterns can be implemented. Key aspects of each pattern like intent, relationships, pros and cons are discussed at a high level. The document is intended to introduce software engineers to design patterns and how they can be applied.
Design pattern & categories
Design patterns provide reusable solutions for common problems that occur during software design. There are three main categories of design patterns: creational patterns, which deal with object creation mechanisms; structural patterns, which deal with relationships between entities; and behavioral patterns, which deal with communication between entities. Each design pattern has a name, identifies a problem, proposes a solution to that problem, and outlines the consequences of implementing that solution. Design patterns improve code reuse, documentation, communication between developers, and the transition to object-oriented design. However, patterns do not directly enable code reuse and integrating patterns requires significant human effort.
Singleton design pattern
Name : Prasoon Dadhich
USN : 1MS09IS069
CODE
#include <iostream>
using namespace std;
class Singleton
{
private:
static bool instanceFlag;
static Singleton *single;
Singleton()
{
//private constructor
}
public:
static Singleton* getInstance();
void method();
~Singleton()
{
instanceFlag = false;
}
};
bool Singleton::instanceFlag = false;
Singleton* Singleton::single = NULL;
Singleton* Singleton::getInstance()
{
if(! instanceFlag)
{
single = new Singleton();
instanceFlag = true;
return single;
}
else
{
return single;
}
}
void Singleton::method()
{
cout << "Method of the singleton class" << endl;
}
int main()
{
Singleton *sc1,*sc2;
sc1 = Singleton::getInstance();
sc1->method();
sc2 = Singleton::getInstance();
sc2->method();
return 0;
}
Explanation
If we create any object of this class then the static object (player) will be returned and assigned to the new object.
Finally only one object will be there. The point is not how many times something gets executed, the point is, that the work is done by a single instance of the the class. This is ensured by the class method Singleton::getInstance().
As you can see in the above code,Client can access any instance of the singleton only through the getInstance() method.Once an instance is created,the instanceFlag value becomes true and then any further objects pointers created will be given the reference to the same object that has been created.
Also,make sure you notice the presence of a private constructor.This ensures that no new objects of the class are created and that all the class pointers get the same reference to work on.
Presentation on Template Method Design Pattern
The template method pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. This allows subclasses to redefine certain steps of the algorithm while preserving its overall structure. For example, in a game application, the template method pattern could define a playOneGame method containing the overall game play logic, with abstract methods for game initialization, player turns, and end checking that subclasses implement differently for each specific game like Chess and Monopoly. Hook methods allow subclasses optional control over whether to implement additional template method steps.
The Singleton Pattern Presentation
The Singleton pattern ensures that only one instance of a class is created, and provides a global access point to that instance. There are many objects that only need a single instance, such as thread pools, caches, and objects used for logging or managing preferences. The Singleton pattern solves problems that could occur from instantiating multiple instances of these objects, such as inconsistent behavior or wasted resources. It works by having a class define a static method that returns its sole instance, which is created the first time the method is called.
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This document discusses the observer design pattern. It defines the observer pattern as establishing a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. It provides examples of when to use the observer pattern, such as with a stock market notifying individual stocks of changes. The document outlines the structure of the observer pattern, provides class and sequence diagrams, and includes a code demo of implementing the observer pattern with products and subscribers.
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This document discusses design patterns, including their definition, elements, and relationship to frameworks. It provides an overview of design patterns, describing them as general and reusable solutions to common software problems. The document outlines the core elements of patterns, such as their name, problem, context, solution, and examples. It also discusses different categories of patterns, such as creational, structural, and behavioral patterns.
Gof design pattern
The document discusses various design patterns. It begins by explaining that design patterns represent best practices used by experienced software developers to solve common problems. It then discusses the Gang of Four (GOF) patterns, which were identified in 1994 and include creational, structural, and behavioral patterns. Creational patterns like Singleton, Factory Method, Abstract Factory, and Prototype are covered. Structural patterns like Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy are also introduced. Behavioral patterns like Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, and Visitor are briefly mentioned as well. The document then discusses some Java Enterprise
Observer design pattern
This document discusses the observer design pattern. It defines the observer pattern as defining a one-to-many dependency between objects so that when one object changes state, all its dependents are notified. It provides class and sequence diagrams to illustrate the pattern. It also discusses implementing the observer pattern in Java using the built-in Observable and Observer classes.
Uml diagrams usecase
Use case diagrams are used to visualize how actors interact with a system's functions. They identify the actors, functions (use cases), and relationships between actors and functions. This document discusses the key components of use case diagrams including actors, use cases, system boundary, packages, and relationship types. It provides examples of how use case diagrams are used to gather requirements and provide overviews of system functionality and actor interactions.
Introduction to design patterns
This document provides an introduction to design patterns. It begins by explaining what design patterns are, their benefits, and common elements of design patterns like name, problem, solution, and consequences. It then discusses different types of design patterns classified by purpose (creational, structural, behavioral) and scope (class, object). An example of applying the strategy pattern to a duck simulation is used to illustrate how patterns can solve common object-oriented design problems by separating variable aspects from those that remain the same. The document advocates programming to interfaces rather than implementations to avoid tight coupling and allow independent extension of behavior.
Java Design Patterns Tutorial | Edureka
This document discusses different types of design patterns including creational, structural, behavioral, and Java EE design patterns. It provides examples of common design patterns like factory, singleton, strategy, observer, MVC, and DAO. Design patterns help provide reusable solutions to common problems in software design, promote code reuse, improve code quality and maintainability, and define standard ways to solve problems.
Facade pattern
This document discusses the facade design pattern. The facade pattern provides a simplified interface to a more complex subsystem. It decouples the subsystem from the client and makes the subsystem easier to use. A facade acts as a front-facing interface that hides the underlying complexities of the subsystem and delegates client requests to appropriate subsystem classes. This reduces dependencies between subsystems and promotes loose coupling. The facade pattern is useful for layering subsystems and simplifying access to them through a single interface.
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This session covers details on What is a design pattern, Why Design pattern, When to use design pattern, Types of Design Pattern....etc.
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in these slides i have explained the factory method design pattern. slides contains complete notes on this pattern from definition to implementation by code example.
Observer pattern
The Observer pattern defines a one-to-many dependency between a subject and any number of observers, such that when the subject's state changes, all observers are notified and updated automatically. It allows one to vary and reuse subject and observer objects independently. The pattern decouples subjects and observers, with subjects maintaining references to observers and notifying them of state changes via a common interface. It is used when a change to one object requires changing others and the number changing is unknown.
Java Collections
This document discusses Java collections framework and various collection classes like ArrayList, LinkedList, HashSet, HashMap etc. It provides definitions and examples of commonly used collection interfaces like List, Set and Map. It explains key features of different collection classes like order, duplicates allowed, synchronization etc. Iterators and generic types are also covered with examples to iterate and create typed collection classes.
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国外毕业证学位证成绩单办理方法：
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4毕业证成绩单电子版您确认信息无误之后安排制作成品；
5成品做好拍照或者视频给您确认；
6快递给客户（国内顺丰国外DHLUPS等快读邮寄）。
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Strategy Design Pattern
- 1. http://jy aasa.comCopyright 2016. Jyaasa Technologies. Strategy Pattern
- 2. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Ganesh Kunwar Sr. Software Engineer Jyaasa Technologies
- 3. Copyright 2016. Jyaasa Technologies. http://jy aasa.com What is Strategy Pattern?
- 4. Copyright 2016. Jyaasa Technologies. http://jy aasa.com
- 5. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Ktm Butwal Taxi Plan Taxi Ktm. Airport Bhairahawa Airport Ktm Butwal Taxi Bus Kalanki Ktm Butwal Taxi Bus BusKalanki Chitwan Strategy 1 Strategy 2 Strategy 3
- 6. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Wikipedia Definition the strategy pattern (also known as the policy pattern) is a software design pattern that enables an algorithm's behavior to be selected at runtime. The strategy pattern ● defines a family of algorithms, ● encapsulates each algorithm, and ● makes the algorithms interchangeable within that family.
- 7. Copyright 2016. Jyaasa Technologies. http://jy aasa.com When to Use? Shopping Mall Example - Accept customer detail - Calculate bill amount - Apply discount based on the day of week - Monday - High discount (10%) - Friday - Low discount (5%)
- 8. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Where does the discount logic reside? Inside ShoppingMall class Or Outside ShoppingMall class
- 9. Copyright 2016. Jyaasa Technologies. http://jy aasa.com
- 10. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Open closed principle - software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification - New discount logic may be applied in future - Not reusable - Same discount strategy can be use in other shopping mall
- 11. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Separate discount logic from ShoppingMall class
- 12. Copyright 2016. Jyaasa Technologies. http://jy aasa.com Context Strategy
- 13. Copyright 2016. Jyaasa Technologies. http://jy aasa.com
- 14. Copyright 2016. Jyaasa Technologies. http://jy aasa.com => grill = Grill.new(HotDog.new) => grill.grilling # => "Grilling the hot dogs!" => grill.food = Hamburger.new => grill.grilling # => "Grilling the hamburgers!" => grill.food = VeggiePatty.new => grill.grilling # => "Grilling the veggie patties!"
- 15. Copyright 2016. Jyaasa Technologies. http://jy aasa.com References - https://dockyard.com/blog/2013/07/25/design-patterns-strategy-pattern - https://en.wikipedia.org/wiki/Strategy_pattern - https://sourcemaking.com/design_patterns/strategy
- 16. Thank you! Lets Discuss github.com/glunwar @gkunwar1 Copyright 2015. Jyaasa Technologies.Copyright 2016. Jyaasa Technologies. http://jyaasa.com