#Decorator design pattern uml

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The Decorator Pattern Tutorial with Java Example You've Been Waiting For | Compare it with Strategy Pattern

Full Video link https://youtu.be/CJ-EDREomJ0 Hello friends, #Decoratorpattern video in #JavaDesignPatterns is published on #codeonedigest #youtube channel. This video covers topics 1. What is #Decoratordesignpattern? 2. What is the use of Decorator #de

Decorator design pattern is to allow additional responsibility to object at the run time. Use Decorator pattern whenever sub-classing is not possible. Decorator pattern provides more flexibility than static inheritance. Decorator pattern simplifies the coding. Decorator design pattern allows the extension of object by adding new classes for new behavior or responsibility. Decorator pattern is a…

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Discover the modern implementation of design patterns with C# and .NET

What you’ll learn

Recognize and apply design patterns

Refactor existing designs to use design patterns

Reason about applicability and usability of design patterns

Requirements

Good understanding of C#

Familiarity with latest C# features

Good understanding of object-oriented design principles

Description

Course Overview

This course provides a comprehensive overview of Design Patterns in C# and .NET from a practical perspective. This course in particular covers patterns with the use of:

The latest versions of C# and the .NET framework

Use of modern programming approaches: dependency injection, reactive programming and more

Use of modern developer tools such as ReSharper

Discussions of pattern variations and alternative approaches

This course provides an overview of all the Gang of Four (GoF) design patterns as outlined in their seminal book, together with modern-day variations, adjustments, discussions of intrinsic use of patterns in the language.

What are Design Patterns?

Design Patterns are reusable solutions to common programming problems. They were popularized with the 1994 book Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, John Vlissides, Ralph Johnson and Richard Helm (who are commonly known as a Gang of Four, hence the GoF acronym).

The original book was written using C++ and Smalltalk as examples, but since then, design patterns have been adapted to every programming language imaginable: C#, Java, PHP and even programming languages that aren’t strictly object-oriented, such as JavaScript.

The appeal of design patterns is immortal: we see them in libraries, some of them are intrinsic in programming languages, and you probably use them on a daily basis even if you don’t realize they are there.

What Patterns Does This Course Cover?

This course covers all the GoF design patterns. In fact, here’s the full list of what is covered:

SOLID Design Principles: Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, Interface Segregation Principle and Dependency Inversion Principle

Creational Design Patterns: Builder, Factories (Factory Method and Abstract Factory), Prototype and Singleton

Structrural Design Patterns: Adapter, Bridge, Composite, Decorator, Façade, Flyweight and Proxy

Behavioral Design Patterns: Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Null Object, Observer, State, Strategy, Template Method and Visitor

Who Is the Course For?

This course is for .NET/C# developers who want to see not just textbook examples of design patterns, but also the different variations and tricks that can be applied to implement design patterns in a modern way. For example, the introduction of the DLR allows us to use an ImpromptuObject, so that our DynamicObject exposes any interface we desire. This allows for dynamic programming, and many design patterns are presented in terms of their static and DLR-based variations.

Presentation Style

This course is presented as a (very large) series of live demonstrations being done in Microsoft Visual Studio. Most demos are single-file, so you can download the file attached to the lesson and run it in Visual Studio, Visual Studio Code, Rider or another IDE of your choice.

This course does not use UML class diagrams; all of demos are live coding. I use Visual Studio, various NuGet packages, R# unit test runner and even dotMemoryUnit.

Who this course is for:

Beginner and experienced developers

Anyone interested in design patterns

Created by Dmitri Nesteruk Last updated 3/2019 English English [Auto-generated]

Size: 1.94 GB

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The post Design Patterns in C# and .NET appeared first on Free Course Lab.

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CPSC 410: Advanced Software Engineering

Instructor: Thomas Fritz

In every aspect, this course was the continuation of CPSC 310. There were some overlap between the two, including lectures that covered:

- specifications (informal vs. formal specifications, with user stories as informal specifications)

- some design patterns (observer, composite, etc.)

- SOLID principles

- testing (test coverage with statement/branch/path/multiple condition coverage)

- UML diagrams

- code metrics

- non-functional properties

The topics that weren’t covered in 310 include:

- architectural styles (layered, pipe & filter, blackboard, microservices, etc.)

- more design patterns (decorator, state, strategy, template method, etc.)

- component/deployment diagrams

- REST APIs

- MVP/MVC/MVVM

- distributed systems

- cloud services

- release & deployment

A lot of the topics, such as design patterns and architectural styles, were covered at a high-level so we thought of how to design it (using UML diagrams or whatever type of diagram you prefer to use to display the components and the connections between them) rather than how to implement them. CPSC 410 is about software design and one of the takeaways from this course is that there is no real “right” answer. Quoting from The Pragmatic Programmer book, “there is no such thing as a best solution, be it a tool, a language, or an operating system. There can only  be systems that are more appropriate in a particular set of circumstances.” That is why exams had so many written responses as opposed to multiple choice questions. To come up with the most appropriate software design, you have to understand the system’s requirements well. Thus, the in-class activities and the exam problems were gave us real life scenarios that we were supposed to design a system for.

Grade breakdown is the following:

- Project: 50%

- Midterm: 10%

- Final Exam: 40%

As you can see, the project is a huge chunk of your grade. This is unsurprising considering how much effort the project was. Each group came up with their own idea for the project. The only course requirements for the project were:

1. You have to design your own REST API

2. It has to be a mobile app

3. App must not require crowd involvement (therefore, app should be useful for as few as two users)

4. App must not be a database management (CRUD) app*

* While your app should have a back-end that the client can send requests to for purposes such as getting & retrieving information, it should also do more than that - something smart. If you are thinking this is a vague requirement, it’s best to discuss this with a TA since every project is different and this requirement, which expects your app to do something smart and complex, differs for every project.

The grading for the project is the formula:

(group project + bonus) * scale + individual = final project grade

Scale will range between 0.75 and 1.0. The components of the scaling mark will be determined by:

5: completeness (compared to proposal) 5: utility 5: polish 10: difficulty

My team focused on getting the points for difficulty and we were overambitious. Thus, we ended up promising too many things through our user stories and our grade for completeness suffered. That is why I advise those who take this course to be wiser when writing their user stories and be realistic about how time-consuming the user stories will be. Remember, each user story should only take several hours to a few days to complete.

Bonuses (2% each) were given out to the teams with the best pitch, best prototype demo, and best final demo. There’s also the 2% bonus given if you upload your app to a curated app store like Google Play Store or Apple’s App Store.

For the project, we started off with writing a project proposal which included the user stories. Then all the teams gave an in-class presentation on their proposals (5%), and we rated each team’s presentations (0.75%). We then documented and gave an oral assessment (in front of the instructors only) on the architecture & design, which included component, deployment, and UML diagrams as well as designing the REST API (14%). Then came the prototype demo in front of the class (5%) and we reviewed each other’s demos (0.75%). Testing & reflection came afterwards, where we wrote the front- and back-end tests with documentation and an oral assessment (14%). Lastly came the in-class project presentation (7.5%), app reviews again (0.75%), and the project video (2.5%).

I would say that this is the most time-consuming project I have embarked upon and performance is largely contingent on your group member’s abilities. We all had teams of 4 and we had weekly meetings with a TA to discuss our progress. Lectures were once a week from 5 - 8 p.m. Midterm and final exam was based on material covered in lecture, but similar to CPSC 310, expect a few questions on the final to be related to your project.

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The Decorator Pattern Tutorial with Java Example You've Been Waiting For..

The Decorator Pattern Tutorial with Java Example You’ve Been Waiting For..

Decorator design pattern is to allow additional responsibility to object at the run time. Use Decorator pattern whenever sub-classing is not possible. Decorator pattern provides more flexibility than static inheritance. Decorator pattern simplifies the coding. Decorator design pattern allows the extension of object by adding new classes for new behavior or responsibility. Decorator pattern is a…