A short introduction to the SOLID principles of Object Oriented Programming in (mostly) Dutch.
- Single responsibility
- Open/Closed
- Lishkov Substitution
- Interface Segregation
- Dependency Inversion
This presentation was given at a meetup for Working Spirit in Deventer.
Case Study: Practical tools and strategies for tackling legacy practices and ...Alejandro S.
In this talk you will learn how strategic tools like Wardley Maps, the C4 model and DDD’s strategic design helped a struggling CTO to fight against a crumbling monolith and the organizational practices that allowed its creation.
Among other things we will cover:
* How to plan, communicate and challenge strategies.
* Why strategy and thinking strategically is important for software developers.
* High-level overview of Simon Brown’s C4 Model
* High-level overview of DDD’s strategic design
* DDD Context Mapping
* High-level overview Wardley Maps.
* Wardley Maps: Landscape.
* FUN random facts about software development in startups :)
SOLID Principles of Refactoring Presentation - Inland Empire User GroupAdnan Masood
Abstract: SOLID is a mnemonic acronym coined by Robert C. Martin (aka Uncle Bob) referring to a collection of design principles of object-oriented programming and design. By using these principles, developers are much more likely to create a system that more maintainable and extensible. SOLID can be used to remove code smells by refactoring. In this session, you will learn about the following SOLID principles with code examples demonstrating the corresponding refactoring.
S – Single Responsibility Principle – An Object should have only one reason to change.
O – Open/Closed Principle – A software entity(module, library, routine) should be closed to any modification but be open to extension
L – Liskov Substitution Principle – Derived classes should be substitutable for the base classes
I – Interface Segregation Principle – Having more fine grained interfaces over fat interfaces
D – Dependency Inversion Principle – Depending on abstractions, not concrete implementations.
The document discusses object-oriented (OO) design principles. It defines design smells like rigidity, fragility, immobility, and viscosity that indicate poor design. It then explains principles for good OO design including the single responsibility principle (SRP), open/closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), and dependency inversion principle (DIP). SRP states a class should have one responsibility. OCP requires entities be open for extension but closed for modification. LSP defines inheritance and substitutability. ISP avoids fat interfaces. DIP inverts dependencies on abstractions, not concretions.
Omar A. Awad is a senior .Net developer seeking a development position. He has 5 years of experience in .Net application development and is proficient in technologies like C#, ASP.Net, SQL Server, and Visual Studio. He holds a BS in Computer Science and has worked on projects involving web and desktop applications, databases, and encryption software. He is a skilled programmer familiar with Agile methodologies and has experience teaching programming courses.
This document discusses principles and patterns of object-oriented software design. It begins by defining software architecture at different levels, from overall application structure down to module interconnections. The document then focuses on this module level, discussing principles like the Open-Closed Principle and Liskov Substitution Principle that guide object-oriented class design. Symptoms of deteriorating design like rigidity, fragility, immobility and viscosity are also described. The role of managing dependencies between modules to prevent architectural degradation is emphasized.
04 bob martin-designprinciplesandpatterns_engosasello
This document discusses principles and patterns for software architecture and dependency management. It begins by defining software architecture at different levels, from overall application structure down to modules and classes. It then discusses how software designs can deteriorate over time as requirements change unless dependencies between modules are properly managed. The main symptoms of deteriorating design are identified as rigidity, fragility, immobility, and viscosity. Object-oriented principles like the open/closed principle and abstraction are presented as ways to manage dependencies and allow software to adapt to changing requirements while maintaining a clean design.
The document discusses several object-oriented (OO) design principles including the single responsibility principle (SRP), open-closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), and dependency inversion principle (DIP). It also discusses design patterns, refactoring, and design by contract (DBC) as ways to prevent software decay over time and improve design quality. The key OO principles guide developers to create flexible, maintainable and reusable software designs.
Shift Remote FRONTEND: Micro Frontend Architecture: A Look Into the Future - ...Shift Conference
Good frontend development is hard. Scaling frontend development is even harder because you need to ensure that multiple teams can work on a big and complex project simultaneously and without any blockers. Today you often hear about micro frontends which are one of the more controversial Web topics. What are they? Are they worth all the fuzz? Should you implement them? As someone who worked at integrating this in Infobip’s Web Interface, I want to use our example to show you our way of thinking: how did we know that we have problems, how did we decide to approach the implementation of micro frontend architecture and why did we decide to go with it, and which problems we ran into. We will also look at alternate available possibilities useful for anyone.
Case Study: Practical tools and strategies for tackling legacy practices and ...Alejandro S.
In this talk you will learn how strategic tools like Wardley Maps, the C4 model and DDD’s strategic design helped a struggling CTO to fight against a crumbling monolith and the organizational practices that allowed its creation.
Among other things we will cover:
* How to plan, communicate and challenge strategies.
* Why strategy and thinking strategically is important for software developers.
* High-level overview of Simon Brown’s C4 Model
* High-level overview of DDD’s strategic design
* DDD Context Mapping
* High-level overview Wardley Maps.
* Wardley Maps: Landscape.
* FUN random facts about software development in startups :)
SOLID Principles of Refactoring Presentation - Inland Empire User GroupAdnan Masood
Abstract: SOLID is a mnemonic acronym coined by Robert C. Martin (aka Uncle Bob) referring to a collection of design principles of object-oriented programming and design. By using these principles, developers are much more likely to create a system that more maintainable and extensible. SOLID can be used to remove code smells by refactoring. In this session, you will learn about the following SOLID principles with code examples demonstrating the corresponding refactoring.
S – Single Responsibility Principle – An Object should have only one reason to change.
O – Open/Closed Principle – A software entity(module, library, routine) should be closed to any modification but be open to extension
L – Liskov Substitution Principle – Derived classes should be substitutable for the base classes
I – Interface Segregation Principle – Having more fine grained interfaces over fat interfaces
D – Dependency Inversion Principle – Depending on abstractions, not concrete implementations.
The document discusses object-oriented (OO) design principles. It defines design smells like rigidity, fragility, immobility, and viscosity that indicate poor design. It then explains principles for good OO design including the single responsibility principle (SRP), open/closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), and dependency inversion principle (DIP). SRP states a class should have one responsibility. OCP requires entities be open for extension but closed for modification. LSP defines inheritance and substitutability. ISP avoids fat interfaces. DIP inverts dependencies on abstractions, not concretions.
Omar A. Awad is a senior .Net developer seeking a development position. He has 5 years of experience in .Net application development and is proficient in technologies like C#, ASP.Net, SQL Server, and Visual Studio. He holds a BS in Computer Science and has worked on projects involving web and desktop applications, databases, and encryption software. He is a skilled programmer familiar with Agile methodologies and has experience teaching programming courses.
This document discusses principles and patterns of object-oriented software design. It begins by defining software architecture at different levels, from overall application structure down to module interconnections. The document then focuses on this module level, discussing principles like the Open-Closed Principle and Liskov Substitution Principle that guide object-oriented class design. Symptoms of deteriorating design like rigidity, fragility, immobility and viscosity are also described. The role of managing dependencies between modules to prevent architectural degradation is emphasized.
04 bob martin-designprinciplesandpatterns_engosasello
This document discusses principles and patterns for software architecture and dependency management. It begins by defining software architecture at different levels, from overall application structure down to modules and classes. It then discusses how software designs can deteriorate over time as requirements change unless dependencies between modules are properly managed. The main symptoms of deteriorating design are identified as rigidity, fragility, immobility, and viscosity. Object-oriented principles like the open/closed principle and abstraction are presented as ways to manage dependencies and allow software to adapt to changing requirements while maintaining a clean design.
The document discusses several object-oriented (OO) design principles including the single responsibility principle (SRP), open-closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), and dependency inversion principle (DIP). It also discusses design patterns, refactoring, and design by contract (DBC) as ways to prevent software decay over time and improve design quality. The key OO principles guide developers to create flexible, maintainable and reusable software designs.
Shift Remote FRONTEND: Micro Frontend Architecture: A Look Into the Future - ...Shift Conference
Good frontend development is hard. Scaling frontend development is even harder because you need to ensure that multiple teams can work on a big and complex project simultaneously and without any blockers. Today you often hear about micro frontends which are one of the more controversial Web topics. What are they? Are they worth all the fuzz? Should you implement them? As someone who worked at integrating this in Infobip’s Web Interface, I want to use our example to show you our way of thinking: how did we know that we have problems, how did we decide to approach the implementation of micro frontend architecture and why did we decide to go with it, and which problems we ran into. We will also look at alternate available possibilities useful for anyone.
A great idea can be built with almost any technology. The success or failure of your project has more to do with vision, leadership, execution, and market than technological choices.
Besides the vision, a lot of startups focus on culture. what isn’t often mentioned is that the technical decisions will have a direct effect on the company culture. Great things have been built with each of the technologies. But they do come with a culture.
The purpose of this presentation is to help developers, managers, founders, etc. to make an insightful decision about the framework they want to use to create their product.
SOLID is a popular set of five design principles for object-oriented software development. The principles are: Single Responsibility Principle, which states that a class should have one responsibility; Open/Closed Principle, which states that code should be open for extension but closed for modification; Liskov Substitution Principle, which states that subclasses should not break the functionality of parent classes; Interface Segregation Principle, which states that clients should not depend on interfaces they do not use; and Dependency Inversion Principle, which states that high-level modules should not depend on low-level modules and abstractions should not depend on details.
This document provides an overview and introduction to domain-driven design (DDD). It discusses the core principles of DDD, including focusing on modeling the domain, capturing domain knowledge in software models, and structuring software around domain concepts. The document also summarizes some common DDD patterns and techniques for managing complexity, such as ubiquitous language, layered architecture, aggregates, entities, value objects, services, factories, and repositories. The overall goal of DDD is to build software that is closely aligned with the conceptual model of the problem domain.
Secrets of going codeless - How to build enterprise apps without codingNewton Day Uploads
The document discusses methods for building enterprise applications without coding, known as codeless development or CAAD (Computer Aided Applications Development). It describes how CAAD uses pre-built components and templates to create applications through a point-and-click interface, removing the need for extensive programming. The methodology involves four phases - plan, develop, release, and review. Key aspects of the CAAD process include defining the application purpose and requirements, prototyping the design, user testing iterations, and ongoing maintenance after release. Site constructs provide predefined user interface elements to help bridge communication gaps between technical and non-technical users.
This document discusses micro frontends, which divide large web applications into independent, standalone units. It outlines the issues with traditional monolithic applications, such as increased complexity and difficulty scaling. Micro frontends address these issues by allowing independent teams to work on separate application pieces with different technologies. The document covers micro frontend design considerations, communication patterns between units, and technical implementations using Angular Elements and the Frint framework.
The most experienced and learned developers always suggest hiring an electron application development company when it comes to building applications for desktops. Why do they prefer Electron.js? What’s so special about it? This topic will attempt to shed some light on the answers to these questions.
1) The document discusses the Dependency Inversion Principle, which states that high-level modules should not depend on low-level modules, but that both should depend on abstractions. This reduces rigidity, fragility, and increases reusability of a design.
2) It provides an example of a "Copy" program that copies characters from a keyboard to a printer. The original design couples the high-level "Copy" module to the low-level input and output modules, making it inflexible.
3) Applying the Dependency Inversion Principle, the design is improved by making the "Copy" module depend on abstract "Reader" and "Writer" interfaces instead of specific implementations,
This course provides a detailed introduction to the Object Oriented techniques identified by Robert Martin as the SOLID principles of software design. Intended for both novice and intermediary developers, each of the five principles are fully defined and explored. Real-world coding examples are provided for each software tenant to help fully expound upon the design techniques. By the end of the session, developers will be able to identify common code smells while applying SOLID programming practices that ensure clean and maintainable code.
In this core java training session, you will learn Elements of Java programming. Topics covered in this session are:
• Quick review of some important concepts from last class
• History of Java
• JDK and JRE
• Byte Code and JVM (Java Virtual Machine)
• Platform Independence
• Principles of Object Oriented Programming
• Writing your first Java Application
• Elements of Java programming language
• Built in Data Types
• Conditional Statements
• Loops
For more information about this course visit on this link: https://www.mindsmapped.com/courses/software-development/learn-java-fundamentals-hands-on-training-on-core-java-concepts/
Software Architecture Erosion and Modernizationbmerkle
The document discusses software architecture erosion and strategies to address it. It begins by defining software architecture and architectural erosion. It then examines examples of architectural erosion in open source projects like FindBugs and Eclipse. The document advocates modeling software architecture and subsystems to detect violations. It also presents tools and approaches for architectural analysis to monitor changes and deviations over time. Finally, it discusses best practices for open source projects and Eclipse to limit architectural erosion through community involvement and defined processes.
"Up-Down Development & DSL-first approach", Владимир Мельник, DataArtDataArt
The document discusses Up-Down Development and a DSL-first approach to software architecture. It describes splitting an application into layers, with the presentation layer at the top interacting with users, an application layer in the middle coordinating tasks, a domain layer storing business logic, and an infrastructure layer handling lower-level functions. Tests start at the presentation layer and make the UI dynamic by adding mocked lower layers. A DSL-first approach treats the DSL implementation as the system and code in the DSL as system rules, allowing great abstraction and splitting concerns. An example refactors a system using this approach.
This document discusses a presentation on SOLID software design principles. The agenda includes discussing goals of code quality, an introduction to SOLID principles, other design principles, a demo, and concluding thoughts. SOLID is an acronym that stands for five principles: Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle. The presentation aims to provide hooks to help attendees gradually improve their coding skills through understanding and applying these fundamental software design concepts.
Professional practises craftsmanship trainings - part 2Jacob Chencha
This document discusses techniques for managing complexity at different levels of software development. It covers managing complexity at the package level through techniques like microservices and hexagonal architecture. At the class level it discusses principles like SOLID and design patterns. At the function level it discusses techniques like limiting arguments, avoiding side effects, and having a single entry and exit point. The goal is to break down applications into independent and cohesive components to reduce complexity through abstraction and separation of concerns.
This document provides an overview of software engineering concepts covered in lecture notes. It discusses the software development life cycle (SDLC) which includes key stages like requirements gathering, design, coding, testing, integration and maintenance. The SDLC framework aims to develop software efficiently using a well-defined process. Software engineering principles like abstraction and decomposition are used to reduce complexity when developing large programs.
- Many software projects fail to be completed on time and on budget due to unrealistic deadlines, poor estimation of tasks, and changing requirements. Architectural flaws and lack of domain knowledge also contribute to project failures.
- Common problems include inadequate testing, poor code quality, lack of documentation, and developers not wanting to work on code they did not write themselves. Traditional software engineering practices have not changed much over the past 30 years.
- A better approach focuses on rapid feedback through small iterative releases, collaboration with customers, responding flexibly to change, and empowering self-organizing teams. Continuous integration and testing also help catch problems early.
This document discusses 7 challenges of using Redux including: 1) Async programming and cancelling promises, 2) Preventing DOM mutations from libraries, 3) Working with the URL bar in single page applications, 4) Piggybacking on componentDidMount to generate data, 5) Using imperative programming patterns rather than functional patterns, 6) Mental overhead of action creators and reducers, and 7) Determining if reactive streams from Redux Saga are needed. The author provides recommendations for addressing each challenge through further research and adopting functional programming principles.
ABSE and AtomWeaver : A Quantum Leap in Software DevelopmentRui Curado
ABSE is a Model-Driven Software Development methodology that lets you generate the code you want. Capture your own developments skills into easy reusable assets. AtomWeaver is an IDE that implements ABSE, allowing you to save time and be more productive while developing your software project.
This document discusses React.js and its use for frontend development. It covers the key features and advantages of React, how it works, its architecture including components and the virtual DOM, comparisons to other frameworks like Angular, and examples of companies that use React like Facebook and Netflix. The summary is:
React.js is a popular library for building user interfaces that uses reusable components and a virtual DOM for improved performance. It has advantages over frameworks like Angular in being easier to learn and use due to its simpler architecture and unidirectional data flow. Major companies like Facebook use React for significant parts of their applications, demonstrating its widespread adoption.
SE2_Lec 19_Design Principles and Design PatternsAmr E. Mohamed
The document discusses software design patterns and principles. It defines what design patterns are, their benefits, and some commonly used patterns like Singleton, Observer, and Strategy. It also covers software design principles like the Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, and others. The document provides examples to illustrate how patterns and principles can be applied to improve software design.
HTMX: Web 1.0 with the benefits of Web 2.0 without the grift of Web 3.0Martijn Dashorst
- HTMX is a JavaScript library that allows any HTML element to interact as a hypermedia component by adding attributes that instruct HTMX on what requests to make and how to update the DOM.
- Attributes like hx-get, hx-post, hx-target, and hx-swap allow elements to make requests and update other elements without JavaScript. Inherited attributes remove repetition.
- HTMX requests can be detected on the server via request headers, and response headers can modify requests by changing targets or swapping mechanisms. Classes provide feedback during requests.
While our predecessor product(s) were a COBOL application and later a Windows client/server application distributed on floppies, since 2005 we rock a Java web application that has gone through a lot of changes to keep up with the times. No longer duplicating 5 1/4” 1.2M floppies over the weekend and mailing them to our customers, but a single `git push` will deliver our latest version to our customers.
In this session you will learn how we made our application survive for 18 years and still be relevant. Learn how we rearchitected our application from 2005 to 2022, and more importantly, what we did wrong so you can avoid our mistakes. We migrated from Java 1.4 to Java 17, we moved from tomcat+hibernate+velocity via tomcat+hibernate+wicket+cxf+axis+spring+jgroups+ehcache to wildfly+wicket, from deploying on physical hardware to virtual kubernetes nodes. From manually scp-ing releases to gitops, and from Oracle to Postgresql, causing a 5 week outage.
If you learn only one thing from Martijn Dashorst’s session: always have a plan B.
A great idea can be built with almost any technology. The success or failure of your project has more to do with vision, leadership, execution, and market than technological choices.
Besides the vision, a lot of startups focus on culture. what isn’t often mentioned is that the technical decisions will have a direct effect on the company culture. Great things have been built with each of the technologies. But they do come with a culture.
The purpose of this presentation is to help developers, managers, founders, etc. to make an insightful decision about the framework they want to use to create their product.
SOLID is a popular set of five design principles for object-oriented software development. The principles are: Single Responsibility Principle, which states that a class should have one responsibility; Open/Closed Principle, which states that code should be open for extension but closed for modification; Liskov Substitution Principle, which states that subclasses should not break the functionality of parent classes; Interface Segregation Principle, which states that clients should not depend on interfaces they do not use; and Dependency Inversion Principle, which states that high-level modules should not depend on low-level modules and abstractions should not depend on details.
This document provides an overview and introduction to domain-driven design (DDD). It discusses the core principles of DDD, including focusing on modeling the domain, capturing domain knowledge in software models, and structuring software around domain concepts. The document also summarizes some common DDD patterns and techniques for managing complexity, such as ubiquitous language, layered architecture, aggregates, entities, value objects, services, factories, and repositories. The overall goal of DDD is to build software that is closely aligned with the conceptual model of the problem domain.
Secrets of going codeless - How to build enterprise apps without codingNewton Day Uploads
The document discusses methods for building enterprise applications without coding, known as codeless development or CAAD (Computer Aided Applications Development). It describes how CAAD uses pre-built components and templates to create applications through a point-and-click interface, removing the need for extensive programming. The methodology involves four phases - plan, develop, release, and review. Key aspects of the CAAD process include defining the application purpose and requirements, prototyping the design, user testing iterations, and ongoing maintenance after release. Site constructs provide predefined user interface elements to help bridge communication gaps between technical and non-technical users.
This document discusses micro frontends, which divide large web applications into independent, standalone units. It outlines the issues with traditional monolithic applications, such as increased complexity and difficulty scaling. Micro frontends address these issues by allowing independent teams to work on separate application pieces with different technologies. The document covers micro frontend design considerations, communication patterns between units, and technical implementations using Angular Elements and the Frint framework.
The most experienced and learned developers always suggest hiring an electron application development company when it comes to building applications for desktops. Why do they prefer Electron.js? What’s so special about it? This topic will attempt to shed some light on the answers to these questions.
1) The document discusses the Dependency Inversion Principle, which states that high-level modules should not depend on low-level modules, but that both should depend on abstractions. This reduces rigidity, fragility, and increases reusability of a design.
2) It provides an example of a "Copy" program that copies characters from a keyboard to a printer. The original design couples the high-level "Copy" module to the low-level input and output modules, making it inflexible.
3) Applying the Dependency Inversion Principle, the design is improved by making the "Copy" module depend on abstract "Reader" and "Writer" interfaces instead of specific implementations,
This course provides a detailed introduction to the Object Oriented techniques identified by Robert Martin as the SOLID principles of software design. Intended for both novice and intermediary developers, each of the five principles are fully defined and explored. Real-world coding examples are provided for each software tenant to help fully expound upon the design techniques. By the end of the session, developers will be able to identify common code smells while applying SOLID programming practices that ensure clean and maintainable code.
In this core java training session, you will learn Elements of Java programming. Topics covered in this session are:
• Quick review of some important concepts from last class
• History of Java
• JDK and JRE
• Byte Code and JVM (Java Virtual Machine)
• Platform Independence
• Principles of Object Oriented Programming
• Writing your first Java Application
• Elements of Java programming language
• Built in Data Types
• Conditional Statements
• Loops
For more information about this course visit on this link: https://www.mindsmapped.com/courses/software-development/learn-java-fundamentals-hands-on-training-on-core-java-concepts/
Software Architecture Erosion and Modernizationbmerkle
The document discusses software architecture erosion and strategies to address it. It begins by defining software architecture and architectural erosion. It then examines examples of architectural erosion in open source projects like FindBugs and Eclipse. The document advocates modeling software architecture and subsystems to detect violations. It also presents tools and approaches for architectural analysis to monitor changes and deviations over time. Finally, it discusses best practices for open source projects and Eclipse to limit architectural erosion through community involvement and defined processes.
"Up-Down Development & DSL-first approach", Владимир Мельник, DataArtDataArt
The document discusses Up-Down Development and a DSL-first approach to software architecture. It describes splitting an application into layers, with the presentation layer at the top interacting with users, an application layer in the middle coordinating tasks, a domain layer storing business logic, and an infrastructure layer handling lower-level functions. Tests start at the presentation layer and make the UI dynamic by adding mocked lower layers. A DSL-first approach treats the DSL implementation as the system and code in the DSL as system rules, allowing great abstraction and splitting concerns. An example refactors a system using this approach.
This document discusses a presentation on SOLID software design principles. The agenda includes discussing goals of code quality, an introduction to SOLID principles, other design principles, a demo, and concluding thoughts. SOLID is an acronym that stands for five principles: Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle. The presentation aims to provide hooks to help attendees gradually improve their coding skills through understanding and applying these fundamental software design concepts.
Professional practises craftsmanship trainings - part 2Jacob Chencha
This document discusses techniques for managing complexity at different levels of software development. It covers managing complexity at the package level through techniques like microservices and hexagonal architecture. At the class level it discusses principles like SOLID and design patterns. At the function level it discusses techniques like limiting arguments, avoiding side effects, and having a single entry and exit point. The goal is to break down applications into independent and cohesive components to reduce complexity through abstraction and separation of concerns.
This document provides an overview of software engineering concepts covered in lecture notes. It discusses the software development life cycle (SDLC) which includes key stages like requirements gathering, design, coding, testing, integration and maintenance. The SDLC framework aims to develop software efficiently using a well-defined process. Software engineering principles like abstraction and decomposition are used to reduce complexity when developing large programs.
- Many software projects fail to be completed on time and on budget due to unrealistic deadlines, poor estimation of tasks, and changing requirements. Architectural flaws and lack of domain knowledge also contribute to project failures.
- Common problems include inadequate testing, poor code quality, lack of documentation, and developers not wanting to work on code they did not write themselves. Traditional software engineering practices have not changed much over the past 30 years.
- A better approach focuses on rapid feedback through small iterative releases, collaboration with customers, responding flexibly to change, and empowering self-organizing teams. Continuous integration and testing also help catch problems early.
This document discusses 7 challenges of using Redux including: 1) Async programming and cancelling promises, 2) Preventing DOM mutations from libraries, 3) Working with the URL bar in single page applications, 4) Piggybacking on componentDidMount to generate data, 5) Using imperative programming patterns rather than functional patterns, 6) Mental overhead of action creators and reducers, and 7) Determining if reactive streams from Redux Saga are needed. The author provides recommendations for addressing each challenge through further research and adopting functional programming principles.
ABSE and AtomWeaver : A Quantum Leap in Software DevelopmentRui Curado
ABSE is a Model-Driven Software Development methodology that lets you generate the code you want. Capture your own developments skills into easy reusable assets. AtomWeaver is an IDE that implements ABSE, allowing you to save time and be more productive while developing your software project.
This document discusses React.js and its use for frontend development. It covers the key features and advantages of React, how it works, its architecture including components and the virtual DOM, comparisons to other frameworks like Angular, and examples of companies that use React like Facebook and Netflix. The summary is:
React.js is a popular library for building user interfaces that uses reusable components and a virtual DOM for improved performance. It has advantages over frameworks like Angular in being easier to learn and use due to its simpler architecture and unidirectional data flow. Major companies like Facebook use React for significant parts of their applications, demonstrating its widespread adoption.
SE2_Lec 19_Design Principles and Design PatternsAmr E. Mohamed
The document discusses software design patterns and principles. It defines what design patterns are, their benefits, and some commonly used patterns like Singleton, Observer, and Strategy. It also covers software design principles like the Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, and others. The document provides examples to illustrate how patterns and principles can be applied to improve software design.
HTMX: Web 1.0 with the benefits of Web 2.0 without the grift of Web 3.0Martijn Dashorst
- HTMX is a JavaScript library that allows any HTML element to interact as a hypermedia component by adding attributes that instruct HTMX on what requests to make and how to update the DOM.
- Attributes like hx-get, hx-post, hx-target, and hx-swap allow elements to make requests and update other elements without JavaScript. Inherited attributes remove repetition.
- HTMX requests can be detected on the server via request headers, and response headers can modify requests by changing targets or swapping mechanisms. Classes provide feedback during requests.
While our predecessor product(s) were a COBOL application and later a Windows client/server application distributed on floppies, since 2005 we rock a Java web application that has gone through a lot of changes to keep up with the times. No longer duplicating 5 1/4” 1.2M floppies over the weekend and mailing them to our customers, but a single `git push` will deliver our latest version to our customers.
In this session you will learn how we made our application survive for 18 years and still be relevant. Learn how we rearchitected our application from 2005 to 2022, and more importantly, what we did wrong so you can avoid our mistakes. We migrated from Java 1.4 to Java 17, we moved from tomcat+hibernate+velocity via tomcat+hibernate+wicket+cxf+axis+spring+jgroups+ehcache to wildfly+wicket, from deploying on physical hardware to virtual kubernetes nodes. From manually scp-ing releases to gitops, and from Oracle to Postgresql, causing a 5 week outage.
If you learn only one thing from Martijn Dashorst’s session: always have a plan B.
Converting 85% of Dutch Primary Schools from Oracle to PostgreSQLMartijn Dashorst
This case study describes migrating the most used application for primary schools in the Netherlands from Oracle to PostgreSQL. The application uses a multi-tenant, single schema database (i.e. 6000 schools in a single database) and runs using a typical Java EE frontend.
You will learn about our application architecture, hardware platform, reasons for switching, migration strategies considered and the results of our migration.
Since the CFP closes one week before our actual migration we can't reveal the results in this abstract, but the presentation will capture all the things that went wrong and well
The document discusses solutions for when documentation avoidance fails. It recommends using plain text formats like Markdown or AsciiDoc to write documentation, keeping documentation and code together, integrating documentation into development processes using tools like Git, Maven and Docker, and automating documentation testing and generation as much as possible. The document provides examples of using Arquillian, Maven, AShot and Graphene to automate the creation of a user manual with screenshots from automated tests. The goal is to produce an up-to-date user manual with high test coverage through continuous integration of documentation with code.
The Apache Wicket community is working hard to build the new major release of Wicket. One of the tentpole features is the move to Java 8 as a minimum requirement. Why did we do that, and how does this improve my Wicket code? Learn how to apply Java 8 features such as lambdas and the new DateTime API in your Wicket applications, and learn what else the community is creating for your benefit.
The document proposes a "Code Review Drinking Game" where certain common code review occurrences trigger sips of a drink, such as using "Random" instead of "secureRandom", TODO comments, or merge conflicts in committed code. It includes drinking game rules for both Java and JavaScript code reviews. The goal is to have an entertaining way to conduct code reviews by turning typical issues into opportunities to drink.
Java Serialization is often considered a dark art of Java programmers. This session will lift the veil and show what serialization is and isn't, how you can use it for profit and evil. After this session no NotSerializableException will be unconquerable.
How can you make code reviews more palatable? This drinking game will make any code review interesting and enjoyable. For Java/.Net programmers, and a special drinking game for JavaScript code reviews.
Na jaren projecten te duur en te laat opgeleverd te hebben met de waterval projectmethodiek heeft de IT industrie een nieuwe projectaanpak omarmt als de zilveren kogel die te late en te dure projecten achter zich zou laten. Door in korte iteraties op je doel af te gaan, waarbij het doel ook nog eens mag bewegen beloven deze nieuwe projectaanpakken als Scrum gouden bergen. Maakt deze beweging de belofte waar en is deze aanpak een goede match voor het (project)onderwijs?
In deze sessie legt Martijn Dashorst kort de moderne projectaanpakken uit, Scrum in het bijzonder, en hoe deze binnen Topicus toegepast worden om van koffie software te maken. Tot slot kijkt Martijn vanuit de onderwijspraktijk naar hoe goed Scrum matcht binnen het Hoger Onderwijs om zo de geschikheid van deze aanpak voor projectgroepen te analyseren.
Who Automates the Automators? (Quis Automatiet Ipsos Automates?)Martijn Dashorst
Who automates the automators? For a lot of people the future seems uncertain: automation may eat their jobs. Old and new industries are ripe for disruption: transportation, healthcare, education, finance, law and even the culinary industry are being automated as we speak. When chauffeurs and truck drivers fear that they won't be able to hitch a ride into the future, should the automators perhaps wonder... when is it our turn to be automated? Who automates the automators?
Martijn Dashorst takes a look at the future of the programmer: are we also without a job when the last doctor, lawyer, 3-star chef and driver have been automated?
Het oorspronkelijke verhaal van de Schone Coder geschreven door de gebroeders Scrum over hoe Assertpoetser in een vervloekt project terecht kwam dat het rijk in 100 jaar technical debt stortte. Kan Prinses Agile hem op tijd redden? Sprintten ze nog lang en gelukkig?
In deze lunchlezing vertelt Martijn Dashorst over het wel en wee van de coder die in een wereld vol tegenstrijdige belangen probeert te overleven en zinvol werk te leveren. Hoe krijg je een goede hygiene voor jou, je omgeving en je code? Hoe voorkom je 10 jaar lange technical debt? Met meer dan 20 jaar ontwikkelervaring biedt Martijn een blik in de keuken van een professionele software ontwikkelaar.
With the Tenth Anniversary of Wicket behind us, Wicket is still one of the thriving survivors of the Great Web Framework Wars of the mid 00's. Is there a future for server-side frameworks? In this presentation Martijn Dashorst provides a brief history of Wicket.
With a State of the Wicket, Martijn will look at who is currently using Wicket, the community and current release plans.
The majority of this session will be dedicated to the future of Wicket: does a component oriented, Java web framework have a future in the era of native clients and client side JavaScript frameworks? Martijn will layout the plans of making Wicket more productive for current users, on integrating better with JavaEE technologies and much more.
This document provides an overview of Apache Wicket, a Java web application framework. It begins with an introduction to Wicket and its core concepts like components. It then walks through an example of creating a simple cheese store application with Wicket, including setting up the project, adding domain models and entities, and building out components. The document also discusses how to use Enterprise JavaBeans (EJBs) with Wicket, such as making data access objects (DAOs) into EJBs and injecting them.
This document provides an overview of the state of the Apache Wicket framework. It discusses Wicket's origins and history from 2004 to present, including major releases and contributions over time. It also summarizes key metrics about Wicket's codebase and community based on an Ohloh report, including lines of code, contributors, and estimated development effort. Finally, it previews possible future directions for Wicket in areas like Java 8 support, JavaScript integration, and semantic versioning.
Presentation about Apache Wicket given at FOSDEM 2011. Apache Wicket is an open source, component oriented Java web framework. This presentation features an introduction to the Wicket framework and showcases some of the new features in the upcoming 1.5 release of Wicket.
A Dutch presentation (with English quotes) about the ongoing renaissance in software engineering where we transition from begin regarded as mere drones to software craftsmen. This presentation is heavily influenced by Robert C. Martin's The Renaissance of Craftsmanship.
The document provides 6 ways to keep work from interfering with weekends by testing and monitoring Wicket applications. It recommends using WicketTester for component and Ajax testing without starting the server. It also suggests using PageChecker to validate pages against a policy file, EntityChecker to detect non-serializable objects attached to pages, MarkupValidator to ensure valid HTML, RequestLogger for decoded request information, and monitoring tools like Nagios for uptime and performance of production applications.
Wicket in Action is the introduction I gave at the Øredev conference in Malmö, Sweden in November 2008. You'll learn about Wicket, Components, Models, Integrating Spring, Testing, and deploying your Wicket application.
Unfortunately slideshare doesn't work with accented letters in the URL, so I had to change the title.
The document provides guidance for successfully graduating a project from the Apache Software Foundation (ASF) Incubator within a year. It outlines that the ASF is a US nonprofit organization with around 2000 committers and 250 members supporting 60 open source projects through a collaborative development process. Participants who want to join an existing community or grow their own are advised to consider entering the ASF Incubator.
Presentation on Apache Wicket delivered at JavaPolis 2007 in Antwerp. We introduce Wicket, learn the concepts and go through developing an online Cheese store
WhatsApp offers simple, reliable, and private messaging and calling services for free worldwide. With end-to-end encryption, your personal messages and calls are secure, ensuring only you and the recipient can access them. Enjoy voice and video calls to stay connected with loved ones or colleagues. Express yourself using stickers, GIFs, or by sharing moments on Status. WhatsApp Business enables global customer outreach, facilitating sales growth and relationship building through showcasing products and services. Stay connected effortlessly with group chats for planning outings with friends or staying updated on family conversations.
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Neo4j - Product Vision and Knowledge Graphs - GraphSummit ParisNeo4j
Dr. Jesús Barrasa, Head of Solutions Architecture for EMEA, Neo4j
Découvrez les dernières innovations de Neo4j, et notamment les dernières intégrations cloud et les améliorations produits qui font de Neo4j un choix essentiel pour les développeurs qui créent des applications avec des données interconnectées et de l’IA générative.
OpenMetadata Community Meeting - 5th June 2024OpenMetadata
The OpenMetadata Community Meeting was held on June 5th, 2024. In this meeting, we discussed about the data quality capabilities that are integrated with the Incident Manager, providing a complete solution to handle your data observability needs. Watch the end-to-end demo of the data quality features.
* How to run your own data quality framework
* What is the performance impact of running data quality frameworks
* How to run the test cases in your own ETL pipelines
* How the Incident Manager is integrated
* Get notified with alerts when test cases fail
Watch the meeting recording here - https://www.youtube.com/watch?v=UbNOje0kf6E
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
E-commerce Development Services- Hornet DynamicsHornet Dynamics
For any business hoping to succeed in the digital age, having a strong online presence is crucial. We offer Ecommerce Development Services that are customized according to your business requirements and client preferences, enabling you to create a dynamic, safe, and user-friendly online store.
SOCRadar's Aviation Industry Q1 Incident Report is out now!
The aviation industry has always been a prime target for cybercriminals due to its critical infrastructure and high stakes. In the first quarter of 2024, the sector faced an alarming surge in cybersecurity threats, revealing its vulnerabilities and the relentless sophistication of cyber attackers.
SOCRadar’s Aviation Industry, Quarterly Incident Report, provides an in-depth analysis of these threats, detected and examined through our extensive monitoring of hacker forums, Telegram channels, and dark web platforms.
Flutter is a popular open source, cross-platform framework developed by Google. In this webinar we'll explore Flutter and its architecture, delve into the Flutter Embedder and Flutter’s Dart language, discover how to leverage Flutter for embedded device development, learn about Automotive Grade Linux (AGL) and its consortium and understand the rationale behind AGL's choice of Flutter for next-gen IVI systems. Don’t miss this opportunity to discover whether Flutter is right for your project.
Neo4j - Product Vision and Knowledge Graphs - GraphSummit ParisNeo4j
Dr. Jesús Barrasa, Head of Solutions Architecture for EMEA, Neo4j
Découvrez les dernières innovations de Neo4j, et notamment les dernières intégrations cloud et les améliorations produits qui font de Neo4j un choix essentiel pour les développeurs qui créent des applications avec des données interconnectées et de l’IA générative.
E-commerce Application Development Company.pdfHornet Dynamics
Your business can reach new heights with our assistance as we design solutions that are specifically appropriate for your goals and vision. Our eCommerce application solutions can digitally coordinate all retail operations processes to meet the demands of the marketplace while maintaining business continuity.
May Marketo Masterclass, London MUG May 22 2024.pdfAdele Miller
Can't make Adobe Summit in Vegas? No sweat because the EMEA Marketo Engage Champions are coming to London to share their Summit sessions, insights and more!
This is a MUG with a twist you don't want to miss.
6. SOLID
Robert C. Martin Copyright (c) 2000 by Robert C. Martin. All Rights Reserved.
www.objectmentor.com
1
Design Principles and
Design Patterns
Robert C. Martinwww.objectmentor.com
What is software architecture? The answer is multitiered. At the highest level, there
are the architecture patterns that define the overall shape and structure of software
applications1
. Down a level is the architecture that is specifically related to the pur-
pose of the software application. Yet another level down resides the architecture of
the modules and their interconnections. This is the domain of design patterns2
, pack-
akges, components, and classes. It is this level that we will concern ourselves with in
this chapter.
Our scope in this chapter is quite limitted. There is much more to be said about the
principles and patterns that are exposed here. Interested readers are referred to
[Martin99].
Architecture and DependenciesWhat goes wrong with software? The design of many software applications begins as
a vital image in the minds of its designers. At this stage it is clean, elegant, and com-
pelling. It has a simple beauty that makes the designers and implementers itch to see it
working. Some of these applications manage to maintain this purity of design through
the initial development and into the first release.But then something begins to happen. The software starts to rot. At first it isn’t so
bad. An ugly wart here, a clumsy hack there, but the beauty of the design still shows
through. Yet, over time as the rotting continues, the ugly festering sores and boils
accumulate until they dominate the design of the application. The program becomes a
festering mass of code that the developers find increasingly hard to maintain. Eventu-1. [Shaw96]
2. [GOF96]
10. A class should only have a single
responsibility, that is, only changes to one
part of the software's specification should
be able to affect the specification of the
class.
wikipedia.org
36. ...in a computer program, if S is a
subtype of T, then objects of type T
may be replaced with objects of
type S without altering any of the
desirable properties of the program
(correctness, task performed, etc.)
wikipedia.org
Liskov substitution principle
59. 1. High-level modules should not depend
on low-level modules. Both should
depend on abstractions.
2. Abstractions should not depend on
details. Details should depend on
abstractions.
1. High-level modules should not depend
on low-level modules. Both should
depend on abstractions.
2. Abstractions should not depend on
details. Details should depend on
abstractions.
71. Meer lezen/zien?
• GRASP
(wikipedia)
• Refactoring (2nd Edition)
Martin Fowler (boek)
• Clean Code
Robert C. Martin (boek)
• Readable code - and the long
lost secret of how to achieve it
Christin Gorman (video, 10min)