Wilford  Pagac

Wilford Pagac

1599944400

DDD-Domain Driven Design or Deadline Driven Design?

When I asked my clients who know Domain-Driven Design, less than 10% would nod their heads.

However, when I asked who experienced Deadline Driven Design, almost all would laugh and feel connected.

Put the Cart Before the Horse

Let me share an experience once I delivered DDD methodology to a customer.

BA(Business Analysis) Mr. T is the one I coached for adopting event storming and DDD methodology to analyze the requirement and do the design afterward in Lab1. After a short break, we met again for a second project Lab2.“

We were standing in front of the following map which was completed by BA Mr. T. He looked quite puzzled with what he did.

#devops #user stories #ddd #domain driven design #deadline

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DDD-Domain Driven Design or Deadline Driven Design?
Wilford  Pagac

Wilford Pagac

1599944400

DDD-Domain Driven Design or Deadline Driven Design?

When I asked my clients who know Domain-Driven Design, less than 10% would nod their heads.

However, when I asked who experienced Deadline Driven Design, almost all would laugh and feel connected.

Put the Cart Before the Horse

Let me share an experience once I delivered DDD methodology to a customer.

BA(Business Analysis) Mr. T is the one I coached for adopting event storming and DDD methodology to analyze the requirement and do the design afterward in Lab1. After a short break, we met again for a second project Lab2.“

We were standing in front of the following map which was completed by BA Mr. T. He looked quite puzzled with what he did.

#devops #user stories #ddd #domain driven design #deadline

Giles  Goodwin

Giles Goodwin

1600814820

The Concept of Domain-Driven Design Explained

Using microservices means creating applications from loosely coupling services. The application consists of several small services, each representing a separate business goal. They can be developed and easily maintained individually, after what they are joint in a complex application.

Microservices is an architecture design model with a specific bounded context, configuration, and dependencies. These result from the architectural principles of the domain-driven design and DevOps. Domain-driven design is the idea of solving problems of the organization through code.

The business goal is important to the business users, with a clear interface and functions. This way, the microservice can run independently from other microservices. Moreover, the team can also work on it independently, which is, in fact, the point of the microservice architecture.

Many developers claim microservices have made them more efficient. This is due to the ability to work in small teams. This allows them to develop different small parts that will later be merged as a large app.

They spend less time coordinating with other developers and more time on developing the actual code. Eventually, this creates more value for the end-user.

The Complexity Challenge

Complexity is a relative term. What’s complex for one person is simple for another. However, complexity is the problem that domain-driven design should solve. In this context, complexity means interconnectedness, many different data sources, different business goals, etc.

The domain-driven approach is here to solve the complexity of software development. On the other hand, you can use emergent design when the challenge is simple. However, when your application is complex, the complexity will only grow, and so will your problems.

Domain-driven design bases on the business domain. Modern business environments are very complex and wrong moves can lead to fatal outcomes. Domain-driven design solves complex domain models, connecting to the core business concepts.

Eric Evans, introduced the concept in 2004, in his book Domain-Driven Design: Tackling Complexity in the Heart of Software. According to the book, it focuses on three principles:

  • The primary focus of the project is the core domain and domain logic.
  • Complex designs are based on models of the domain.
  • Collaboration between technical and domain experts is crucial to creating an application model that will solve particular domain problems.

Important Terms in Domain-Driven Design

In DDD, it’s important to pay attention to the following terms:

Domain logic

Domain logic is the purpose of your modeling. Most commonly, it’s referred to as the business logic. This is where your business rules define the way data gets created, stored, and modified.

Domain model

Domain model includes the ideas, knowledge, data, metrics, and goals that revolve around that problem you’re trying to solve. It contains all the rules and patterns that will help you deal with complex business logic. Moreover, they will be useful to meet the requirements of your business.

Subdomain

A domain consists of several subdomains that refer to different parts of the business logic. For example, an online retail store could have a product catalog, inventory, and delivery as its subdomains.

Design patterns

Design patternsare all about reusing code. No matter the complexity of the problem you encounter, someone who’s been doing object-oriented programming has probably already created a pattern that will help you solve it. Breaking down your problem into its initial elements will lead you to its solution. Everything you learn through patterns, you can later use for any object-oriented language you start to program in.

#devops #microservices #domain driven design #microservices adoption #microservices archiecture #domain driven design introduction

Landscapes Website Design | Nature Landscapes Website Designer

Most landscapers think of their website as an online brochure. In reality of consumers have admitted to judging a company’s credibility based on their web design, making your website a virtual sales rep capable of generating massive amounts of leads and sales. If your website isn’t actively increasing leads and new landscaping contracts, it may be time for a redesign.

DataIT Solutions specializes in landscape website designing that are not only beautiful but also rank well in search engine results and convert your visitors into customers. We’ve specialized in the landscaping industry for over 10 years, and we look at your business from an owner’s perspective.

Why use our Landscapes for your landscape design?

  • Superior experience
  • Friendly personal service
  • Choice of design layout
  • Budget sensitive designs
  • Impartial product choice and advice
  • Planting and lighting designs

Want to talk about your website?
If you are a gardener or have a gardening company please do not hesitate to contact us for a quote.
Need help with your website?
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#nature landscapes website design #landscapes website design #website design #website designing #website designer #designer

Reactive Architecture – Domain-Driven Design (DDD)

This blog explains techniques and building blocks of Domain-Driven Design which can be used to design a Reactive System.

Domain-Driven Design is an architectural approach that focuses on creating software that solves large and complex problems. The “who can solve this?” and that “what process will they follow?” aspects are addressed later.

Domain-Driven Design gets to the core problem earlier in the design and helps you structure your solution (i.e. identifying Entities, Value Objects, Repositories, Domain/Application/Infrastructure services, Bounded Contexts, Specifications, etc)

Goals

  • Design an evolving model by placing the primary focus on the domain and domain logic. The subject area to which the user applies a program is the domain of the software.
  • One of the key goals of DDD is to create a software implementation based on an evolving model that is easily understood by the domain experts. So DDD provides an effective communication channel between domain experts and software developers.
  • To break a large complex system into smaller pieces or subdomains. Building a large complex system in one coherent model can be difficult.

Guidelines of DDD are more compatible with the Reactive Architecture. For example, breaking a large system into sub-domains or smaller pieces helps us to determine boundaries. Reactive Microservices have a similar goal that they need to be separated along clear boundaries. Each microservice has to have a clearly defined API and a specific set of responsibilities. It would be difficult to design and build a microservice if we don’t know it’s responsibilities. DDD provides a set of guidelines and techniques to break larger domains into smaller domains and define clear boundaries. Reactive framework Lagom is built based on DDD. However, DDD and Reactive Architecture can exist independently.

What is Domain?

A Domain is a sphere of knowledge, influence, or activity. In the context of software, it refers to be the business or idea that we are modeling. People who understand the domain are domain experts.

If you are building a retailing software, so your domain will be Retail and the Sales associate, Cashier, Customer Service Representative, Store Manager, Inventory Manager, Buyer, etc will be domain experts. And these people may or may not have expertized in software.

The purpose of DDD is to build a model that the domain experts understand. Here model represents the understanding of the domain which can be implemented as a software system. A domain model can also be implemented as a diagram or a document. The software for a domain model should be implemented in such a way that it reflects the model.

domain

Ubiquitous Language

In DDD, communication between software developers and domain experts requires a common language and that is called Ubiquitous Language. Words in the Ubiquitous Language originates in the domain and comes from domain experts and those words used in the domain model and eventually in software. The introduction of software terms into the domain should be avoided. Whenever there is such a need to introduce a word, software developers and domain experts should have a conversation to find if there is any such word already exists in the domain.

For example, if we start using technical terms like databases, event bus, entity, etc our domain experts might get lost. They know words like order, payment, item, invoice, inventory, customer, etc. These are words that somebody who works in a retail store can understand.

Ubiquitous Language enables the communication between software developers and domain experts to have a conversation about the domain model and software system without using software terms.

#scala #domain driven design #reactive architecture #reactive systems #ddd

Juned Ghanchi

1621315250

Designing Mobile Apps using the latest UI Design Principles

The mobile technology world is growing at the speed of light, and the apps have become an integral part of our daily life. We can now see an influx of technology with tools that can help create mobile apps. All of them are becoming more accessible and hence people are getting on their first app making journeys. Since the mobile app industry is getting bigger and better than ever, businesses from all corners of the world are trying to develop mobile apps for their operations and marketing. Designing a mobile app for businesses is the first step, though. Company owners are in charge of the basic look and feel of the designed product. With a brilliant mobile app design, one can establish a relationship between app and user very well.

Read Blog Here: https://www.indianappdevelopers.com/blog/designing-mobile-apps-using-latest-ui-design-principles/

#designing mobile apps #ui design principles #mobile ui design #mobile app design #ui design #app design