Warna's Journal

API design is essential for efficient communication between software systems. It plays a critical role in enabling developers to integrate different systems, components, or services effectively. Well-designed APIs simplify the process of accessing and utilizing the functionalities provided by software systems. APIs serve as reusable components, allowing developers to leverage existing functionality and save time and effort. Good API design ensures that APIs are intuitive, easy to understand, and consistent. They provide clear and concise documentation, making it easier for developers to work with and integrate the APIs into their own applications. APIs act as a contract between the provider and consumer of services. Good API design promotes collaboration between teams or organizations by defining clear expectations and interfaces for communication. APIs create opportunities for innovation and the creation of new applications. They empower developers to build upon existing systems and s...

Validation is a crucial aspect that must be addressed in your application. It is essential to ensure that each request is valid before proceeding with the processing. Another critical consideration is the approach to different types of validation. Input validation and business validation should be treated differently and require specific solutions. In this blog post, I will present an elegant solution for validation using MediatR and FluentValidation. Even if you are not using CQRS with MediatR, don't worry. The concepts and techniques I explain regarding validation can be easily adapted to other paradigms. Here's what I will cover in this week's newsletter: 1. Standard approach of validation  2. Input vs. business validation 3. Separating validation logic 4. Generic ValidationBehavior Now, let's dive in. The Standard Approach of Command Validation : Typically, validation is implemented just before processing the command. However, this tightly couples the validation wit...

Handling errors in code is a critical aspect of software development. There are different approaches to handling errors, but one effective method is using the Result pattern. Here's a step-by-step guide on how to handle errors using the Result pattern: 1. Identify the types of errors: Start by categorizing the errors into two groups - errors you know how to handle and errors you don't know how to handle. 2. Use exceptions for exceptional situations: Exceptions should be reserved for errors that are unexpected or exceptional. If you expect potential errors, it's better to make them explicit using the Result pattern. 3. Implement the Result class: Create a Result class that represents the outcome of an operation. The Result class should have properties like "IsSuccess" and "Error" to indicate whether the operation succeeded or failed and to provide details about the error, if applicable. 4. Create specific Error classes: Create an Error class that represen...