Author: Peter

CQS & CQRS

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CQS means “Command-query separation”. It was introduced by Bertrand Meyer as part of his work on the Eiffel programming language. A method is either a command performing an action, or a query that returns data, but not both. Being purely action-performing methods, commands always have a void return type. Queries, on the other hand, should not have any observable side… Read more →

Software Development Principles & Patterns

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Who even gives a ****? I do. My Software Development Principles Unit Testing / Test Driven Development / Behaviour Driven Development CQRS Command and Query Responsibility Separation SOLID Single Responsibility Principle Open/Closed Principle Liskov’s Substitution Principle Interface Segregation Principle Dependency Inversion Principle AOP Aspect-Oriented Programming Unit Testing A unit as the smallest testable part of an application. In object-oriented programming, a… Read more →

My take on the Daily Stand-Up

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Details Meeting to last no longer than 15 minutes Schedule as early as possible each day to work for both on- and off- shore team members What we do Summarise what you’ve done since the last meeting. Summarise what you will you do before the next meeting. Summarise what is getting in your way or keeping you from doing your… Read more →

Updated Command & Query Handlers

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I’ve recently updated my definitions for Query Handlers. I’ve changed the original IQuery<Tresult> to IReturn<TResult> as, for me, it better reflects the intention of the [marker] interface. public interface ICommandHandler<TCommand> { void Execute(TCommand command); } public interface IReturn<TResult> { } public interface IQueryHandler<TQuery, TResult> where TQuery : IReturn<TResult> { TResult Execute(TQuery query); } Read more →