A few weeks ago I came across this Mars Rover programming challenge/kata and being a bit of a space buff, I thought I will take a crack at it.
In this post I will share some of the TDD heuristics that I have found useful on when you should use mocking to verify interactions and when should you resort to state verification.
Many articles talk about the what of this style but in my view, not enough talk about the how. In this post, I am going to try and show one way to actually structure the solution to be more in line with the hexagonal ports and adapters style.
…the whole business process can be divided into smaller asynchronous sub-processes with each one feeding i.e. “piping” its output into the input of the subsequent process(es). At each stage some processing is done for e.g. data enriching, filtering etc and this processing generically is termed as a “filter”.
The way logging and instrumentation in code has traditionally been done is something like the below, say, I want to profile my application service method called “PeriodCloseReportAsync()” that gets called from my MVC controller action: This can be ok to a certain extent as long as the application is simple enough and you only intend […]
In a multi-tenant environment the application database is usually partitioned by tenants. This is done to achieve isolation and scalability. The problem of course is how do you route tenant requests to the correct databases?
In part 2, I talked about my domain modeling thought process so this post is about trying to persist those objects for long term storage. Although the avenue for different data storage provider is always open with the kind of design I will talk about here, my default data store tends to be SQL Server […]
In part 4, I detailed the way I went about creating application services for my expense tracking application. In this final post, I will talk about the ASP.NET Core MVC application that I built with HTML5/Razor front end views on top of the application services. Remember the application services consumption model sketch from the last […]
Application services can be loosely compared with the business logic layer of the yesteryear with one key difference, application services don’t actually contain any business logic neither they enforce any business logic.