Software Design

How do you share data between services? This is one of the most common questions when you have a system composed of many different services, and each service owns a data set. For example, you may need data from another service for validation or to send data to another service as part of a workflow. I will explain a few situations where you could share data between services, but more importantly, when you shouldn’t. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Data Ownership A common… Read More »“I NEED data from another service!”… Do you really?

A common approach people take with testing is mocking. Specifically defining interfaces for dependencies which are then typically mocked so you can test in isolation. While interfaces can be helpful for mocking as well as fakes and stubs, there can be other approaches taken. Meaning you don’t need to create an interface for everything. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Deterministic Let’s start with a method in an OrderService for creating an Order. To test this method, there are a few dependencies involved. The… Read More »Testing WITHOUT Mocks or Interfaces!

One of the most challenging aspects of distributed applications like microservices is UI Composition. How to combine all the data from various services for your UI. I’m going over a few different solutions and their pros and cons for UI Composition and ViewModel Composition. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Multiple Sources When you’re working within a monolith and a single database, we don’t have the issue of compositing data. We get all the data we need from the single source database. As an… Read More »The Challenge of Microservices: UI Composition