Showing posts from 2021

Performance improvement for EventSourcing/CQRS with Snapshots

Introduction to Event Sourcing and CQRS The fundamental idea of Event Sourcing is ensuring that every change to the state of an application is captured in an event object, and that these event objects are themselves stored in the sequence they were applied for the same lifetime as the application state itself. (For more information about Event Sourcing I recommend this post written by Martin Fowler ). Based on my experience working with Event Sourcing, having the sequence of events allows you to perform awesome functionalities, like time travelling or replaying your events into multiple storage technologies. However, it can be tricky for some scenarios. To explain this better, I need to introduce Event Sourcing working together with Command Query Responsibility Segregation (CQRS). If you are not familiar with CQRS, the idea behind it is splitting commands (write operations) from queries (read operations), so they can work independently. (more info about CQRS in this post ). CQRS and Ev

Building Micro-Frontends with Single-Spa

Introduction Micro-services architecture is becoming trendy since it is a suitable option many projects, specially those that are complex and we want to be able spilt our business logic into different services that can be built and deliver independently. In spite of the fact that micro-services architectures are more complex, they increase the resilience of your system and increase the time-to-market delivery, which can be crucial for many companies. But it is not all about services and backend. With the introduction of single page applications (SPAs), we can build fully-functional user interfaces that can work independently in the browser. And here we should ask ourselves the same questions as for backend applications: Is my SPA becoming a huge monolith? Would I like to deliver functional modules independently? If you using micro-services, is there a relation between my services and your UI? Do we want to have functional teams that can deliver new features (frontend+backend) independe