Commanded: Harness the Power of Event-Driven Architecture
In this digital era, where organizations face complex challenges, the need for robust, flexible, and scalable architecture is more substantial than ever. In search of an elegant solution to this problem, Elixir-driven open-source project, Commanded, has surfaced as a game-changer. Commanded is specifically designed to help build applications following the Command Query Responsibility Segregation and event sourcing pattern.
Project Overview:
Commanded, hosted on GitHub, is an open-source project that aims to provide a robust framework for creating Elixir applications. By endorsing Domain-Driven Design, CQRS, and event sourcing, Commanded addresses the increasing need for scalable, responsive, and resilient applications. Its users mainly comprise software developers and application architects seeking a comprehensive toolset to facilitate the building and handling of event-driven applications.
Project Features:
Commanded provides an array of features that aid developers in constructing applications. Among its numerous functionalities, it enables process managers, a high-level policy-making module that listens and reacts to specific events. Additionally, Commanded promotes strong consistency, ensuring data integrity by maintaining order in executing commands. The library also includes a time-travel feature for an event store, allowing for retrospective changes to events and their effects.
Commanded’s swappable event storage with Postgres and EventStore adaptability, together with the extensible middleware comprising dispatch, execution, handling, and validation, make operations all the smoother.
Technology Stack:
Commanded implements Elixir, an Erlang-based functional programming language known for its scalability and maintainability. It often aligns with platforms that demand high availability and low latency, elevating Commanded’s applicability. The project employs Commanded EventStore Adapter, a library that provides event store handling for Commanded apps, promoting a convenient and consistent user experience.
Project Structure and Architecture:
Commanded uses an event-driven, reactive architecture documenting actions as a sequence of events. The framework consists of multiple Commanded applications, each acquiring a separate event bus, decorated with routers, event handlers, and process managers to complete the system's functionality. This arrangement is efficient in enhancing application scalability, maintaining strong consistency, and augmenting business data visibility.
Contribution Guidelines:
Being an open-source project, Commanded encourages contributors to strengthen and improve the tools. They provide clear submission guidelines for bug reports, feature requests, and code contributions, helping maintain the high quality of the project. Besides, they place significant emphasis on maintaining consistent and full documentation, ensuring the smooth integration of additions to the system.
