Event Horizon is a CQRS/ES toolkit for Go.
CQRS stands for Command Query Responsibility Segregation and is a technique where object access (the Query part) and modification (the Command part) are separated from each other. This helps in designing complex data models where the actions can be totally independent from the data output.
ES stands for Event Sourcing and is a technique where all events that have happened in a system are recorded, and all future actions are based on the events instead of a single data model. The main benefit of adding Event Sourcing is tracability of changes which can be used for example in audit logging. Additionally, "incorrect" events that happened in the past (for example due to a bug) can be edited which will make the current data "correct", as that is based on the events.
Read more about CQRS/ES from one of the major authors/contributors on the subject: http://codebetter.com/gregyoung/2010/02/16/cqrs-task-based-uis-event-sourcing-agh/
Other material on CQRS/ES:
- http://martinfowler.com/bliki/CQRS.html
- http://cqrs.nu
- https://groups.google.com/forum/#!forum/dddcqrs
Inspired by the following libraries/examples:
- https://github.com/edumentab/cqrs-starter-kit
- https://github.com/pjvds/go-cqrs
- http://www.codeproject.com/Articles/555855/Introduction-to-CQRS
- https://github.com/qandidate-labs/broadway
Event Horizon is currently under heavy development and is not considered to be stable!
Suggestions are welcome!
See the example folder for a basic usage example to get you started.
Event Horizon is licensed under Apache License 2.0