Define rich, type‑safe domain model
Describe commands, events, and state of entities using Protobuf.
Generate the data types code for all tiers and runtimes
Add business logic in a straight and testable way
Focus on business logic rather than “plumbing”.
Command will be delivered to only one
Projections will get all
Events they need.
ProcessManagers will cover more complex scenarios. Storage,
message delivery, and other environment matters are isolated from the main code.
Easily deploy to Google Cloud or a custom environment
In-memory and JDBC-based storage implementations allow to implement and test the core logic quickly. Adopt your application to selected deployment environment(s) with a few lines of code.
The code is automatically generated for all the languages of
your project, as you update the model.
Forget about missed
With Protobuf support, a model can be extended preserving backward and future compatibility with client- and server nodes of your application.
Transforming a single-tenant application into
a multi-tenant one requires a few lines of code. You don't have to introduce
tenantId parameters for all the calls.
Add and remove fields while keeping binary compatibility with older code;
handle new opportunities with
oneof, natively provided by Protobuf.
Projections based on the whole event history of the system.
Constraints defined in a business model are automatically checked for commands, events, and entity states. Learn more.
Use freely in closed-source projects. You are also welcome to contribute to improving our framework.
All the data types are immutable, which makes it easy to cache and share. Mutations are performed only in response to incoming messages using clearly defined cycles.
Should you need
WorkEstimate value, you get it within seconds,
for multiple languages. You can also have binary storage format
and automatic JSON support.
With CQRS and Event-Driven Architecture you can separate development workflows. More experienced team members can concentrate on the core domain and the write-side tasks while the read–side and UI are created by the rest of the team.