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Architecture & Design Follow 608 Followers

Versioning of Events in Event Sourced Systems

by Jan Stenberg Follow 6 Followers on  Jul 17, 2017

A challenge with event sourced systems is that events put in the event store years ago must be readable today, even though the software has gone through numerous changes, Greg Young stated in his presentation at this year’s DDD eXchange conference. If a system can be taken down, versioning of events is relatively simple. The real challenge comes when a system can’t be taken down.

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The Basics of Event Sourcing and Some CQRS

by Jan Stenberg Follow 6 Followers on  Sep 30, 2014 1

State transitions are an important part of our problem space and should be modelled within our domain, Greg Young states in a recent presentation focusing on basic event sourcing and how CQRS fits in.

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Greg Young on Using Complex Event Processing

by Jan Stenberg Follow 6 Followers on  Jan 29, 2014 4

Complex Event Processing, CEP, can be very useful for problems that have to do with time e.g. querying over historical data when you want to correlate things that have happened at different times, Greg Young explained in a recent presentation.

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Event Store 2.0 Released with Security Support and the Projections Library in Beta

by Jan Stenberg Follow 6 Followers on  Jul 27, 2013

Version 2.0 of the Event Store, (an Event Source based persistence engine), was released last week with support for security, allowing for lock down of the Event Store and setting up Access Control Lists on event streams. The Projections library is now in beta and more documentation has been added.

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Greg Young on using Event Store as a Read Model

by Jan Stenberg Follow 6 Followers on  Jan 29, 2013

Greg Young, the lead architect behind the Event Store, recently talked about the Projections Library in the Event Store and how it can be used as a Read Model. In his presentation Greg explained what the Projections Library is, together with its main use cases. He also presented a number of examples of practical use.

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