Implementing Domain-Driven Design

Event Serializers

It’s wise to choose a serializer that favors versioning and renaming Events. This is especially true early on in an A+ES project as the domain model tends to evolve rapidly. Consider this Event, which is declared using a .NET implementation of Protocol Buffers¹ annotations:

1. Protocol Buffers was originated by Google. Others have created .NET implementations.

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[DataContract] public class ProjectClosed {   [DataMember(Order=1)] public long ProjectId { get; set; }   [DataMember(Order=2)] public DateTime Closed { get; set; } }

Now, if we were to serialize ProjectClosed using DataContractSerializer or JsonSerializer rather than Protocol Buffers, any renamed members could easily break dependent consumers. ...