Aggregate services
Data in a microservice architecture is owned by a single service, but there are many times when we might need to retrieve data from a number of different sources at once. Consider, again, a member of the Small Council in the land of Westeros. They may have a number of informants from whom they gather information about the workings of the kingdom. You can consider each informant to be its own microservice.
Tip
Informants are a fantastic metaphor for microservices as each one is independent and holds its own data. Services may also fail from time to time just as informants may be captured and terminated. Messages are passed between informants just as they are among a collection of microservices. Each informant should know very little ...
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