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Event Store

Chronicle offers what is called an event store which basically means a special purpose database for storing events. The events are stored in event sequences.

In addition to this, the Chronicle event store also maintains information about things like the event types, observers, projections and more.

The Chronicle event store is built on top of MongoDB. In a production environment you have to bring your own MongoDB environment and configure Chronicle to work with it. For local development, Chronicle provides a development Docker image that comes with MongoDB bundled inside it.

append · read
Event store
tenant-a namespace
event sequences
Default namespace
event sequences

(the event log)
also tracks: event types ·

observers · projections · …
Your application
MongoDB

Namespaces

Section titled “Namespaces”

Every event store can have namespaces. The namespaces provides a way to segregate data that is specific for a partition. Typically, a namespace can be used for multi-tenancy.

By default, Chronicle will use the Default namespace if a namespace is not provided.