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A simplified (in memory) example of Event Sourcing implementation for banking domain.

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Event sourcing example in Java

A simplified (in memory) example of Event Sourcing implementation in Java for banking domain. Repository is splitted into exercises adding step by step more functionality towards good design of event sourcing with CQRS. You can play around and try to implement exercises or You can check out solution branches.

Step 1 - In memory iplementation of event sourcing

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  • Provide simple in-memory implementation of Event Store
  • Make all test passing using event sourcing

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Step 1a (optional) - Unit of work pattern

  • Implement Unit of Work pattern where events are stored outside of aggregate

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  • WIP

Step 1b (optional) - Projections

  • Implement Projections on Account to get number of transactions performed on account
  • eventStore.store() method shoud accept Event playload instead of domain Events
  • what should be api of eventStream()?

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  • WIP

Step 2 (optional) - Optimistic locking

  • add optimistic locking

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  • WIP

Step 3 - new Aggregate extraction

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  • Refactor to move all money transfer related stuff to separate aggregate
  • New aggregate will be also using Event Store

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  • WIP

Step 4 - adding CQRS

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  • Apply CQRS rule and separate the command and reading side
  • Solution will use Eventual Consistency approach

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  • WIP

Step 5

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  • WIP

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A simplified (in memory) example of Event Sourcing implementation for banking domain.

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