DDD Taiwan Community iDDD讀書會打完收工啦!

1. © 2019, Domain Driven Design Taiwan Community
Kim Kao ( )
Aug 01, 2019
Aggregate + Event Sourcing

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Event sourcing –
•
• :
•

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?
• ( )
• (Event Store)
:
•
•
• (pub/sub)
• RDBMS+ pub/sub
• NoSQL + pub/sub
• ...

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•
• : update ... Set vs append only logging...
• Reliability
• à .. Etc
•

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?
•
à Event Storming workshop
• à
• (2013)
•
• CQRS
• Command-Query-Responsibility-Segregation

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Application Service
1.
2.
( replay
Entity Id )
/
( )

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– EventStore, domain Service

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-

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C#

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1. mutate
2. lock
3. Apply Event
4.
5.
6. ... looping

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•
• , class for state
• , class for behavior

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clone

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•
• Application Service à Domain Service
• Get Aggregate root instance by Id
• Fetch corresponding event streams
• Replay to get current status ( )
•
• Aggregate
• ,
•

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...
, lambda ...

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Command Handler

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command

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command

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Command

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Queue

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Concurrency control
• thread
:
throw EventStoreConcurrencyException
at step 4

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• Thread2 while loop
event 1~5
• Thread2 6~7
•
•

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• à
•
•
• ( )
•

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• EventStore AWS S3 bucket.. Unlimited
capacity
•
•

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1.
2.

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EventStore
https://github.com/jimitndiaye/lokad-iddd-sample
https://github.com/abdullin/lokad-cqrs

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31. © 2019, Domain Driven Design Taiwan Community