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CQRS, Event Sourcing
and Microservices
Marcelo Cure
CQRS
Command Query Responsibility Segregation
Pattern;
Greg Young;
Separation of Reads and Writes in Commands and Queries;
Commands - mutates state;
Queries - returns a value;
Draw it for me
Pros/Cons
Pros
Separate write/read logic;
Use separated databases for read/write;
Helps system with complex domain;
Cons
Generates complexity;
When to use or not ...
Use
Complex domain;
DDD;
Specific bounded-contexts;
Do not use
In the whole system;
Too simple systems;
CustomerService example
Customer GetCustomer(CustomerId);
CustomerSet GetCustomersWithName(Name);
CustomerSet GetPreferredCustomers();
void MakeCustomerPreferred(CustomerId);
void ChangeCustomerLocale(CustomerId, NewLocale);
void CreateCustomer(Customer);
void EditCustomerDetails(CustomerDetails);
Applying CQRS
CustomerWriteService
void MakeCustomerPreferred(CustomerId)
void ChangeCustomerLocale(CustomerId, NewLocale)
void CreateCustomer(Customer)
void EditCustomerDetails(CustomerDetails)
CustomerReadService
Customer GetCustomer(CustomerId)
CustomerSet GetCustomersWithName(Name)
Each application state change is a new event;
Sequence of events;
Reconstruct past states with event log (replay);
Events can generate other events;
Event Sourcing
Draw it for me
For each action:
Store event in Event Store;
Aggregate;
Propagate event;
Example - order creation
All
together
now
Thanks

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