Method Detail

• abstract Customer findCustomerByUserId(String userId)

  Finds Customer based on its user identifier.

  The user identifier can be many things. It can be something like a username or an email for registered users. For anonymous users, it can be an artificial identifier extracted from a cookie or session id.

  It is vital to distinguish user identifiers from corresponding CustomerId. CustomerId is stored and remembered for registered users, and it is mapped to the current user identifier. While we can change the user identifier and even delete it, we can not change the CustomerId. In customer management bounded context, CustomerId can be deleted, though. But events containing it cannot be removed, of course.

  For anonymous users, CustomerId will probably be constructed on the fly and probably not stored in the customer management bounded context. The corresponding mapping to the user identifier will be short-lived in that case. When an anonymous user deletes its temporary identifier (session closed or cookie deleted), there will be no way to access data related to the corresponding CustomerId.

  The implementation of this operation may throw DomainException if customer can not be found. Message key for such exception can be something like 'customerByUserIdPortOut.findCustomerByUserId.notFound'.