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From Stephen Cameron <>
Subject caching value objects
Date Thu, 17 Aug 2017 05:41:00 GMT
Related to the discussion of value objects, they would seem to provide an
opportunity to cache lists of such values in domain service 'repositories',
(particularly if they are immutable and never deleted from a database?).
Something like a list of suburbs that is of restricted size but used
frequently would seem to be a good case for this.

So my question is how best to do such caching?

A similar caching question has arisen for me but not with value objects
instead with 'identity' objects. I created such an identity class as a
means of providing faster look-up of clients in a system. This is the most
common task for the users: to find a person/client and read/change some
aspect of their record. As the Client class is quite big, creating a list
of all clients just to choose one of them was too slow. So, I created a
'ClientIdentity' class that has just the client id and the name of the
client, the latter to present to the user via a choicesN.... method, and
once that single ClientIdentity object has been chosen the related Client
class is retrieved and used.

I would seem that such identity objects would also be a good candidate for
domain service caching.

Just maybe this is not a good idea.


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