c# - Event aggregator and BLL -

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i've got winform app 3 layer architecture

  • ui
  • bll (business logic/layer)
  • dal (data access layer)

the dal contains factory instantiate proxies used communicate various apis, require credentials of private methods

when app starts, 1 or more proxies initialised singletons (1 per api). references singleton kept within app @ ui , bll levels (and maybedal later).

the user can choose @ time modify api credentials via ui. in case, want initialise new instances of the singletons, , make sure correct instances used everywhere (ui, bll, dal)

what did far is:

  • notify factory of credentials changes, singletons reinitialised
  • used event aggregator pattern in ui, components holding references singleton notified of credential changes , call proxy factory fresh instance

however, wanted use event aggregator pattern in ui. question is: how notify objects in bll/dal of change?

a solution never hold instances , call factory, there way of doing want properly?

edit: have classes in bll keep instances of different kind of proxy (not initialised through factory). how notify these bll classes must refresh instance?

thanks


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