uml - sequence diagram in a specific situation -


hello i'm studying sequence diagram. example there 2 actors, actor trader has online shop. actor customer buys trader's products. how represent situation when trader storing products database or when customer buying product? possible use cases insertproduct , buyproduct. database part of system, no other actor communicates system. i've not understood how represent situation when communication among actors not in "real-time". in advance.

you need split things @jiml suggests. use case best shown activity diagram have single actions representing steps search/pay/etc.

when design domain find technical classes store etc. actor can send messages buy(item) etc.

the whole story more lengthy , off-topic so.


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