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how to model connection between service and dao in uml

 
Greenhorn
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How do we show relationship between a SampleController class that uses a SampleService class that is implemented by SampleServiceImpl, and SampleServiceImpl uses GenericDao<Sample> interface that is implemented by GenericDaoImpl<Sample> ?

can service be connected with dao by aggregation? (dao is part of service?)
or aggretation is used only to domain classes?

can we use any 'arrow' here? in which direction?
or we simply represent daos as properties?
 
Ranch Hand
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Service interface doesn't have any relationship to Dao.

SampleServiceImpl have dependency to GenericDao. So you can use dependency.
 
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