Spring

dispatcher sevlet

• a service that will distribute the request into their controller.
• ex) when “/abc/cde” request came, it will pass the request to the service/controller that has the same name.

DQM / DAO

• DQM doesn’t have beans => low reusability, and high cost
• DAO has beans with its respective sql IDs with execute plans => high reusability, low cost

Facade design pattern

• ~Service => ~ServiceImpl