Business delegate pattern: Difference between revisions

Revision as of 11:25, 7 September 2018

Revision as of 15:28, 6 October 2018

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'''Business delegate''' is a [[Java Platform, Enterprise Edition|Java EE]] design pattern.

<ref name=":o_cjp">{{Cite web|url = http://www.oracle.com/technetwork/java/businessdelegate-137562.html|title = Core J2EE Patterns -– Business Delegate|date = |accessdate = 22 June 2016|website = Oracle|publisher = Oracle|last = |first = }}</ref> This pattern is directing to reduce the [[Coupling (computer programming)|coupling]] in between business services and the connected presentation- tier, and to hide the implementation details of services (including lookup and accessibility of [[Enterprise JavaBeans|EJB]] architecture).<ref name=":o_cjp"/><ref name=":stdd">{{Cite book|title = Screening Technical Design Document -– Version 2.0|last = |first = |publisher = Indiana state|year = |___location = Indiana, USA|volume = |pages = 7}}</ref> Business delegates acts as an adaptor to invoke business objects from the presentation tier.<ref name=":pjeesp">{{Cite book|title = Pro Java EE Spring Patterns|last = Kayal|first = D.|publisher = Apress|year = 2008|___location = New York|volume = |pages = 161–166}}</ref>

==Structure==

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====Business delegate====

Control and protection are provided through business delegate which can have two types of constructures, without ID and with ID, where ID is a string version of the reference to a remote object such as EJBHome or EJBObject.<ref name=":o_cjp"/>

ID is a string version of the reference to a remote object such as EJBHome or EJBObject.<ref name=":o_cjp"/>

====Lookup Service====

Business service is located by lookup service which is used by the business delegate. The implementation details of business service lookup is encapsulated by lookup service.<ref name=":o_cjp"/>

====Business Service====

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==Concerns==

Following concersconcerns can be considered:

* Maintenance due to the extra layer that increases the number of classes in the application.

* Business delegate should take care of the changes of the remote business object interfaces, and these types of changes are rare.<ref name=":pjeesp"/>

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Remote interface for ResouceSessionResourceSession:

<source lang="java">