Tuesday, October 3, 2006

loose coupling in OO and beyond

See also posts on
[[ facade: loose coupling && fewer dependencies ]]

-- examples
synchronous ^ mq
mvc -- loose coupling between M, V and C
javascript + java + stored proc

web service client and server rely on RMI/RPC and are more coupled (than http client/server), but both agree on an xml format to reduce coupling.

-- keywords (and synonyms)
easy edits -- not possible in an entangled system. Edits to source code should not break other (battle tested, production quality) classes. [[ declarative control -- enterprise design pattern ]]

change isolation -- "changes" to one system component had better be isolated from the other components. I think isolation is shown between javascript, java and stored proc

"runtime change" -- to object behaviour, without breaking other classes [[ runtime change to object behaviour ]], [[ create functionality without jvm restart]strategy ]]

"expected services" -- [[ de-couple - using abstract^concrete class ]]

knowledge -- "Object A must know everything about Object B" means tight-coupling. Loose-coupling means A only need to know the expected services of the interface B implements. The interface specifies/constitutes often a very loose contract between A and B. "So long as you support the expected service, i don't care how you implement it internally." Consider SSH client/server.

cohesion

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