Subject: Doubts on design patterns

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Subject: Doubts on design patterns

Subject: Doubts on design patterns

2004-04-28 - By Ram Kishore

Back

Reply: 1 2 3 4 5 6 7 8

Hi Ben,
Both Decorator and Chain of Responsibility (CoR) are dynamic in
nature. Decorator attach/detach the responsibilities at run time and COR
propagates the request thru a series of request handlers (decouples the
sender and receiver) and can do some pre or post processing on the
request.

Correct me If I'm wrong...don't you find any similarities b/w both of
them.

Ram.

-- --Original Message-- --
From: An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)] On Behalf Of Ben Hill
Sent: Wednesday, April 28, 2004 2:58 PM
To: J2EEPATTERNS-INTEREST@(protected)
Subject: Re: Doubts on design patterns

> -- --Original Message-- --
> From: Sergey Beryozkin [mailto:sberyozkin@(protected)]
> Sent: 28 April 2004 10:12
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Re: Doubts on design patterns
>
>
> Hi Ben, others
>
> Lets consider servlet filter chains. IMHO they may exhibit
> the characterstics of both patterns. A given filter decorates
> the request and/or response in most cases by pre and/or post
> processing it. When a filter blocks a request, then it acts
> as a final handler in the chain, as it assumes a
> responsibility for the actual handling of the request. Would
> you agree ? Thanks Sergey Beryozkin

Exactly! Servlet Filters are not GoF patterns, and so are not therefore
categorised in the GoF catalogue.

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