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• In anything at all, perfection is finally
  attained
• not when there is no longer anything to add
• but when there is no longer anything to take away
  . . .

. . . when a body has been stripped down to its
nakedness.
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Just to be precise . . .

• The Naked Objects pattern
• The Naked Objects framework

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Best practice in contemporary business systems
design splits an application into four principal
layers
Presentation
Application, Process, Task or Controller
Domain object model
Persistence
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The Naked Objects Pattern eliminates the
controller layer by encapsulating all business
functionality on the entity objects
Presentation
Application, Process or Use-case controller
Domain object model
Persistence
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And has a generic presentation layer that
automatically reflects the domain object model as
an object-oriented user interface
Presentation
Application, Process or Use-case controller
Domain object model
Persistence
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For a standalone system, or for prototyping, it
is also possible to auto-generate the persistence
from the same domain model
Presentation
Application, Process or Use-case controller
Domain object model
Persistence
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There are four principal benefits of using the
Naked Objects Pattern

• Benefits to the development process
• Faster development cycle because you dont have
  to develop any UI code
• A common language between developers and users
  during requirements analysis
• Benefits to the developed product
• Improved object modelling leading to simpler and
  more agile business systems
• An empowering user interface

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CarServ A tale of two business applications
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Java classes written Methods written Lines of code written Unique external method calls
CarServ1 A conventional 4-tier Java implementation 190 788 7304 101
CarServ2 Similar functionality re-written using Naked Objects 27 234 1666 49
excluding java.lang and java.util packages
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Using Naked Objects greatly facilitated
communication between developers and business
representatives, during the discussion of
requirements - Safeway Stores, survey of users
and developers
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Using naked objects we were able to prototype
the underlying object model at least as rapidly
as we could normally have prototyped screenshots
alone
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(Developers) I found that being able to
prototype in front of users to be an effective
way of working
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Using naked objects significantly improved my
understanding of object-oriented techniques in
general
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(Demo)
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DSFA users The new system permits me to better
deal with the needs of individual customers
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I value the flexibility that the system provides
in choosing how to undertake a task
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I like the look and feel of the user interface
on this system
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I am generally satisfied with the new system
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The system makes me feel more empowered as an
individual
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The new system contributes positively to my
sense of job satisfaction