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| Author |
what the weaknesses of the object oriented methodology
|
|
| OhYeah 2006-03-13, 3:57 am |
| what the weaknesses of the object oriented methodology?
| |
| H. S. Lahman 2006-03-13, 9:56 pm |
| Responding to OhYeah...
> what the weaknesses of the object oriented methodology?
The primary goal of the OO paradigm is providing software that is
adaptable over time in the face of volatile customer requirements. To
do that one pays a price. One price is that the paradigm itself is not
very intuitive compared to conventional programming that is very close
to the hardware computational models. The OO paradigm is designed to
map to customer domains rather than hardware domains. Thus the learning
curve is substantial.
Another price is in performance because the OOPL abstractions and
generalizations tend to require significant overhead. In fact, the
conversion from the customer domain view to the hardware domain view is,
itself, a source of implicit overhead because the language has to
provide "bootstrap" structures to map one domain to the other. Yet
another price is that the OO paradigm tends to be verbose because one
captures a lot of business rules and policies in static structures. So
developing an OO application usually takes somewhat longer than using
other approaches like functional programming.
Generally the OO paradigm is most useful in contexts where unique and
complex problems need to be solved AND where the customer requirements
tend to change significantly over time. So there are several areas
where the paradigm is not the best choice...
(1) CRUD/USER processing where the application is essentially just a
pipeline between a UI and and RDB. The RAD IDEs and layered model
infrastructures already do a good job of hiding a lot of the grunt work
and they will probably result in more efficient applications.
(2) Pure algorithmic processing using mathematical algorithms (e.g.,
typical Operations Research problems). Since the math doesn't change,
volatile requirements aren't an issue and one misses much of the benefit
of using the OO paradigm. So one doesn't use OO techniques to encode a
Quicksort algorithm even if one can identify abstractions like Pivot and
Partition.
(3) Linear processing. Things like parsing a particular LALR(1)
language or simple device drivers where each interface element (language
statement or driver command) has an independent path through the
application logic (i.e., no complex dependencies from one "command" to
another). [However, if one is designing a general purpose parsing
engine where the syntax is defined externally (e.g., via a BNF
specification), then one needs a more abstract approach and the OO
paradigm can be very useful. Similarly, if the device driver is complex
enough or the hardware details change frequently, the OO paradigm can be
useful.]
*************
There is nothing wrong with me that could
not be cured by a capful of Drano.
H. S. Lahman
hsl@pathfindermda.com
Pathfinder Solutions -- Put MDA to Work
http://www.pathfindermda.com
blog: http://pathfinderpeople.blogs.com/hslahman
(888)OOA-PATH
| |
| JXStern 2006-03-13, 9:56 pm |
| On 13 Mar 2006 00:06:16 -0800, "OhYeah" <zlxaaabbb@hotmail.com> wrote:
>what the weaknesses of the object oriented methodology?
The weakness is that it is not an omniscient silver bullet that solves
all problems without any thought.
So, any strengths it has are just relative to other methodologies, and
are still dependent, perhaps even more dependent, on skillful
application. The horror!
J.
| |
| xpyttl 2006-03-13, 9:56 pm |
| "JXStern" <JXSternChangeX2R@gte.net> wrote in message
news:b8ib12lm4eectq3ebb2io9fqr2c70g0sk9@
4ax.com...
> So, any strengths it has are just relative to other methodologies, and
> are still dependent, perhaps even more dependent, on skillful
> application. The horror!
Since "skillful application" seems out of style these days, does that imply
OO techniques are obsolete?
...
| |
| David Lightstone 2006-03-14, 7:56 am |
|
"xpyttl" <xpyttl_NOSPAM@earthling.net> wrote in message
news:ajmRf.171$O_3.57@fe05.lga...
> "JXStern" <JXSternChangeX2R@gte.net> wrote in message
> news:b8ib12lm4eectq3ebb2io9fqr2c70g0sk9@
4ax.com...
>
>
> Since "skillful application" seems out of style these days, does that
> imply OO techniques are obsolete?
>
> ..
No, it at best can only imply that practioneers generally lack the skill
needed to apply the OO "techniques"
>
>
| |
| Peter Dembinski 2006-03-20, 6:58 pm |
| "H. S. Lahman" <h.lahman@verizon.net> writes:
[...]
> So one doesn't use OO techniques to encode a Quicksort algorithm
Wrong. Object-orientation is very useful when solving algorithmic
problems. For example, consider a RoughSet class, that encapsulates
the implementation of a rough set with all the operations that can be
done on this data structure. Or consider a class encapsulating
an interval of floating point numbers, which could be very useful
when one implements numeric algorithms.
--
http://www.peter.dembinski.prv.pl
| |
| H. S. Lahman 2006-03-21, 10:03 pm |
| Responding to Dembinski...
>
>
> Wrong. Object-orientation is very useful when solving algorithmic
> problems. For example, consider a RoughSet class, that encapsulates
> the implementation of a rough set with all the operations that can be
> done on this data structure. Or consider a class encapsulating
> an interval of floating point numbers, which could be very useful
> when one implements numeric algorithms.
I don't know of any experienced OO developer who would dream of
splitting up the Quicksort algorithm into classes. It would be
overkill. One would encapsulate the algorithm in a single method (more
likely, as a library function invoked by a method).
The issue is that OO techniques are best suited for contexts where
requirements are volatile over time. So one wants to address things
that may change with OO while "hard-wiring" things that don't change
using more intuitive and compact paradigms. Mathematical algorithms
like Quicksort do not change over time so one is not concerned with
maintainability.
OTOH, I agree that there are plenty of scientific contexts where one
needs to manipulate multiple algorithms, provide ad hoc algorithms, or
substitute detailed elements of algorithms. In those contexts OO
techniques can be very useful for supplying the "glue". Your first
example could be in this category because you seem to modeling an
application of set theory, not a specific computational algorithm directly.
Similarly, your second example identifies a situation where the
mathematical algorithm has to be implemented within the constraints of a
Turing Machine environment. However, I would regard that as more of an
OOP tactical device. My point here was more about OOA/D; IOW, the
overall design of solutions.
[BTW, I spent a decade doing operations research. But the OO was used
for all the peripheral stuff like UIs, DB access, problem setup, etc.
When I needed a linear programming solution, I invoked an external
package for the algorithm execution from within the OO application.]
*************
There is nothing wrong with me that could
not be cured by a capful of Drano.
H. S. Lahman
hsl@pathfindermda.com
Pathfinder Solutions -- Put MDA to Work
http://www.pathfindermda.com
blog: http://pathfinderpeople.blogs.com/hslahman
(888)OOA-PATH
| |
| Peter Dembinski 2006-03-23, 10:02 pm |
| "H. S. Lahman" <h.lahman@verizon.net> writes:
> Responding to Dembinski...
>
>
> I don't know of any experienced OO developer who would dream of
> splitting up the Quicksort algorithm into classes.
Could be, but implementing quicksort in a way it can be used
on collections of various comparable objects is quite common
practice.
> It would be overkill.
In embedded systems, it could be an overkill. In desktop computing
world, it doesn't have to be.
| |
| prtiglao@gmail.com 2006-03-23, 10:02 pm |
|
Peter Dembinski wrote:
> "H. S. Lahman" <h.lahman@verizon.net> writes:
>
>
> Could be, but implementing quicksort in a way it can be used
> on collections of various comparable objects is quite common
> practice.
IMO, polymorphism =/= OOP. It is possible to use polymorphism in other
programming pardigms, isn't it? Like quicksort in C std library for
example does
polymorphism well. Not best example, but I'm sure better ones exist in
other languages. (Probably a good Haskell one I bet :) Dunno much
Haskell though)
--Dragontamer
| |
| H. S. Lahman 2006-03-24, 7:06 pm |
| Responding to Dembinski...
>
>
> Could be, but implementing quicksort in a way it can be used
> on collections of various comparable objects is quite common
> practice.
Sure. But that is a new requirement. One can meet it in a variety of
ways that are not necessarily OO, such as using a callback for the
element compare (a la the C standard library), using type polymorphism
at the 3GL level (e.g., STL), using multiple library entry points, etc..
At another level, I don't think this is a good example. The only thing
that needs to be polymorphic here is the method signature and one can do
that by overloading the method in the "owning" class. That is, there is
no reason to provide a Facade class that hides collaborations among peer
object like Pivot and Partition that further decompose the behavior
responsibility.
>
>
> In embedded systems, it could be an overkill. In desktop computing
> world, it doesn't have to be.
I don't see why. The basic issue is that the algorithm doesn't change
over the life of the application (or set of applications!) and that is
true for any sort of computing. There are more efficient and elegant
ways of encoding raw algorithms in that situation.
--
*************
There is nothing wrong with me that could
not be cured by a capful of Drano.
H. S. Lahman
hsl@pathfindermda.com
Pathfinder Solutions -- Put MDA to Work
http://www.pathfindermda.com
blog: http://pathfinderpeople.blogs.com/hslahman
(888)OOA-PATH
| |
| ComputerBob 2006-03-29, 8:13 pm |
| quote:
Originally posted by OhYeah
what the weaknesses of the object oriented methodology?
Gentlemen,
Sorry I read enough. Narrow minded people no wonder you mock OO. I am what you call an OO or RAD developer also a database developer. I even way back programmed punch cards, so I have seen it all. Object Oriented was designed to not have to do it twice (reusability) and there is also a separation between data and the application which is the manageability of application development for any industry. I do not care if you are talking science, medical, or business statistics the application and database rules are all the same. Our theory in those days was why reinvent the wheel every time.
As a software engineer I look at what problems I have to tackle today. In the object oriented world once we resolve an issue we go on. Object oriented has no weaknesses except ignorance. And to be a software engineer you must understand the whole machine not that I can write a better algorithm. We all in this industry try to make our code easy to read and as short as possible. KISS!
Anyway being in this business a perfectly designed system has no flaws. In OO we can use something developed again and again once it proves to be efficient. Yes there is memory overhead but memory is cheap now a day’s which memory is the most efficient way to get code to the processor. Basically, how is any part of this methodology a weakness? It is not! The whole personal computer is built on these methodologies from the network on up.
You want to know the weakness is people not see farther then their noses. Technical babble is all it is. Our whole system is built on OO and it works! It can not be exploited because it is multi-level or n-tier.
Best Regards,
Bob Zagars
Senior Software Engineer
Zagars & Evans, Inc | |
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