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jschell wrote: I have been doing it for 40 years and have used Fortran, Basic(various flavors), Pascal, assembly (different flavors), C, C++, C#, Java, Perl, various SQL
dialects and various scripting languages.
Awesome. Same here, pretty much. You just have 8 years on me 
jschell wrote: You failed to mention maintenance costs and total life cycle costs in anything you said.
You're right... I didn't say anything about that.
jschell wrote: Which might be because you don't understand maintenance costs an life cycle costs.
The fact that you understand the code means nothing it terms
of whether someone else can understand it. And in the vast majority of professional programming software that actually reaches production will require that someone else besides the original programmer must understand it at some time.
While I didn't mention anything about total cost for maintenance, it doesn't mean I don't understand or value the need for maintainable code from a cost perspective, nor does it mean that I don't value having code that is readable by others. On the contrary, maintainability, TCO and readability are all extremely high on my list of what I value. I didn't mention it in my OP simply because it is... in my opinion... secondary to design and implementation that considers performance (accuracy and stability assumed) as the higher priority. If I am faced with the choice between code that executes twice as fast and code that is twice as readable, I choose performance every time... but then comment appropriately.
For example, I had a project about 10 years ago in C++ that required some software-based imaging processing. Performance was really critical, and the math could have been done step by step, calling various other functions to make the code really, really readable... but putting a particular transformation on ONE LINE helped with compiler optimization to the point where it ran literally 10x faster. So, I wrote it BOTH ways... the "easy to read" way that perfectly expressed the logic of the algorithm, and the ugly but fast-executing way, and left the "easy to read" way as a comment block in order to aid future coders in seeing what was actually going on.
In contrast, there's a fairly popular game out right now that is written (AFAIK) in a highly tiered OO approach, and it's charming 8-bit graphics and blocky environments that are comparable to the technology of the classic DOOM/DOOM II era in the 90's, is so inconsiderate of performance issues that it can bring a Core i7 with dual top-end graphics cards to its knees... that one's a real head-scratcher.
jschell wrote: Your large method idea was one that even structured programmers rejected long ago and that rejection is further demonstrated by the wide and rapid acceptance of Object Oriented programming.
As with all things this is not an absolute mandate in that every thing must be broken into smaller pieces but the vast majority should. And at least in my experience code that fails to do this generally is often obviously not based on an OO design.
I wasn't trying to say that large methods were specifically desirable, only that they shouldn't be shunned as "don't ever ever do this" kind of practices. IMO, a given construct should be used when it's appropriate... always. If a piece of functionality would benefit from a monolithic approach, it should be done that way. If a piece of functionality benefits from an highly tiered OO approach, then it should be done that way. I'm advocating a more liberal approach to design and implementation, not a specifically monolithic approach. The right approach for the right situation. Period.
jschell wrote: Because performance is most significantly impacted by requirements and design. Not implementation.
I don't agree at all. I think any design (good or bad) can be implemented with either fast or slow executing code, and my original point was that it seems the practices being widely adopted in the past 5 to 10 years are definitely not in favor of speed of execution, and I don't understand that.
jschell wrote: Huh? Because it costs money to produce software. It costs money to fix bugs in production. Because it costs money if one losses market share due to long lead times.
Now here, you make a good point that I agree with. I just don't know that a more liberal approach (as I'm advocating) is necessarily the anticedent of time efficiency... though it can be, of course. I just don't think it needs to be that way.
modified 10-Dec-12 8:27am.
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Robb Ryniak wrote: secondary to design and implementation that considers
performance (accuracy and stability assumed) as the higher priority. If I am
faced with the choice between code that executes twice as fast and code that is
twice as readable, I choose performance every time... but then comment
appropriately.
I don't care how fast the code executes - what matters is how fast the application works. There are often many tasks in an application which would have zero impact on the primary performance of the application. Yet there are also many tasks that still must exist for the application to be fully functional. Making all of those unreadable for the sake of performance that means nothing is not a good investment.
Robb Ryniak wrote: For example, I had a project about 10 years ago in C++...
For example I had a project in Java a bit more than 10 years ago which the estimated run time was 8 to 12 hours with a 3 month development cost. Removing one requirement which the user didn't even want reduced the estimated run time to a couple of minutes (and implemented run time to less than that) and the development time to a couple of days.
Robb Ryniak wrote: In contrast, there's a fairly popular game out right now that is written ...
And you are suggesting that is solely a implementation problem and has nothing to do with design?
Robb Ryniak wrote: I wasn't trying to say that large methods were specifically
desirable, only that they shouldn't be shunned as "don't ever
ever do this" kind of practices
As I stated, in my experience, large code blocks like that are usually the result of poor or no OO understanding. So avoiding them provides a way to mitigate a design problem - not an implementation problem.
Robb Ryniak wrote: I don't agree at all. I think any design (good or bad) can be implemented with
either fast or slow executing code,
Not in my experience. And nothing I have ever read suggests that to be true in a general way. And that isn't a recent trend either. I can remember seeing the same view point in the 90's.
Robb Ryniak wrote: I just don't think it needs to be that way.
Far as I can tell your viewpoint would lead exactly to that. Promoting performance as the goal means that developers are going to spend a lot of time optimizing code to achieve that goal - for specific code blocks. While performance measurements would demonstrate that most of the code has no impact on the primary core functionality of the application.
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jschell wrote: Making all of those unreadable for the sake of performance that means nothing is not a good investment.
Agreed. I wasn't suggesting making code unreadable! (yikes!) I am however, all for favoring performance over "perfect" readability, and worrying more about the art of performance than the "coding standard du jour"... which is in contstant flux anyhow.
And that also assumes that performance is an issue for the given application. Not every app needs to be perfectly optimized. (I'm guessing you don't spend a lot of time writing games?)
jschell wrote: For example I had a project in Java a bit more than 10 years ago which the estimated run time was 8 to 12 hours with a 3 month development cost. Removing one requirement which the user didn't even want reduced the estimated run time to a couple of minutes (and implemented run time to less than that) and the development time to a couple of days
I'm sure we can both think of examples where either requirements or implementation have had a dramatic performance impact. I refuse to be dogmatic about either... let's just say, good requirements and good implementation together make for a mutual win... agreed?
jschell wrote: And you are suggesting that is solely a implementation problem and has nothing to do with design?
Nope. Not suggesting that at all. I am however suggesting that with the game-in-question's poor level of performance, something's very likely very wrong with the implementation... more than likely the design as well. My point was simply that bad performance seems to be astonishingly prevelant and rather than discussing how to get better performance (from either the design or implementation point of view, or better: both) far too many developers these days seem to rather want to discuss why it's good or bad to use standard A or standard B than to discuss how to make code that's both reliable and powerful.
Unless you're suggesting that an implementation can't possibly wreck the performance of an otherwise perfectly good set of requirements? If that's your assertion, then I don't think we're going to see eye to eye on this point. I think both design and implementation have to be a win.
jschell wrote: Far as I can tell your viewpoint would lead exactly to that. Promoting performance as the goal means that developers are going to spend a lot of time optimizing code to achieve that goal - for specific code blocks. While
performance measurements would demonstrate that most of the code has no impact on the primary core functionality of the application
I suppose it depends on the application... for a word processing app, there's not as much concern for performance as their would be for game programming or a scientific app that's processing some intensive mathematics. I suppose it may have seemed like I was making blanket statements that all apps written by all programs must be perfectly optimized for perfect performance... but that's not what I was implying, nor is that very practical. But when I see applications that really should have a performance focus (like games) seem absolutely complacent about the issue (as apparent by the results), then that's a pretty big problem imo. ...and I just don't see people discussing performance anymore... not as much anyhow. The focus is on when and if to use regions, or how compact is your method, or how many fields do you have, or does your code comply with some rules based app, or whether or not WPF is going to stand the test of time. Not that those things don't bear discussion, but where's the love for performance? It just seems that it gets virtually no attention these days.
Oh, and for the record, I'm not promoting that developers spend 10x as long coding in order to optimize code. I'm promoting knowing how to write fast executing code from the get-go so you don't need to optimize it much later if at all... I'm promoting senior developers sharing such techniques with the up-and-comers so they too can avoid machine-clogging code bloat. There's an art form that just seems to be lost, or at least not discussed much these days... and I miss it. That's all I'm saying.
I suppose I'm just being nostalgic for the days where I (and the two other coders in my town lol) would sit around sharing tips and discoveries on how to achieve much more with much less. Those times made me a far better coder than I ever would have been otherwise.
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Robb Ryniak wrote: And that also assumes that performance is an issue for the given
application. Not every app needs to be perfectly optimized. (I'm guessing you
don't spend a lot of time writing games?)
Most applications do not need optimized instruction processing. And game software is a small part of the developer space.
Robb Ryniak wrote: let's just say, good requirements and good implementation together make for a
mutual win... agreed?
Except a "good" implementation is not equivalent to one that has been micro optimized for speed.
Robb Ryniak wrote: Nope. Not suggesting that at all. I am however
suggesting that with the game-in-question's poor level of performance,
something's very likely very wrong with the implementation...
And I would suppose that a better design would eliminate almost all of the performance problems.
Robb Ryniak wrote: Unless you're suggesting that an implementation can't possibly wreck the
performance of an otherwise perfectly good set of requirements?
A poor design can certainly wreck requirements. A poor implementation might or might not depending on what "poor" means. In terms of speed, excluding design problems at the implementation level, a "poor" implementation cannot be substantially improved solely by changes to the implementation.
Robb Ryniak wrote: I think both design and implementation have to be a win.
If there are performance problems with a good design then I can use a profiler to get the best that can be gotten from the app.
If there are performance problems caused by a poor design then the application will need to be refactored.
Robb Ryniak wrote: as their would be for game programming or a scientific app that's processing
some intensive mathematics.
Or embedded controllers. HOWEVER those are very small parts of overall development.
And I can give you a specific example - how fast does the configuration setup for a game need to be? Do you want a developer spending two weeks to improve that by 10%?
Robb Ryniak wrote: ..and I just don't see people discussing performance anymore...
I do. They often have a small bit of code and they want to make if faster. On further questioning one often finds that they decided it needed improvement as a whim and didn't use a profiler to localize a problem. Actually they often do not even know what a profiler is.
Robb Ryniak wrote: It just seems that it gets virtually no attention these days.
Because in the context that you are driving at it is meaningless for most work. I care if my database really can hold 20 billino rows and how to insure, via the design, that a projected data storage need like that does not become a problem. I care that a server can handle 100 txns a second but don't need it to handle 1000 because the market segment and known drivers will never require a large number of servers. But I can't add another order of magnitude to either of those by profiling an implementation. The design and architecture must be created to handle those loads an that drives the implementation.
And this supposes even that there is an actual realistic need for high volumes. Some people decide that the server must handle large numbers without doing any sizing in the first place. One can find that even if they own the entire market that they wouldn't have the needs that they claim.
Robb Ryniak wrote: I'm promoting knowing how to write fast executing code from the
get-go so you don't need to optimize it much later if at all...
First that is promoting what you are claiming it isn't. Because if that is the emphasis then peole will need to learn it for every code block they touch.
Second, as I said, most code does not need it. Profiling will tell one exactly where implementation bottlenecks are. And one can then make updates and design compromises to optimize those areas.
Robb Ryniak wrote: I suppose I'm just being nostalgic for the days where I...
And at one time I had the entire compiler API memorized, understood how the entire API worked, understood a great deal about how the OS worked and even how the computer boot up worked (at the assembly instruction level.)
But times change.
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jschell wrote: Most applications do not need optimized instruction processing. And game software is a small part of the developer space.
...
Or embedded controllers. HOWEVER those are very small parts of overall development.
And I can give you a specific example - how fast does the configuration setup for a game need to be? Do you want a developer spending two weeks to improve that by 10%?
You're absolutely right about that much... having been writing games since the age of 8 (well, OK, crazy simple ones back then, though they sure felt awesome at the time lol), I do tend to give those smaller parts of the overall developer space a far larger place in my heart than what is represented by the overall community in practice. I don't write games exclusively of course. I deal with all sorts of applications; but if I'm not working on a game, I'm usually wishing I was.  So, honestly, I do have a specific bias, and I recognize that.
And you're right about much of what you said on the other things you wrote in your last post as well... I'm not going to quote every line, but the bottom line is that certain applications really don't need micro-optimization at all, and I wouldn't waste my time doing it. Games are one thing... where every frame matters, and (with the exception of online components) the execution is local and very much hardware dependant, so micro-optimization can make a difference... but then that's really part of the requirements, isn't it? As many FPS as possible on the lowest end hardware possible. (Unless you work for Crytek, in which case, feel free to consider only the highest end hardware - the users will catch up eventually. lol)
At any rate, I still stand that implementation in any project that is conscientious of performance will do better than if performance is not considered at all. I'm not suggesting that an enterprise class database system needs performance tuning for of every line of code - after all, a piece of code that is called even once every few seconds, does it really matter if it runs at 0.005 seconds or 0.05 seconds? An order of magnitude, yes, but not really a very high impact to the whole of the project... so we can agree there I'm sure. But at least being conscientious of the performance of code while it's being written will go a long way to make sure an implementation isn't overly bloated.
I have a semi-regular project (occasional feature additions, etc.) through a developer who created a database system that is robust, but frustratingly overengineered. (Too many "what if's" and not enough "what's it really need to do's".) I had to build a new machine just to run their developement platform. And that was a design issue, to be sure. So your arguments hold up well in my experience as far as database applications go. That said, I can see situations where poor implementations that work within the confines of a set of requirements could definitely wreak havoc on overall performance. Let's say a customer has the need of managing a large tree of of data (akin to a file system tree) and wants the GUI to show all the nodes. OK, no problem. Just load the data, parse into a tree, etc. Easy enough. What if, however, the programmer chose to iterate through the tree with individual select hits in the DB in order to keep the code small, and not deal with in-memory structures to sort the data into a tree? (Assuming appropriately sized data.) Hitting the DB over and over would wreck performance, to be sure. But then... I guess we're not dealing with someone very experienced in that situation - so I suppose what you've been contending holds true most of the time in practice.
jschell wrote: Actually they often do not even know what a profiler is.
Huh? What's a profiler? ...OK, just kidding. Seriously though, it does surprise me to hear people being unfamiliar with common tools. It's like not having ever heard of source control, or not knowing the difference between an IDE and Notepad. Odd. But I guess nobody's born with the information...
jschell wrote: And at one time I had the entire compiler API memorized, understood how the entire API worked, understood a great deal about how the OS worked and even how the computer boot up worked (at the assembly instruction level.)
But times change.
 (sniff) Yes they do. I miss DOS.  (okay, only a little.  )
*** Listening to the song: "INT 21h, where did you go?" *** ...OK, not really. 
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Robb Ryniak wrote: where every frame matters, and (with the exception of online components) the
execution is local and very much hardware dependant, so micro-optimization can
make a difference
Some games, not all. As an example card games don't require much of anything in the way of graphics optimization. And some don't even require optimization for strategy - for example solitaire.
Robb Ryniak wrote: Let's say a customer has the need of managing a large tree of of data (akin to
a file system tree) and wants the GUI to show all the nodes....
However the way you phrased it means that it is either a requirements and/or design problem. So one one look at the problem at that level before one implements anything.
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jschell wrote: Some games, not all. As an example card games don't require much of anything in the way of graphics optimization. And some don't even require optimization for strategy - for example solitaire
Come on now, Solitaire's not really game lol... seriously though, I meant "graphically rich games like first person shooters like the Doom franchise, Crysis, F.E.A.R, and RTS like AoE, etc."... you know, the kinda games *I* play. Anything else is "just an app" lolol. (How's that for tunnel vision?? lol) But your point stands - anyone remember those simple (but oddly fun) games that Microsoft released in the Win 3.x era? The "entertainment pack" with Klotski, that mouse/cheese game, etc.? Yeah, not alot of optimization needed there either. At any rate, once we got talking on the same wavelength I think we understand each other well enough.
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The guidelines/best practice/patterns/rules are there to capture knowledge of many coders.
If you try to refactor your code to adhere some standard, you are digging into the whys and hows of others. I would claim that any coder can only get better from such an experience.
If you fancy performance try run FxCop from Microsoft against
your C# code - FxCop has a set of rules that questions different coding constructs. Example: Do you initialize fields with default values e.g.
private bool foo = false;
CheckStyle for ![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif) is also worthwhile to incorporate in your daily coding... that is if an old dog want to learn some new tricks
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Keld Ølykke wrote: If you try to refactor your code to adhere some standard, you are digging into
the whys and hows of others. I would claim that any coder can only get better
from such an experience.
...and that is such an answer I was looking to get. That makes sense to me. Even if I wouldn't adopt such a policy for a project I was heading up, there is always value in understanding the practices of others, even if I don't agree with them. I have learned many times from other coders, even if I didn't agree with their approach, I can usually glean something useful from the experience. Thanks for the considered answer. 
Keld Ølykke wrote: that is if an old dog want to learn some new tricks
Pfft... I'm not that old... (am I? lol) Seriously, if I wasn't interested in learning new stuff, I'd have left the field decades ago. Ours is in industry in constant flux. Good and bad I guess.
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Ahh, this is falling into the classic mistake that a code smell indicates that there is an actual problem that needs solving. This isn't what a code smell is. A code smell refers to an indication that there could be a problem, not that there is one. When someone points out that "such and such is a code smell" should be taken to mean; you really need to take a look at what you did here and make sure that you haven't created a problem due to lack of understanding of a particular pattern, or through dropping out of loops early, etc.
Unfortunately, code smells have become dogma - so you'll hear that singletons are the mutated spawn of Satan, or long methods are Beelzebub's nasal excretions. Yes, your singleton might be wrong because you don't fully understand the impact it has, or your long method might actually chain 30 or 40 if statements deep in there, but if that's the logic that you have to follow in there, it doesn't actually make it wrong.
At the end of the day, this just comes down to knowing which battles you should be fighting in your code, and having an understanding of the implications of your code.
One small side note - performance isn't the be all and end all. If your code quickly arrives at the wrong answer, your code is still wrong. It's just wrong faster.
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Pete O'Hanlon wrote: Ahh, this is falling into the classic mistake that a code smell indicates that there is an actual problem that needs solving.
Yeah, I've been taking such "advice" with a grain of salt... it's just stuff I've seen posted by many seem to indicate that certain practices are "absolute don'ts" rather than "do it carefully", which gets a nice fat eyebrow raise from me... frankly, all coding should be done carefully, with purpose and understanding. I've just been having a hard time understanding how it has become so prevalant for so many to be so very dogmatic over very specific approaches, when there are probably much more important concerns, which seem to have gone largely abandoned over the years in favor of "flavors du jour".
Pete O'Hanlon wrote: One small side note - performance isn't the be all and end all. If your code quickly arrives at the wrong answer, your code is still wrong. It's just wrong faster.
Absolutely. Couldn't agree more. Assuming we're already talking about correct code that works... accurately, reliably, etc.; and is well commented (so others can make heads or tails of it) ...then in that case, I always choose performance over personal convenience.
I guess I simply assumed that the reader would implictly understand that accuracy was a given in my "most important lesson" - since code that's broken isn't really code at all - it's just... well... a mess. lol
"It's just wrong faster"... that's pretty funny (and well said)
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Robb Ryniak wrote: I guess I simply assumed that the reader would implictly understand that
accuracy was a given in my "most important lesson" - since code
that's broken isn't really code at all - it's just... well... a mess. lol
You've read the forum posts?
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Pete O'Hanlon wrote: You've read the forum posts?
Yep... but I must have received my delivery of "mind bleach"; yet I can't seem to remember if I got it or not.
(Funny signature btw, lol)
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Hi,
I'm searching for some open source software that is well designed and is designed for flexibility.
I'd like to study the source to understand how a well designed system is structured and developed.
I've read some books about design but the example are always small and self-contained. So I'd like to see how that work in a mid-big sized project that have different modules interacting.
If you people know any of this, could you please post the name or the link of the software.
If they're written in c#/java and well documented would be a plus.
Or if you have the name of some book on the argument maybe that cover a big software case study it would be even better.
Hope my english is understandable.
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Giuseppe Tollini wrote: mid-big sized project that have different modules interacting.
I would suspect that is a myth.
Applications, which are successful, grow over time and compromises are made based on real time problems. And although solutions work they are not always implemented ideally. And because of such problems were not known with the initial design then the design might need to be worked around.
Something similar occurs with libraries. Libraries however might be less impacted by this if the the functionalit in the library is disparate enough.
Both are also impacted by the desires and/or experience of those that work on it over time.
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Giuseppe Tollini wrote: I'm searching for some open source software that is well designed and is designed for flexibility.
I'd like to study the source to understand how a well designed system is structured and developed.
The only example that comes to mind is Linux.
Giuseppe Tollini wrote: I've read some books about design but the example are always small and self-contained. So I'd like to see how that work in a mid-big sized project that have different modules interacting.
Always specific to the system, it's not like there's "one ideal solution".
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We are designing some web services to communicate data updates between applications that we make. It's all about interoperability.
My lead dev. is thinking about making a pair of web services that "talk" to each other. The app that originates a data change could access a web service of the consuming app that simply says "I have data for you." The consuming app then uses SOAP/WebService protocols to ask for the data the the provider has indicated was available in the preceding exchange.
Is this just a simplistic way of doing something that is already a standard?
What would we call that process?
What terms should he be researching to learn more about how this is done nowadays?
Thank you
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I m a fresher but i think it is better to use messaging services like MSMQ or JMS depending on the technology used.
Regards,
Raj Champaneriya
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Bytescream wrote: It's all about interoperability.
And that is all about design and process control. Not technology.
Bytescream wrote: could access a web service of the consuming app that simply says "I have data
for you."
What happens if the other app isn't there - the one that is supposed to receive the data available message>
What happens if the other app receives the data available but then goes down before it can get the data?
What happens if the other app receives the data available message but just ignores it - it never tries to get the other data (yes that is a bug but is still something that the the orgination app must consider.)
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Hi,
i am looking to create a perl webservice which can be consumed from C# or VB.net.perl code in unix server.
Can some one help with an example?
Thanks
Hari
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ernestohari wrote: i am looking to create a perl webservice which can be consumed from C# or VB.net.perl code in unix server.
Can some one help with an example?
Tutorial building webservice with Perl[^]. There's enough examples out there on consuming a webservice using C#/VB.NET.
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I am busy developing a timesheet capture service which has a hierarchical user structure[1], where e.g. the top user in a hierarchy represents a distinct organization or related group of users. This user can then create more users under their self. This design has been laid down by my client. For authorization, I have interpreted this so that a user higher up in the user tree has access to all users below them in the tree, as well as entities owned by those lower users. This seems logical to me, as a user higher in the tree 'owns' users lower down. The client is not clear on whether this is the way to go, as in some situations it is ideal that users lower down have access to entities created by users above them in the tree. My client is unclear on what he wants here and expects some assistance in deriving a practical authorization scheme for this hierarchical user scheme.
Let me introduce the entity Customer to this scenario. Originally, a User owned Customers, so in my interpretation, a user higher up in the tree (more senior) had access to all customers owned by users lower down in the tree. This preserves the higher privilege of higher users, but prevents a more senior user creating customers for more junior users to work on. Now I have to change this one user to many customers relationship to many users to many customers, complicating things somewhat.
I'm not asking for a solution here, but some input and maybe suggestions or warnings for proceeding to try and devise a working authorization scheme for this complex matrix of user trees crossed with customer trees.
[1] Many other entities are also hierarchical, but not yet relevant here.
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Brady Kelly wrote: For authorization, I have interpreted this so that a user higher up in the user tree has access to all users below them in the tree, as well as entities owned by those lower users. This seems logical to me, as a user higher in the tree 'owns' users lower down.
I don't find that logical. If I were a node in your tree, I'd only pay attention to my parent - the topnode would never be relevant in my work. That's based on the idea of a "chain of command". If my bosses' boss could manage me directly, my boss would be superfluous. Better to check with the client whether your interpretation is correct.
Brady Kelly wrote: My client is unclear on what he wants here and expects some assistance in deriving a practical authorization scheme for this hierarchical user scheme.
"Authorization"? You mean the top-dog could login using my credentials?? There's bears down that road; it messes up audits.
Brady Kelly wrote: This preserves the higher privilege of higher users, but prevents a more senior user creating customers for more junior users to work on.
Not per se; just make sure that the junior is "part of" the group working on the customer 
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Thanks, I'm slowly discarding big parts of my original concept, and moving toward the tree just representing the org, and everyone in the org (in the tree) having access to everything else in the tree, but limited by user roles.
Eddy Vluggen wrote: "Authorization"? You mean the top-dog could login using my credentials?? There's bears down that road; it messes up audits.
Authorization doesn't involve logins, Authentication does.
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