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I am researching some standard models for Datawarehouse of accounting/ financial model? Is there any recommended books or knowledge base for these? I would like to find some best practice samples or the good way to identify the model. Any advice is really appreciated. Thanks!
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He's got every model and relation under the sun. Sometimes its easier to reverse engineer Quick Books or something similar.
https://www.amazon.ca/Len-Silverston/e/B000APUYFQ/ref=dp_byline_cont_book_1
For data warehouses (publications), the keyword is "snow flake".
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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With the hodgepodge of frameworks available to make Windows applications these days - MFC, WinForms, WPF, WinUI, UWP, MAUI, Blazor Hybrid - and that's just the ones made by Microsoft! - it's really difficult to know which are suitable for a modern commercial application.
Rather than ask for recommendations or believe marketing hype, the best evidence for whether a framework or language is good is who's actually developing commercially successful applications with it. So what frameworks and languages are the big commercial shops using when publishing Windows applications these days?
Specific applications I'd like to know about are -
- Microsoft Office for Windows - this appears to be C++ with some kind of Javascript engine. There might be some .NET in there but it doesn't seem to be prevalent. I'm guessing they're using DirectComposition and have a homegrown control library that's completely untethered from the OS, but does anyone know for sure?
- Adobe Suite - also appears to be C++, but I'm guessing they have some home-grown cross-platform framework that allows them to keep the Mac and Windows versions in sync easily.
- Visual Studio IDE (not Code) - At one point this was WPF, but I can't tell what it is now.
- Slack - Electron maybe?
- Google Chrome - Obviously not .NET - guessing C++ and DirectComposition?
Secondarily, I can't find any evidence that big commercial applications are actually written using any of the Microsoft frameworks that are publicly available, other than perhaps WPF. UWP, WinUI, and Blazor all seem to be commercially irrelevant as far as I can tell. Would love to hear evidence to the contrary though.
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XAML (WPF, UWP, WINxUI) does not appear to be going away. Pick a flavor and a device. Desktop, mobile, Xbox, all of the above, etc. Then use the corresponding (Visual Studio) project type(s).
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Not at all what I'm asking.
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I think you need to define "big commercial" better, are you talking twatter, FB, and the host of social media or large corporates, banks, insurance etc?
Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP
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Has anyone here used RIBs architecture before? I’m starting a new cross platform mobile project using it. I’m trying to figure out:
- For Android whether to use Kotlin or Java,
- For iOS whether to use SwiftUI or UIKit
- What good dependency injection practices using needle and RIBs are? Does needle replace RxSwift?
- How and where to properly use “Plugins” on a more practical level than this article gives
- How to write unit tests for the interactor. Unfortunately I have almost no experience writing unit tests in Java/Kotlin & Swift but I really want to learn.
Thank you for reading this and I greatly appreciate any assistance.
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in a video game you have a ton of different objects, they usually fall into categories: walls, characters/units, buildings, resource type objects (crystals, gold mines etc). the categories behave very differently. My question is how do you keep it all organized? I only have two types of objects and it`s a mess already, and I need to add another type or two. I have been keeping a separate list for each type of object, the exchange of information between types tends to be messy and that will just increase if I add new types.
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Without knowing all the details of your problem, it seems like a case where object inheritance can help. Your objects can inherit from a base class, let’s say “entity” and reimplement various polymorphic functions.
For instance, each can have a collide function that does different things depending on the specific type of object. On the other hand, all objects have a location on the game map so you might have a function Entity::location() that returns the position of an object without having to reimplement it.
Also, your hierarchy might become more complicated as you find common traits between various classes of objects. You might have FixedEntity that describes walls and other things that stay put, and MobileEntity for players, dragons and what not.
Mircea
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All my objects are the same "game block"; with a "type code".
Each type loads a different "image" (with a transparent background) so they all look different.
The "game block" can rotate, reverse, fire, etc.; except that certain interactions are disabled depending on the type of block currently selected / active (e.g. the "scout" doesn't have fire power which is handled by giving him "zero" range).
I thought of deriving from one "base class", but in the end didn't find it necessary; just the occasional switch statement here and there.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Quote: All my objects are the same "game block"
I think I`ve seen that before somewhere. There`s two ways to code what you`re saying. You either have a single class or a struct for all types of objects, in which case you need a field/variable to hold your 'type code' or you can use inheritance in which case each type of object is a class derived from a common base class.
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The problem with using switch statements to control behavior is this: when you want to add a new type of block, you have to hunt down every switch statement that requires a new case label. That's why using virtual methods is preferable. You just invoke the virtual method, and each different type of block provides the code that would otherwise have gone with a case label.
It can sometimes be hard to define the interface for a virtual method. For those situations, you can invoke a virtual type method that returns a block's type, which you can then use in a switch statement after all. But if you find yourself doing this often, it can mean that your methods are too big and should be broken into smaller pieces that would make it easier to delegate most of what they do to virtual methods instead.
It's annoying to have to define a virtual method and override it in all the necessary places. The "code it now!" approach is to just write a switch statement. But in a large program, the time needed to add virtual methods will be more than recovered because the resulting code will be easier to maintain and evolve.
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I almost never use switch - case approach to logical gates (good old if is always there to help)
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You're generalizing about switch without knowing the details.
A switch could be implemented via a Dictionary ... Is that more "acceptable"?
(In fact, the "game" is primarily driven via dictionary "tables")
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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If it didn't mean a switch statement, I think you can see how it was misleading.
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On a second thought I think I know why this is important. It has to do with events. Making all the classes have a common base type is just half of the problem, all the derived classes end up with loose ends and you need to call(trigger) events in each of them. So that`s the second half of the problem. Thanks for bringing that into attention.
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That's already been said: inheritance.
Choosing a single "game block" versus 20 or 30 (current) subclasses was an easy choice when you don't "personalize" the game pieces.
Even an "asset" is simply a game block that doesn't move (even if the potential is there).
Where subclassing is useful is when you have a team; and everyone is working on a "character" (versus a set of pieces).
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Quote: when you don't "personalize" the game pieces
I think I`ve seen something similar somewhere.
Quote: That's already been said: inheritance
I`m curious to know, c++ hasn`t been around since forever, how was this problem dealt with in the C days?
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I used to work in a proprietary language (designed ~1976) that could perhaps be described as Modula (Pascal successor) meets a stripped down Ada. Before it was extended with object-oriented features (~1993), there were parts of our system that were OO-like, done manually.
First, there was the concept of an area: a data structure whose "base class" had to set its fixed size in bytes, but which could then be refined by "subclasses" that added their own data after the fields defined by the base class.
Second, we made extensive use of function pointers, which were sometimes grouped into some struct whose functions could then be "inherited" and "overridden" manually. These structs of function pointers were often registered in an array that was indexed by a type identifier, so you would see code like polymorphs[type].function(...).
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I hacked Ultima XX way back when: it was all tables. I find that even with OOP, tables (dictionaries) have their place. VB 6 was component based; sort of like dependency injection; a pattern often overlooked.
For my game blocks that have a "line of sight", I inject (attach) a line of sight control that can show in the UI.
Tables, components and (yes) I have some "adapters" that are descended from a base class, including virtual methods (different historical versions of various tables); so, it all "depends" and reworking is part of the path as the "mental model" evolves.
P.S.
You also need to think about the best / easiest way to save the whole "game state" and restore it at some point. Then we get into "programming" scenarios / map points, etc.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
modified 8-Aug-22 13:50pm.
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Gerry Schmitz wrote: I hacked Ultima XX way back when: it was all tables. I find that even with OOP, tables (dictionaries) have their place.
In my student days as a TA in the introductory programming course, half of the University departments insisted on sticking to Fortran ("we are doing engineering!!"), the other half had modernized to Pascal. Except for the language, the subjects taught was the same - except for one hand-in: In the Pascal group, the problem required the use of a linked list.
There was this (very cute) female chemistry student - her department insisted on Fortran - who got a little crossed: Why can't we learn the same stuff as they do in those other departments? So I explained that Fortran had no pointer mechanism, where one variable would tell where another value was located. She got very curious, so I had to go into more details of the mechanism, with a heap that could be seen as a huge array, and a pointer serving as an index into it. (They had been working a lot with arrays at this time.)
One week later this girl was back: She had gotten hold of the Pascal exercise, and solved it in Fortran in the way I had explained, with an array and using another variable as an index into the array. The solution gave the expected result, but she would be happy if I could take a look at it to see if she had done it the right way ...
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Calin Cali wrote: I`m curious to know, c++ hasn`t been around since forever, how was this problem dealt with in the C days?
Even the original 1970 Pascal provided a simple polymorphism, through "variant records".
In my first university level programming class, in 1977, the professor made some requirements not mandated by the language:
All data shall be put into Pascal RECORD variables - or class instances, if you like - representing a set of related property values.
All functions/procedures shall take a RECORD instance as its first parameter (although the formal parameter could be named anything descriptive, not just 'this').
Functions/procedures taking a RECORD type R as its first parameter shall be the only ones to modify an R record, and only the instance supplied as first parameter.
The RECORD type declaration shall be followed by all the functions/procedures taking this record type as first parameter.
If one object type is a special case of another one, embed the general RECORD type as the first field in the larger RECORD. For simpler subtype cases, we could use the variant record mechanism.
When C++ arrived 8 years later, we changed 'RECORD' to 'class', moved the closing brace down to after the function declarations, changed 'operation(object, ...' to 'object.operation(...' and changed uses 'object.field' to 'this.field' (or only 'field'). Where subclassing and inheritance was used, the first field type name was moved to a parent class reference in the class definition and the name of the parent class field deleted (e.g. from MyBus.Vehicle.Numberplate to MyBus.Numberplate.) There really wasn't that much change in the programming style, mostly rather minor syntax adjustments.
Obviously, our OO style of plain Pascal programming didn't provide all the mechanisms of today's C++ (nor did the first C++!). No abstract classes, no overloading, ... But we did have multiple inheritance! 
(Another but not OO-related requirement this professor made: In any function / routine / method parameter list, the read only input parameters come first, out parameters and references that are modified comes last. To this day, when I see code breaking this rule, I find it terribly confusing and want to edit the order, regardless of who owns the code!)
We never called it 'object oriented' in those days. Nor did those programming the first OS I had source code access to, programmed in a near-assembler-level language in the early 1970s. I saw it after I had learnt C++, and recognized the sub/superclass structures, abstract classes, virtual functions ... except that it was laid out 'by hand' in memory word by word, and the function pointer tables was addressed 'by hand' as the C++ compiler would have done it. When I presented my academic view on it, the old developers shrugged: Well, but this isn't high level language.
In other words: C++ certainly did not invent OO - it just was the first successful attempt to give OO a widely accepted language syntax. (Simula 67 and Smalltalk 72 was less long-term successful in the marketplace.)
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There are a few ways to organize everything on your screen. One way is to use the built-in organizational tools that your operating system provides. For example, on a Mac you can use Spaces to create different "areas" on your screen to keep things separate.
Another way to organize your screen is to use third-party apps. There are a number of these available, and they can be very helpful in keeping your screen organized and tidy.
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Going by your question, "My question is how do you keep it all organized?":
Organization should start with what is most important.
Then to what is next important.
And so on.
That is it. All that answers your question about organization.
For this to work:
Make each of these work. Include error checking to each before moving to the next. Test them each before moving on to the next.
Use switch or if then or whatever code is easiest for you (your personal self) to use and follow later.
It is not so complicated. Just do as I said, one at a time. Take your time. Do not get into a hurry. Do not take short-cuts. Make *your* code readable to *you*.
If you write most of it with simple if-then-else and if that is most comfortable to you, then that is how it should be coded.
Thank you for asking.
Here is an example.
If you have a character moving in a scene with walls and background, then this all has to be rendered to some output.
Remember this is just an example.
First create or load or put together the background.
Then effects to the background, like lightning or explosions.
Then the walls.
Then effects to the walls like splatter eminating from bullet hits etc.
Then the stationary items in the space like blocks or resources etc. which are upstaging the character.
Then effects to those stationary items.
Then movable items or characters that are upstaging the character.
Then effects to those particular movable items.
Then the character.
Then effects to that particular character.
Then do similar to that which is down stage of the character.
Upstage is further away from you than the character. Downstage is closer to you than the character.
Now that I have answered your question as it was asked, I feel like I might now get into other things. The following might be tangental to the question, but I at least answered the question first.
If you are doing this in Microsoft Windows and if you are blitting the images (still or virtually moving), then you might want to use 2 or three or many more buffers, blitting to each buffer as you go from the furtherest away from you to the buffer that is closest to you. Put all of these together and blit to the screen buffer. Then put the screen buffer to the screen.
If you have 5 buffers and the background is buffer_5 then when you have buffer_4 complete, add buffer_4 to buffer_5 and save it as buffer_4. This can be done by starting buffer_4 as a solid color (example RGB 255,0,0 which is Red) and bit block transfering images to it that are like custom cutouts pasted to construction paper. Then blitt that buffer_4 onto bufer_5 with the red area being transparent and save this as buffer_5. Do this until you get to buffer_1 and then blitt that to the screen buffer.
Do not compost to the screen buffer. Just blit a completed buffer to it.
Hope that helps.
Just an example.
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I have a desktop app that consumes a Google API. Right now the Client Id and Secret are defined as constant strings in plain text and built into the app.I'd like to secure them with encryption, but then I would have to store the key somewhere, which doesn't solve the problem.
What's the best way to secure the Id and Secret?
Thanks
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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