Design and Architecture

8-Sep-13 8:37

theitmueller wrote:
used in the development environment

What does "development environment" mean exactly?

Are you running this is Visual Studio? Or are you building and then deploying to another box?

Are the dlls all linked statically or are you loading some/all dynamically? If the latter then you MUST have validation code which, at a minimum should provide error output that tells you where it is looking for them?

theitmueller wrote:
Would you support a solution with just one single folder for all DLL in the whole project

I have a folder with folders under it for each library. That is because some libraries consist of more than one dll.

Additionally you might look out for libraries that rely on other libraries. So your VS project contains libA but that requires libB and your project does not have libB in it (and libB isn't a normal library on the system.)

Questions Regarding OOPs

userBeginner27-Aug-13 4:14

userBeginner

27-Aug-13 4:14

SQL

I want to ask some questions related to OOP,I have read many articles but still confused. Kindly provide description instead of any Link.

1). What is the purpose of Inheritance?Why using Inheritance?
2). What is the purpose of Abstraction?
3). What is the purpose of Abstraction?
4). What is design pattern? Why using design pattern?

http://en.wikipedia.org/wiki/Inheritance_(object-oriented_programming)[^]
http://en.wikipedia.org/wiki/Abstraction_(computer_science)[^]
http://en.wikipedia.org/wiki/Design_Patterns[^]

NotPolitcallyCorrect27-Aug-13 4:41

NotPolitcallyCorrect

27-Aug-13 4:41

Richard MacCutchan27-Aug-13 4:51

Richard MacCutchan

27-Aug-13 4:51

Please do not crosspost, you already posted this question at Questions Regarding OOPs[^].

Veni, vidi, abiit domum

BotCar27-Aug-13 21:19

BotCar

27-Aug-13 21:19

Blame me for that one. I suggested he post it here instead.

What is this talk of release? I do not release software. My software escapes leaving a bloody trail of designers and quality assurance people in its wake.

Richard MacCutchan27-Aug-13 21:50

Richard MacCutchan

27-Aug-13 21:50

BotCar wrote:
I suggested he post it here instead.

Why, It's a perfectly reasonable Q&A post?

Veni, vidi, abiit domum

BotCar27-Aug-13 21:58

BotCar

27-Aug-13 21:58

It seemed like more of a discussion type of question that would fit better in a forum than on Q&A. I guess I was wrong.

What is this talk of release? I do not release software. My software escapes leaving a bloody trail of designers and quality assurance people in its wake.

webservices architectures

Albert Holguin8-Oct-13 7:46

Albert Holguin

8-Oct-13 7:46

I think you do have a point there (as to it being a discussion point) but alas, that question sounds a lot like someone's Computer Science 101 homework question.

topcatalpha26-Aug-13 3:53

topcatalpha

26-Aug-13 3:53

Hi,

i'm looking for some good articles about webservices. (if possible for dotnet c#)

More particular :
- Security
- How to maintain / support several client versions.
- how to handle large projects. (e.g. multiple services ? how do they work togheter ?)

All information is welcome.

Thx,

Kurt

Re: webservices architectures

Richard MacCutchan26-Aug-13 4:11

Richard MacCutchan

26-Aug-13 4:11

There is Google, and there is the CodeProject articles section, both of which have lots to offer.

Veni, vidi, abiit domum

Don't want the DAL layer to be referenced in the UI or UT layer

benndonwload23-Aug-13 5:01

benndonwload

23-Aug-13 5:01

Hi,

I am trying to have my project divided in layers. Here is how it's set so far:

- DAL layer: communicate with the database
- Services Layer: cummunicate with the DAL and the UI/UT layers
- UI Layer: is an MVC4 web application
- UT layer: Unit Test project
- Common Layer: has some common classes sheared accross the solution, it has actually the Enum classes.

In my DAL layer, I have:

RepositoryBase<T>: IDisposable where T: class, new()

this class has CRUD methods and some others like GetAll(), Filter and so on.

public IEnumerable<T> GetAll()

In my Services layer, which has a reference to the DAL layer, I have, lets say:

ProductManager: RepositoryBase<CT_Product>.

CT_Product is an EF5 entity
It override the DAL GetAll() method and return an IList of Product, Product is a class in my Model.

public IList<Product> GetAll()

Here is my problem: in my UI layer or even the UT layer I don't want to add reference of my DAL layer, I want to only deel with Services layer but when I try to call the Services GetAll() methode I am getting an error which I resolve by adding the DAL layer and I don't like that. Mad | :mad:

Can someone help by pointing me on how to get that?
Benn

Re: Don't want the DAL layer to be referenced in the UI or UT layer

benndonwload23-Aug-13 11:27

benndonwload

23-Aug-13 11:27

Hi,

I've found a workaround. Here is what I did in the ProductManager class.

I have added a private property like this:

private RepositoryBase<CH_Product> repo;

and instantiate it in the constructor

XML

#region Constructor
public ProductManager()
{
    repo = new RepositoryBase<CH_Product>();
}
#endregion

Here is the GetAll() method

XML

public IList<Product> GetAll()
{
    IEnumerable<CH_Product> dalEntList = repo.GetAll();

    IList<Product> PrdList = new List<Product>();
    Mapping.Mapper.Map(dalEntList,out  PrdList);

    return PrdList;
}

Now, the UT or UI layer will not reference the DAL layer.

The disadvantage is that, if I want to use the other RepositoryBase methods, I will have to write them all like the getAll method.

Is there any other solution?
Thanks again.
Benn

Re: Don't want the DAL layer to be referenced in the UI or UT layer

jschell23-Aug-13 13:30

Re: Don't want the DAL layer to be referenced in the UI or UT layer

23-Aug-13 13:30

benndonwload wrote:
I don't want to add reference of my DAL layer

Meaning what exactly? As in a Visual Studio reference? Sorry then you are out of luck.

You have to tie it together somehow and either the business service layer does it or you have to provide another layer that ties them together, for instance by passing factories, interfaces, etc.

Or you use dynamic loading in the service layer.

However without other information I wouldn't suggest doing either. One reason for it would be if you have a truly enormous project, for example with hundreds of tables.

benndonwload23-Aug-13 18:06

benndonwload

23-Aug-13 18:06

Hi,

By adding reference, I mean adding a reference to a project (dll) in visual studio by doing a right click on Reference and Add.

What kind of information do you need?

Regards
Benn

Re: Don't want the DAL layer to be referenced in the UI or UT layer

jschell26-Aug-13 8:55

Moving Data within an Application

26-Aug-13 8:55

benndonwload wrote:
What kind of information do you need?

As I said - the only reason for choosing an alternative would be due to enormous complexity. For example if you had hundreds (plural not singular) of tables (tables not attributes) in your data layer.

modified 30-Aug-13 20:39pm.

AeroClassics12-Aug-13 12:05

AeroClassics

12-Aug-13 12:05

I am in the process of creating a communications server for an application we are building. Pretty standard architecture, multi-threaded, server waits for connection from remote and starts thread to handle data transfer to and from. Not difficult and lots of examples out here. But what is rarely discussed, maybe because it is application specific, is how data is move from the read callback to the object that needs the data. I prefer to keep the functionality compartmentalized.

I have done the queue with a event/delegate implementation. That's fine if all the clients data ends up in one place for processing. But what if an object needs to be paired with a comm handler object? Use an interface? Move the business logic into the handler? That defeats the idea that this should be generic enough to be used in other projects.

All thoughts and suggestions are welcomed!

Thanks,
Doug

I am a Traveler
of both Time and Space

jschell13-Aug-13 8:55

13-Aug-13 8:55

AeroClassics wrote:
All thoughts and suggestions are welcomed!

Attempting to generalize from one case based on hypotheticals is seldom a good idea. The outcome is often code that is never used, overly complex, more fragile (due to complexity) and can even result in more cost when a real case arrives which is totally incompatible.

AeroClassics14-Aug-13 5:12

AeroClassics

14-Aug-13 5:12

JSchell,
I see your point. Solving a specific type of problem this way can lead to overly complex code on some ocassions. However, this is really a specific problem that I tried to explain in a way that required the fewest words in an effort to avoid confusion.

This problem I have solved a couple of different ways and I am faced with it again. I was not completely happy with my other solutions. Having spent the majority of my career working in the Unix/Linux world these things are done differently. While I have written a lot of desktop code in the MS environment I find that I am trying to apply a Unix mindset to Windows desktop problems. I am not sure this is the best way!

So the problem remains. Regardless of where the data stream originates (pipe, TCP/IP etc) waiting for a connection and spinning off a thread to handle that communication channel is the easy part. What I find a bit more difficult to find a decent generic solution for. I am beginning to lean toward using an abstract class or an interface to put the burden on the user of the server object. This is just passing the buck so to speak. Unfortunately I also have to use this object!

This lead to the original question. What do most folks do when they need to move data from one object to another? I realize that you can just invoke a method in another object if you have a reference but that, in my personal opinion, is wrong. The server object should not know about the consumer of the data he should just make it available. Typically I toss the data into a queue and invoke an exposed event. But perhaps there is a better way?

Doug

I am a Traveler
of both Time and Space

jschell15-Aug-13 8:55

15-Aug-13 8:55

AeroClassics wrote:
I realize that you can just invoke a method in another object if you have a
reference but that, in my personal opinion, is wrong.

As a general statement - your conclusion is specifically wrong. Basically it condemns OO entirely as well as ignoring the historical concept of RPC and the problems with that when people decided that fine grained objects were the only way to go. (Early adopters of Java RMI experienced the same problem and that includes earlier JEE containers.)

AeroClassics wrote:
But perhaps there is a better way?

If I have a specific architecture or business need for a message queuing system then I use one. I don't use it just as a whim however because of the complexity involved.

Eddy Vluggen14-Aug-13 6:03

Eddy Vluggen

14-Aug-13 6:03

AeroClassics wrote:
That's fine if all the clients data ends up in one place for processing. But what if an object needs to be paired with a comm handler object?

Create a dictonary, pair the socket with the object that's about to handle the data Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]