Re: Web Services/SOA
- From: "Mr. Arnold" <MR. Arnold@xxxxxxxxxx>
- Date: Fri, 6 Jun 2008 18:22:13 -0400
"Marco Pais" <marco.pais[at]gmail.com> wrote in message news:%23D2rvY7xIHA.4896@xxxxxxxxxxxxxxxxxxxxxxx
Hello.
This post is long, but I think that's a pertinent question for many people.
I built a client/server application using .NET and SQL server, a 2 tier application. This first version was built in a rush, so its architecture is not well designed for the company growth.
Some weeks ago, I decided to separate the data from the presentation tier and include the so named Business Logic Layer. This is a pretty name. and I can understand pretty well its value. My goal is to facilitate the change of processes, with transparency to the client. This is one of the interpretations of SOA.
<http://www.google.com/search?hl=en&pwst=1&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=books+on+soa+architecture&spell=1>
You need to find a good book to start with and understand the concepts of SOA.
You need to think about this very carefully, as I just came off of a SOA WCF solution that was a total nightmare that was not transparent to the client and didn't allow for new clients being implemented and using the SOA solution easily with growth. The solution was not thought out well, a total nightmare to maintain or implement new enhancements -- a total nightmare, and it showed what not to do.
What did I use for this layer? Web Services. This WS access database through the call of Stored Procedures. My headaches started here. Is this a good solution?
Well, you can have problems in getting that data to/from the UI/Bus/WS/Data access tiers, and again you need to think about how you're going to do this. You might want to look at something like nHibernate or other such tools to faciliate data acess and/or with native calls to SQL server too. And you can still use Strored Procedures with both solutions.
I read and I'm still reading several points of view. the are a lot of opinions J
Java was here first, which has many books on SOA that can be applied to .Net too as a starting point on how to do things, along with .Net books as well. You need to find some good books that will give you a good concept.
Concerning the technology used, I am also very confused. This company has several connected processes. So I built a single class in a WS with several methods (business services), so those processes can connect through the use of those services/methods.
What's stopping you from having more than one WEb service? The Web service should only be the means of sending data between the BUS and DAL tiers to begin with by the use of serialised objects between the tiers.
For instance I have a CAR. There's a method to get car data from database, and another one to update car data. Two methods. You will say: use a CAR OBJECT with appropriate methods. That's were I have some doubts. I can only have one class in a web service, right? At least, that's what WS config says:
You use serialized XML objects, which can be in a binary format -- serialize/deserialize objects. The objects contain their on properties and methods that will be acted upon.
<%@ WebService Language="C#" CodeBehind="~/App_Code/Service.cs" Class="Service" %>
What are the best practices? Where can I find better resources for this kind of development?
Look above and use Google. You'll find the books.
I also would suggest looking into MVP. You should think interfaces, and the UI should be unaware of the bussiness layer - a loosly coupled solution, which allows for easy testing, implementation and growth of the solution. You can use a test harness and you test against the interfaces.
MODEL-VIEW-PRESENTER
http://www.polymorphicpodcast.com/
click 'Shows'
click 'Design Patterns Bootcamp: Model View * Patterns*
view parts 1-5
You can use Google to get more information about this or find books.
You may want to get the book, download the CSLA framework code, and download the project code that uses the CSLA framework to get concepts. It's got all that you're looking for to learn on the howto(s) in many areas. As a matter of fact, I came off a WS SOA project that used CSLA which is free to implement in a company. You just can't develop a solution using CSLA as sale the solution using CSLA.
http://www.lhotka.net/
.
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- From: Marco Pais
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