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WebServices Interoperability Computers Articles | May 5 Wholesale NCAA Shirts , 2005

Interoperability is one of the main promises of Web services. Web services are designed to be independent of the underlying operating system and programming language. In this article we will address some basic web services interoperability issues that are useful for developers. We will focus on the two most popular platforms - Java and Microsoft C#.



Introduction


More and more we're finding that WSDL lies at the heart of Web services interoperability. WSDL is the description language for Web services. Usually a WSDL document is automatically generated by Web services framework tools (e.g., Axis, WASP WSDLCompiler) from the code written in a particular programming language. Developers can use the WSDL document to generate client-side stubs or proxies Wholesale NCAA Jerseys , which provide convenient access to Web services. Thus the key to enabling seamless Web services interoperability is the ability of one Web services framework to consume the WSDL documents generated by other frameworks. The WSDL interoperability effort is just taking off. You can see further details at http:soap.systinet.netinteropwsdlindex.


How to not get trapped


The following subchapters give you some basic tips on how to write interoperable Web services using today's Web services frameworks. These tips may significantly ease your life as well as the lives of other developers who will use your Web services. Hopefully some of those tips will be outdated soon.


Keep your types simple - avoid advanced XML Schema constructs


The XML Schema standard is very complex and difficult to implement. Moreover, XML Schema processing is quite time consuming, so many frameworks sacrifice full XML Schema support for performance. Some advanced XML Schema constructs (e.g. Wholesale Hats , choice) are quite hard to express in a programming language, and few Web services frameworks support them. So the key success factor in Web services interoperability is to use basic data types, such as primitive data types Wholesale Hoodies , arrays, and structures. As a best practice, decompose the complex types in your interfaces into simple and clean interfaces with basic data types. Also avoid using specific techniques (e.g. INOUT parameter passing) that aren't widely supported.


Sample Architecture
Let we see the architecture of my sample application which uses web services along with messaging concepts.




Here 3 web services are used. Two web services Wholesale Shirts , Place Order and Get Order are developed and deployed in Java environment and another one, Send Message is in C# environment.


The Ordering System calls the Place Order web service to place an item to order. The Place Order web service stores that item and notifies the Java Expeditor Client through JMS. After the intimation message has come from JMS the Java Expeditor Client calls the Get Order web service to retrieve the ordered items and details. The same Place Order web service calls the another web service, Send Message to send the message to MSMQ Wholesale Jerseys , then the Notification message is sent to the C# Expeditor Client from MSMQ. After the intimation message has come from MSMQ, the C# Expeditor Client calls the Get Order web service to retrieve the ordered items and details.
Here functionality of the Java Expeditor and C# Expeditor Client are same except that they are developed in different platform to illustrate the interoperability of web services. So here its proved that web service Get Order, which is developed and deployed in Java environment is accessed from the C# Expeditor client and the web service Send Message Cheap NCAA Hats Online , which is developed and deployed in C# environment is accessed from Place Order web service of Java environment.


Accessing Java Web Service from C#


To invoke the Get Order web service in C# Expeditor Client application, we are going to Add Web Reference to the Get Order web service. The steps to be followed to do this are,

In Project menu Cheap NCAA Hoodies Online , click Add Web Reference? In the URL box type http:localhost:8888axisservletAxisServlet (or u can give the web service URL) Now it will show the list of services that are available. From that select Get Order (wsdl) link. Click Add Reference button.

We need to create a proxy client to access this web reference. For that we need the wsdl file of that particular web service.


Save WSDL file
The AxisServlet generates the wsdl file for the web service. To get the wsdl for Get Order Web service,
Type this URL in browser: http:localhost:8888axisservletAxisServlet.
Click on wsdl link belongs to Get Order Web service.
It will display the wsdl xml content. Save this content with .wsdl extension.


Create Proxy Client
For the creation of proxy client we can utilize the wsdl tool of Microsoft Visual Studio.
Now, open the Command Prompt (preferably the Visual Studio.NET Command Prompt Cheap NCAA Shirts Online , which verifies the PATH environmental parameters are set correctly). Navigate to the directory containing the GetOrder.wsdl file. Type the following at the command prompt:
wsdl o:GetOrderService.cs GetOrder.wsdl
Now the GetOrderService.cs file will be created. This is the proxy class for the referenced web service. So, add this file into the assembly of your C# project. By making instance to this proxy client we can call the Get Order Web service as the following code,



GetOrderService GOService = new GetOrderService ();
string strOrders;
strOrders = GOService.getOrder ();


Accessing .Net Web Service from Java
For accessing the .Net web service we can use the org.apache.soap package and it sub package rpc. We need to provide the Service URL Cheap NCAA Jerseys Online , Target namespace and the Soap Action which is present in the wsdl file. By using the Call class we can invoke the Web service method as i It might be conceivable to shed 10 . Wholesale Nike Shoes Online Wholesale Mens Air Jordan Wholesale Air Max 90 Wholesale Nike Shoes China Cheap Air Jordan Cheap Nike Shoes Clearance Cheap Air Max Shoes Wholesale Air Max Shoes Wholesale Nike Air Max Shoes Wholesale Nike Shoes Free Shipping
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