web services fundamentals

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gdv - 14 Oct 2007 17:32 GMT

I am trying to understand web services.
what i understood so far is that web service is nothing but like a
java program sitting and running on the client side to access
application from the server side. so if there are 10 clients each will
have one web service ( total 10 web services). so what happens when
all 10 clients make a call to web service at the same time?

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Arne Vajhøj - 14 Oct 2007 18:43 GMT

> I am trying to understand web services.
> what i understood so far is that web service is nothing but like a
> java program sitting and running on the client side to access
> application from the server side. so if there are 10 clients each will
> have one web service ( total 10 web services). so what happens when
> all 10 clients make a call to web service at the same time?

A web service is a service provided by a server to clients using
web technology (typical SOAP over HTTP).

In theory a server could process the request from each client
sequentially.

Web services in the Java world are usually hosted in a servlet
container and those are usually multi threaded and capable
of serving multiple requests in parallel.

Arne

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gdv - 14 Oct 2007 18:53 GMT

Thanks Arne.
just want to make sure that server's servlet containers (like tomcat)
contains the code for web service.
so server ( service provider ) will have application code and web
service code. How do client find out where is the service and how to
make a connection with the provider's web service?

On Oct 14, 1:43 pm, Arne Vajh?j <a...@vajhoej.dk> wrote:

> > I am trying to understand web services.
> > what i understood so far is that web service is nothing but like a
[quoted text clipped - 14 lines]
>
> Arne

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Lew - 14 Oct 2007 19:02 GMT

> Thanks Arne.

Please do not top-post. Read the "mini-FAQ" message in this newsgroup, and
the articles to which it links.

> just want to make sure that server's servlet containers (like tomcat)
> contains the code for web service.

It will if you write that code and deploy it to the app server.

> so server ( service provider ) will have application code and web
> service code. How do client find out where is the service and how to
> make a connection with the provider's web service?

Google for "UDDI" and "WSDL". One way or another the client will need to
discover a URL, and send a message that conforms to the service's requirements.

Sun has material on writing web services in its tutorials. Java SE 6 and EE 5
have enhanced support for web-service development.

Signature

Lew

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Arne Vajhøj - 14 Oct 2007 19:17 GMT

> just want to make sure that server's servlet containers (like tomcat)
> contains the code for web service.

If somebody deployed it then it will be there.

> so server ( service provider ) will have application code and web
> service code. How do client find out where is the service and how to
> make a connection with the provider's web service?

The web service client connects to a specific URL.

It can be handcoded or it can use a stub generated from
the WSDL.

Arne

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web services fundamentals

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