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From Aleksander Slominski <as...@cs.indiana.edu>
Subject REQ: modular, small footprint, client side only SOAP Java impl? [Re: Apache.WebServices.Next?]
Date Thu, 30 Oct 2003 15:42:47 GMT
hi,

replying to Dims' "Apache.WebServices.Next" post i would like to look on 
more fundamental question concerning Apache WS modularity: i am 
interested to find out if there is any interest in very modular, low 
footprint, Java SOAP implementation that is based around XML Infoset 
object model with XPath support.

in AXIS requirements (http://ws.apache.org/axis/java/requirements.html) 
there is identified need for "*A single SUPER TINY .jar file must be 
enough for a client to communicate via SOAP*" but based on my recent 
(and limited!) experience with extracting functionality from AXIS this 
is very very difficult to do due to monolithic source tree (i do not 
mind to be proven wrong!).

i also think that on client side what is really required is just HTTP 
and doc/literal support, in other words to allow direct manipulation of 
XML, and there is no real need for sophisticated 
serialization/deserialization infrastructure.

i am very interested to learn about open source Java SOAP 
implementations that are in such space (modular, small footprint, client 
side only SOAP Java).

as proof of concept i have built Web XML Services Utility Library that 
currently has following modules:
* common (no dependencies except for XML pull parsing API - currently 
uses XPP3/XB1 for XML Infoset API)
* http_client (depends on common)
- provides basic HTTP 1.x client side support with simple HTTP 
connection manager
* http_server (depends on common)
- provide basic HTTP 1.x server side support with simplified 
Servlet-like API
* invoker (depends on http_client)
- allows simple invocation of service by sending XML on top of HTTP
* processor (depends on http_server)
- provides basic support for processing incoming XML over HTTP
* dsig_globus (depends on common and security jar file from lib/dsig*)
- provides XML digital signature and limited WS SEC support using Globus 
Toolkit 3 grid proxy certificates
(later: SOAP 1.1 Section 4 encoding (de)serialization support, small 
footprint WSDL, dynamic invocations using WSDL, WS-RM, and other modules)

client footprint for common + http_client + invoker is currently 40K jar 
(+ 70K for XPP3).

the previous version of this client side library is used in Xydra - An 
automatic form generator for Web Services 
(http://www.extreme.indiana.edu/xgws/xydra/) and was tested for last few 
months so i am thinking about releasing it if there is enough interest. 
to give you idea how it works here is small code snippet (interfaces 
XmlElement, XmlDocument directly model XML Infoset Element and Document 
Information Items and are implemented by XPP3/XB1):

//construct XML
XmlPullBuilder builder = XmlPullBuilder.newInstance();
XmlElement request = builder.parseFragmentFromReader(
new StringReader("<getNode><path>hello</path></getNode>"));
// create XML service invoker
HttpDynamicInfosetInvoker invoker = new HttpDynamicInfosetInvoker();
invoker.setLocation("http://localhost:"+port);
// do actual invocation by wrapping message in SOAP 1.1 Envelope and 
sending it over HTTP
XmlDocument response = invoker.invokeSoap11(request);
String r = builder.serializeToString(response);
System.out.println("got back "+r);

so let me know about other open source Java SOAP implementations that 
are very modular and/or have good client side and i would like to hear 
if there is need for such library (i noticed some interest in axis-dev 
mailing list archives but i could not find any references to open source 
toolkit only mentioned were GLUE and Wingfoot both not under Apache-like 
licenses).

thanks,

alek

Davanum Srinivas wrote:

>Folks,
>
>Please review the latest proposals that we are working on. We can have a VOTE next week
to start
>the ball rolling for the following. As usual, feel free to sign up for anything you are
interested
>in.
>
>#1: WS-FX - umbrella for WS-* specification implementation
>#2: WSS4J - WS-Security Implementation under WS-FX
>#3: SANDESHA - WS-Reliability Implementation under WS-FX
>
>URL:
>http://nagoya.apache.org/wiki/apachewiki.cgi?WebServicesProjectPages/WebServicesProjectProposals
>
>Thanks,
>dims
>
>=====
>Davanum Srinivas - http://webservices.apache.org/~dims/
>  
>


-- 
If everything seems under control, you're just not going fast enough. —Mario Andretti



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