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From "Sergey Beryozkin" <>
Subject Re: passing objects by reference in SOAP - How would it work?
Date Tue, 17 Jun 2003 12:09:20 GMT
I thought it was a different list :-), so my response was probably out of context, apologies
  ----- Original Message ----- 
  From: Sergey Beryozkin 
  Sent: Tuesday, June 17, 2003 1:04 PM
  Subject: Re: passing objects by reference in SOAP - How would it work?

  In most cases you don't want to do the same in SOAP. Often, a good approach is to create
a simple wrapper application which will handle internally all the session-oriented staff.

  With WSDL 1.2 you can GET a session first and then POST to it
  Sergey Beryozkin 
    ----- Original Message ----- 
    From: Agarwal, Naresh 
    Sent: Tuesday, June 17, 2003 12:56 PM
    Subject: passing objects by reference in SOAP - How would it work?


    A typical SDK is object-oriented and involves passing objects/data by
    references (pointers). This will work as long as the client using the SDK is
    in the same address space of the SDK. However, if client and SDK (i.e., the
    service which provides SDK functions) are in different address spaces, then
    this will not work "AS IS", and we need some kind of
    marshalling/demarshalling mechanism used in DCOM and CORBA etc.

    How does such a thing will work in SOAP given the fact that SOAP does NOT
    support passing objects by reference?

    Consider the example of a typical SDK given below:

    Z, A, B, C, D and E are some classes. a, b, c, d and e are instances of A,
    B, C, D, E respectively. Classes Z, A, B, C, D and E have various functions,
    which could be used for various purposes. consider the code below, which
    shows how to use a function "getE" of class E.


    A a = Z.getA(some parameters - p1) // getA is static function

    B b = a.getB(some parameters - p2)

    C c = b.getC(some parameters - p3)

    D d = c.getD(some parameters - p4)

    E e = d.getE(some parameters - p5)


    Now if I wish to expose such a SDK as a WebService, then I cann't do this
    "as is" because SOAP does not support passing objects by references. Thus, I
    cannot expose "getA" function as WebService, as it returns instance of class
    A, which inturn has functions (executed at service side), which return other
    objects (like b)

    Thus AFAIK, the only way out is to expose a single function "getE", which in
    turn will do all the stuff, i.e.,

    getE(p1, p2, p3, p4, p5) {

    A a = Z.getA(p1) // getA is static function

    B b = a.getB(p2)

    C c = b.getC( p3)

    D d = c.getD(p4)

    E e = d.getE(p5)

    return e;


    Is there a better way out? Or this is the only way to expose such existing
    SDKs as Web Services?

    thanks & regards,

    Naresh Agarwal

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