Clarifications on OSGI URL scheme support for JNDI

[bjhargrave]

Original bug ID: BZ#185
From: Nipuni Perera <nipuni880917@gmail.com>
Reported version: R6

[bjhargrave]

Comment author: Nipuni Perera <nipuni880917@gmail.com>

Hi all,

I am trying to implement OSGI URL scheme support for JNDI following the OSGI service specification[1]. While implementing the OSGI URL scheme I encountered following issues.
As per the specification, Following are the confusions I have:

1. A lookup with osgi:service path will return a service while a servicelist path returns an context object. Does a query "osgi:servicelist/" is valid? Or is it mandatory to have a query followed by the osgi:servicelist/ ?

2. As per the specification, listBindings() and list() methods will return NamingEnumeration objects. Do both "service" and "servicelist" paths need to support aforementioned methods?
   a. context.list("osgi:service/") is this a valid URL ?
   b. context.list(osgi:servicelist/) is this a valid URL ?
   c. If this(above (b)) is a valid scenario, does the Context object need to obtain first before doing list() and listbinding() queries? (Please find a sample code below)

    Context context = jndiContextManager.newInitialContext();
    Context listContext =                 context.lookup("osgi:servicelist/org.my.jndi.osgi.services.FooService")
    NamingEnumeration<NameClassPair> namingEnumeration =
          listContext.list("osgi:service/org.my.jndi.osgi.services.FooService");
   

In a scenario as above, is it valid to pass two different names to list() and lookup() methods (i.e context.lookup("osgi:servicelist/SERVICE-A") and do a context.list(osgi:servicelist/SERVICE-B) or what should passed as the parameters to the list() method) ?

As per the specification we mainly support list(), listbindings(), and lookup() methods. Can we consider the other methods such as bind(), rebind() , unbind() , rename() as operations that are not supported with the provider?

Appreciate any input on above queries.

[1] https://osgi.org/download/r6/osgi.enterprise-6.0.0.pdf

Thanks,
Nipuni

[bjhargrave]

Comment author: Nipuni Perera <nipuni880917@gmail.com>

I have raised this in osgi-dev list, and as per the replies:

1. "osgi:servicelist/" is a valid query. (this answers my first question)

2. We can imply that the other methods such as bind(), rebind() , unbind() , rename() as operations that are not supported with the provider. (this answers my last issue)

Appreciate if anyone can give a clarification on the other issues.

Seems my second question is not much clear. Hence adding the same question with more details below:

2. As per the specification, listBindings() and list() methods will return NamingEnumeration objects. Do both "service" and "servicelist" paths need to support aforementioned methods?
   a. eg: context.list("osgi:service/") is this a valid statement ?
   b. eg: context.list(osgi:servicelist/) is this a valid statement ?
   c. If this(above (b)) is a valid scenario, does the Context object need to obtain first, before doing list() and listbinding() queries? (Please find a sample code below)

    Context context = jndiContextManager.newInitialContext();
    Context listContext =                 context.lookup("osgi:servicelist/org.my.jndi.osgi.services.FooService")
    NamingEnumeration<NameClassPair> namingEnumeration = 
                                                                                                    listContext.list("osgi:service/org.my.jndi.osgi.services.FooService");
   

• In a scenario as above, is it valid to pass two different names to list() and lookup() methods (i.e context.lookup("osgi:servicelist/SERVICE-A") and do a context.list(osgi:servicelist/SERVICE-B)) ?

• In a scenario as above say we received a context object with lookup method.
  Context listContext = context.lookup("osgi:servicelist/");
  We should be able to do lookup() calls with this received context object. In such cases what should pass as the URL.
  eg: is it "listContext.lookup("osgi:servicelist/") or listContext.lookup("|")"

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Thanks,
Nipuni