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Subject: Re: [wsrp-wsia] [wsrp] initEnvironment and groupID - my final thoughtsbefore we vote







You state that "initEnvironment() satisfies/supports JSR 168" ... from our
recent discussion of this topic, this is true only if there is a Producer
per portlet application. In considering whether this will be a reasonable
restriction, I would like to see some estimates of the number of portlet
applications in a typical portal deployment. I wonder whether this would be
an acceptable restriction to spec implementations/deployments. It has
significant impacts on areas such as registration. I would also note that
there have been 2 proposed means for the Producer to achieve the necessary
function without initEnvironment().

My personal preference is that if we introduce the concept of
Producer-mediated sharing into the protocol at all, it should include
Consumer specified scoping on that sharing. The possibility I have heard
proposed for this is:

 - The entity metadata includes a "preferredGroupID". For JSR168, this maps
directly to the portlet application name.
 - The protocol includes groupID in the current manner with the semantics
tightened to require the Producer to scope any data sharing by the supplied
groupID. The Producer would still be free to further scope the data sharing
according to its policies.

This combination allows Producers to scope data sharing more tightly than
the Consumer specifies, but does not allow crossing the Consumer specified
boundary (supports the often mentioned a1/b1 & a2/b2 on the same page use
case).

If we do not introduce Consumer scoping of the data sharing, then I again
question what the Producer-mediated data sharing concept is doing in the
protocol.



                                                                                                                  
                      Michael Freedman                                                                            
                      <Michael.Freedman@        To:       wsrp-wsia@lists.oasis-open.org                          
                      oracle.com>               cc:                                                               
                                                Subject:  Re: [wsrp-wsia] [wsrp] initEnvironment and groupID - my 
                      10/10/2002 02:12           final thoughts before we vote                                    
                      PM                                                                                          
                                                                                                                  
                                                                                                                  



Well, I think Andre may be technically correct -- in that the servlet
architecture allows one to place a filter in front of the a [set of]
applications and this filter could implement/expose its own notion of
HttpSession for the application on top of/within the HttpSession
established
between the consumer and the producer.  It would be an extraordinary
implementation.  Without writing such special code to mimic the true
servlet
session, Carsten you are right that one ends up with a single JSR
application
per producer.  However, even in Andre's situation there is no need for a
group
ID.  The producer has the information available to it do the proper
filtering/partitioning without any consumer management.

In the end Carsten, I think your e-mail lays out the discussion very well.
We
know that initEnvironment() satisfies/supports JSR 168.  So the question
before
us is what level of support do we want for non-JSR environments?

There are only three choices:
   1) No [additional] sharing is defined by the protocol.  Any [additional]
sharing information has to be carried entirely via the extension mechanism.
  2) The protocol defines very specific consumer semantics for at least one
form of sharing.  Vendors can choose to further extend this semantic via
the
extension mechanism.
  3) The protocol allows a producer to express very specific producer
semantics
for at least one form of sharing.  Vendors can choose to further extend
this
semtanic via the extension mechanism.

Currently, the specification tries to do 2.  It defines a "groupID" to
carry a
consumers notion of how portlets are grouped.  It further states. "Section
7.1.1 (page 31, line 20): "Since Consumers will not know what entities
could
benefit from any Producer mediated data sharing, they SHOULD place all
entities
from a Producer within a single group until a reason is identified for
specifying a separate groupID."  This definition has two problems.  It
neither
defines a specific semantic (it uses the term SHOULD) nor is the semantic
useful.

I suggest that our default choice should be (1).  Sharing is not defined
and
therefore must be added as a vendor extension.  For those of you that would
like to see sharing in v1, whether of the form (2) or (3), I think your
burden
is to provide us with a clearly defined semantic and to get consensus from
all
of us that all consumers will/should support this semantic [in v1].  Though
I
have heard arguments for keeping sharing I haven't yet seen a proposal that
defines its semantics clearly.  Does anyone want to make a proposal?

   -Mike-




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