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Subject: [wsrp] Type for supportedFeatures
- From: Rich Thompson <richt2@us.ibm.com>
- To: wsrp <wsrp@lists.oasis-open.org>
- Date: Tue, 5 Jul 2005 12:55:07 -0400
Subbu has suggested to me that a more
appropriate type for supportedFeatures would be QName (rather than string)
as this then enforces namespacing values. Although this introduces the
standard issue of defining the namespace URN (rather than just the prefix),
I think it would be a good change (and manageable within the WSDL).
As a corollary ... should we consider
the same change for similar fields (userScopes, mode, windowState &
userCategories)? I think not in order to stay compatible with v1, but want
to at least raise the question.
Rich
Rex Brooks <rexb@starbourne.com>
06/30/05 12:13 PM
|
To
| Michael Freedman <michael.freedman@oracle.com>,
wsrp <wsrp@lists.oasis-open.org>
|
cc
|
|
Subject
| Re: [wsrp] Re: TransientProperties |
|
Thanks Mike,
Hopefully we can bring back transient properties scopes.
It will be particularly useful for a number of reasons related to the Emergency
Management field, but it will also be useful for location-based services.
With Keyhole in Google,
http://earth.google.com/
Geospatial is about to make a splash. I suspect Version
3 will be impacted by greater implementer feedback. Too bad there's a delay
in downloading it, but that's beta, for ya.
Ciao,
Rex
At 7:56 AM -0700 6/30/05, Michael Freedman wrote:
Rex Brooks wrote:
[wsrp] Re: TransientProperties
Yup, Mike,
Ya definitely got my attention.
Q1: How are we planning to provide bookmarking/refresh
for TransientProperties in session? If it remains intact until explicitly
set, is it reasonably safe to push out to the user as navigationalState?
This has some impacts on Govt/Emergency Management networks, and it may
determine if I try to use v2.0 for the collected gaggle of pilots I'm managing
this summer.
This is one of the arguments for making
it a producer recommendation but consumer choice. Unlitmately the
consumer decides what is bookmarkable by limiting the scope of such data.
Q2: What happens if I need to leave Request on for the
length of an "incident, " which can span hours to as much as
a month, but needs to specifically be transient so that scope of the "incident"
is maintained. It is also likely to be a fairly hairy scalability problem,
depending...?
Again, this is a consumer choice and I suspect
most consumers would not keep transient data around this long. I
suspect this usage fits better with producers that use events to impact
internal state that they can manage via a persistent cache.
Interesting,
Rex
At 5:54 PM -0700 6/29/05, Michael Freedman wrote:
Second round of ideas for supporting transientProperties
based on last weeks discussion:
On the issue of "local" vs "shared" -- I think we can
live with Rich's suggestion that this noth be expressed, rather it be left
to consumer policy. I.e. instead of relying on capabilities we should
just state that identical property name reference [in distinct portlet
usages] are assumed to refer to the same property/value unless a Conumer
policy indicates otherwise.
On the issue of scoping transient properties -- change what was proposed
last week to reflect that the producer is requesting not demanding a scope.
i.e. call the field "preferredScope" vs. "scope"
reflecting our preference that the consumer has the ability to manage the
transient scoping as it sees fit.
This would leave us with:
PropertyDescription
[R] QName name
[R] QName type
[O] LocalizedString label
[O] LocalizedString hint
[O] string capabilities[]
[O] Extension extensions[]
TransientPropertyDescription extends PropertyDescription
[R] string preferredScope [wsrp:request,
wsrp:session, .... open ended list so new scopes can be added]
RuntimeContext
[R] string userAuthentication
[O] Key portletInstanceKey
[O] string namespacePrefix
[O] Templates templates
[O] ID sessionID
[O] Property publicParameters[]
[O] Extension extensions[]
-Mike-
Michael Freedman wrote:
Here is the writeup I volunteered to produce last week
which extends the current notion of PublicParameters to add transient property
like capabilities. This should get people's juices flowing:
Summary:
Address the various incoming requirements by adding two new concepts:
1. TransientProperties: properties
whose values are managed by the consumer for a transient length of time
[as defined by a consumer scope].
2. Shared PublicParameters vs. Local
PublicParameters: distinguish between two types of public parameters.
Shared public parameters are shared in that they are defined a single
consumer managed namespace. Local public parameters aren't shared
in that they are defined in a per [wsrp] portlet namespace.
The first concept allows a producer to indicate the lifetime
this property should be maintained. Request means the property's
value is only maintained for the duration of the client request. Current
or new values must be established in each subsequent request. Session
means the property's value is maintained for the duration of the consumer's
client/user session. While the session remains intact, the property's
value is maintained until explictly set.
The second concept allows a producer to indicate whether the property it
is placed in a global shared consumer space or a local per portlet space.
The former allows two or more cooperating consumer component's to
share a value while the later ensures the portlet has a discretely managed
value [though this value may be impacted by others via a consumer supplied
wiring mechanism].
Note: An open, unresolved issue is whether the transient property
scope is considered part of the namespace or not. I.e. what do we
do if two portlets publish a shared public parameter foo.bar but each publishes
at a different transient scope [request and session]? Do we use these
scopes as "hints" and defer to the greater scope [session]? Do
we publish at each scope and view them as separate values?
Setting values:
A shared or local public parameter value can be set in a variety of ways:
1. By the client -- we would define
the URL parameter name mapping to both shared and local public parameters
so clients can express values for them directly in the request URL. Note:
we would have to define what happens if duplicate parameters appear in
the request for a scalar type.
2. In a portlet's Action or Render
URL - based on the name mapping defined above we would allow portlet's
to render action and render URLs which directly express new values for
either shared or local public parameters.
3. As a result of an action or event.
Details of each of these to be provided later if the general
appraoch is abgreed upon.
Anyway: the structural details:
For review:
PropertyDescription
[R] QName name
[R] QName type
[O] LocalizedString label
[O] LocalizedString hint
[O] string capabilities[]
[O] Extension extensions[]
TransientPropertyDescription extends PropertyDescription
[R] string scope [wsrp:request, wsrp:session,
.... open ended list so new scopes can be added]
RuntimeContext
[R] string userAuthentication
[O] Key portletInstanceKey
[O] string namespacePrefix
[O] Templates templates
[O] ID sessionID
[O] Property sharedPublicParameters[]
[O] Property localPublicParameters[]
[O] Extension extensions[]
-Mike-
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--
Rex Brooks
President, CEO
Starbourne Communications Design
GeoAddress: 1361-A Addison
Berkeley, CA 94702
Tel: 510-849-2309
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Rex Brooks
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Starbourne Communications Design
GeoAddress: 1361-A Addison
Berkeley, CA 94702
Tel: 510-849-2309
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