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Subject: RE: [wsrp] handleEvent or handleEvents?

Title: RE: [wsrp] handleEvent or handleEvents?

I agree that we can't postulate reliable event or failure notification. However, best effort delivery of network and event handling failure indications to interested portlets is still useful as it allows them to offer alternative user interactions.


-----Original Message-----
From: Richard Jacob [mailto:richard.jacob@de.ibm.com]
Sent: 13 December 2004 18:38
To: Andre Kramer
Cc: wsrp@lists.oasis-open.org
Subject: RE: [wsrp] handleEvent or handleEvents?

One other important point to me is that we really should understand the
nature of events.
Portlets shouldn't rely on event delivery and thus also shouldn't rely on
correct event processing.
We also do not deliver failure events back to the portlet issuing the
original event (this was the first design we had).
Therefore we might want to ask ourselves what event failures are really for
and who will be doing what with this information.
Key point for me is that we shouldn't try to implement a (relyable)
messaging system based on events, i.e. we shouldn't add any
atomicy,rollback, etc. rules to eventing.

Mit freundlichen Gruessen / best regards,

        Richard Jacob
IBM Lab Boeblingen, Germany
Dept.8288, WebSphere Portal Server Development
WSRP Standardization Technical Lead
Phone: ++49 7031 16-3469  -  Fax: ++49 7031 16-4888
Email: mailto:richard.jacob@de.ibm.com

             Andre Kramer                                                 
             citrix.com>                                                To
             12/13/2004 03:17                                           cc
                                       RE: [wsrp] handleEvent or          

Recognizing that event processing occurs in rounds would also help the
presentation. Each round involves a consumer delivering a batch of events
to the producer and optionally receiving back a further batch of events
(and failure events) to process.


From: Rich Thompson [mailto:richt2@us.ibm.com]
Sent: 13 December 2004 14:10
To: wsrp@lists.oasis-open.org
Subject: Re: [wsrp] handleEvent or handleEvents?

The F2F decision was to drop to handleEvent for now due to the issues
involved in handling faults in the batched case. We should work on these
and seek to restore the nature to a batch operation for the reasons you
list. Basically the solution should respect the current overall design:

1. Portlets are loosely coupled components integrated onto the page by the
2. Events are notifications that something has occurred which other
components may use to impact their own state.
3. There are times when a Consumer will care what failures have occurred
(e.g. for retry purposes)

I think if we agree to these guidelines, then relatively simple solutions
to the failure issues in the batch operation can be designed. Any comments
on these as guidelines before we try and design/debate a solution?


 Andre Kramer                                                             
 12/10/2004 07:06 AM                                 wsrp@lists.oasis-open
                                                     [wsrp] handleEvent or

My comment is on the current 2.0 draft, so I am sending it to the TC list,
even though it is specific to coordination. As initially written,
handleEvent is constrained to only deliver a single (IN) event and requires
the consumer to not deliver a second event while the first is being
processed (but multiple events can be returned by a portlet). This seems an
unworkable solution to me because of (1) network latency and (2) event
processing logically occurs in rounds. Should we start with handleEvents
rather than try to discuss a handleEvent?



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