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Subject: RE: [ebxml-cppa] reliable messaging comments
Arvola, Thanks for the clarification.
Tony, please add cross references in the persistDuration section to the
duplicate-elimination and message order semantics sections to enable
someone to find the rules that govern persistDuration. In addition, I
believe that my comment to 8.4.40 below is still operative.
Regards,
Marty
*************************************************************************************
Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287; IBM tie line 863-7287
Notes address: Martin W Sachs/Watson/IBM
Internet address: mwsachs @ us.ibm.com
*************************************************************************************
Arvola Chan
<arvola@tibco.com To: Martin W Sachs/Watson/IBM@IBMUS, ebxml-cppa@lists.oasis-open.org
> cc:
Subject: RE: [ebxml-cppa] reliable messaging comments
04/15/2002 02:39
PM
Marty:
The MessagingCharacteristics under DeliveryChannel element contains the
following attributes:
- syncReplyMode
- ackRequested
- ackSignatureRequested
- duplicateElimination
- actor
These attributes summarize the messaging behavior associated with the
delivery channel. Auxiliary information is found under the DocExchange
element.
The ReliableMessaging element provides retry, retry interval, and messaging
ordering semantics, if ackRequested is set to "always" or "perMessage". If
ackRequested is set to "none", then information provided by the
ReliableMessaging element is essentially ignored at run time.
The PersistDuration element was originally a sub-element of
ReliableMessaging. The decision to make it a sibling of ReliableMessaging
was made during the January CPP/A F2F meeting. The rationale was that in
ebMS 2.0, duplicate elimination can be controlled independent of the use of
the AckRequested element. The PersistDuration is needed to deterimine how
long a message should be kept in persistent storage to facilitate duplicate
elimination.
If the duplicateElimination attribute is set to "perMessage" or "always",
the PersistDuration element must be present. Similarly, if the ackRequested
element is set to "perMessage" or "always", the ReliableMessaging element
must be present. These constraints are already stated in the sections on
the
ackRequested attribute and on the duplicateElimination attribute. The CPA
composition tool should flag an error if any of these constraints is
violated.
-Arvola
-----Original Message-----
From: Martin W Sachs [mailto:mwsachs@us.ibm.com]
Sent: Saturday, April 13, 2002 9:29 PM
To: ebxml-cppa@lists.oasis-open.org
Subject: [ebxml-cppa] reliable messaging comments
Following are significant technical comments on reliable messaging in V1.11
that should be discussed as soon as possible
Section 8.4.40, ReliableMessaging element
We need to state what delivery semantics are implied by the presence of the
ReliableMessaging element. Is it onceAndOnlyOnce or does it depend on the
states of its child elements and the PersistDuration element?
Section 8.4.41, PersistDuration element
Since the PersistDuration has cardinality 0 or 1, we need tighter rules on
its use besides the rule that it must appear if MessageOrder is
"guaranteed".
PersistDuration applies to, and only to, reliable messaging. Therefore, it
should be a child element of the ReliableMessaging element.
We need to state what happens to duplicate elimination if the
PersistDuration element is omitted. Possibilities are:
Duplicate elimination takes place but the value of PersistDuration is a
local matter.
There is no duplicate elimination and the delivery semantics become
atLeastOnce, which is not really reliable messaging.
The short term answer to the above has to be consistent with ebMS 2.0.
Regards,
Marty
****************************************************************************
*********
Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287; IBM tie line 863-7287
Notes address: Martin W Sachs/Watson/IBM
Internet address: mwsachs @ us.ibm.com
****************************************************************************
*********
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