WS-Topics Muse implementation should support messageType and messagePattern
constraints
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Key: MUSE-151
URL: http://issues.apache.org/jira/browse/MUSE-151
Project: Muse
Issue Type: Improvement
Affects Versions: 2.1.0
Environment: any
Reporter: Mohammad Fakhar
Assigned To: Dan Jemiolo
Priority: Minor
The WS-Topics spec defines messageTypes and messagePattern options for
specifying message type constraints on a topic at declaration time.
The following are snippets from the spec for these two options:
1) "/wstop:Topic/@messageTypes
An optional list of the QNames of XML elements that define the types of
NotificationMessage
that may be used with the Topic. A Publisher using a given Topic MUST NOT
generate a
NotificationMessage whose type is not included in this list, although the
special value xsd:any
indicates that any NotificationMessage type MAY be used. A given QName MAY
appear
multiple times in the list; second or subsequent appearance of a given QName
are not
meaningful and MAY BE ignored. If this list is empty, or the attribute not
defined, the default
value ofxsd:any is assumed."
2) "/wstop:Topic/MessagePattern
An optional QueryExpression as defined by WS-ResourceProperties. This
QueryExpression
is used to describe the pattern of the message that will appear on the Topic.
Conceptually,
the MessagePattern component can be thought of as the object of an boolean()
expression,
evaluated against a NotificationMessage. This boolean() expression, with the
value of
MessagePattern as parameter, is guaranteed to evaluate to "true" when evaluated
in the
context of any NotificationMessage that is associated with the Topic. The
MessagePattern
component constrains the NotificationMessages that can be used with the Topic.
It is
additional to the constraint contained in @messageTypes, and provides a further
refinement
to that constraint."
These two opttions are not supported by Muse's Ws-Topics implementation
currently; they are optional and
can be added as an improvement to the WS-Topics support in Muse.
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