WSNP 4.11 - Managing message rates

[Matthew I Roberts <matt.roberts@uk.ibm.com>]

The initial WSN Policy document allocations
[1] gave me the section on
'Managing message rates'. This is linked
to section 4.10 on Boxcarring.


4.11        Managing
message rates

4.11.1        Description
  This policy option provides
the ability to configure the frequency at which
  event notifications are emitted
by a NotificationProducer, by specifying the
  minimum time interval that should
elapse between notifications.

  Applications that support this
policy MUST NOT emit event notifications more
  frequently than the time interval
specified in this policy. 


4.11.2        Options
  This policy is configured by
specifying the wsnp:minNotificationInterval
  element, which has the following
schema;

  <xsd:element name="minNotificationInterval"
type="xsd:positiveInteger"/>

  The value of the property is
defined as follows;

  xsd:positiveInteger    The
minimum time in seconds that must elapse between
         
               event notifications
from the NotificationProducer to
         
               the NotificationConsumer.


4.11.3        Context
  This policy element is specified
in the SubscriptionPolicy element of the
  Subscribe operation exposed
by the NotificationProducer. It is configured
  by the Consumer application
in order to limit the frequency of notifications
  received by the NotificationConsumer
that is the target of the subscription.

  This policy option also relates
to 4.10 on Boxcarring of messages. If both
  the boxcarring and minNotificationInterval
policies are specified together,
  then the effect is to wait for
the interval specified in this policy, after
  which time an event notification
will be emitted if the boxcarring 'min'
  condition has been met.


4.11.4        Example
  This example specifies that
the NotificationProducer should emit event
  notifications no more frequently
than once every 10 seconds.

  <wsnp:minNotificationInterval>10</wsnp:minNotificationInterval>



Matt Roberts
IBM WebSphere Messaging Design and Development
Hursley Park, England. +44 1962 815444
matt.roberts@uk.ibm.com
MP 211 / DE3H22

[1] http://www.oasis-open.org/apps/org/workgroup/wsn/email/archives/200512/msg00040.html