| Description | If, while checking to see which policy conditions match an
element, 2 or more ready policies in the same precedence group
match the same element, the pmPolicyPrecedence object provides
the rule to arbitrate which single policy will be active on
'this element'. Of policies in the same precedence group, only
the ready and matching policy with the highest precedence
value (e.g., 2 is higher than 1) will have its policy action
periodically executed on 'this element'.
When a policy is active on an element but the condition ceases
to match the element, its action (if currently running) will
be allowed to finish and then the condition-matching ready
policy with the next-highest precedence will immediately
become active (and have its action run immediately). If the
condition of a higher-precedence ready policy suddenly begins
matching an element, the previously-active policy's action (if
currently running) will be allowed to finish and then the
higher precedence policy will immediately become active. Its
action will run immediately, and any lower-precedence matching
policy will not be active anymore.
In the case where multiple ready policies share the highest
value, it is an implementation-dependent matter as to which
single policy action will be chosen.
Note that if it is necessary to take certain actions after a
policy is no longer active on an element, these actions should
be included in a lower-precedence policy that is in the same
precedence group. |