SOA Governance and API Management : Getting Started with CentraSite : Implementation Concepts : Defining Design/Change-Time Policies : Policy Priority
Policy Priority
A policy has a priority value, which CentraSite uses when an event triggers multiple policies. You can give a policy a priority value between 11 and 9999 (inclusive). Priority 11 is the default. Values less than 11 and greater than 9999 are reserved for system use.
A policy's priority value is used only when an event triggers multiple policies. When this occurs, CentraSite examines the priorities of the selected policies and executes the policies serially, in priority order, from the lowest value to the highest value (that is, it executes the policy with the lowest value first). Each policy in the series is executed to completion before the next one begins.
For example, if an event were to trigger the following policies, CentraSite would execute the policies in the following order: B, A, C (as determined by the priority assignments 11, 25, and 100 respectively).
Policy
Policy
A
25
B
11
C
100
If multiple policies have the same priority, they will be executed serially, but their order is indeterminate. (That is, you cannot predict the order. CentraSite will choose the order at enforcement time.)
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