Policy Aware Interceptors

Policy-aware interceptors extract the collection of AssertionInfo objects for the assertion types they understand from the AssertionInfoMap in the message. They can then use the wrapped Assertion objects to fine tune their behaviour, possibly exhibiting message specific behaviour. They can also express whether or not they could support these assertions. Given an assertion type that has attributes, and assuming there are two instances of assertions of this type, it is possible that the interceptor can assert one, but not the other. In any case, inability to support all assertions understood by the interceptor does not necessarily indicate a failure. As mentioned above in relation to pre-emptive interceptor installation, it is possible that the ones that cannot be supported do not in fact apply to the underlying message at all. Typically the interceptor would strive at supporting as many of these assertions as possible however, and to do so it may avail of the AssertionBuilder's capability to compute a compatible assertion. For example, by scheduling an acknowledgement to be sent in 3 seconds, an RM interceptor would support both of the following RMAssertions:

<wsrmp:RMAssertion 
   xmlns:wsrmp="http://schemas.xmlsoap.org/ws/2005/02/rm/policy">
   <wsrmp:AcknowledgementInterval Milliseconds="30000"/>
</wsrmp:RMAssertion>
<wsrmp:RMAssertion 
   xmlns:wsrmp="http://schemas.xmlsoap.org/ws/2005/02/rm/policy">
   <wsrmp:AcknowledgementInterval Milliseconds="50000"/>
</wsrmp:RMAssertion>