EAI — Insufficiency of the metamodel mapping for aggregators

Document: UML Profile and Interchange Models for EAI
Section: 8.3.12 (Aggregators)

Description:
The metemodel for EAIAggregator in Section 6.4.1.6 allows a DIFFERENT aggregateComplete and addToAggregate condition for EACH aggregate being formed. However, Section 8.3.12 only provides for the specification of a one aggregateComplete and one addToAggregate operation for the entire aggregator. (These operations take a specific aggregate as an argument, but the BEHAVIOR of the operation will be the same for all aggregates.)

Recommendation:
Define a new <<MessageAggregation>> stereotype. A class with this stereotype must have aggregateComplete and addToAggregate operations. Such a class maps to the EAIMessageAggregation metaclass (see Section 6.4.1.6). Require that a class with the stereotype <<Aggregator>> have associations with one or more <<MessageAggregation>> classes (note that multiple message aggregations can be achieved both by having an association with a multiplicity at the message aggregation end of greater than 1 or by having multiple associations with different message aggregation classes with different operator specifications).

(Also change mapping constraints 20 an 21 in Section 8.6.2 to be consistent with this.)

see above