The topmost panel of the service-oriented transaction diagram
is the consumer and service section. This is the area in which are placed all the assets participating
in the transactions to be described. Thus, the consumer and service section can be populated
with atomic services, composite services, service clusters, and service requestors??”consumers.
There is no particular required order to position these entities. Moreover, use the design asset
notation icons for each entity that takes part in the service-oriented transaction diagram.
Since the deliverables for the service-oriented design model may involve composite services
or service cluster structures, the service transaction diagram must reflect the references to
the containing entities. Therefore, the consumer and service section also contains an aggregator
entity panel, positioned at the upper corner of the consumer and service panel.
Exhibit 14.2 illustrates a consumer and service section example. The aggregating asset,
the trading service cluster, is positioned on the upper left side of this panel in the aggregator
entity panel. On the bottom, are the four contained services that take part in this transaction.
Note that each entity is also labeled by a corresponding tag: investment consumer, fixed-income
composite service, equities atomic service, and mutual funds atomic service.
SESSION SECTION. A session is a unit of time during which a single or multiple transactions are
executed to complete one or more business processes.
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