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EXHIBIT 14.18 PAY BILL TRANSACTION: MANY-TO-MANY EXAMPLE
300 Ch. 14 Service-Oriented Transaction Model
transactions and their underlying activities. These logical associations that were discovered earlier
in the design phase shape message exchange and delivery paths and provide a vital input to the
service orchestration and choreography process.
The design logical relationships, however, can be further formalized and expanded beyond
local asset interaction, widening the scope of transaction to include logical design complex
formations. Thus, devised logical design compositions (discussed in Chapter 13) are now employed
to depict a larger transaction activity scale. This may involve transaction coordination and collaboration
among service clusters, atomic and composite formations that operate across departments,
organizations, lines of business, or geographically distributed business domains.
Now consider transaction activities that take place within logical design compositions and
explore service interaction in formal logical composition styles.
Circular Transaction. Recall that the circular design composition style is recommended for
transactions that employ a chain of interdependent services to perform sequential activities that
represent a business process. We often name such a style ???round trip??? to denote a transaction that
terminates at the same point it originates from.
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