SOA Design & Architecture Lab - S90.09 Exam Practice Test

Service A is a task service that is required to carry out a series of updates to a set of
databases in order to complete a task. To perform the database updates Service A must
interact with three other services, each of which provides standardized data access
capabilities.
Service A sends its first update request message to Service B (1), which then responds
with a message containing a success or failure code (2). Service A then sends its second
update request message to Service C (3), which also responds with a message containing
a success or failure code (4). Finally, Service A sends a request message to Service D (5),
which responds with its own message containing a success or failure code (6).

You've been asked to change this service composition architecture in order to fulfill a set of
new requirements: First, if the database update performed by Service B fails, then it must
be logged by Service A.
Secondly, if the database update performed by Service C fails,
then a notification e-mail must be sent out to a human administrator. Third, if the database
update performed by either Service C or Service D fails, then both of these updates must
be reversed so that the respective databases are restored back to their original states.
What steps can be taken to fulfill these requirements?
Correct Answer: B