SOA Design & Architecture Lab - S90.09 Exam Practice Test
Service A is a task service that sends Service B a message (2) requesting that Service B
return data back to Service A in a response message (3). Depending on the response
received. Service A may be required to send a message to Service C (4) for which it
requires no response.
Before it contacts Service B, Service A must first retrieve a list of code values from its own
database (1) and then place this data into its own memory. If it turns out that it must send a
message to Service C, then Service A must combine the data it receives from Service B
with the data from the code value list in order to create the message it sends to Service C.
If Service A is not required to invoke Service C, it can complete its task by discarding the
code values.
Service A and Service C reside in Service Inventory A.
Service B resides in Service Inventory B.
You are told that the services in Service Inventory A were designed with service contracts
based on different design standards than the services in Service Inventory B.
As a result,Service A and Service B use different data models to represent the data they need to
exchange. Therefore, Service A and Service B cannot currently communicate.
Furthermore, Service C is an agnostic service that is heavily accessed by many concurrent
service consumers. Service C frequently reaches its usage thresholds during which it is not
available and messages sent to it are not received. How can this service composition
architecture be changed to avoid these problems?
return data back to Service A in a response message (3). Depending on the response
received. Service A may be required to send a message to Service C (4) for which it
requires no response.
Before it contacts Service B, Service A must first retrieve a list of code values from its own
database (1) and then place this data into its own memory. If it turns out that it must send a
message to Service C, then Service A must combine the data it receives from Service B
with the data from the code value list in order to create the message it sends to Service C.
If Service A is not required to invoke Service C, it can complete its task by discarding the
code values.
Service A and Service C reside in Service Inventory A.
Service B resides in Service Inventory B.
You are told that the services in Service Inventory A were designed with service contracts
based on different design standards than the services in Service Inventory B.
As a result,Service A and Service B use different data models to represent the data they need to
exchange. Therefore, Service A and Service B cannot currently communicate.
Furthermore, Service C is an agnostic service that is heavily accessed by many concurrent
service consumers. Service C frequently reaches its usage thresholds during which it is not
available and messages sent to it are not received. How can this service composition
architecture be changed to avoid these problems?
Correct Answer: A
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The architecture for Service A displayed in the Figure shows how the core logic of Service
A has expanded over time to connect to a database and a proprietary legacy system (1)
and to support two separate service contracts (2) that are accessed by different service
consumers.
The service contracts are fully decoupled from the service logic. The service logic is
therefore coupled to the service contracts and to the underlying implementation resources
(the database and the legacy system).
Service A currently has three service consumers. Service Consumer A and Service
Consumer B access Service A's two service contracts (3, 4). Service Consumer C
bypasses the service contracts and accesses the service logic directly (5).
You are told that the database and legacy system that are currently being used by Service
A are being replaced with different products. The two service contracts are completely
decoupled from the core service logic, but there is still a concern that the introduction of the
new products will cause the core service logic to behave differently than before. What steps
can be taken to change the Service A architecture in preparation for the introduction of the
new products so that the impact on Service Consumers A, B, and C is minimized?
A has expanded over time to connect to a database and a proprietary legacy system (1)
and to support two separate service contracts (2) that are accessed by different service
consumers.
The service contracts are fully decoupled from the service logic. The service logic is
therefore coupled to the service contracts and to the underlying implementation resources
(the database and the legacy system).
Service A currently has three service consumers. Service Consumer A and Service
Consumer B access Service A's two service contracts (3, 4). Service Consumer C
bypasses the service contracts and accesses the service logic directly (5).
You are told that the database and legacy system that are currently being used by Service
A are being replaced with different products. The two service contracts are completely
decoupled from the core service logic, but there is still a concern that the introduction of the
new products will cause the core service logic to behave differently than before. What steps
can be taken to change the Service A architecture in preparation for the introduction of the
new products so that the impact on Service Consumers A, B, and C is minimized?
Correct Answer: C
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Service Consumer A sends a message to Service A (1), which then forwards the message
to Service B (2). Service B forwards the message to Service C (3), which finally forwards
the message to Service D (4).
Services A, B, and C each contain logic that reads the content of the message and, based
on this content, determines which service to forward the message to. As a result, what is
shown in the Figure is one of several possible runtime scenarios.
Currently, this service composition architecture is performing adequately, despite the
number of services that can be involved in the transmission of one message. However, you
are told that new logic is being added to Service A that will require it to compose one other
service in order to retrieve new data at runtime that Service A will need access to in order
to determine where to forward the message to. The involvement of the additional service
will make the service composition too large and slow. What steps can be taken to improve
the service composition architecture while still accommodating the new requirements and
avoiding an increase in the amount of service composition members?
to Service B (2). Service B forwards the message to Service C (3), which finally forwards
the message to Service D (4).
Services A, B, and C each contain logic that reads the content of the message and, based
on this content, determines which service to forward the message to. As a result, what is
shown in the Figure is one of several possible runtime scenarios.
Currently, this service composition architecture is performing adequately, despite the
number of services that can be involved in the transmission of one message. However, you
are told that new logic is being added to Service A that will require it to compose one other
service in order to retrieve new data at runtime that Service A will need access to in order
to determine where to forward the message to. The involvement of the additional service
will make the service composition too large and slow. What steps can be taken to improve
the service composition architecture while still accommodating the new requirements and
avoiding an increase in the amount of service composition members?
Correct Answer: A
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Our service inventory contains the following three services that provide invoice-related data
access capabilities: Invoice, InvProc, and Proclnv. These services were created at different
times by different project teams and were not required to comply to any design standards.
Therefore each of these services has a different data model for representing invoice data.
Currently each of these three services has one service consumer: Service Consumer A
accesses the Invoice service(1). Service Consumer B (2) accesses the InvProc service,
and Service Consumer C (3) accesses the Proclnv service. Each service consumer
invokes a data access capability of an invoice-related service, requiring that service to
interact with the shared accounting database that is used by all invoice-related services (4,
5, 6).
Additionally, Service Consumer D was designed to access invoice data from the shared
accounting database directly (7), (Within the context of this architecture. Service Consumer
D is labeled as a service consumer because it is accessing a resource that is related to the
illustrated service architectures.)
Assuming that the Invoice service, InvProc service, and ProcInv service are part of the
same service inventory, what steps would be required to fully apply the Official Endpoint
pattern?
access capabilities: Invoice, InvProc, and Proclnv. These services were created at different
times by different project teams and were not required to comply to any design standards.
Therefore each of these services has a different data model for representing invoice data.
Currently each of these three services has one service consumer: Service Consumer A
accesses the Invoice service(1). Service Consumer B (2) accesses the InvProc service,
and Service Consumer C (3) accesses the Proclnv service. Each service consumer
invokes a data access capability of an invoice-related service, requiring that service to
interact with the shared accounting database that is used by all invoice-related services (4,
5, 6).
Additionally, Service Consumer D was designed to access invoice data from the shared
accounting database directly (7), (Within the context of this architecture. Service Consumer
D is labeled as a service consumer because it is accessing a resource that is related to the
illustrated service architectures.)
Assuming that the Invoice service, InvProc service, and ProcInv service are part of the
same service inventory, what steps would be required to fully apply the Official Endpoint
pattern?
Correct Answer: C
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