SOA S90.09 실제 시험문제 및 답변

문제1
Services A, B, and C are non-agnostic task services. Service A and Service B use the
same shared state database to defer their state data at runtime.
An assessment of these three services reveals that each contains some agnostic logic, but
because it is bundled together with the non-agnostic logic, the agnostic logic cannot be
made available for reuse.
The assessment also determines that because Service A and Service B and the shared
state database are each located in physically separate environments, the remote
communication required for Service A and Service B to interact with the shared state
database is causing an unreasonable decrease in runtime performance.

How can the application of the Orchestration pattern improve this architecture?

A. The application of the Orchestration pattern will result in an environment whereby the
State Repository and Service Data Replication patterns are naturally applied, allowing the
shared state database to be replicated for Services A and B so that each task service can
have its own dedicated state database. The Process Centralization pattern can also be
applied to Services A and B, so that their logic is physically centralized, turning them into
orchestrated task services.

B. None of the above.

C. The application of the Orchestration pattern will result in an environment whereby the
Compensating Service Transaction is naturally applied, resulting in the opportunity to
create sophisticated exception logic that can be used to compensate for the performance
problems caused by Services A and B having to remotely access the state database. The
Process Abstraction and Service Broker patterns are also naturally applied, enabling the
separation of non-agnostic logic and agnostic logic while providing common transformation
functions required to overcome any disparity in the service contracts that will need to be
created for the new agnostic services.

D. The application of the Orchestration pattern will result in an environment whereby the
Process Abstraction and Process Centralization patterns are naturally applied to Services
A, B, and C, resulting in a clean separation of non-agnostic task services from newly
designed agnostic services with reuse potential. Also, the State Repository pattern can be
applied by the availability of a central state database that can be shared by Services A and

E. This database can be made available as a local part of the environment so that Services
A and B can avoid remote communication.

정답: D,E

문제2
Services A, B, and C are non-agnostic task services. Service A and Service B use the
same shared state database to defer their state data at runtime.
An assessment of these three services reveals that each contains some agnostic logic, but
because it is bundled together with the non-agnostic logic, the agnostic logic cannot be
made available for reuse.
The assessment also determines that because Service A and Service B and the shared
state database are each located in physically separate environments, the remote
communication required for Service A and Service B to interact with the shared state
database is causing an unreasonable decrease in runtime performance.

You are asked to redesign this architecture in order to increase the opportunity for agnostic
service logic to be reused and in order to decrease the runtime processing demands so
that performance can be improved. What steps can be taken to achieve these goals?

A. The Enterprise Service Bus pattern can be applied to establish an environment whereby
the Process Abstraction and Process Centralization patterns are naturally applied, resulting
in a clean separation of non-agnostic task services from newly designed agnostic services
that are further shaped into reusable services by the application of the Service Reusability
principle.

B. The Process Centralization pattern can be applied, resulting in a redesign effort where
agnostic logic is removed from the three task services so that they only encapsulate non-
agnostic logic. The agnostic logic is then moved to one or more new agnostic services that
are shaped into reusable services by the application of the Service Reusability principle.
The Process Abstraction pattern is then applied to the redesigned task services Service A
and Service B, so that their logic is physically centralized, turning them into orchestrated
task services.

C. The Process Abstraction pattern can be applied, resulting in a redesign effort where
agnostic logic is removed from the three task services so that they only encapsulate non-
agnostic logic. The agnostic logic is then moved to one or more new agnostic services that
are shaped into reusable services by the application of the Service Reusability principle.
The Orchestration pattern can be further applied to establish an environment whereby the
Process Centralization pattern is naturally applied to Services A and B and the State
Repository pattern in naturally applied to further help avoid remote communication by
providing a local and centralized state database that can be shared by both services.

D. None of the above.

정답: C

문제3
The Client and Vendor services are agnostic services that are both currently part of
multiple service compositions. As a result, these services are sometimes subjected to
concurrent access by multiple service consumers.
The Client service is an entity service that primarily provides data access logic to a client
database but also provides some calculation logic associated with determining a client's
credit rating. The Vendor service is also an entity service that provides some data access
logic but can also generate various dynamic reports.
After reviewing historical statistics about the runtime activity of the two services, it was
discovered that the majority of concurrent runtime access is related to the processing of
business rules. With the Client service, it is the calculation logic that is frequently required
and with the Vendor service it is the dynamic reporting logic that needs to be accessed
separately from the actual report generation.

Currently, due to the increasing amount of concurrent access by service consumers, the
runtime performance of both the Client and Vendor services has worsened and has
therefore reduced their effectiveness as service composition members. What steps can be
taken to solve this problem without introducing new services?

A. The Redundant Implementation pattern can be applied to the Client and Vendor
services, thereby establishing duplicate implementations that can be accessed when a
service reaches its runtime usage threshold. The Intermediate Routing pattern can be
further applied to provide load balancing logic that can, at runtime, determine which of the
redundant service implementations is the least busy for a given service consumer request.

B. The Rules Centralization pattern can be applied by extracting the business rule logic
from the Client and Vendor services and placing it into a new Rules service. This will
naturally improve the runtime performance of the Client and Vendor services because they
will no longer be subjected to the high concurrent access of service consumers that require
access to the business rules logic.

C. None of the above.

D. The Rules Centralization pattern can be applied together with the Redundant
Implementation pattern to establish a scalable Rules service that is redundantly
implemented and therefore capable of supporting high concurrent access from many
service consumers. The Service Abstraction principle can be further applied to hide the
implementation details of the Rules service.

정답: A

문제4
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.)

A project team recently proclaimed that it has successfully applied the Contract
Centralization pattern to the service inventory in which the Invoice service, InvProc service,
and ProcInv service reside. Upon reviewing the previously described architecture you have
doubts that this is true. After voicing your doubts to a manager, you are asked to provide
specific evidence as to why the Contract Centralization is not currently fully applied. Which
of the following statements provides this evidence?

A. The Contract Centralization pattern is not fully applied because none of the invoice-
related services are carrying out data access logic via a centralized and standardized
invoice service. This is primarily because the Standardized Service Contract principle was
not consistently applied during the delivery processes of the individual services.

B. None of the above.

C. The Contract Centralization pattern is not fully applied to the Invoice, InvProc, and
ProcInv services because they are being accessed by different service consumers and
because they have redundant logic that introduces denormalization into the service
inventory.

D. The Contract Centralization pattern is not fully applied because Service Consumer D is
accessing the shared accounting database directly.

정답: D

최신SOA Design & Architecture Lab - S90.09무료샘플문제

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