S90-08A Sample Questions & Answers

An architect is designing a service inventory for an e-commerce platform. A key non-functional requirement is to minimize data replication between services to ensure strong consistency. The 'Product' and 'Inventory' services are separate, but the 'Product' service needs to display real-time stock levels. Which design pattern directly addresses this requirement by avoiding data replication and ensuring the 'Product' service always has the most current inventory data?

While reviewing a proposed service-oriented architecture, you notice that a single, large 'Order Management' service is responsible for validating orders, processing payments, checking inventory, and arranging shipping. This design violates the 'Service Composability' principle. What is the primary negative consequence of this design flaw?

A development team is building an orchestration that involves calling a partner's web service. The partner service is known to be unreliable and sometimes takes an excessively long time to respond, causing threads in the orchestration engine to be blocked. To improve the resilience and scalability of the orchestration, the architect wants to prevent the engine's threads from being consumed by these unreliable calls. Which pattern should be applied?

A retail company is migrating from a monolithic application to a service-oriented architecture. They have a large, complex legacy database that is accessed by many parts of the old application. The architects want to avoid having multiple new services directly access this shared database, as it would create tight coupling and contention. Which pattern provides a standardized way to encapsulate access to this legacy data source?

During the design of a service composition, an architect needs to decide where to place complex business rules that determine which services to invoke based on the content of an incoming message. For example, if a loan application has a credit score above 750, it should be routed to the 'Instant Approval' service; otherwise, it should go to the 'Manual Review' service.

To maximize agility and allow business analysts to modify these rules without requiring developer intervention, which pattern should be applied in conjunction with an orchestration?

A solution requires a service that can be invoked through multiple transport protocols, including HTTP, JMS, and FTP, and with different data formats such as XML and JSON. To avoid creating separate service endpoints for each combination, the architect wants to define a single abstract service contract and then map it to multiple physical endpoints. Which design pattern directly supports this requirement?

A manufacturing company uses an Enterprise Service Bus (ESB) to integrate its systems. The ESB is configured with a complex chain of message processing steps: receiving a message, validating its schema, transforming it to a canonical format, enriching it with customer data from a CRM service, and then routing it to one of three backend systems based on its content. This entire sequence of steps represents the application of which compound pattern?

Company Background:
FinCorp, a large financial institution, is building a new loan origination platform. The platform must be highly scalable and resilient. A key part of the process is a credit check, which is performed by an external, third-party service.

Technical Challenge:
The external credit check service has a strict SLA of 2 seconds for 99% of requests. However, 1% of requests can take up to 30 seconds to complete during peak loads. The loan origination service, which calls the credit check service, must not have its performance degraded or its resources (like thread pools) exhausted by these slow responses.

Architectural Goal:
The solution must ensure that a slow credit check response does not impact the overall performance of the loan origination service. It must also provide a mechanism to handle failures or timeouts from the credit check service gracefully.

Which combination of patterns provides the most robust and performant solution for integrating with the external credit check service?

A telecom company needs to ensure that all billable events, such as phone calls and data usage, are logged for auditing and compliance purposes. This logging logic must be applied to several different services within the service inventory. To avoid code duplication and ensure consistent application of the logging policy, the architect decides to use an intermediary component that intercepts messages sent to these services.

Which TWO patterns, when used together, best describe this solution? (Select TWO)

True or False: In a service-oriented architecture, applying the Service Data Replication pattern always leads to a violation of the service autonomy principle because it creates a data dependency between the source and replicated data stores.