An enterprise architect has requested the Salesforce Integration architect to review the following (see diagram...

Salesforce Integration-Architect Question Answer

An enterprise architect has requested the Salesforce Integration architect to review the following (see diagram & description) and provide recommendations after carefully considering all constraints of theenterprise systems and Salesforce platform limits.

• About 3,000 phone sales agents use a Salesforce Lightning UI concurrently to check eligibility of a customer for a qualifying offer.

• There are multiple eligibility systems that provides this service and are hosted externally. However, their current response times could take up to 90 seconds to process and return (there are discussions to reduce the response times in future, but no commitments are made).

• These eligibility systems can be accessed through APIs orchestrated via ESB (MuleSoft).

• All requests from Salesforce will have to traverse through customer's API Gateway layer and the API Gateway imposes a constraint of timing out requests after 9 seconds.

Which three recommendations should be made?

Choose 3 answers

ESB (Mule) with cache/state management to return a request ID (or) response if available from external system.

Recommend synchronous Apex call-outs from Lightning UI to External Systems via Mule and implement polling on API gateway timeout.

Use Continuation callouts to make the eligibility check request from Salesforce from Lightning UI at page load.

When responses are received by Mule, create a Platform Event in Salesforce via Remote-Call-In and use the empAPI in the lightningUI to serve 3,000 concurrent users.

Implement a 'Check Update' button that passes a request ID received from ESB (user action needed).

Explanation:

Option A is correct because using ESB (Mule) with cache/state management can help to handle the long-running requests from Salesforce and return a request ID or a response if available from the external systems. This way, Salesforce does not have to wait for the externalsystems to respond and can avoid the API gateway timeout1

Option C is correct because using Continuation callouts can make the eligibility check request from Salesforce from Lightning UI at page load without blocking the UI thread. Continuation callouts are asynchronous and can handle long-running requestsup to 60 seconds23

Option E is correct because implementing a ‘Check Update’ button that passes a requestID received from ESB can allow the user to manually check the status of the eligibility check request. This can be useful when theresponse is not available within the Continuation timeout limit or when the user wants to refresh the data4

Option B is incorrect because recommending synchronous Apex callouts from Lightning UI to External Systems via Mule and implementing polling on APIgateway timeout can cause performance issues and user frustration. Synchronous Apex callouts block the UI thread and can only handle requests up to 120 seconds. Polling on API gateway timeout can increasethe network traffic and consume the callout limits25

Option D is incorrect because creating a Platform Event in Salesforce via Remote-Call-In and using the empAPI in the lightning UI to serve 3,000 concurrent users can introduce complexity and scalability issues. Platform Events are meant for event-driven architecture and not for request-response scenarios. Remote-Call-In requires an additional license and configuration. empAPI has a limit of 1,000 concurrent subscribers per channel678

References: 1: MuleSoft Documentation 2: Salesforce Documentation 4: Salesforce Trailhead 3: Salesforce Developers Blog 5: Salesforce Documentation 6: Salesforce Documentation 7: Salesforce Documentation 8: Salesforce Documentation

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