Best Practices and Performance B2C-COMMERCE-DEVELOPER Practice Questions (Page 5)

Questions 21–23

1. 21application · medium

   A B2C Commerce developer is designing a process that sends a confirmation email to a customer after an order is placed. The email service can occasionally take up to 10 seconds to respond. The developer wants to ensure the order placement response to the customer is not delayed. Which approach best follows scalability best practices?

   • ACache the email content and send it only when the customer views their order history.
   • BUse a queue to send the email asynchronously after the order is placed.
   • CSend the email in a background job that runs every hour.
   • DCall the email service synchronously in the order controller and wait for the response before rendering the confirmation page.
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2. 22application · medium

   A developer is refactoring a controller that currently calls `ProductMgr.getProduct()` for each product ID in a list of 50 IDs. The developer wants to reduce the number of database queries. Which refactoring approach is most effective?

   • AUse a loop but cache each product in a custom object after the first retrieval.
   • BUse `ProductMgr.query()` with a filter on the product ID field.
   • CUse `ProductMgr.getProduct()` but wrap it in a try-catch to handle errors.
   • DUse `ProductMgr.getProducts()` with a query that matches all the IDs.
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3. 23foundation · easy

   A developer is reviewing a controller that calls a custom service inside a loop that iterates over a product list. Which code pattern is a best practice violation?

   • AUsing a try-catch block around the service call
   • BUsing a loop to call an external service for each product
   • CLogging the service response for debugging
   • DCaching the service response for a short duration
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