Which of the following statements about observers in Adobe Commerce are considered best practices? (Choose 2.)

Question

Options

• AObservers should be coded defensively and not assume specific data will always be present in the
• BObservers should be designed to be lean and performant to avoid degrading the performance of
• CObservers should contain complex business logic and database write operations to keep
• DIt is a good practice for an observer to dispatch a new custom event.
• EAn observer's logic should be placed directly inside the 'execute' method without using

• A
  71% (15)
• C
  5% (1)
• D
  19% (4)
• E
  5% (1)

Explanation

A is correct because events may be triggered in varying contexts where expected data objects or keys are absent - defensive coding (e.g., null checks before accessing $observer->getData(...)) prevents fatal errors and makes observers resilient across different code paths.

B is correct because observers execute synchronously within the request lifecycle; a slow or resource-heavy observer blocks the entire request, directly degrading storefront or admin performance for every event dispatch.

C is wrong - complex business logic and database writes belong in dedicated service classes or models, not observers. Observers should delegate to those classes, keeping themselves thin and testable.

D is wrong - dispatching a new event inside an observer creates the risk of circular event chains or cascading side effects that are difficult to debug and maintain. Adobe's documentation explicitly cautions against this.

E is wrong - the execute method should delegate to injected helper/service classes rather than containing all logic inline; this improves readability, reusability, and unit testability.

Memory tip: Think of observers as traffic cops, not workers. They should quickly check conditions (A - verify what's there) and wave traffic through efficiently (B - stay fast), then hand off real work to others. A traffic cop who builds roads, radios other cops, or does paperwork at the intersection causes gridlock.

No community discussion yet for this question.