PD1 Integration Architecture 5 — Questions and Answers
Question 1: When using the Salesforce Streaming API, what is the default message retention duration for PushTopic events?
- 1 hour
- 24 hours (Correct answer)
- 72 hours
- 7 days
Correct answer: 24 hours
Salesforce retains PushTopic Streaming API messages for 24 hours, allowing replay of missed events within that window.
Question 2: A developer needs to parse a JSON response body returned from an external REST API callout in Apex. Which approach is MOST common?
- Use JSON.deserialize() with a matching Apex class (Correct answer)
- Use XML.parse() to convert JSON to XML first
- Use Database.query() to parse JSON
- Use the XMLStreamWriter class
Correct answer: Use JSON.deserialize() with a matching Apex class
JSON.deserialize() (or JSON.deserializeUntyped()) maps the JSON response body to a matching Apex class or Map structure.
Question 3: Which governor limit applies specifically to the total number of callouts (HTTP requests and web service calls) per Apex transaction?
- 10
- 50
- 100 (Correct answer)
- 200
Correct answer: 100
Salesforce enforces a limit of 100 HTTP callouts per Apex transaction across both synchronous and asynchronous contexts.
Question 4: An external system sends a SOAP request to Salesforce. Which Salesforce endpoint type handles inbound SOAP web service calls?
- Apex REST Resource endpoint
- Apex SOAP Web Service class endpoint (Correct answer)
- Salesforce Bulk API endpoint
- Flow REST endpoint
Correct answer: Apex SOAP Web Service class endpoint
Global Apex classes with `webService` keyword methods generate a WSDL and receive inbound SOAP calls at a generated endpoint.
Question 5: What is the key difference between Platform Events and PushTopic Streaming events in Salesforce?
- Platform Events are synchronous; PushTopics are asynchronous
- Platform Events are custom event-driven objects; PushTopics are based on SOQL queries against standard/custom objects (Correct answer)
- Platform Events require a WSDL; PushTopics use REST
- Platform Events can only be consumed internally; PushTopics support external subscribers
Correct answer: Platform Events are custom event-driven objects; PushTopics are based on SOQL queries against standard/custom objects
Platform Events are custom objects defined in Setup for event-driven architecture, while PushTopics use SOQL queries to stream changes on existing sObjects.
Question 6: A developer is using Apex to call a SOAP web service defined by an external WSDL. What is the first step in this process?
- Write the SOAP XML body manually in Apex string
- Use the WSDL2Apex tool to generate Apex stub classes from the WSDL (Correct answer)
- Create a Named Credential pointing to the WSDL URL
- Use HttpRequest to POST raw SOAP XML
Correct answer: Use the WSDL2Apex tool to generate Apex stub classes from the WSDL
WSDL2Apex (in Setup > Apex Classes > Generate from WSDL) generates Apex stub classes from the external WSDL, enabling typed SOAP callouts.
Question 7: Which Integration pattern describes Salesforce initiating a request to an external system and waiting for the response before completing the transaction?
- Fire-and-Forget
- Request and Reply (Correct answer)
- Event-Driven
- Batch Data Sync
Correct answer: Request and Reply
Request and Reply is the synchronous integration pattern where Salesforce calls an external system and blocks until it receives the response.
PD1 Integration Architecture 5
When using the Salesforce Streaming API, what is the default message retention duration for PushTopic events?