Synchronous vs asynchronous communication in Microservices - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show a synchronous call between services.

Microservices

response = serviceA.call_serviceB([1])

Drag options to blanks, or click blank then click option'

Await_for_response

Bfire_and_forget

Csend_request_and_wait

Dpublish_event

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'fire_and_forget' which is asynchronous behavior.

In synchronous communication, the caller sends a request and waits for the response before continuing.

2fill in blank

medium

Complete the code to send an asynchronous message.

Microservices

message_queue.[1](event)

Drag options to blanks, or click blank then click option'

Apublish_event

Bsend_request_and_wait

Ccall_service

Dwait_for_response

Attempts:

3 left

💡 Hint

Common Mistakes

Using synchronous call methods instead of event publishing.

Publishing an event to a message queue is an asynchronous way to communicate between services.

3fill in blank

hard

Fix the error in the synchronous call to avoid blocking indefinitely.

Microservices

response = serviceA.call_serviceB(timeout=[1])

Drag options to blanks, or click blank then click option'

A-1

B0

CNone

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using None or zero which may cause indefinite blocking.

Setting a timeout (e.g., 30 seconds) prevents the caller from blocking forever if the service does not respond.

4fill in blank

hard

Fill both blanks to create an asynchronous event handler that processes messages.

Microservices

def handle_event(event):
    [1] = event.get('data')
    process([2])

Drag options to blanks, or click blank then click option'

Adata

Bevent_data

Devent

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causing undefined errors.

The handler extracts 'data' from the event and processes it asynchronously.

5fill in blank

hard

Fill all three blanks to implement a retry mechanism for synchronous calls.

Microservices

for attempt in range([1]):
    try:
        response = service.call()
        if response.status == [2]:
            break
    except [3]:
        continue

Drag options to blanks, or click blank then click option'

A3

B200

CTimeoutError

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using too many retries or wrong exception types.

Retry up to 3 times, break if HTTP 200 OK received, and catch timeout errors to retry.