Event store concept in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an event in the event store.

Microservices

event = {"type": "UserCreated", "data": [1]

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

A[123, "Alice"]

B{"userId": 123, "name": "Alice"}

C"UserCreated"

D123

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list or string instead of a dictionary for event data.

The event data should be a dictionary containing relevant details, like userId and name.

2fill in blank

medium

Complete the code to append an event to the event store.

Microservices

event_store.append([1])

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Aevent

Bevent_store

Cevent.data

Devent.type

Attempts:

3 left

💡 Hint

Common Mistakes

Appending only event type or event data instead of the full event.

We append the whole event object to the event store, not just its type or data.

3fill in blank

hard

Fix the error in the code to read events from the event store.

Microservices

for [1] in event_store:
    print(event)

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Aevent

Bevents

Ce

Devent_store

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name in the loop and print statement.

The loop variable should be 'event' to match the print statement.

4fill in blank

hard

Fill both blanks to filter events of type 'OrderPlaced' from the event store.

Microservices

filtered_events = [event for event in event_store if event[1] [2] 'OrderPlaced']

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A.type

B==

C!=

D.data

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' or accessing wrong attribute.

We access the event's type attribute and check if it equals 'OrderPlaced'.

5fill in blank

hard

Fill all three blanks to create a dictionary of event counts by type.

Microservices

event_counts = [1](event.type for event in event_store if event.type[2] [3])

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ACounter

B!=

C'UserDeleted'

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '!=' for filtering, or missing Counter import.

We use Counter to count event types, filtering out 'UserDeleted' events.