Composite operations (multi-resource) in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a composite operation in REST APIs?

A composite operation is a single API call that performs multiple related actions on different resources together, often to simplify client interactions and ensure consistency.

beginner

Why use composite operations instead of multiple separate API calls?

Composite operations reduce network overhead, improve performance, and help maintain data consistency by grouping related changes into one atomic action.

intermediate

What does it mean for a composite operation to be atomic?

Atomic means that either all the changes in the composite operation succeed together, or if any part fails, none of the changes are applied, keeping data consistent.

intermediate

How can a REST API indicate success or failure of a composite operation?

The API returns a single response showing overall success or failure, often with details about each sub-operation's result to help clients understand what happened.

beginner

Give an example of a real-life scenario where composite operations are useful.

When creating a new user account, a composite operation can create the user profile, set permissions, and send a welcome email all in one API call.

What is the main benefit of composite operations in REST APIs?

A Reduce multiple calls into one for efficiency

B Make APIs more complex to use

C Separate unrelated actions into different calls

D Avoid using HTTP methods

Composite operations combine multiple related actions into a single call, improving efficiency.

What does atomicity mean in composite operations?

A Changes happen in any order

B Only the first change is applied

C All changes succeed or none do

D Partial success is allowed

Atomicity ensures all changes succeed together or none are applied to keep data consistent.

Which HTTP method is commonly used for composite operations?

A GET

B POST

C DELETE

D PATCH

POST is often used to submit composite operations because it can carry complex request bodies.

How does a composite operation help with network performance?

A By using only GET requests

B By sending multiple requests simultaneously

C By caching responses locally

D By reducing the number of requests sent

Composite operations reduce network calls by combining multiple actions into one request.

What should a client expect in the response of a composite operation?

A A single status for all actions combined

B Separate responses for each action in different calls

C No response at all

D Only error messages

The response usually includes an overall status and details about each sub-operation's result.

Explain what composite operations are and why they are useful in REST APIs.

Think about grouping multiple related actions into one API call.

Describe what atomicity means in the context of composite operations and why it matters.

Consider what happens if one part of the operation fails.