Learning Scala Web Development (Video 21)

The video tutorial explores caching in the Spray framework, focusing on the Spray Caching module and Spray Routing Directives. It discusses different caching strategies, including in-memory cache implementations like Simple LRU and Expiring LRU. The tutorial demonstrates caching in a book catalog API and highlights the importance of E-tags and conditional requests for efficient data handling. The video concludes by emphasizing the significance of caching in scalable web services and hints at future discussions on integrating external RESTful web services.

What is the primary focus of the Spray Caching module?

• Database management

• Data encryption

• Cache abstraction

• User authentication

Which policy does the Simple LRU Cache use to manage its entries?

• Most Recently Used

• Least Recently Used

• Last In, First Out

• First In, First Out

What additional feature does the Expiring LRU Cache support compared to the Simple LRU Cache?

• Data encryption

• User access control

• Time to live and time to idle expiration

• Data compression

What is the role of Spray Routing Directives in the context of caching?

• To facilitate caching and ETag support

• To manage user sessions

• To encrypt data

• To handle database transactions

How can caching be applied to a book catalog web service?

• By using a cache directive to store responses

• By storing user credentials in the cache

• By encrypting all book data

• By deleting all cached data regularly

What is the benefit of using ETags in web services?

• To allow multiple users to access data simultaneously

• To reduce unnecessary data transfer

• To ensure data is always encrypted

• To increase data size

What challenge is associated with maintaining cache consistency in web services?

• Keeping the cache in sync with actual data

• Reducing the size of the cache

• Allowing multiple users to access the cache

• Ensuring data is always encrypted