Chapter 10: Practical Concurrency

1. Can you name two mechanisms for executing code in the background for JVM applications?

• Thread
• Executors
• CompleteableFuture
• RxJava

2. When was CompleteableFuture introduced to Java?

• Java 8

3. What is RxJava?

• It is the JVM implementation of Reactive Streams, which can be used for simple asynchronous operations or for fully reactive programming.

4. What are coroutines?

• They are a solution for structured concurrency that enable us to write asynchronous code in an imperative, non-blocking way.

5. What is structural concurrency?

• It is the concept of scoping coroutines and their execution to different scopes that can be controlled and canceled throughout the lifetime of an application.

6. Why are different coroutine builders useful?

• They enable us to control how our coroutines are configured, run, and responded to. They could be used to bridge non-blocking and blocking portions of our code base, or to control the scopes in which our coroutines are associated.

7. What are suspending functions?

• They are functions with the suspend function added to their declaration, which indicates that the function can suspend the operation of a coroutine. They can be used to write functions that perform long-running tasks that can then be called from within a coroutine.