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Learning Concurrency in Kotlin

You're reading from   Learning Concurrency in Kotlin Build highly efficient and scalable applications

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781788627160
Length 266 pages
Edition 1st Edition
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Author (1):
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Miguel Angel Castiblanco Torres Miguel Angel Castiblanco Torres
Author Profile Icon Miguel Angel Castiblanco Torres
Miguel Angel Castiblanco Torres
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Table of Contents (11) Chapters Close

Preface 1. Hello, Concurrent World! 2. Coroutines in Action FREE CHAPTER 3. Life Cycle and Error Handling 4. Suspending Functions and the Coroutine Context 5. Iterators, Sequences, and Producers 6. Channels - Share Memory by Communicating 7. Thread Confinement, Actors, and Mutexes 8. Testing and Debugging Concurrent Code 9. The Internals of Concurrency in Kotlin 10. Other Books You May Enjoy

Suspendable sequences and iterators

So far, we have discussed and implemented suspending functions in one way: as functions that suspend while waiting for the execution of one or more computations to happen. A simple representation of this is as follows:

In this example, getProfile starts its execution and, soon after, it suspends to wait for fetchProfile to execute. Once the response has been processed, getProfile suspends once more, this time to call calculateAge. When calculateAge finishes, the execution of getProfile continues until completion.

In this chapter, we will cover a different scenario: writing functions that are suspended between executions. For example, we can have a repository that is suspended until the next page is required:

In the previous example, the next() function will yield the first element from the data source, and will suspend immediately after returning...

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