Scala for the Impatient, 3rd Edition

Chapter 16. Futures

Topics in This Chapter A2

• 16.1 Running Tasks in the Future

• 16.2 Waiting for Results

• 16.3 The Try Class

• 16.4 Callbacks

• 16.5 Composing Future Tasks

• 16.6 Other Future Transformations

• 16.7 Methods in the Future Object

• 16.8 Promises

• 16.9 Execution Contexts

• Exercises

Writing concurrent applications that work correctly and with high performance is very challenging. The traditional approach, in which concurrent tasks have side effects that mutate shared data, is tedious and error-prone. Scala encourages you to think of a computation in a functional way. A computation yields a value, sometime in the future. As long as the computations don’t have side effects, you can let them run concurrently and combine the results when they become ...