Effective Akka by Jamie Allen

Author:Jamie Allen
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Software Development & Engineering / Tools
ISBN: 9781449360023
Publisher: O’Reilly Media
Published: 2013-08-15T16:00:00+00:00

Pre-defining Parallel Futures

The Scala Future API allows us to pre-define work and then stage the way that work is handled via nested Future instances. If you want to create a pair of futures to run in parallel, you do so independently and then use a for comprehension to handle the results. However, this only works when the results are unrelated and not dependent on one to complete before the next can be handled.

For example, imagine we wanted to display information on a stock trading web page. The customer has selected the security she wishes to purchase. We need to find out the current bid, ask prices, find out the price the security trade for last, and then return that to the view layer to be composed into a response and returned to the customer. We first define the Future instances to get both pieces of information, and then we define the behavior for handling the results:

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