June 2015
Intermediate to advanced
182 pages
3h 56m
English
Content preview from Learning Reactive Programming With Java 8Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. Combinators, Conditionals, and Error Handling
Most of the programs that we write handle data from different sources. These sources can be both external (files, databases, servers, and many others) and internal (different collections or branches of the same external source). There are many cases in which we'll want to have these sources depend on each other in one way or another. Defining these dependencies is a necessary step in building our programs. The idea of this chapter is to introduce the Observable operators capable of that.
We saw an example of combined Observable instances in the first and second chapters. Our "Reactive Sum" program had one external data source—the user input but it branched it into two internal data sources, ...
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