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Design Patterns and Best Practices in Java

You're reading from   Design Patterns and Best Practices in Java A comprehensive guide to building smart and reusable code in Java

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781786463593
Length 280 pages
Edition 1st Edition
Languages
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Authors (4):
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Kamalmeet Singh Kamalmeet Singh
Author Profile Icon Kamalmeet Singh
Kamalmeet Singh
Lucian-Paul Torje Lucian-Paul Torje
Author Profile Icon Lucian-Paul Torje
Lucian-Paul Torje
Sumith Kumar Puri Sumith Kumar Puri
Author Profile Icon Sumith Kumar Puri
Sumith Kumar Puri
Adrian Ianculescu Adrian Ianculescu
Author Profile Icon Adrian Ianculescu
Adrian Ianculescu
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Toc

Table of Contents (11) Chapters Close

Preface 1. From Object-Oriented to Functional Programming 2. Creational Patterns FREE CHAPTER 3. Behavioral Patterns 4. Structural Patterns 5. Functional Patterns 6. Let's Get Reactive 7. Reactive Design Patterns 8. Trends in Application Architecture 9. Best Practices in Java 10. Other Books You May Enjoy

Combining Observables


These are operators used to combine multiple Observables.

The combine operator

Combining the latest-emitted value from two or more Observables is done by calling one of these methods:

  • combineLatest: Emits an item that aggregates the latest values of each of the sources
  • withLatestFrom: Merges the given Observable into the current instance

The following example (runs forever) shows the result of combining two interval observables with different timespans–the first emits every 6 ms, the other every 10 ms:

The execution of the preceding code needs to be stopped by pressing Ctrl + C since it creates an infinite list. The output is as expected, it contains the combined values of both sequences based on the creating timestamp.

The join operator

Combining two Observables based on a given window can be done by calling one of the following methods:

  • join: Joins the items emitted by two Observables based on overlapping durations using an aggregation function
  • groupJoin: Joins the items emitted...
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