Summary

This chapter has focused mainly on the practical usage of RxPHP in combination with typical non-reactive code, and presented a different approach to existing event-based solutions.

Specifically, we stumbled across Error handling in Observable chains with retry(), RetryWhen(), and catch() operators. We combined Observables with the concat(), merge(), and concatMap() operator. We used Subjects to dynamically create Observable chains and manually emit values. You were also given an introduction to the Symfony EventDispatcher component, with a series of examples presenting how the default EventDispatcher class that comes out of the box can be used. We extended and partially rewrote the EventDispatcher class and created ReactiveEventDispatcher, which adds support for Observables. And lastly, we reused examples for EventDispatcher with ReactiveEventDispatcher to demonstrate that our implementation can work as a drop-in replacement.

The Symfony EventDispatcher component serves as an easily...