Building Reactive Apps

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" summary

Reactive apps use async non‑blocking I/O end to end: demo builds a Play (Java 8) app with Typesafe Activator, uses Play + Netty for Java NIO, returns Promise/Future results, delays with a single timer thread, and composes parallel WS calls (james.com + twitter.com) with map/flatMap so threads free up while waiting. Actor example uses Akka actors (actorRef, ask, patterns.pipe, routers like scatter‑gather‑first‑complete) to manage mutable state and retries. Mentions JVM 1MB thread stacks, aiming for threads ≈ CPU cores, millions of actors, and Reactive Streams for nonblocking backpressure.

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" chapters (15)

1. 0:00Introduction
2. 0:44What is Reactive
3. 2:30Reactive Web
4. 5:27Async Nonblocking
5. 8:20Typesafe Activator
6. 10:11Play
7. 15:53Delayed timeout
8. 19:54Promises
9. 21:12Web Service Call
10. 32:00WS API
11. 34:29Demo
12. 40:40Code
13. 47:21Routers
14. 47:46Reactive Streams
15. 49:51Questions

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