Akka-streams & Akka-http: Building Reactive Apps

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Introduction to Akka-streams and Akka-http. We show how simple it becomes to build an application that streams geolocated events in a time-consistent way on a websocket, with back-pressure propagated to the upstream. Code can be found at https://github.com/pierangeloc/reactive-earthquakes

Technology

Akka-streams & Akka-http
Pierangelo Cecchetto
Java/Scala developer @
@pierangelocecc
https://github.com/pierangeloc

Akka-streams & Akka-http
- Akka
- Akka-streams
- Akka-http
- Examples and code

Akka
Akka 101
● Toolkit to build concurrent apps
● “ “ “ distributed “
● Actors can be created/disposed at will
● Small memory footprint
● Hierarchical failure / supervision management
supervises

Akka
● Actors’ mailbox can be unbounded or bounded but dropping
● Actors interaction: can be complex
● Message passing === messages flow
● Messages are handled in an untyped fashion*
* This is being addressed with Typed Actors
Akka

Akka-Streams:
- Sequence of ephemeral elements
- Possibly unbounded
- Can be transformed/mapped
- Immutable, reusable, shareable
- Use bounded buffers
- Compose to build complex streams
- Explicit materialization of a blueprint
Akka-streams

Akka-streams
Akka-streams foundations / 1
Actors based
Synthesized by actors

Akka-streams
Flow Transformations
⇒
⇒
⇒
⇒

Flow Transformations
⇒
⇒
⇒
⇒
Flow Composition
- Graph builder
- Fan in
- , ,
- Fan out
- ,
Akka-streams

Akka-streams
Materialization: Simple example

Akka-streams
Materialization: Simple example
Concisely:

Akka-http
- Streams: back-pressure & buffers

Akka-http
- Streams: back-pressure & buffers
- TCP: back-pressure & buffers

Akka-http
- Streams: back-pressure & buffers
- TCP: back-pressure & buffers
- Streams everywhere:

Akka-http
- Streams: back-pressure & buffers
- TCP: back-pressure & buffers
- Streams everywhere:
Think in Streams!

Akka-http
Thinking in Streams
example: Stream earthquakes events on a websocket

Earthquakes replay
Earthquakes stream
websocket

Earthquakes replay
- Data transformation

Earthquakes replay
- Data transformation
- Rate transformation

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Akka-streams & Akka-http: Building Reactive Apps

1. Akka-streams & Akka-http Pierangelo Cecchetto Java/Scala developer @ @pierangelocecc https://github.com/pierangeloc

2. Akka-streams & Akka-http - Akka - Akka-streams - Akka-http - Examples and code

3. Akka Akka 101 ● Toolkit to build concurrent apps ● “ “ “ distributed “ ● Actors can be created/disposed at will ● Small memory footprint ● Hierarchical failure / supervision management supervises

4. Akka ● Actors’ mailbox can be unbounded or bounded but dropping ● Actors interaction: can be complex ● Message passing === messages flow ● Messages are handled in an untyped fashion* * This is being addressed with Typed Actors Akka

5. Akka-Streams: - Sequence of ephemeral elements - Possibly unbounded - Can be transformed/mapped - Immutable, reusable, shareable - Use bounded buffers - Compose to build complex streams - Explicit materialization of a blueprint Akka-streams

6. Akka-streams Akka-streams foundations / 1 Actors based Synthesized by actors

7. Akka-streams Tools of the trade

8. Akka-streams Flow Transformations ⇒ ⇒ ⇒ ⇒

9. Flow Transformations ⇒ ⇒ ⇒ ⇒ Flow Composition - Graph builder - Fan in - , , - Fan out - , Akka-streams

10. Akka-streams Basic composition

11. Akka-streams Materialization: Simple example

12. Akka-streams Materialization: Simple example Concisely:

13. Akka-http - Streams: back-pressure & buffers

14. Akka-http - Streams: back-pressure & buffers - TCP: back-pressure & buffers

15. Akka-http - Streams: back-pressure & buffers - TCP: back-pressure & buffers - Streams everywhere:

16. Akka-http - Streams: back-pressure & buffers - TCP: back-pressure & buffers - Streams everywhere:

17. Akka-http - Streams: back-pressure & buffers - TCP: back-pressure & buffers - Streams everywhere: Think in Streams!