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Rest no more - Using actors for the internet of (Lego) trains & Raspberry Pi's
- 2. REST NO MORE USING ACTORS FOR THE INTERNET OF (LEGO) TRAINS & RASPBERRY PI’S Johan Janssen, Info Support @johanjanssen42
- 3. Disclaimer: No Lego was harmed beyond repair during the project.
- 5. CONTENT Why? Getting started Architecture Actors Remote actors Shared protocol HTTP vs Actors Conclusion Challenges Questions
- 6. WHY?
- 7. Why?
- 10. MINIMAL INGREDIENTS FOR 1TRAIN ABOUT € 50 Raspberry Pi A+ / Raspberry Pi Zero Wifi dongle EDUP Ultra-Mini Nano USB 2.0 802.11n USB battery pack Anker® 2. Gen Astro Mini 3200mAh Infrared transmitter Keyes 38KHz IR InfraredTransmitter Module for Arduino
- 12. COMPARISON Idle (mA) Memory (MB) CPU (Mhz) Size (mm) RPi A+ 100 256 700 65 *56 RPi Zero 100 512 1000 65 * 30 RPi B+ 200 512 700 85 *56 RPi 2 B 230 1024 4*900 85 *56 Particle Photon 80-100 128KB 120 38 * 21
- 13. ARCHITECTURE
- 14. Architecture
- 16. LTCC (Angular) LTCC (Scala/Akka) DeviceControl (Scala/Akka) Infrared (C and LIRC) RFID (C) SwitchControl (Scala/Akka) Servo (Python) Leds with Photon (C) RPi-Cam-Web- Interface (C)
- 17. LTCC (Laptop / Pi) LegoTrain SwitchControl (Pi) Camera (Pi) Device Control (Pi)
- 19. Infrared
- 20. Sound
- 22. Camera
- 24. Switches
- 28. LTCC APPLICATION
- 29. ACTORS
- 30. AKKA ACTORS class Worker extends Actor { def receive = { case x => println(x) } } val system = ActorSystem("ExampleActorSystem") val workerActorRef = system.actorOf(Props[Worker]) workerActorRef ! "Hello conference"
- 31. REMOTE ACTORS
- 33. AKKA REMOTE ACTOR CALL val workerActorRef = system.actorOf(Props[Worker]) val workerActorRef = system.actorSelection("akka.tcp:// ExampleActorSystem@127.0.0.1:9005 /user/workerActor")
- 34. AKKA REMOTE ACTOR CONFIGURATION akka { actor { provider = "akka.remote.RemoteActorRefProvider" } remote { enabled-transports = ["akka.remote.netty.tcp"] netty.tcp { hostname = "127.0.0.1" port = 9002 } } }
- 35. SHARED PROTOCOL
- 36. Actor on JVM 1 Actor on JVM 2 Messages
- 37. Actor on laptop Musicservice Actor on Raspberry PiPlay message CONCRETE EXAMPLE
- 39. EXAMPLE MESSAGE object MusicServiceMessage { case class Play(filename: String) case class MusicList(filenames: List[Song]) }
- 40. MESSAGE USED BY APPLICATION val actorRef = context.actorSelection( "akka.tcp://[Actorsystem]@ [IP]:[port]/user/musicservice") actorRef ! [packagename].MusicServiceMessage.Play(filename)
- 41. HTTP VS REMOTE ACTOR
- 42. ADVANTAGES REMOTE ACTORS No converting to JSON/SOAP More natural programming Concurrent on default Built-in load balancer Built-in circuit breaker
- 43. ADVANTAGES HTTP Indepedent of technology Loosely coupled
- 44. FAT JAR (SBT ASSEMBLY) IN MB 0 5 10 15 20 25 Local actor Remote actor Akka HTTP Spring boot
- 45. GATLING
- 46. class ExampleSimulation extends Simulation { val scn = scenario("My scenario").repeat(100) { exec( http("Ping") .get("http://localhost:8080/ping") .check(status.is(200)) ).pause(100 millisecond) } setUp(scn.inject( rampUsers(1000) over (10 seconds) // Changing )) }
- 47. PERFORMANCETEST SETUP JVM 1 Akka HTTP HTTP: /ping pong JVM 2 Akka HTTP HTTP: /pong pong JVM 1 Akka HTTP HTTP: /ping pong JVM 2 Akka remote actor Akka over TCP: pong pong
- 48. 0 10 20 30 40 50 60 50 500 1000 Mean response time (ms) Akka HTTP Remote actor
- 49. 0 100 200 300 400 500 600 700 800 900 50 500 1000 Max response time (ms) Akka HTTP Remote actor
- 50. GRADUATION STUDENT REST could handle around 600 users Remote actors probably around 3300 users
- 51. REST is dead, long live remote actors! - Johan Janssen
- 53. 0 2 4 6 8 10 12 50 500 1000 Mean response time (ms) Remote actor Spring boot
- 54. 0 50 100 150 200 250 50 500 1000 Max response time (ms) Remote actor Spring boot
- 55. Challenges
- 66. DO ITYOURSELF https://github.com/johanjanssen/ LCC LCCInstallScript
- 67. CONCLUSION
- 68. The best part!!
- 69. QUESTIONS? Johan Janssen, Info Support @johanjanssen42 Johan.Janssen@infosupport.com
Editor's Notes
- You can also make it a bit bigger with camera, RFID, speaker
- You could use a Zero or Particle Photon if you only need an IR transmitter. But for video it’s a bit more difficult to use those. Bigger is better for development speed. Smaller is better to put it in a train.
- This is the test setup for the performance test JVM1 is the frontend, receives http request from client JVM1 sends a request to JVM2 for some further info, after reply from JVM2 it responds to the client. Top is over HTTP Bottom is using Akka remote actors over TCP.
- Documentation Raspberry USB connector/burned Hardware resources To small children Time
- Limited resources although quite a lot with the Raspberry Pi. This HD only has 72 MB
- Broken Raspberry Pi USB connector on A+
- Lego quite picky with batteries, empty batteries. No easy/cheap way to charge Lego battery box.
- RFID only works when nearby and when moving slowly
- WIFI issues
- No plug and play
- Lots of options: Raspbian/Arch. Docker, documentation, support, hardware
- Documentation, wiring etc.
- To small children
- Not enough time
- Sum up Play with lego;s like kids Show and tells for grownups Testdrive akka, experience Come to Jfokus in beaty stockholm … That’s not even the best part. The best part is … Ervaring opgedaan met hardware/IoT Java en Scala/Akka werken blijkbaar prima - Marketing stands op conferenties Scala/Akka ervaring REST vs Remote Actors Ons hier gebracht