Un recorrido sobre Java EE 8 y Eclipse MicroProfile para la creación de microservicios

1. Eclipse MicroProfile para el desarrollador ocupado
Jorge Cajas - V´ıctor Orozco
11 de Abril de 2019
@cajasmota - @tuxtor
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2. Java EE - MicroProfile - Spring Boot - Docker
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3. ¿Microservicios?

4. ¿Microservicios?
¿Necesito migrar todo a microservicios? ¿Que pasa
si no utilizo microservicios? ¿Me estoy volviendo
viejo?
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5. Reactive applications
Aplicaciones reactivas
Microservicios son una (de muchas) herramienta para creaci´on de
aplicaciones reactivas
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6. Monolito - Escalabilidad
Figura 1: Mon´olito
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7. ESB
Figura 2: ESB
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8. Microservicios
Figura 3: Microservicios
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9. Java EE 8

10. Java EE 8
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11. Java EE 8
Java EE 8
• Integraci´on JSF-CDI
• Integraci´on JMS-CDI
• HTTP/2
• JSON-B
• Security
• JAX-RS Reactivo
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12. Java EE 8 - Comunidad Java EE
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13. Eclipse MicroProfile

14. Eclipse MicroProfile
Figura 4: Credito: Reza Rahman
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15. Eclipse MicroProfile
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16. Eclipse MicroProfile
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17. Eclipse MicroProfile - Implementaciones
Bibliotecas
• SmallRye (Red Hat)
• Hammock
• Apache Geronimo
• Fujitsu Launcher
JEAS - Fat Jar
• Dropwizard
• KumuluzEE
• Helidon (Oracle)
• Open Liberty (IBM)
• Apache Meecrowave
• Thorntail (Red Hat)
• Quarkus (Red Hat)
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18. Eclipse MicroProfile - Implementaciones
Micro server
• Payara Micro
• TomEE Plume
Full server
• Payara Application Server
• JBoss Application Server / Wildfly Application Server
• WebSphere Liberty (IBM)
https://wiki.eclipse.org/MicroProfile/Implementation
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19. Eclipse MicroProfile on Payara 5
<dependency >
<groupId >org.eclipse.microprofile </ groupId >
<artifactId >microprofile </ artifactId >
<type >pom </type >
<version >2.0.1 </ version >
<scope >provided </scope >
</dependency >
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20. Config
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21. Config
@Inject
@ConfigProperty(name = "omdbservice.url")
String omdbDaemonServiceUrl ;
Ext. de la configuraci´on (VM, Docker, Kubernetes)
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22. Fault Tolerance
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23. Metrics
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24. Fault Tolerance + Metrics
• Fault Tolerance depende de la existencia de metricas, las
metricas se exponen mediante Metrics
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25. Fault tolerance
Reglas de evaluaci´on y alternativas
• Circuit Breaker
• Bulkhead
• Retry
• Timeout
• Fallback
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26. Fault tolerance - Fallback, Timeout
@GET
@Path("/{id:[a-z]*[0 -9][0 -9]*}")
@Fallback(fallbackMethod = "findByIdFallBack")
@Timeout(TIMEOUT)
public Response findById(@PathParam("id")
final String imdbId) {
...
}
public Response findByIdFallBack (@PathParam("id")
final String imdbId) {
...
}
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27. M´etricas
• JSON or OpenMetrics (Prometheus)
• Vendor
• Base
• Application
¿Cuales?
• Counted
• Gauge
• Metered
• Timed
• Histogram
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28. Metrics - Counted
@Inject
@Metric
Counter failedQueries;
@GET
@Path("/{id:[a-z]*[0 -9][0 -9]*}")
@Fallback(fallbackMethod = "findByIdFallBack")
@Timeout(TIMEOUT)
public Response findById(@PathParam("id")
final String imdbId) {
...
}
public Response findByIdFallBack (@PathParam("id")
final String imdbId) {
...
failedQueries.inc();
}
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29. Metrics - Gauge
Inc-dec en tiempo real
@Gauge(unit = "ExternalDatabases",name = "movieDatabases", absolute
= true)
public long getDatabases () {
return 99; //Any value
}
/metrics/application/movieDatabases
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30. Metrics - Metered
Events rate
@Metered(name = " moviesRetrieved ",
unit = MetricUnits.MINUTES ,
description = "Metrics to monitor movies",
absolute = true)
public Response findExpandedById (
@PathParam("id") final Long id)
/metrics/application/movieDatabases
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31. Metrics- Timed
Desempe˜no y retraso
@Timed(name = "moviesDelay",
description = "Time to retrieve a movie",
unit = MetricUnits.MINUTES ,
absolute = true)
public Response findExpandedById (
@PathParam("id") final Long id)
/metrics/application/moviesDelay
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32. Metrics - Histogram
Distribuciones
@Inject
MetricRegistry registry;
@POST
@Path("/add/{ attendees}")
public Response addAttendees(
@PathParam("attendees") Long attendees) {
Metadata metadata =
new Metadata("matrix attendees",
MetricType.HISTOGRAM );
Histogram histogram =
registry.histogram(metadata );
histogram.update(attendees );
return Response.ok(). build ();
}
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33. Health Check
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34. Health Check
¿Estas vivo?
@Override
public HealthCheckResponse call () {
return HealthCheckResponse .named("TaVivoAinda")
.withData("key1", "val1")
.withData("key2", "val2")
.up()
.build ();
}
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35. JWT
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36. JWT
@LoginConfig(authMethod = "MP-JWT")
public class ApplicationConfig extends Application {
}
@Inject
private JsonWebToken jwtPrincipal;
@Inject
@Claim("email")
private String email;
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37. TypeSafe
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38. TypeSafe
@Path("/playlist")
@Consumes("application/json")
public interface MusicPlaylistService {
@GET
List <String > getPlaylistNames ();
@PUT
@Path("/{ playlistName}")
long updatePlayList(@PathParam("playlistName")
String name ,
List <Song > playlist)
throws UnknownPlaylistException ;
}
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39. Demo

40. EE + MicroProfile - Demo
Java 8, JAX-RS, CDI, EJB,
MicroProfile
https://github.com/tuxtor/payara-demo
https://github.com/tuxtor/omdb-demo
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41. Payara Micro - Java EE 8
Stacks tradicionales
• EJB
• JTA
• JAX-RS
• CDI
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42. EE + MicroProfile - Demo
MicroProfile: JAX-RS, CDI, Config, Fault Tolerance, Metrics
Payara Micro: EJB, JTA
Fatores externos: Location, Deployment, Orchestation, Balancing, Consistency
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43. 12 factores cloud native (Heroku)
Microprofile
• Config
• Backing service
• Disposability
Cloud
• Codebase (Git-Flow)
• Dependencies (Maven)
• Build, Release, Run
• Processes (Pipelines)
• Port binding
• Concurrency (Docker - k8s)
• Dev / Prod parity
• Logs
• Admin process
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44. Oracle Cloud
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45. Oracle Cloud
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46. Oracle Cloud
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47. Oracle Cloud
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48. V´ıctor Orozco
• me@vorozco.com
• @tuxtor
• http://vorozco.com
• http://tuxtor.shekalug.org
This work is licensed under a
Creative Commons
Attribution-ShareAlike 3.0.
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