Meet Snoop - A Discovery Service for Java EE @ JavaDayKiev 2015

Architectures based on microservices are increasing in popularity and the most common way of building them is as standalone applications using embedded container or no container at all. What we seem to forget is that microservices are not necessarily small or simple and we often end up creating the boilerplate infrastructure needed that we used to get from the container.

In this session I will show how you can use Java EE technologies to help cope with the inherent complexity of microservice-oriented architectures and thereby benefit from the full potential of the platform.

A common pattern when building systems based on distributed services is Service Discovery. And that is where Snoop comes in. It is a 100% Java EE alternative to Eureka. Just as simple and at least as powerful. And no need for 3rd party frameworks.

The slides for this session will be backed up by a demo to show key concepts and tools.
The demo will use core technologies of the Java EE platform, such as CDI Extensions, WebSockets, JAX-RS and even use MVC 1.0 (JSR 371).

Transcript

1. @ivar_grimstad JavaDay 2015 Meet Snoop Ivar Grimstad Principal Consultant, Cybercom Sweden JCP Expert Group Member (JSRs 368, 371, 375) A Discovery Service for Java EE
2. @ivar_grimstad JavaDay 2015 @ivar_grimstad https://github.com/ivargrimstad https://www.linkedin.com/in/ivargrimstad http://lanyrd.com/profile/ivargrimstad/
3. @ivar_grimstad JavaDay 2015 Agenda Service Discovery Snoop - a Discovery Service for Java EE
4. @ivar_grimstad JavaDay 2015 @EnableSnoopClient
5. @ivar_grimstad JavaDay 2015 Discovering Microservices
6. @ivar_grimstad JavaDay 2015 Monolithic Application
7. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Call A Call B Call C
8. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Discovery Service Register Register Register
9. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Discovery Service Register Register Register Lookup A Call A
10. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Discovery Service Register Register Register Lookup B Call B
11. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Discovery Service Register Register Register Lookup B
12. @ivar_grimstad JavaDay 2015 Introducing Snoop
13. @ivar_grimstad JavaDay 2015 Background
14. @ivar_grimstad JavaDay 2015 Inspired by Eureka
15. @ivar_grimstad JavaDay 2015 Service B Service A Service C Application Eureka Discovery Service Register Register Register @EnableEurekaClient Hardware Operating System JVM Service A Hardware Operating System JVM Service B Hardware Operating System JVM Service C
16. @ivar_grimstad JavaDay 2015 @SpringBootApplication @EnableEurekaClient public class Application { public static void main(String[] args) throws Exception { SpringApplication.run(Application.class, args); } }
17. @ivar_grimstad JavaDay 2015 Hardware Operating System JVM Service C Hardware Operating System JVM Service B Hardware Operating System JVM Service A Application Snoop Discovery Service Register Register Register Hardware Operating System JVM Java EE Container Service A Hardware Operating System JVM Java EE Container Service B Hardware Operating System JVM Java EE Container Service C @EnableSnoopClient
18. @ivar_grimstad JavaDay 2015 Hardware Operating System JVM Java EE Container Service A Hardware Operating System JVM Java EE Container Service C Hardware Operating System JVM Java EE Container Service B Application Snoop Discovery Service Register Register Register @EnableSnoopClient Hardware Operating System Service C Hardware Operating System JVM Service B Future<Snoop>
19. @ivar_grimstad JavaDay 2015 The Philosophy of Snoop
20. @ivar_grimstad JavaDay 2015 Lean Non-intrusive Intuitive Configurable
21. @ivar_grimstad JavaDay 2015
22. @ivar_grimstad JavaDay 2015 Snoop
 Service Registration
23. @ivar_grimstad JavaDay 2015 @EnableSnoopClient(serviceName="hello")
24. @ivar_grimstad JavaDay 2015 @EnableSnoopClient(name = "hello") @ApplicationPath("api") public class ApplicationConfig extends Application { }
25. @ivar_grimstad JavaDay 2015 Snoop
 Service Lookup
26. @ivar_grimstad JavaDay 2015 @Snoop(serviceName="hello")
27. @ivar_grimstad JavaDay 2015 @Inject @Snoop(serviceName = "hello") private SnoopServiceClient helloService;
28. @ivar_grimstad JavaDay 2015 Snoop Service Consumption
29. @ivar_grimstad JavaDay 2015 SnoopServiceClient
30. @ivar_grimstad JavaDay 2015 @Inject @Snoop(serviceName = "hello") private SnoopServiceClient helloService;
31. @ivar_grimstad JavaDay 2015
32. @ivar_grimstad JavaDay 2015 String helloResponse = helloService.simpleGet("hello") .filter(r -> r.getStatus()==200) .map(r -> r.readEntity(String.class)) .orElse("goodbye");
33. @ivar_grimstad JavaDay 2015 Snoop Configuration
34. @ivar_grimstad JavaDay 2015 System Properties Environment Variables Application Configuration (snoop.yml)
35. @ivar_grimstad JavaDay 2015 snoop.yml snoop: host: http://localhost port: 8080 serviceRoot: snoop-hello-service/api snoopService: 192.168.59.103:8081/snoop-service/
36. @ivar_grimstad JavaDay 2015 The Snoop Protocol
37. @ivar_grimstad JavaDay 2015 Service A Service B Service C Application Snoop Discovery Service Call Call Call Lookup http:// Register ws:// Register ws:// Register ws://
38. @ivar_grimstad JavaDay 2015 Is Snoop a Load Balancer?
39. @ivar_grimstad JavaDay 2015 Service A1 Service A2 Service C Application Snoop Discovery Service Register Register Lookup Call Call Load Balancer
40. @ivar_grimstad JavaDay 2015 DEMO !
41. @ivar_grimstad JavaDay 2015 Hello World Bzzz Hello World Snoop Discovery Service Register Register Register Payara 4.1 Docker + GlassFish 4.1 Docker + WildFly 9 Docker + WildFly 8 WildFly Swarm Lookup Call Call Call
42. @ivar_grimstad JavaDay 2015 Hello World Bzzz Hello World Snoop Discovery Service Register Register Register Payara 4.1 Docker + GlassFish 4.1 Docker + WildFly 9 Docker + WildFly 8 WildFly Swarm Lookup Call Call Call
43. @ivar_grimstad JavaDay 2015 Summary
44. @ivar_grimstad JavaDay 2015 Getting Started with Snoop
45. @ivar_grimstad JavaDay 2015 1. Add Maven Dependency <dependency> <groupId>eu.agilejava</groupId> <artifactId>snoop</artifactId> <version>${snoop.version}</version> </dependency> <dependency> <groupId>eu.agilejava</groupId> <artifactId>snoop</artifactId> <version>1.3.0</version> </dependency>
46. @ivar_grimstad JavaDay 2015 2. Snoop-Enable the Service @EnableSnoopClient(serviceName="hello")
47. @ivar_grimstad JavaDay 2015 3. Configure the Service snoop: host: http://localhost port: 8080 serviceRoot: snoop-hello-service/api snoopService: 192.168.59.103:8081/snoop-service/
48. @ivar_grimstad JavaDay 2015 4. Configure the Application snoop: snoopService: 192.168.59.103:8081/snoop-service/
49. @ivar_grimstad JavaDay 2015 Sources https://github.com/ivargrimstad/snoop https://github.com/ivargrimstad/snoop-samples https://hub.docker.com/u/ivargrimstad
50. @ivar_grimstad JavaDay 2015 @EnableSnoopClient
51. @ivar_grimstad JavaDay 2015 cybercom.com