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How to Thrive on REST/WebSocket-Based Microservices
The document discusses microservices architecture, emphasizing the benefits of small, decoupled applications that utilize Java SE 8, JAX-RS, and WebSocket technologies. It highlights the efficiency and quick startup times of small applications compared to traditional monolithic architectures. Additionally, it mentions the importance of feedback for improving training sessions and provides contact information for further inquiries.
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How to Thrive on REST/WebSocket-Based Microservices
- 3. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 3 Classroom Training Learning SubscripFon Live Virtual Class Training On Demand Keep Learning with Oracle University educa7on.oracle.com Cloud Technology ApplicaFons Industries
- 4. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Session Surveys Help us help you!! • Oracle would like to invite you to take a moment to give us your session feedback. Your feedback will help us to improve your conference. • Please be sure to add your feedback for your aQended sessions by using the Mobile Survey or in Schedule Builder. 4
- 5. How to Thriveon REST/ WebSocket-based Microservices Pavel Bucek (pavel.bucek@oracle.com) Michal Gajdoš (michal@sapho.com) Oracle/Sapho October 27, 2015 Copyright © 2015, Oracle and/or its affiliates. All rights reserved. |
- 6. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The following is intended to outline our general product direcFon. It is intended for informaFon purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or funcFonality, and should not be relied upon in making purchasing decisions. The development, release, and Fming of any features or funcFonality described for Oracle’s products remains at the sole discreFon of Oracle. 6
- 7. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | IntroducFon 7
- 8. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Why are we doing this? • Proof of concept – Micro is the new black – Very small runFme can deliver key funcFonality • JAX-‐RS (Jersey) + WebSocket (Tyrus) • Java SE 8 adopFon • ReacFve APIs 8
- 9. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | What’s already there? • Vert.x • Dropwizard – JeQy, Jersey, Jackson, … – No WebSocket • Glassfish / Payara – JAX-‐RS, WebSocket, Servlet, JSF, BV, CDI, … – ~60MB 9
- 10. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | QUESTION Typical produc7on deployment in my company is: Micro-‐service (small containers, dynamic up/down scaling) Monolithic applicaFon (big containers, staFc resources, acFve/ passive backup) CombinaFon of previous A B C 10
- 11. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Sample applicaFon • Simple poll – Jersey MVC • Results are updated based on new votes – WebSocket connecFon (could be SSE..) • Simple filtering (websocket based) – InteracFve part of the app – WebSocket are more efficient to use 11
- 12. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | DEMO How does the Survey app works? 12
- 13. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | QUESTION Which Java framework do you use in produc7on? Java EE 6+ Spring Java EE 5 (and older) + Java SE Something else, text us what! A B C 13 D
- 14. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | DEMO +CDI 14
- 15. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | QUESTION Do you use WebSocket in produc7on? Yes. Not yet, but we plan to. No (we don’t need bi-‐direcFonal communicaFon). No (we use something else). A B C 15 D
- 16. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Micro-‐services • Simple, small, decoupled standalone “applicaFons” – They don’t do (and provide) anything else than they should – Easy to develop and test • Fast startup Fme, Fault tolerant – Dynamic scaling – CaQle vs Pet 16
- 17. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | <<Placeholder>> 17
- 18. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | <<Placeholder>> • Grizzly – HTTP container • HK2 – Dependency InjecFon • Tyrus – WebSocket RI • Jersey – JAX-‐RS RI 18
- 19. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | DEMO <<Placeholder>> 19
- 20. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | QUESTION Executable JAR size (<<Placeholder>> + poll app) is: ~100 MB ~50 MB ~20 MB ~10 MB ~5 MB A B C 20 D E
- 21. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Summary • Glassfish – Footprint: >200 M – Startup Fme: ~10 s • JeQy + Weld – Footprint: ~28 M – Startup Fme: ~5 s • <<Placeholder>> – Footprint: ~11 M – Startup Fme: ~1s 21
- 22. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | What do we miss? 22
- 23. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Java 8 + ReacFve APIs • Lots of new features in Java 8 • Frameworks slowly up-‐taking new APIs • OpFonal, Lambdas, Streams, … • ReacFve APIs are very handy when you are accessing more services – You don’t need to wait (block) for the answer – Processing hooked to “response(s) received” 23
- 24. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | QUESTION Java version in produc7on: Java 5 (and older) Java 6 Java 7 Java 8 Java 9 (for cuwng-‐edge enthusiasts) A B C 24 D E
- 25. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | OpFonal in Jersey • Server – Incoming enFFes – Return values (Outgoing enFFes) – @*Param values • Client – Outgoing enFFes 25
- 26. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | OpFonal in Jersey 26
- 27. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | OpFonal in Jersey 27
- 28. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ReacFve Client API in Jersey/JAX-‐RS 2.1 • UFlize the reacFve programming model when using Jersey/JAX-‐RS Client • Already in Jersey – Java 8 – CompleFonStage – RxJava – Guava • Will be in JAX-‐RS 2.1 28
- 29. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ReacFve Client API – Jersey & RxJava 29
- 30. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ReacFve Client API – JAX-‐RS 2.1 & CompleFonStage 30
- 31. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ProgrammaFc Resources in Jersey 31
- 32. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Lambdas in Tyrus • Endpoint is just a set of lambda funcFons – @OnOpen, @OnMessage, @OnError, @OnClose – WebSocket API already has programmaFc version in the specificaFon – see javax.websocket.Endpoint • It can be applied to server side as well – AnnotaFon way is o{en preferred for server-‐side deployment – Easier to read + integrate with other frameworks (DI, ..) 32
- 33. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Lambdas in Tyrus 33
- 34. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Lambdas in Tyrus 34
- 35. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Lambdas in Tyrus 35
- 36. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Streams in Tyrus • Stream processing is another bigger and more notable feature of the Java 8 • MessageHanders (in general -‐ any event handler) can be modeled as endless stream – there are some issues with “terminators”, but that could be solved -‐ terminator would unregister current “message handler”; push vs pull.. – streams can easily: filter, map (encode/decode) 36
- 37. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Contacts • Pavel Bucek (pavel.bucek@oracle.com) • Michal Gajdoš (michal@sapho.com) Github repo: hQps://github.com/pavelbucek/placeholder • Jersey – hQp://jersey.java.net • Tyrus – hQp://tyrus.java.net 37
- 38. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Q & A 38
- 39. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 39
- 40. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 40