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CON6423: Scalable JavaScript applications with Project Nashorn
The document discusses the advantages of using JavaScript on the server, particularly with the Nashorn engine and JVM, emphasizing benefits such as asynchronous processing, JSON support, and the integration of the Java ecosystem. It covers event-driven and microservice architectures, highlights the Vert.x framework, and introduces the Avatar.js project, which aims to replicate Node.js functionalities in the Java environment. Challenges faced include documentation and community support, and the document provides benchmarks comparing performance metrics across different technologies.
CON6423: Scalable JavaScript applications with Project Nashorn
- 1. Scalable JavaScript applications with Project Nashorn
- 2. Speakers Leonardo Zanivan Software Architect, Trier Sistemas github.com/panga @leonardopanga Michel Graciano Software Architect, Betha Sistemas github.com/mgraciano @mgraciano
- 3. Agenda ● WhyJS in the server ● Why the JVM ● Nashorn ecosystem ● Vert.x and Avatar/Avatar.js ● Q&A
- 4. Why JS inthe server ● Asynchronous by nature ● Native JSON support ● Language reuse ● Easier developer transition
- 5. Why the JVM ● Multilanguage ● APM Tools ● Access to the Java ecosystem ○ Domain models already implemented ○ Java EE ○ Core and third parties Java libraries
- 6. Nashorn ● JDK8 Compact 1 Profile with extension ● Restrictions (browsers API, DOM) ● No native CommonJS implementation ● ECMA 5.1 + Rhino compatibility ● jjs interactive command line tool
- 14. Nashorn ● JDK8u20 ○ JDK-8032068: sourceURL directives ○ JDK-8021350: Share script classes between threads/globals ● JDK 8u40 ○ JEP 196: Nashorn Optimistic Typing ○ JEP 202: Nashorn Class Filter ○ JEP 203: Initial ES6 implementation (const & let) ● JEP 194: Nashorn Code Persistence (lazy compilation)
- 15. But how toscale it?
- 16. But how toscale it? Architectures and Technologies
- 17. Event-driven architecture ●Event-loops ● Async non-blocking IO ● Reactive system ● Event bus
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- 19. Microservice architecture ●Focused on specific business ● Well defined & distributed ● Loosely coupled ● Testable ● Scalable
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- 21. Vert.x ● http://vertx.io/ ● Based on Netty ● Sponsored by Red Hat ● Winner of JAX Innovation Awards 2014 @timfox: Writing Highly Concurrent Polyglot Applications with Vert.x [CON7902] Thursday, Oct 2, 11:30 AM
- 22. Vert.x ● Keybenefits ○ Polyglot ○ Event bus (async & worker verticles) ○ Create reactive applications ○ Microservices ready ○ Strong community involvement
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- 24. Vert.x ● Keybenefits ○ Easy deployment ■ CLI, API, mods, runtime deps resolution ○ Good build tools support (fat jar, auto-redeploy) ○ Native Cluster & HA with Hazelcast ○ Tons of extensions available
- 25. Vert.x ● Challenges ○ Updated documentation ○ Verticle monitoring ○ Limited transactions support ○ Doesn’t have distributed maps yet (2.x) ○ Nashorn debugging support (PR to be merged)
- 26. Vert.x ● Vert.x3 highlights ○ JDK 8+ with Nashorn & Lambda ○ No more module system* ○ Clustered shared data ○ Event bus proxies & codecs ○ Ext stack (MongoDB, SockJS, Route, Rx)
- 27. Demo ● Real-timenotification service using websockets over nashorn integrating with a legacy Java EE app
- 28. Avatar.js ● https://avatar-js.java.net ● Oracle sponsored ● Focus on bringing the node programming model, APIs and module ecosystem to the Java platform
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- 30. Avatar ● https://avatar.java.net ● Oracle sponsored ● Focus on Thin Server Architecture ○ Supports REST, WebSocket and Server-Sent Events ● Built on Avatar.js
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- 35. Avatar ● Deployingan application on Glassfish 4 ○ asadmin deploy ~/projects/<app-folder-name> ● Running the application ○ http://localhost:8080/<app-folder-name>
- 36. Avatar/Avatar.js ● Keybenefits ○ Avatar Services use an Actor-like concurrency model ○ NPM modules support ○ Strong Java EE integration ○ Debugging
- 37. Avatar/Avatar.js ● Challenges ○ Weak community involvement ○ Low activity and no stable release ○ Glassfish / Weblogic only ○ Model Store API supports only Oracle NoSQL for schemaless database
- 38. Benchmark ● Somesimple and naive scenarios ○ Posting and querying from database ○ Returning a simple JSON response ○ String concatenation ○ Fibonacci calculation
- 39. Benchmark ● Node.js0.10.29 (2014-06-16) ● Avatar.js 0.10.28-SNAPSHOT (2014-07-20) ● Vert.X 2.1.1 (2014-06-18) ● Avatar 1.0-ea-SNAPSHOT (2014-07-26) ● JDK 8u5
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- 44. Credits ● Event-loop& Vert.X architecture ○ Slideshare presentation http://bit.ly/1qz6KUb ● Microservice architecture ○ http://martinfowler.com/articles/microservices.html ● Avatar.js architecture ○ Project Avatar.js website ● Avatar and Avatar EE architectures ○ Project Avatar website
- 45. Thank you! @leonardopanga @mgraciano ● Sources ○ github.com/mgraciano/javaone-2014 ○ github.com/panga/javaone2014-benchmarks