Creating polyglot and scalable applications on the jvm using Vert.x
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In this presentation I show the basic vert.x options for creating polyglot applications that scale on the JVM. Later on the live presentation will also be published. It will be in Dutch though.
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Creating polyglot and scalable applications on the jvm using Vert.x
- 1. Creating Polyglot and Scalable Applications on the JVM with Vert.x Jettro Coenradie @gridshore dinsdag 30 oktober 12 The butterfly represents the lightweight scalable architecture
- 2. http://maps.google.com dinsdag 30 oktober 12 Does this territory look familiar?
- 3. http://maps.google.com dinsdag 30 oktober 12 Tripoint of countries: The netherlands, Germany and Belgium People here speak multiple languages and are therefore Polyglot
- 4. Polyglot applications http://maps.google.com dinsdag 30 oktober 12 - Polyglot applications is not about writing them in Dutch, German and French - Discuss combining multiple jvm languages in one application
- 5. JDBC, Reflection JIT Compiler, Collections framework Hotspot JVM, JNDI Reg Exp, NIO, XML parsing Generics, Varargs, enums Scripting Language Support Dynamic languages on JVM 1 1.1 1.2 1.3 1.4 5 6 7 1996 1997 1998 2000 2002 2004 2006 2011 dinsdag 30 oktober 12 The history of the JVM and the introduction of Dynamic languages on the JVM and the importance for a polyglot application on the JVM.
- 6. Polyglot applications on the JVM dinsdag 30 oktober 12 Now the JVM supports creating Polyglot applications.
- 7. C10K Problem http://www.tumblr.com/tagged/rockconcert?before=1346635427 dinsdag 30 oktober 12 C10k problem The crowd becomes to big for your platform
- 8. http://en.wikipedia.org/wiki/C10k_problem dinsdag 30 oktober 12 Wikipedia page about the C10K problem showing the main characteristics of available solutions: event-driven, non-blocking and asynchronous
- 9. Scalable applications on the JVM dinsdag 30 oktober 12 Some of the mentioned solutions run on the JVM and the JVM is the right tools for the job when you want to create non-blocking, event-driven, asynchronous applications.
- 10. Vert.x ✦Netty ✦JRuby ✦Groovy ✦Rhino ✦Jython ✦Hazelcast @timfox dinsdag 30 oktober 12 Introduction of vertx, the creator and the main technologies used.
- 11. Polyglot application platform JavaScript dinsdag 30 oktober 12 The available languages for vert.x and the languages for which support is being created.
- 12. Scalable: Blocking to non-blocking dinsdag 30 oktober 12 Blocking has the risk that the CPU is doing nothing while a thread is waiting for input Non-blocking: can use the CPU more effectively if there is something to do, it does not fall asleep
- 13. Easily Concurrent dinsdag 30 oktober 12 - We can use the multiple cores of a machine within one JVM - Easy concurrency due to thread bound modules and verticles => No Locking - Synchronous calling of a request handler. Therefore no concurrency issues.
- 14. Vert.x Components Event Loop 1 Background Pool Verticle Verticle Worker Worker Core Services Event Bus Module Module Module Event Loop 2 dinsdag 30 oktober 12 Go through all the different components of Vert.x
- 15. Vert.x Core Event Loop 1 Background Pool • Must be implemented by all languages Verticle Verticle Worker Worker Core • Core services must be called direct Services • Example Services Event Bus • TCP/SSL, HTTP/HTTPS, WebSockets, Module Module Module Logging, SockJS and more Event Loop 2 dinsdag 30 oktober 12 Core services must be called directly, no need for sending messages
- 16. Verticle Background Pool • Unit of deployment in Vert.x Event Loop 1 Verticle Verticle Worker Worker Core • Can contain other scripts Services • Can contain libraries Event Bus • Can start other verticles Module Module Module Event Loop 2 dinsdag 30 oktober 12 - Demo basic verticle
- 17. Module Background Pool • Modules communicate using messages Event Loop 1 Verticle Verticle Worker Worker Core • A public module repository Services • https://github.com/vert-x/vertx-mods/ Event Bus tree/gh-pages/mods Module Module Module Event Loop 2 dinsdag 30 oktober 12
- 18. Worker Verticle Background Pool • For tasks that require blocking Event Loop 1 Verticle Verticle Worker Worker Core • For tasks that take a lot of computation Services • Uses thread of the background pool Event Bus • They are never executed by more than one Module Module Module thread Event Loop 2 dinsdag 30 oktober 12
- 19. Verticle or Module Background Pool • Verticle is easy to use Event Loop 1 Verticle Verticle Worker Worker Core • Verticle needs to be configured with its Services classpath when running Event Bus • A module is a package of vert.x stuff complete with dependencies. Module Module Module Event Loop 2 dinsdag 30 oktober 12
- 20. Communicating between modules • Send messages over the Event bus • Vert.x will automatically convert messages between modules Java JsonObject Groovy Map Ruby Hash JavaScript Object Python Hash dinsdag 30 oktober 12 Messages can contain contain raw types, but JSON is recommended to be used for information sending using messages.
- 21. Threads Event loop • Amount equals number of cores • Verticles/modules are assigned to an event loop Background Pool • A thread pool for worker verticles • Actions can block or take longer CPU time dinsdag 30 oktober 12
- 22. Demo: Office events Event Loop 1 Background Pool Backup App Core Services Event Bus Mongo Invitations Website Notifications Persistor Event Loop 2 Event Loop 1 https://github.com/jettro/vertx-samples/tree/master/office-events dinsdag 30 oktober 12 The office events demo is available on github. It is used to show modules, verticles and worker verticles in different languages.
- 23. Module layout • Module naming: prefix.<name>-v<version> • mod.json • scripts or classes • lib/ - libraries required by the module dinsdag 30 oktober 12 mod.json is the configuration for the module containing the main item, worker or not and some other options.
- 24. Configuration • Pass configuration when deploying a verticle or module • Use a json object • json is used according the language as discussed before dinsdag 30 oktober 12
- 25. Events • Publish/Subscribe • Peer-to-Peer • Replying to messages • Distributed event-bus dinsdag 30 oktober 12 More info about event usage in Vert.x
- 26. Logging • Default uses java utils logging • Use other logging framework: log4j for example • <home>/bin/vertx • DEFAULT_JVM_OPTS="-Dorg.vertx.logger-delegate-factory-class- name=org.vertx.java.core.logging.impl.Log4jLogDelegateFactory" • Add the library to the vertx lib folder • Create a log4j.properties file dinsdag 30 oktober 12
- 27. There is more • Shared data • Embedded mode • Clustered mode dinsdag 30 oktober 12
- 28. More info Vert.x Tim Fox @timfox Jettro http://vertx.io Downloads and Coenradie documentation http://groups.google.com/group/vertx @jettroCoenradie https://github.com/jettro/vertx- samples/ office-events @gridshore http://www.linkedin.com/in/jettro http://www.gridshore.nl http://www.trifork.nl https://github.com/jettro/ dinsdag 30 oktober 12
- 29. Questions ?? Rock ?? Concert by Rod Stewart with 3.500.000 visitors dinsdag 30 oktober 12 Now we can scale our rock concert to around 3.5 million users.