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Event loop

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C
codepitbull

The document discusses concepts related to event loops and concurrency in programming. It includes code snippets in Java showing the use of NIO selectors and channels for non-blocking I/O. Diagrams are shown illustrating reactor patterns and Vert.x modules deployed across multiple CPUs. The summary provides an overview of the main topics and techniques discussed in the technical document.

Technologie
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Event Loop + Vert.x
Chief Developer @ Senacor Technologies AG! http://www.senacor.com! jochen.mader@senacor.com! Twitter: @codepitbull Jochen Mader
CPU ABC 42 1 2 3 4 5 6 7 8 9 0
CPU
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volatile CyclicBarrier AtomicBoolean synchronized ReentrantLock AtomicInteger AtomicCafe Thread ThreadPoolExecutor Runnable Callable
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C10K ZZZZZZZZZz ZZZZZZZZZz ZZZZZZZZZz
Single Thread 1 Thread w/ lock 2 Threads w/ lock 1 Thread w/ CAS 2 Threads w/ CAS Volatile 0 12500 25000 37500 50000 Contention https://github.com/codepitbull/lockperformance
I/O Acces type cycles L1- Cache 3 L2-Cache 14 RAM 250 Disk 41000000 Network 240000000 http://blog.mixu.net/2011/02/01/understanding-the-node-js-event-loop/
contentionI/O
Channel A Channel B Channel C Channel D Selector Event Handler 1 Event Handler 2 Event Handler 3 Event Handler 4 Event Handler 5 REACTOR DO NOT BLOCK! JAVA NIO
Selector selector = Selector.open();
 
 channel.configureBlocking(false);
 
 SelectionKey key = channel.register(selector, SelectionKey.OP_READ);
 
 while(true) {
 int readyChannels = selector.select();
 
 if(readyChannels == 0) continue;
 
 Set<SelectionKey> selectedKeys = selector.selectedKeys();
 
 Iterator<SelectionKey> keyIterator = selectedKeys.iterator();
 
 while(keyIterator.hasNext()) {
 
 SelectionKey key = keyIterator.next();
 
 if(key.isAcceptable()) {
 // a connection was accepted by a ServerSocketChannel.
 } else if (key.isConnectable()) {
 // a connection was established with a remote server.
 } else if (key.isReadable()) {
 // a channel is ready for reading
 } else if (key.isWritable()) {
 // a channel is ready for writing
 }
 
 keyIterator.remove();
 }
 }
I NEEEEDS ! NICE API!!!!
Channel A Channel B Channel C Channel D Selector Event Handler 1 Event Handler 2 Event Handler 3 Event Handler 4 Event Handler 5 12.10.2012
Noch ! hübscher?
Quasar
生 ॐ СВОБОДА
Micro Services (Martin Fowler) http://martinfowler.com/articles/microservices.html
class MustacheRendererVerticle extends Verticle {
 
 DefaultMustacheFactory mf = new DefaultMustacheFactory( "de/codepitbull/javaland/mustache");
 
 @Override
 def start() {
 vertx.eventBus.registerHandler("template.render", { message ->
 Mustache mustache = mf.compile(message.body());
 StringWriter sw = new StringWriter();
 mustache.execute(sw, new Example()).flush();
 message.reply(sw.getBuffer().toString());
 });
 }
 
 }
Verticle Module 1 0..n 0..n 1 System vert.x module1 verticle 1 verticle 2 module2 verticle 3 verticle 4
import org.vertx.groovy.platform.Verticle
 
 class DemoVerticle extends Verticle {
 @Override
 Object start() {
 container.deployModule("io.vertx~mod-web-server~2.0.0-final", container.config)
 }
 } io.vertx~mod-web-server~2.0.0-final
official community 生 ॐ СВОБОДА
Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle
Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Multicast
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mod 2mod 1 CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU vertx -ha mod ? mod ? mod ? mod ? mod ? mod ? mod ? mod ?
mod 2mod 1 CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU vertx -ha mod ? mod ? mod ? mod ? mod ? mod ? mod ? mod ? CPU CPU CPU CPU CPU CPU CPU CPU
mod 2mod 1 CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU vertx -ha mod ? mod ? mod ? mod ? mod ? mod ? mod ? mod ? CPU CPU CPU CPU CPU CPU CPU CPU mod 2mod 1
DEMO
Leseliste/Quellen http://www.cs.wustl.edu/~schmidt/PDF/reactor-siemens.pdf http://tutorials.jenkov.com/java-nio/selectors.html https://www.ibm.com/developerworks/java/library/j-jtp02225/ http://blog.tsunanet.net/2010/11/how-long-does-it-take-to-make-context.html http://blog.mixu.net/2011/02/01/understanding-the-node-js-event-loop/ http://lmax-exchange.github.io/disruptor/ https://github.com/codepitbull/lockperformance

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