Camel and JBoss

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Implementing Enterprise Integration Patterns through Apache Camel

Andrea Leoncini, Red Hat

lunedì 18 febbraio 13

Copyright © 2013 Red Hat, Inc. All rights reserved.

Your speaker today

Andrea Leoncini• [email protected]• twitter: @leopericoli

Senior Middleware Solution Architect at Red Hat• leaders in open source middleware & integration• we provide training, consulting, support, distributions & tools for open

source integration software

In the community• co-founder of JUG Roma• co-founder of JBUG Roma, JBUG Milano• andrea.leoncini @JBoss Community• pride founder of JBoss Consulting Team in Italy

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What are Enterprise Integration Patterns?

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Book by Gregor & Bobby!

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A selection of some of the patterns...

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What is Apache Camel?

http://camel.apache.org/

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http://activemq.apache.org/camel/

http://activemq.apache.org/camel/


What is Apache Camel?

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Apache Camel is a Powerful Open Source

Integration Frameworkbased on known

Enterprise Integration Patterns

http://camel.apache.org/enterprise-integration-patterns.html


http://activemq.apache.org/camel/enterprise-integration-patterns.html

http://activemq.apache.org/camel/enterprise-integration-patterns.html


Lets look at a pattern!

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Message Filter

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<camelContext xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="activemq:topic:Quotes"/> <filter> <xpath>/quote/product = ‘widget’</xpath> <to uri="mqseries:WidgetQuotes"/> </filter> </route> </camelContext>


Message Filter : XML

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http://activemq.apache.org/camel/schema/spring


<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">


</beans>


Message Filter : Spring XML

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http://www.springframework.org/schema/beans


http://www.w3.org/2001/XMLSchema-instance

http://www.w3.org/2001/XMLSchema-instance



http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

http://www.springframework.org/schema/beans/spring-beans-2.0.xsd



http://activemq.apache.org/camel/schema/spring/camel-spring.xsd

http://activemq.apache.org/camel/schema/spring/camel-spring.xsd






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Expressions & Predicates

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15 ExpressionLanguages BeanShell Python

EL RubyGroovy Simple

JavaScript SpELJSR 223 SQLOGNL XPathMVEL XQueryPHP



URIs, Endpoints and Components (120+)

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http://camel.apache.org/components.html

activemq cxf flatpack jasyptactivemq-journal cxfrs freemarker javaspace

amqp dataset ftp/ftps/sftp jbiatom db4o gae jcrbean direct hdfs jdbc

bean validation ejb hibernate jettybrowse esper hl7 jmscache event http jmx

cometd exec ibatis jpacrypto file irc jt/400


http://activemq.apache.org/camel/components.html

http://activemq.apache.org/camel/components.html


120+ components...

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language properties seda stream

ldap quartz servlet string-template

mail/imap/pop3 quickfix sip test

mina ref smooks timer

mock restlet smpp validation

msv rmi snmp velocity

nagios rnc spring-integration vm

netty rng spring-security xmpp

nmr rss spring-ws xquery

printer scalate sql xslt





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Message Filter : Java

from("activemq:topic:Quotes”). filter().xpath("/quote/product = ‘widget’"). to("mqseries:WidgetQuotes");

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Message Filter : Java Complete

package com.acme.quotes;

import org.apache.camel.builder.RouteBuilder;

public class MyRouteBuilder extends RouteBuilder { public void configure() {

// forward widget quotes to MQSeries from("activemq:topic:Quotes”). filter().xpath("/quote/product = ‘widget’"). to("mqseries:WidgetQuotes");

}}

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Message Filter : Scala

"direct:a" when(_.in == "<hello/>") { to("mock:a")}

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<camelContext xmlns="http://camel.apache.org/schema/spring"> <package>com.acme.quotes</package></camelContext>


Create CamelContext in Spring

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CamelContext context = new DefaultCamelContext();context.addRoutes(new MyRouteBuilder());context.start();


Create CamelContext in Java

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IDE support



IDE support (XML)

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Recap - core concepts of Camel

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Enterprise Integration Patterns Routing Domain Specific Language (DSL) Endpoints & URIs Predicates & Expressions Components (lots of ‘em!) Test Kit

and much more ...



Beans

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Bean as a Message Translator

from("activemq:Incoming”). beanRef("myBeanName”, “someMethod"). to("activemq:Outgoing");

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Bean

public class Foo {

public String someMethod(String name) { return “Hello “ + name; }}

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public class Foo {

@Consume(uri="activemq:cheese") public Object onCheese(String name) { ... }}


Binding Beans to Camel Endpoints

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public class Foo {

public Object onCheese( @XPath("/foo/bar") String name, @Header("JMSCorrelationID") String id) { ... }}


Binding Method Arguments

for more annotations seehttp://camel.apache.org/bean-integration.html

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http://activemq.apache.org/camel/bean-integration.html

http://activemq.apache.org/camel/bean-integration.html

public class Foo { @Produce(uri="activemq:foo.bar") ProducerTemplate producer;

public void doSomething() { if (whatever) { producer.sendBody("<hello>world!</hello>"); } }}


Sending messages to endpoints

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Sending messages to endpoints

public interface MyListener { String sayHello(String name);}

public class MyBean { @Produce(uri = "activemq:foo") protected MyListener producer;

public void doSomething() { // lets send a message String response = producer.sayHello("James"); }}

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Technology

Camel and JBoss