Camel and JBoss

Implementing Enterprise Integration
Patterns through Apache Camel

Andrea Leoncini, Red Hat
1

lunedì 18 febbraio 13

Your speaker today

 Andrea Leoncini
• andrea.leoncini@redhat.com
• 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

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


What are Enterprise Integration Patterns?



Book by Gregor & Bobby!



A selection of some of the patterns...



What is Apache Camel?

http://camel.apache.org/



What is Apache Camel?

Apache Camel is a Powerful Open
Source
Integration Framework
based on known
Enterprise Integration Patterns

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



Lets look at a pattern!



Message Filter



Message Filter : XML

<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 : Spring XML

<?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">

<route>
<filter>
</filter>
</route>
</camelContext>

</beans>



Expressions & Predicates

15 Expression
Languages BeanShell Python
EL Ruby
Groovy Simple
JavaScript SpEL
JSR 223 SQL
OGNL XPath
MVEL XQuery
PHP



URIs, Endpoints and Components (120+)

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

activemq cxf ﬂatpack jasypt
activemq-journal cxfrs freemarker javaspace
amqp dataset ftp/ftps/sftp jbi
atom db4o gae jcr
bean direct hdfs jdbc
bean validation ejb hibernate jetty
browse esper hl7 jms
cache event http jmx
cometd exec ibatis jpa
crypto ﬁle irc jt/400



120+ components...

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



Message Filter : Java

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



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");
}
}



Message Filter : Scala

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



Create CamelContext in Spring

<package>com.acme.quotes</package>
</camelContext>



Create CamelContext in Java

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



IDE support (XML)



Recap - core concepts of Camel

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



Beans



Bean as a Message Translator

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



Bean

public class Foo {

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



Binding Beans to Camel Endpoints

public class Foo {

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



Binding Method Arguments

public class Foo {

public Object onCheese(
@XPath("/foo/bar") String name,
@Header("JMSCorrelationID") String id) {
...
}
}
for more annotations see
http://camel.apache.org/bean-integration.html



Sending messages to endpoints

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

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



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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