Introduction to Apache Camel

A Progress Software Company

Introduction toApache Camel

Bosanac DejanJanuary 2011

© 2010 FuseSource, a Progress Software Company. All rights reserved. A Progress Software Company

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About me

Bosanac Dejan Senior Software Engineer at FUSESource - http://

fusesource.com Apache ActiveMQ committer and PMC member Co-author of ActiveMQ in Action


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What is Apache Camel?

Apache Camel is a powerful Open Source Integration

Framework based on known Enterprise Integration Patterns


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Why Apache Camel?

Integration can be messy - variety of protocols and data formats

Framework hides all complexity so you can focus on your business logic


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Route example

Content Based Router


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Content based Router - XML

<camelContext> <route> <from uri="activemq:NewOrders"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:Orders.Widgets"/> </when> <otherwise> <to uri="activemq:Orders.Gadgets"/> </otherwise> </choice> </route></camelContext>


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Content Based Router - Java DSL

from("activemq:NewOrders") .choice() .when().xpath(“/order/product = 'widget'”) .to(“activemq:Orders.Widget”) .otherwise() .to(“activemq:Orders.Gadget”);


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50 Enterprise Integration Patterns

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




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80 Components

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

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

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



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80 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

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




19 Data Formats

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bindy protobufcastor serialization

csv soapcrypto syslogdozer tidy markup

flatpack xml beansgzip xml securityhl7 xstreamjaxb zipjson

http://camel.apache.org/data-format.html

from("activemq:QueueWithJavaObjects”) .marshal().jaxb() .to("mq:QueueWithXmlMessages");




14 Expression Languaes

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BeanShell PHP

EL Python

Groovy Ruby

JavaScript Simple

JSR 223 SQL

OGNL XPath

MVEL XQuery

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




DSL in 3 programming Languages

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XML<route> <from ref="A"/> <filter> <xpath>/quote/product = ‘widget’</xpath> <to ref="B"/> </filter></route>

Javafrom(A).filter(isWidget).to(B);

Scalafrom(A) filter(isWidget) --> B


Running Camel

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Deployment Strategy• No container dependency• Lightweight• Embeddable

Deployment Options• Standalone• WAR• Spring• J2EE• JBI• OSGi• Cloud

Known ContainersApache ServiceMix

Apache ActiveMQ

Apache Tomcat

Jetty

JBoss

IBM WebSphere

Oracle WebLogic

Oracle OC4j

Glassfish

Google App Engine

... others


Running Camel

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

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

Spring Application

Java Application


Managing Camel

JMX API REST API

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Fuse HQ SOA management and monitoring system based on Hyperic HQ Enterprise


Developer Web Console

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FuseSource Rider

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Rider Auto Parts Example by Jonathan Anstey

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http://architects.dzone.com/articles/apache-camel-integration





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Rider Example - Spring Configuration

<broker xmlns="http://activemq.apache.org/schema/core" persistent="false"> <transportConnectors> <transportConnectoruri="tcp://localhost:61616" /> </transportConnectors></broker>

<bean id="jms" class="org.apache.activemq.camel.component.ActiveMQComponent"> <property name="brokerURL" value="tcp://localhost:61616"/></bean>

<bean id="helper" class="org.fusesource.camel.OrderHelper"/>

<camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <package>org.fusesource.camel</package></camelContext>

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http://activemq.apache.org/schema/core

http://activemq.apache.org/schema/core

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

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


Rider Example - Route 1

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public class Route1 extends RouteBuilder {

public void configure() throws Exception { from("ftp:[email protected]?password=secret") .to("activemq:queue:incoming"); }}

mailto:[email protected]

mailto:[email protected]



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public void configure() throws Exception { from("jetty:http://localhost:8080/orders") .inOnly("activemq:queue:incoming") .transform().constant("OK"); }}



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public void configure() throws Exception { JaxbDataFormat jaxb = new JaxbDataFormat("com.rider"); BindyDataFormat bindy = new BindyDataFormat("com.rider");

from("activemq:queue:incoming") .convertBodyTo(String.class) .choice() .when().method("helper”, "isXml") .unmarshal(jaxb) .to("activemq:queue:order") .when().method("helper”, "isCsv") .unmarshal(bindy) .to("activemq:queue:order") }}


Rider Example - Data Samples

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XML Data

<?xml version="1.0" encoding="UTF-8"?><order name="motor" amount="1"/>

CSV Data

"name", "amount""brake pad", "2"


Rider Example - Order helper

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public class OrderHelper { public boolean isCsv(String body) { return !body.contains("<?xml"); } public boolean isXml(String body) { return body.contains("<?xml"); }}


Rider Example - Order Bean

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@XmlAccessorType(XmlAccessType.FIELD)public class Order implements Serializable { @XmlAttribute private String name; @XmlAttribute private int amount; public Order() { } public Order(String name, int amount) { this.name = name; this.amount = amount; } @Override public String toString() { return "Order[" + name + " , " + amount + "]"; }}


What else is there?

Error handling EIP annotations Test Kit Transactions Interceptors Security ...

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More Information

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Where do I get more information? Camel website: http://camel.apache.org Camel article: http://architects.dzone.com/articles/apache-camel-

integration Camel in Action book: http://manning.com/ibsen

http://camel.apache.org

http://camel.apache.org





http://manning.com/ibsen

http://manning.com/ibsen


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Blog: http://www.nighttale.net/

Twitter: http://twitter.com/dejanbhttp://twitter.com/fusenews

http://www.nighttale.net/


http://twitter.com/dejanb



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Questions?Blog: http://www.nighttale.net/

Twitter: http://twitter.com/dejanbhttp://twitter.com/fusenews





Technology

Introduction to Apache Camel