camel overview

1

Implemen(ng Enterprise Integra(on Pa3erns through Apache Camel

James Strachan, Red Hat

Friday, February 8, 2013

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

Your speaker today

James Strachan• [email protected]

• twi8er: @jstrachan

• blog: h8p://macstrac.blogspot.com/

Senior Consul(ng SoFware Engineer at Red Hat• leaders in open source middleware & integra?on

• we provide training, consul?ng, support, distribu?ons & tools for open source integra?on soCware

Open Source hacker• created the Groovy programming language

• created Apache Camel

• co-‐founder of– Apache Ac(veMQ, ServiceMix, Geronimo

– Scalate

• lets not men?on Jelly :)

2


http://macstrac.blogspot.com

http://macstrac.blogspot.com


What are Enterprise Integra?on Pa8erns?

3



Book by Gregor & Bobby!

4



A selec?on of some of the pa8erns...

5



What is Apache Camel?

http://camel.apache.org/

6


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

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


What is Apache Camel?

7

Apache Camel is a Powerful Open SourceIntegra(on Framework

based on knownEnterprise Integra(on Pa3erns

h3p://camel.apache.org/enterprise-‐integra(on-‐pa3erns.html


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

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


Lets look at a pa8ern!

8



Message Filter

9


<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

10


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

11


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






12





Expressions & Predicates

13

15 ExpressionLanguages BeanShell Python

EL RubyGroovy Simple

JavaScript SpELJSR 223 SQLOGNL XPathMVEL XQueryPHP



URIs, Endpoints and Components (120+)

14

h8p://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...

15

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





16





Message Filter : Java

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

17



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");

}}

18



Message Filter : Scala

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

19


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


Create CamelContext in Spring

20




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


Create CamelContext in Java

21



IDE support



IDE support (XML)

23



Recap -‐ core concepts of Camel

24

Enterprise Integra(on Pa3erns

Rou(ng

Domain Specific Language (DSL)

Endpoints & URIs

Predicates & Expressions

Components (lots of ‘em!)

Test Kit

and much more ...



Beans

25



Bean as a Message Translator

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

26



Bean

public class Foo {

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

27


public class Foo {

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


Binding Beans to Camel Endpoints

28


public class Foo {

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


Binding Method Arguments

for more annota(ons seeh3p://camel.apache.org/bean-‐integra(on.html

29


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

30



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"); }}

31



Fastest way to learn....

Manning top-‐15 year to date (2010)

#10 #12Friday, February 8, 2013


Fuse IDE: the fastest way to get riding!

free eclipse based tool for Apache Camel & Ac(veMQ etc• create projects, edit routes, run stuff, visualise, trace & diagnose

h3p://fusesource.com/

33


http://fusesource.com



Summary: Camel rocks

Ride that Camel• h8p://camel.apache.org/

Download Fuse IDE• h8p://fusesource.com

Buy the book! Don’t get the hump!

34


http://camel.apache.org

http://camel.apache.org




Any Ques(ons?

35

twi3er: @jstrachan #fusenews

h3p://fusesource.com




camel overview

Documents

red hat leaders

widget copyright

red hatfriday

apache camel james strachan

message filter9friday

open source integra

open source middleware

spring xml11friday