Enterprise Integration Patterns and DSL with Apache Camel

Copyright © 2010 Progress So3ware Corpora6on and/or its subsidiaries or affiliates. All rights reserved. A Progress So3ware Company

A Progress So3ware Company

Enterprise Integra6on PaDerns and DSLwith Apache Camel

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by Claus Ibsen

Principal So3ware Engineer, FuseSource

Copyright © 2011 Progress So3ware Corpora6on and/or its subsidiaries or affiliates. All rights reserved. A Progress So3ware Company2

Agenda

Who is Claus Ibsen? What is Apache Camel? Camel Architecture Whats included in the box? Running Camel Live Demos Apache ServiceMix Apache Camel Roadmap Q and A


Who is Claus Ibsen?

Principal So3ware Engineer at FuseSource• Full 6me Apache Camel hacker

Apache Camel commiDer• Camel Top Contributor• 4 years working with Camel

Author of Camel in Ac6on book Contact

• TwiDer: @davsclaus• Blog: hDp://davsclaus.blogspot.com• Email: [email protected]

hDp://www.manning.com/ibsen

http://davsclaus.blogspot.com


mailto:[email protected]


http://www.manning.com/ibsen/

http://www.manning.com/ibsen/


FuseSource -‐ hDp://fusesource.com

My Employer

http://fusesource.com

http://fusesource.com


Agenda

Who is Claus Ibsen? What is Apache Camel? Camel Architecture Whats included in the box? Running Camel Live Demos Apache ServiceMix Apache Camel Roadmap Q and A


What is Apache Camel

Quote from the web site • hDp://camel.apache.org

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Apache Camel is apowerful Open SourceIntegra6on Framework

based on knownEnterprise Integra6on PaDerns

http://camel.apache.org

http://camel.apache.org



Why do we need integra6on?• Your apps are build using different tech stacks

• Cri6cal for your business to integrate

Why Integra6on Framework?• Framework do the heavy li3ing

• Focus on business problem

• Not "reinven6ng the wheel"

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What is Enterprise Integra6on PaDerns?

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System A System B



What is Enterprise Integra6on PaDerns?

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Its a book



Camel and EIP

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ApacheAc6veMQ

WebSphereMQ



Camel and EIP

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Camel and EIP

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fromA

send toB

filtermessage



Camel and EIP

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from(A) to(B)filter(predicate)



Camel and EIP

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from(A) .to(B).filter(isWidget)



Camel and EIP

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



Camel and EIP

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isWidget = xpath("/quote/product = ‘widget’");




Camel and EIP

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Endpoint A = endpoint("ac6vemq:queue:quote");Endpoint B = endpoint("mq:quote");Predicate isWidget = xpath("/quote/product = ‘widget’");




Filter Route

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public void configure() throws Exception { Endpoint A = endpoint("activemq:queue:quote"); Endpoint B = endpoint("mq:quote"); Predicate isWidget = xpath("/quote/product = ‘widget’");

from(A).filter(isWidget).to(B);}



Filter Route -‐ Java DSL

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import org.apache.camel.builder.RouteBuilder;

public class FilterRoute extends RouteBuilder {

public void configure() throws Exception { Endpoint A = endpoint("activemq:queue:quote"); Endpoint B = endpoint("mq:quote"); Predicate isWidget = xpath("/quote/product = ‘widget’");

from(A).filter(isWidget).to(B); }}



Filter Route -‐ Java DSL

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import org.apache.camel.builder.RouteBuilder;

public class FilterRoute extends RouteBuilder {

public void configure() throws Exception { from("activemq:queue:quote") .filter().xpath("/quote/product =‘widget’") .to("mq:quote"); }}



Lets look at the most famous paDern

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Content Based Router

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Content Based Router -‐ XML DSL

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<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>



Content Based Router -‐ Java DSL

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



Endpoints as URIs

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from("file:inbox/orders") .choice() .when().xpath("/order/product = 'widget'") .to("activemq:Orders.Widget") .otherwise() .to("activemq:Orders.Gadget");

use file instead



Endpoints as URIs

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from("file:inbox/orders?delete=true") .choice() .when().xpath("/order/product = 'widget'") .to("activemq:Orders.Widget") .otherwise() .to("activemq:Orders.Gadget");

parameters



Summary• Integra6on framework• Enterprise Integra6on PaDerns (EIP) • Rou6ng (using DSL)• Easy configura6on (endpoints as URIs)• No heavy specifica6on• No container dependency• Payload agnos6c• A lot of components

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Agenda

Who is Claus Ibsen? What is Apache Camel? Camel Architecture Enterprise Integra6on PaDerns Running Camel Live Demos Apache ServiceMix Apache Camel Roadmap Q and A


Camel Architecture

Message PaDern

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Camel Architecture

Message

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Camel Architecture

Camel Exchange

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Camel Architecture

Camel Architecture

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Camel Architecture

Camel DSL -‐ Highest Level

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from("file:inbox/orders?delete=true") .choice() .when().xpath("/order/product = 'widget'") .to("activemq:Orders.Widget") .otherwise() .to("activemq:Orders.Gadget");

Camel DSL -‐ Lowest Level• Rou6ng Engine

• Processor API


Camel Architecture

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Iterator<Processor> it = ...while (it.hasNext()) { Processor processor = it.next(); processor.process(exchange);}

process(Exchange exchange) throws Exception;


Agenda

Who is Claus Ibsen? What is Apache Camel? Camel Architecture Enterprise Integra9on Pa;erns Running Camel Live Demos Apache ServiceMix Apache Camel Roadmap Q and A


Enterprise Integra6on PaDerns

50 Enterprise Integra6on PaDerns

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http://camel.apache.org/eip





Pipes and Filters EIP

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from("file:inbox") .pipeline() .to("bean:decrypt") .to("bean:authenticate") .to("bean:deDup");



Pipes and Filters EIP

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from("file:inbox") .to("bean:decrypt") .to("bean:authenticate") .to("bean:deDup");

pipeline() is default mode in Camel and can usually be omi5ed



SpliDer EIP

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from("file:inbox") .split(body().tokenize("\n") .marshal(customToXml) .to("activemq:line");

File Splitter Custom-> XML ActiveMQ



Recipient List EIP

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ActiveMQREST Service

stock.APPL

stock.ORCL

stock.XXXX



Recipient List EIP

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ActiveMQREST Service

curl -‐X POST -‐d "120" "hDp://localhost:9080/stock/ORCL"

stock.APPL

stock.ORCL

stock.XXXX

http://0.0.0.0:9080/stock/APPL

http://0.0.0.0:9080/stock/APPL



Bean as Message Translator

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Bean as Message Translator

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public class Foo {

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

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



Bean Parameter Binding w/ Annota6ons

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public class Foo {

public String someMethod(String name, @Header(”JMSCorrelationID”) String cid) { ... }}

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

Annota6ons



Bean Parameter Binding w/ Method Name (new in Camel 2.9)

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public class Foo {

public String someMethod(String name, String cid) { ... }}

from("activemq:Incoming"). beanRef("myBeanName", "someMethod(${body}, ${header.JMSCorrelationID})"). to("activemq:Outgoing");


Agenda



Running Camel

Deployment Strategy• No container dependency• Lightweight• Embedable

Deployment Op6ons•Standalone•Spring•WAR•JEE•OSGi•Cloud

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Known ContainersFuse ESBApache ServiceMixApache Ac6veMQApache TomcatJeDyJBossIBM WebSphereOracle WebLogicGlassfishGoogle App EngineAmazon EC2... others


Running Camel

Java Applica6on

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


Running Camel

Spring Applica6on

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<beans xmlns="http://www.springframework.org/schema/beans">

<camelContext xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="file:/orders"/> ... </route> </camelContext>

</beans>


Running Camel

Java Client Applica6on

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

ProducerTemplate template = context.newProducerTemplate();

Object data = ...String filename = "mydata.csv";String uri = "ftp:myftpserver?username=me&password=secret";

template.sendBodyAndHeader(uri, data, "CamelFileName", filename);


Agenda



Live Demo 1

Groovy Script

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groovy mycamel.groovycurl hDp://localhost:8080

HTTP Service Transform

http://localhost:8080

http://localhost:8080


Live Demo 1

Groovy Script (mycamel.groovy)

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Live Demo 1

Groovy Script (mycamel.groovy -‐ cont.)

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Live Demo 2

Create new Project using Maven

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mvn archetype:generate(camel-‐archetype-‐spring)

mvn eclipse:eclipsemvn camel:run

File Content Based Router

UK messages

Other messages


Live Demo 2

Create new Project using Maven

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Agenda



Apache ServiceMix

Architecture


Apache ServiceMix

Modular


Apache ServiceMix

ServiceMix and Camel Demo

SSH access to shell

ssh smx@localhost -‐p 8101


Agenda



Apache Camel Roadmap

Apache Camel 2.9.0 -‐ Highlights• Reduced Spring JAR dependency• Reworked Simple Expression Language• Splisng big XML files in streaming mode• Improved Bean Parameter Binding• Improved JMX• Improved JMS request/reply• Addi6onal Camel shell commands• JClouds Component

hDp://camel.apache.org/camel-‐290-‐release.html

hDp://davsclaus.blogspot.com

http://camel.apache.org/camel-290-release.html

http://camel.apache.org/camel-290-release.html

http://davsclaus.blogspot.com/

http://davsclaus.blogspot.com/



Apache Camel 2.10 -‐ Roadmap• Blueprint not 6ed to Apache Aries• Transac6on API not 6ed to Spring TX API• Make it easier to use Bindy• Persistent Dead LeDer Channel• CDI support• camel-‐mina2 component



Apache Camel 3.0 -‐ Roadmap• Split camel-‐core into mul6ple JARs• Support async transac6ons• Internal rou6ng engine cleanup• Dynamic add/remove interceptors to running routes• Unify JMX/REST API for management

hDp://camel.apache.org/camel-‐30-‐roadmap.html

http://camel.apache.org/camel-30-roadmap.html

http://camel.apache.org/camel-30-roadmap.html


Agenda



Q and A

? Contact

• TwiDer: @davsclaus• Blog: hDp://davsclaus.blogspot.com• Email: [email protected]





Technology

Enterprise Integration Patterns and DSL with Apache Camel