Integration using Apache Camel and Groovy

Claus IbsenRed Hat

●Integration usingApache Camel & Groovy

PUBLIC PRESENTATION | CLAUS IBSEN2

Your Speaker

● Principal Software Engineer at Red Hat

● Apache Camel● 6 years as committer

● Author of Camel in Action book

● Contact● EMail: [email protected]● Twitter: @davsclaus● Blog: http://davsclaus.com● Linkedin: http://www.linkedin.com/in/davsclaus

http://davsclaus.com/

http://www.linkedin.com/in/davsclaus


This awesome ...


These two awesome has ...


These three awesome has ...


These three awesome has something in common


Agenda

● What is Apache Camel?

● A little Example

● Riding Camel

● Creating new Camel Projects

● hawtio

● Q & A


Why the name Camel?


Why the name Camel?

Because Camel iseasy to remember and type ...


Why the name Camel?

… or the creator used to smoke cigarets!

http://camel.apache.org/why-the-name-camel.html


What is Apache Camel?

● Quote from the website



● Why do we need integration?● Critical for your business to integrate

● Why Integration Framework?● Framework do the heavy lifting● You can focus on business problem● Not "reinventing the wheel"



● What is Enterprise Integration Patterns?

It's a book



● Enterprise Integration Patterns

http://camel.apache.org/eip



● EIP - Content Based Router



from newOrder



from newOrder choice



from newOrder choice when isWidget to widget



from newOrder choice when isWidget to widget otherwise to gadget



from(newOrder) choice when(isWidget) to(widget) otherwise to(gadget)



from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);



from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);Ups S

orry ...

This is

a gr8conf

so le

ts get G

roovy :)



from newOrder choice when isWidget to widget otherwise to gadget



from newOrder choice when isWidget to widget otherwise to gadgetUnfortu

nately the C

amel

Groovy D

SL is not a

s

awesome …

yet



from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget)

We removed that last semi colon ;)



Endpoint newOrder = endpoint("activemq:queue:newOrder");




Endpoint newOrder = endpoint("activemq:queue:newOrder");Predicate isWidget = xpath("/order/product = 'widget'");




Endpoint newOrder = endpoint("activemq:queue:newOrder");Predicate isWidget = xpath("/order/product = 'widget'");Endpoint widget = endpoint("activemq:queue:widget");Endpoint gadget = endpoint("activemq:queue:gadget");




● Java Code

public void configure() throws Exception { Endpoint newOrder = endpoint("activemq:queue:newOrder"); Predicate isWidget = xpath("/order/product = 'widget'"); Endpoint widget = endpoint("activemq:queue:widget"); Endpoint gadget = endpoint("activemq:queue:gadget");

from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget) .end(); }



● Java Codeimport org.apache.camel.Endpoint;import org.apache.camel.Predicate;import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

public void configure() throws Exception { Endpoint newOrder = endpoint("activemq:queue:newOrder"); Predicate isWidget = xpath("/order/product = 'widget'"); Endpoint widget = endpoint("activemq:queue:widget"); Endpoint gadget = endpoint("activemq:queue:gadget");

from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget) .end(); }}



● Camel Java DSL

import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

public void configure() throws Exception { from("activemq:queue:newOrder") .choice() .when(xpath("/order/product = 'widget'")) .to("activemq:queue:widget") .otherwise() .to("activemq:queue:gadget") .end(); }}



● Camel XML DSL

<route> <from uri="activemq:queue:newOrder"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route>



● Endpoint as URIs

<route> <from uri="file:inbox/orders"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route>

use file instead



● Endpoint as URIs

<route> <from uri="file:inbox/orders?delete=true"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route>

parameters


Standard Java, XML, or Groovy

● Java DSL is just Java



● XML DSL is just XML

● … with XSD schema for validation/tooling



● Groovy DSL is just Groovy

GroovyClosure



● Camel's Architecture



150+ Components



● Summary● Integration Framework● Enterprise Integration Patterns (EIP)● Routing (using DSL)● Easy Configuration (endpoint as uri's)● Just Java, XML, or Groovy code● No Container Dependency● A lot of components


Agenda



● Riding Camel


● hawtio

● Q & A


A Little Example

● File Copier Example


A Little Example



A Little Groovy Example


A Little Groovy Example (all source)


A Little Groovy Example

● Run the example● groovy mycamel.groovy


Agenda



● Riding Camel


● hawtio

● Q & A


Riding Camel

● Downloading Apache Camel● zip/tarball (approx 8mb)

http://camel.apache.org


Riding Camel

● Using Command Shell● Requires: Apache Maven

● From Eclipse


Riding Camel

● Console Example

● cd examples/camel-example-console

● mvn compile exec:java


Riding Camel

● Twitter Example

● cd examples/camel-example-twitter-websocket

● mvn compile exec:java http://localhost:9090/index.html


Riding Camel

● More examples ...

... and further details at website.

http://camel.apache.org/examples


Agenda



● Riding Camel


● hawtio

● Q & A


Creating new Camel Projects

● Using Command Shell

● .. or from Eclipse



● Importing into Eclipse

Existing Maven Project



● Maven Archetypes

camel-archetype-activemq camel-archetype-java

camel-archetype-blueprint camel-archetype-scala

camel-archetype-component camel-archetype-spring

camel-archetype-dataformat camel-archetype-spring-dm

camel-archetype-groovy camel-archetype-web



● camel-archetype-groovy

mvn installmvn exec:java



● camel-archetype-spring

mvn installmvn camel:run

mvn io.hawt:hawtio-maven-plugin:1.4.2:spring


Agenda



● Riding Camel


● hawtio

● Q & A


hawtio

● What does it do? ...


hawtio

● Yet another awesome project created by this guy ...


hawtio

Tooling – Web Console - hawtio

http://hawt.io


hawtio

● What does it dofor Apache Camel?


hawtio

● Technology Stack● HTML5 single page app● TypeScript → JavaScript● Angular JS● Bootstrap CSS● HTTP/REST ↔ backend● Jolokia on backend for JMX over REST● Plugins expose services as JMX or REST

http://hawt.io/plugins/howPluginsWork.html


Apache Camel & hawtio


Agenda



● Riding Camel


● hawtio

● Q & A


What about a 4th awesome project?


Any Questions ?

● Contact● EMail: [email protected] / [email protected] ● Twitter: @davsclaus● Blog: http://davsclaus.com● Linkedin: http://www.linkedin.com/in/davsclaus

mailto:[email protected]

mailto:[email protected]

http://davsclaus.com/

http://www.linkedin.com/in/davsclaus

Integration using Apache Camel and Groovy

Technology

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