Getting Started with Apache Camel - Malmo JUG - March 2013

Getting Started with Apache Camel

Claus Ibsen (@davsclaus)
Principal Software Engineer, Red Hat
Javaforum Malmo, march 2013

1 PUBLIC PRESENTATION | CLAUS IBSEN

Agenda

● What is Apache Camel?
● A little Example
● Riding Camel
● What's in the Camel box?
● Deploying Camel
● Creating new Camel Projects
● Q and A


Your Speaker

● Principal Software Engineer at Red Hat
● Apache Camel
● 5 years working with Camel
● Author of Camel in Action book
● Contact
● EMail: cibsen@redhat.com
● Twitter: @davsclaus
● Blog: http://davsclaus.com


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);



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

from(newOrder)
.choice()



Predicate isWidget = xpath("/order/product = 'widget'");

from(newOrder)
.choice()



Endpoint widget = endpoint("activemq:queue:widget");
Endpoint gadget = endpoint("activemq:queue:gadget");

from(newOrder)
.choice()



● Java Code

public void configure() throws Exception {

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



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

public class MyRoute extends RouteBuilder {


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


● Camel Java DSL

import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

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>


use file instead
● Endpoint as URIs
<route>
<from uri="file:inbox/orders"/>
<choice>
<when>
</when>
<otherwise>
</otherwise>
</choice>
</route>


parameters
● Endpoint as URIs
<route>
<from uri="file:inbox/orders?delete=true"/>
<choice>
<when>
</when>
<otherwise>
</otherwise>
</choice>
</route>



● Camel's Architecture



120+ Components



● Summary
● Integration Framework
● Enterprise Integration Patterns (EIP)
● Routing (using DSL)
● Easy Configuration (endpoint as uri's)
● Payload Agnostic
● No Container Dependency
● A lot of components


Agenda

● Riding Camel
● Deploying Camel
● Extending Camel
● Q and A


A Little Example

● File Copier Example


A Little Example



Agenda

● Riding Camel
● Deploying Camel
● Q and A


Riding Camel

● Downloading Apache Camel
● zip/tarball (approx 14mb)

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
● What's in the box?
● Deploying Camel
● Q and A


What's in the box?


What's in the box?

● Enterprise Integration Patterns

http://camel.apache.org/eip


What's in the box?

● Splitter EIP



120+ Components



19 Data Formats



15 Expression Languages



5+ DSL in multiple languages
● Java DSL
● XML DSL (Spring and OSGi Blueprint)
● Groovy DSL
● Scala DSL
● Kotlin DSL (work in progress)



Test Kit
● camel-test camel-test-spring
● camel-test-blueprint camel-testng



Management
● JMX
● REST



Tooling – Web console - HawtIO

http://hawt.io


Tooling – Eclipse Plugin – Fuse IDE

http://github.com/fusesource/fuseide


Error Handling



try .. catch style



Dead Letter Channel (EIP style)


The Rest
● Interceptors
● Security
● Route Policy
● Type Converters
● Transaction
● Compensation as rollback
● Asynchronous non-blocking routing engine
● Thread management
● Maven Tooling
● ... and much more

Agenda

● Riding Camel
● Deploying Camel
● Extending Camel
● Q and A


Deploying Camel

● Deployment Strategy
● No Container Dependency
● Lightweight & Embeddable
● Deployment Options
● Standalone
● WAR
● Spring
● JEE
● OSGi
● Cloud


Camel as a Client

● Java Client Application (no routes)
● Example
● Upload a file to a FTP server


Agenda

● Riding Camel
● Deploying Camel
● Q and A


Creating new Camel Projects

● Using Command Shell

● From Eclipse



● Maven Archetypes



● camel-archetype-blueprint



● Importing into Eclipse

Existing Maven Project



● Testing Camel Projects

● ... from inside Eclipse


Agenda

● Riding Camel
● Deploying Camel
● Q and A


Where do I get more information?
● Best Article covering what Apache Camel is
● http://java.dzone.com/articles/open-source-integration-
apache

Link to article from “Getting Started”


● Try Camel Examples
● http://camel.apache.org/examples.html

● Read other blogs and articles
● http://camel.apache.org/articles.html

● Use the “search box” on the Camel front page


● Use the mailing list / forum
● http://camel.apache.org/mailing-lists.html

● Use stackoverflow
● http://stackoverflow.com/questions/tagged/apache-camel


● Buy the Camel in Action book

Use code ...
camel40
… for 40% discount

http://manning.com/ibsen/


Any Questions ?

● Contact
● EMail: cibsen@redhat.com
● Twitter: @davsclaus
● Blog: http://davsclaus.com


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