Solving Enterprise Integration
With
Apache Camel
Christian Posta
Principal Consultant and Architect
11/09/13
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Agenda
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What is Integration?
What is Apache Camel
Why Apache Camel?
Example
Questions?

Your speaker
Christian Posta
Blog: http://christianposta.com/blog
Twitter: @christianposta
Email: christian@redhat.com
ceposta@apache.org
• Principal Consultant and Architect at Red Hat (FuseSource)
• Based in Phoenix, AZ
• Committer on Apache Camel, ActiveMQ, Apollo
• PMC on ActiveMQ
• Author: Essential Camel Components DZone Refcard
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What is Integration?
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Integration?
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Integration…
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Just use one computer.
No integration needed.
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Why is integration hard?
• Off the shelf? Home Grown? Acquisition?
• Platforms
• Protocols / Data Formats
• Data Formats
• Timing
• Organizational mismatch
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Commercial Solutions?
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Enterprise Service Bus?
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Enterprise Service Bus…
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Extract the heart of ESB
• Protocol mediation
• Routing
• Transformation
• EIPs
• Start small, build up
• Open Source
• Community driven
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Patterns FTW!
• Common language!!!!!
• Specific context
• Forces at work
• Concrete solution
• Guidance
• Other patterns…
• 65 patterns
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What is Apache Camel?
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Proud parents of Camel
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Apache Camel
Apache Camel is an open-source,
light-weight, integration library.
Use Camel to integrate disparate systems
that speak different protocols and data formats
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Why the name Camel?
• Can carry more weight that other
beasts?
• James fancied the cigarettes?
• A horse designed by committee?
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Concise
Application
Messaging
Exchange
Language

What is Apache Camel?
• Light-weight integration library
• Enterprise Integration Patterns
• Components
• Domain Specific Language
• Routing and Mediation (like an ESB?)
• Runs in any container (or stand alone)
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Not an ESB…per-se…
• An integration library
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Routing (content-based, dynamic, rules-engine…)
Mediation (xformations, protocols, wire transports…)
DSL
• Can build an ESB (real ESB.. Not just box in the
middle)
• Many options based on Camel!
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Fuse ESB / JBoss Fuse
Apache ServiceMix (Karaf + Camel)
Talend, wso2, others…
Not tied to vendor lock-in and commercial licenses!

Quick Example
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Quick Example
File System
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Message Oriented Middleware

Quick Example
From A
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Filter
message
Send to B

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

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

Quick Example
isWidget = xpath(“/quote/product = ‘widget’”);
from(A) .filter(isWidget). to(B)
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Using Camel
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Very popular
• Used at top companies in finance, shipping,
retail/e-retail, health care, airline
reservations, etc
• FAA: http://fusesource.com/collateral/131
• Sabre: http://fusesource.com/collateral/139
• CERN: http://fusesource.com/collateral/103
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Open source
• Apache Software Foundation
• ASL v 2.0 Licensed
• Vibrant community
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•
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Jira, mailing list, github
Lots of contributions! Check out the components!

Pipes and Filters
• Step by Step – “Processors” in Camel terminology
• Complex processing – “Routes”
• Flexible
• Testing
• Reuse
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Camel Routes
• Defined in Java, XML, Scala, Groovy
• Step by step processing of a message:
• Consumer – Listen for incoming message
• Zero or more “filters” or Processors
• Producer – Send outgoing message
• Number of processing filters, or “Processors” in
Camel-speak
• EIPs
• Tranform, redirect, enrich
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Domain Specific Language
• Domain specific (integration)
• Used to build and describe Camel Routes
• Embedded within a general programming language
• Java, Spring XML, Scala, Groovy
• Take advantage of existing tools
• Fluent builders (builder pattern…)
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from(“..”).enrich(“…”).filter(“..”).to(“…”);

Java DSL
public class OrderProcessorRouteBuilder extends RouteBuilder {
@Override
public void configure() throws Exception {
from(“activemq:orders”)
.choice()
.when(header(“customer-rating”).isEqualTo(“gold”))
.to(“ibmmq:topic:specialCustomer”)
.otherwise()
.to(“ftp://user@host/orders/regularCustomers”)
.end()
.log(“received new order ${body.orderId}”)
.to(“ibatis:storeOrder?statementType=Insert”);
}
}
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Spring XML DSL
<route id=“processOrders”>
<from uri=“activemq:orders”/>
<choice>
<when>
<simple>${header.customer-rating} == ‘gold’</simple>
<to uri=“ibmmq:topic:specialCustomer”>
</when>
<otherwise>
<to uri=“ftp://user@host/orders/regularCustomers” />
</otherwise>
</choice>
<log message=“received new order ${body.orderId}”/>
<to uri=“ibatis:storeOrder?statementType=Insert”/>
</route>
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Enterprise Integration Patterns
• Message Routing
• Transformation
• Aggregation
• Splitting
• Resequencer
• Routing Slip
• Enricher
• All from the book!
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Components
• Prepackaged bits of code
• Highly configurable
• Maximum interoperability
• Used to build “Adapters” to existing systems
• Don’t reinvent the wheel and end up with a box
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Components
http://camel.apache.org/components.html
• ActiveMQ, Websphere, Weblogic (JMS)
• AMQP
• HTTP
• ATOM feeds
• IRC
• AWS (S3, SQS, SNS, others)
• jclouds
• Bean
• JDBC
• Cache (EHCache)
• Jetty
• CXF (JAX-WS, JAX-RS)
• Twitter
• EJB
• MQTT
• Drools
• MyBatis
• File
• JPA
• FTP
• Spring Integration
• Google App Engine
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• GMail
• Spring Web Services
To see list of all
components!!

Components
• URI format:
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scheme:localPart[?options]
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scheme: identifies the “component”
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localPart: specific to the component
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options: is a list of name-value pairs
• Creates endpoints based on configuration
• Route endpoint “factories”
• Integrate with Camel Routes by creating producer/
consumer endpoints
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Another Example
public class MyExampleRouteBuilder extends RouteBuilder {
@Override
public void configure() throws Exception {
from(“aws-sqs://demo?defaultVisibilityTimeout=2”)
}
}
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.setHeader(“type”).jsonpath(“$[‘type’]”)
.filter(simple(“${header.type} == ‘login’”)
.to(“jms:quote”);

Test Framework
• Powerful way to test your Camel routes
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http://camel.apache.org/mock.html
• Uses Mocks
• Mocks vs Stubs?
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http://martinfowler.com/articles/mocksArentStubs.html
• Provides declarative testing mechanism
• Declare
• Test
• Assert
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Management with HawtIO
http://hawt.io
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Developer Tooling Support
Fuse IDE
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JBoss Fuse (aka Fuse ESB)
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JBoss Fuse (aka Fuse ESB)
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Live Demo
can be found here:
https://github.com/christian-posta/camel-sqs-example
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Resources
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Dzone Refcardz
REFCARDZ
• Camel Essential Components
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http://refcardz.dzone.com/refcardz/essential-camel-components
• Essential EIP with Apache Camel
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http://refcardz.dzone.com/refcardz/enterprise-integration
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Apache Community
• http://camel.apache.org
• Mailing list: users@camel.apache.org
• Nabble Archive:
http://camel.465427.n5.nabble.com/Camel-Users-f465428.html
• Source code: http://svn.apache.org/viewvc/camel/trunk/
• Blogs, Articles, Examples
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http://camel.apache.org/articles.html
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http://camel.apache.org/user-stories.html
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http://camel.apache.org/user-stories.html
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http://www.davsclaus.com
•
http://www.christianposta.com/blog
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Apache Camel Books
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Apache Camel Books
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Questions
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