Apache Camel Introduction

Introduction to Apache Camel

Claus IbsenPrincipal Software Engineer, FuseSource

September 2010

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Today's speaker - Claus Ibsen

Principal Software Engineer at FuseSource

• Full time Apache Camel hacker

Apache Camel committer

Co-author of Camel in Action book

• Available in late 2010

Contact

• claus.ibsen@fusesource.com

• http://davsclaus.blogspot.com/

• http://twitter.com/davsclaus

http://www.manning.com/ibsen

Why the name Camel?

Camel is easy to remember and type

Agenda

The birth of Apache Camel

What is Apache Camel

A little example

What's included in the box?

Running Camel

Another Example

The Camel Community

Q and A

• Camel’s parents

Initial Commit Log

r519901 | jstrachan | 2007-03-19 11:54:57 +0100

(Mon, 19 Mar 2007) | 1 line

Initial checkin of Camel routing library

Apache Camel 1.0 released June 2007

Apache Camel is 3 years old

My initial commit

r640963 | davsclaus | 2008-03-25 21:07:10 +0100

(Tue, 25 Mar 2008) | 1 line

Added unit test for mistyped URI

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

Quote from the web site

Apache Camel is a

Powerful Open Source

Integration Framework

based on known

Enterprise Integration Patterns

Why do we need Integration?

• Your apps are build using different tech stacks

• Critical for your business to integrate

Why Integration Framework?

• Framework do the heavy lifting

• Focus on business problem

• Not "reinventing the wheel"

What is Enterprise Integration Patterns?

Its a book

Lets look at one of the patterns

Use Case

ActiveMQ WebSphereMQ

Filter Pattern

send to

filter

message

Filter Pattern

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

Filter Pattern

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

Filter Route

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

Filter Route

isWidget = xpath(“/quote/product = „widget‟”);

Filter Route

Endpoint A = endpoint(“activemq:queue:quote”);

Endpoint B = endpoint(“mq:quote”);

Predicate isWidget = xpath(“/quote/product = „widget‟”);

Filter Route - Java DSL

public void configure() throws Exception {

Endpoint A = endpoint("activemq:queue:quote");

Endpoint B = endpoint("mq:quote");

Predicate isWidget = xpath("/quote/product = „widget‟");

import org.apache.camel.builder.RouteBuilder;

import static org.apache.camel.builder.xml.XPathBuilder.xpath;

public class FilterRoute extends RouteBuilder {

Endpoint A = endpoint("activemq:queue:quote");

Endpoint B = endpoint("mq:quote");

Predicate isWidget = xpath("/quote/product = „widget‟");

import org.apache.camel.builder.RouteBuilder;

public class FilterRoute extends RouteBuilder {

from("activemq:queue:quote")

.filter().xpath("/quote/product =„widget‟")

.to("mq:quote");

IDE Tooling

Assistance

JavaDoc

IDE Tooling

Assistance

Lets look at the most famous pattern

Content Based Router

Content Based Router - Spring XML

<route>

<when>

<xpath>/order/product = 'widget'</xpath>

</when>

</otherwise>

</choice>

</route>

</camelContext>

Content Based Router - Java DSL

from("activemq:NewOrders")

.choice()

.when().xpath(“/order/product = 'widget'”)

.to(“activemq:Orders.Widget”)

.otherwise()

.to(“acitvemq:Orders.Gadget”);

Summary

• Camel is an integration framework

• Based on Enterprise Integration Patterns

• Routing and mediation

• Easy to use DSL to define routes

• No heavy specification

• No container dependency

• Payload agnostic

• Connectivity to a great wealth of transports

Mission Statement

Making integration easier and

more accessible to developers

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

A little example

Based on community user (Gunnar Hillert)

• http://hillert.blogspot.com/2009/09/camellos-discovering-apache-

camel-ii.html

• 1) Pickup files from a directory

• 2) Make sure we only pickup 3 files per 30 seconds

• 3) Store into JMS queue

• 4) Listen on JMS queue

• 5) And upload file to FTP server

A little example

Goals using Enterprise Integration Patterns

1 2 3 4 5

A little example

Goals using Enterprise Integration Patterns

from throttle to from to

A little example

Camel DSL in XML

<route>

<throttle maximumRequestsPerPeriod="3”

timePeriodMillis="30000”>

</throttle>

</route>

<route>

</route>

</camelContext>

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

Highlights of whats included in Camel

50+ EIP patterns

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

70+ Components

activemq crypto flatpack irc ldap

activemq-journal cxf freemarker javaspace mail/imap/pop3

amqp cxfrs ftp/ftps/sftp jbi mina

atom dataset gae jcr mock

bean direct hdfs jdbc msv

bean validation esper hibernate jetty nagios

browse event hl7 jms netty

cache exec http jpa nmr

cometd file ibatis jt/400 printer

http://camel.apache.org/components.html

70+ Components

properties scalate stream xslt

quartz seda string-template ejb

quickfix servlet test

ref smooks timer

restlet smpp validation

rmi snmp velocity

rnc spring-integration vm

rng spring-security xmpp

rss sql xquery

http://camel.apache.org/components.html

18 Data Formats

bindy protobuf

castor serialization

csv soap

crypto tidy markup

flatpack xml beans

gzip xml security

hl7 xstream

jaxb zip

json dozer

http://camel.apache.org/data-format.html

Data Format

from("activemq:QueueWithJavaObjects”)

.marshal().jaxb()

.to("mq:QueueWithXmlMessages");

Predicates & Expressions

BeanShell PHP

EL Python

Groovy Ruby

JavaScript Simple

JSR 223 SQL

OGNL XPath

MVEL XQuery

http://camel.apache.org/languages.html

DSL in 3 programming languages

from(A) filter(isWidget) --> B

<route>

<xpath>/quote/product = „widget‟</xpath>

</filter>

</route>

Type Converters

INFO DefaultTypeConverter

- Loaded 148 type converters

Custom Type Converters

# META-INF/services/org/apache/camel/TypeConverter

com.acme.convertersMETA-INF file in the JAR

@Converter

public class MyTypeConverter {

@Converter

public String toString(MyOrder order) {

StringBuilder sb = new StringBuilder();

return sb.toString();

Powerful bean integration

• Adapt to your beans

• EIP as @annotations

- @Produce

- @Consume

- @DynamicRouter

- @RecipientList

- @RoutingSlip

more to come in future releases ...

Bean as Message Translator

public class Foo {

public String someMethod(String name) {

return “Hello “ + name;

from("activemq:Incoming”).

beanRef("myBeanName”, “someMethod").

to("activemq:Outgoing");

Bean Parameter Binding with XPath

public class Foo {

public String processOrder(

String orderAsXml,

@XPath(“/order/@id") String oid,

@Header("JMSCorrelationID") String cid) {

Sending message

public class Foo {

@Produce(uri = "activemq:foo.bar")

ProducerTemplate producer;

public void doSomething() {

if (whatEver) {

producer.sendBody("Hello World");

Receiving message

public class Foo {

@Consume(uri = "activemq:cheese")

public void onCheese(String name) {

Test Kit

• camel-test.jar

• JUnit based (3.x and 4.x)

• Supports Spring

• Easy to test

• Quick prototyping

Test Kit from IDE

Right Click ->

extend CamelTestSupport

Inline RouteBuilder

Managed

• JMX API

• REST API

Web console

• REST API

FuseSource Rider

Summary

• 50+ EIP patterns

• 70+ Connectivity components

• 15+ Data formats

• 10+ Languages

• DSL in multiple flavors (Java, XML, Scala, Groovy)

• Automatic type conversion

• Strong bean support

• Test Kit

• Management (JMX, REST)

• Web console

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

Running Camel

Riding the Camel

Running Camel

Camel is not a server

Camel is lightweight and embeddable

Known Deployment Options

• Standalone Java Application

• Web Application

• J2EE Application

• JBI

• OSGi

• Google App Engine

• Java Web Start

• Spring Application

Known Containers

Apache ServiceMix

Apache ActiveMQ

Apache Tomcat

IBM WebSphere

BEA WebLogic

Oracle OC4j

... others

Running Camel

Java Application

Spring Application

CamelContext context = new DefaultCamelContext();

context.addRoutes(new MyRouteBuilder());

context.start();

<package>com.acme.quotes</package>

</camelContext>

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

Another Example

Rider Auto Parts Example by Jonathan Anstey

http://architects.dzone.com/articles/apache-camel-integration

Another Example

Rider Auto Parts Example - 3 Routes

Another Example

Rider Auto Parts Example - 1st Route

public class Route1 extends RouteBuilder {

from("ftp:user@rider.com?password=secret")

.to("activemq:queue:incoming");

Another Example

Rider Auto Parts Example - 2nd Route

tofrom

from("jetty:http://localhost:8080/orders")

.inOnly("activemq:queue:incoming")

.transform().constant("OK");

Another Example

Rider Auto Parts Example - 3rd Route

from to

choice

route on next slide

Another Example

Rider Auto Parts Example - 3rd Route

JaxbDataFormat jaxb = new JaxbDataFormat("com.rider");

from("activemq:queue:incoming")

.convertBodyTo(String.class)

.choice()

.when().method("helper”, "isXml")

.unmarshal(jaxb)

.to("activemq:queue:order")

.when().method("helper”, "isCsv")

.unmarshal().csv()

.beanRef("orderService”, "csvToXml")

.to("activemq:queue:order")

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

The Camel Community

Camel website

• 52% increase (2010 over 2009)

• Average 2200 visits per weekday (2000 - 2500)

High activity on mailing list

The Camel Community

20 committers

High commit activity

http://markmail.org/

The Camel Community

Books - Bestseller

• Manning top-15 year to date (2010)

The Camel Community

JIRA tickets

Total 3106

Open 136 (4%)

Resolved 2970 (96%)

Bugs 2 (2% open)

Oldest Bug Dec 2009

Sep 6th 2010

The Camel Community

A lot in each new release

Release Date Tickets

Camel 2.0 Aug 2009 760

Camel 2.1 Dec 2009 303

Camel 2.2 Feb 2010 180

Camel 2.3 May 2010 278

Camel 2.4 July 2010 182

Camel 2.5 Sep 2010 170+

The Camel Community

3rd party integrating Camel

• Apache ServiceMix

• Apache ActiveMQ

• Apache James

• OpenESB

• Progress Actional Diagnostics

• FuseHQ

• Open eHealth Integration Platform

• Grails Camel Plugin

• Play Framework

• Akka

• Scalate

• JBoss Drools

• JBoss ESB

In Progress

• Smooks

• Doozer

Agenda

A little example

Running Camel

Another Example

The Camel Community

Q and A

Where do I get more information?Camel website: http://camel.apache.org

Camel article: http://architects.dzone.com/articles/apache-camel-integration

FuseSource website: http://fusesource.com

Camel in Action book: http://manning.com/ibsen

Q and A

Apache Camel Introduction

Technology

Transcript of Apache Camel Introduction

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