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Apache CamelThe Integration
Library
EU 2016
Claus Ibsen
Claus Ibsen• Senior Principal Software Engineer
at Red Hat
• Apache Camel8+ years commiter and PMC member
• Author ofCamel in Action books
@davsclausdavsclaus
davsclaus.comclaus.ibsen@gmail.com
Agenda• What is Apache Camel?
• Little Example
• Trying Apache Camel
• What's in the Camel Box?
• Running Camel
• More Information
What is Apache Camel?
• Quote from the website
Apache Camel is apowerful Open SourceIntegration Framework
based onEnterprise Integration Patterns
What is Apache Camel?
• Quote from the website
Apache Camel is apowerful Open SourceIntegration Framework
based onEnterprise Integration Patterns
Integration Framework
Enterprise Integration Patterns
Enterprise Integration Patterns
Content Based Router
Content Based Router
from newOrder
Content Based Router
from newOrder choice
Content Based Router
from newOrder choice when isWidget to widget
Content Based Router
from newOrder choice when isWidget to widget otherwise to gadget
Content Based Router
from(newOrder) choice when(isWidget) to(widget) otherwise to(gadget)
Content Based Router
from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
Content Based Router
Endpoint newOrder = endpoint("activemq:queue:newOrder");
from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
Content Based Router
Endpoint newOrder = endpoint("activemq:queue:newOrder");Predicate isWidget = xpath("/order/product = 'widget'");
from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
Content Based Router
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);
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); }
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); }}
Java DSLimport 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"); }}
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 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 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
Just Java Code
Just XML
Architecture
Componentsahc bindy coap docker
ahc-ws blueprint cometd dozerapns boon context dropbox
atmosphere box couchdb eclipseatom cache crypto ejbaws cassandraql csv elasticsearchbam castor cfx elsql
bean-validator cdi cxf-transport eventadminbeanio chunk disruptor exec
beanstalk cmis dns facebook
Componentsflatpack google-drive hbase jacksonxml
fop google-mail hdfs jasyptfreemarker gora hdfs2 javaspace
ftp grape http jaxbgae groovy http4 jbpm
ganglia gson ibatis jclouds
geocoder guava-eventbus ical jcr
git guice infinispan jdbcgithub hawtdb irc jetty8google-calendar hazelcast jackson jetty9
Componentsjgroups jsonpath leveldb mustache
jibx jt400 linkedin mveljing juel lucene mybatisjira jxpath mail nettyjms kafka metrics netty-httpjmx kestrel mina netty4jolt krati mina2 netty4-http
josql kubernetes mongodb ognljpa kura mqtt olingo2jsch ldap msv openshift
Componentsoptaplanner rabbitmq scala smpp
paho restlet schematron snpppaxlogging rmi scr soap
pdf routebox script solrpgevent rss servlet spark-restprinter ruby servletlistener spring
protobuf rx shiro spring-batchquartz salesforce sip spring-boot
quarz2 sap-netweaver sjms spring-integration
quickfix saxon slack spring-javaconfig
Componentsspring-ldap swagger undertow xmlsecurityspring-redis swagger-java univocity xmpp
spring-security syslog urlrewrite xstreamspring-ws tagsoup velocity yammer
sql tarfile vertx zipfilessh test weather zookeeperstax test-blueprint websocket
stomp test-spring xmlbeansstream testng xmljson
stringtemplate twitter xmlrpc
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Apache Camelon GitHub Numbers
• Project created March 2007
• 1058 Stars
• 102 Releases
• 25000+ Commits
• 253 Contributors
• 1254 Closed Pull Requests
A star on github is appreciated
Agenda• What is Apache Camel?
• Little Example
• Trying Apache Camel
• What's in the Camel Box?
• Running Camel
• More Information
File Copier Example
Public Static Void Main
Create CamelContext
Add RouteBuilder
Java DSL
Start / Stop
Camel Main
Agenda• What is Apache Camel?
• Little Example
• Trying Apache Camel
• What's in the Camel Box?
• Running Camel
• More Information
Trying Camel• Download Apache Camel 2.18.0
• tar xf apache-camel-2.18.0.tar.gz• cd apache-camel-2.18.0• cd examples
read readme.md first
Beginner Example• camel-example-console
mvn camel:run
Run with web console
mvn io.hawt:hawtio-maven-plugin:1.4.66:camel
http://hawt.io/maven
Spring Boot Starter
Spring Boot
WildFly Swarm Generator
WildFly Swarm CDI
Apache ServiceMix
• Download Apache ServiceMix 7.0.0.M2• unzip apache-servicemix-7.0.0.M2.zip• cd apache-servicemix-7.0.0.M2• cd examples/camel
read readme.txt first
Agenda• What is Apache Camel?
• Little Example
• Trying Apache Camel
• What's in the Camel Box?
• More Information
What's in the Camel Box?
Splitter
Splitter
from("file:inbox")
Splitter
from("file:inbox") .split(body().tokenize("\n"))
Splitter
from("file:inbox") .split(body().tokenize("\n")) .marshal(customToXml)
Custom Data Format
Splitter
from("file:inbox") .split(body().tokenize("\n")) .marshal(customToXml) .to("activemq:line");
Custom Data Format
Componentsahc bindy coap docker
ahc-ws blueprint cometd dozerapns boon context dropbox
atmosphere box couchdb eclipseatom cache crypto ejbaws cassandraql csv elasticsearchbam castor cfx elsql
bean-validator cdi cxf-transport eventadminbeanio chunk disruptor exec
beanstalk cmis dns facebook
camel-catalog:component-list | wc -l219
Data Formatsavro flatpack pgp univocity-fixed
barcode gzip protobuf univocity-tsvbase64 hl7 rss xmlBeansbeanio ical secureXML xmjson
bindy-csv jacksonxml serialization xmlrpcbindy-fixed jaxb soapjaxb xstreambindy-kvp jibx string zip
boon json-gson syslog zipfilecastor json-jackson tarfilecrypto json-xstream tidyMarkup
csv mime-multipart univocity-csv
camel-catalog:dataformat-list | wc -l47
Data Format with JAXB
• POJO class with @JAXB annotations
Data Format with JAXB
• marshal (xml -> pojo)• unmarshal (pojo -> xml)
Languagesbean header php sql
constant javaScript python terser
el jsonpath ref tokenize
exchangeProperty jxpath ruby xpath
file mvel simple xquery
groovy ognl spel xtokenize
camel-catalog:language-list | wc -l26
Language w/ Simple
Language w/ Groovyhere you can do groovy
programming
Camel DSLs
• Java DSL
• XML DSL (spring or OSGi blueprint)
• Groovy DSL
• Scala DSLGroovy and Scala
are not much in use
Java8 DSL in the works
ProducerTemplate• Client API (alike Spring Templates)
Send a message to any Camel endpoint
ProducerTemplate• Client API (alike Spring Templates)
FTP serverJavaApplication
How to upload a fileto a FTP server from Java code
ProducerTemplate
FTP server
JavaApplicatio
n
FluentProducerTemplate
FTP server
JavaApplicatio
n
Test Kit
camel-test camel-test-blueprintcamel-test-cdi camel-test-karaf
camel-test-spring camel-testng
camel-test
camel-testeasy to run or debug
camel-test1) set expectations
camel-test1) set expectations
2) send message(s)
camel-test1) set expectations
2) send message(s)
3) assert
Management• JMX
• Reliable Shutdown
Graceful Shutdown
Route A
Route B
Route C
2
1
3 4
5
6
Startup Shutdown
Stop accept new messages
Complete currentinflight messages
Camel Commands• Apache Karaf / ServiceMix
Camel Commands• Spring Boot
Rest DSL (XML)
Rest DSL (Java)
use REST verbs to define servicesthat becomes Camel routes
Rest DSL
configure RESTand turn on swagger api
Swagger Doc
swagger doc as json schema
Swagger Doc
embeddedswagger-ui
Rest DSL Example
cd examples/camel-example-swagger-xmlmvn jetty:run
Error Handling
Error Handling
Error Handling
Error Handling
Circuit Breaker• Netflixx Hystrix
New in Camel 2.18
Circuit Breaker• Integrates with Hystrix Dashboard
Maven Tooling• Archetypes
camel-archetype-java camel-archetype-componentcamel-archetype-spring camel-archetype-api-componentcamel-archetype-web camel-archetype-dataformatcamel-archetype-cdi
camel-archetype-spring-boot camel-archetype-scalacamel-archetype-blueprint camel-archetype-groovycamel-archetype-spring-dm
camel-archetype-scr camel-archetype-java8
New in Camel 2.18
Maven Tooling• camel-maven-plugin
mvn camel:run
Maven Tooling• fabric8-camel-maven-plugin
mvn fabric8-camel:validate
http://fabric8.io/guide/camelMavenPlugin.html
Validate your Camel uris
from the source
All the other stuffType Converter Transactions
Interceptors Security
Thread Management Route Policy
Java8 DSL Asynchronous Non-Blocking Routing Engine
POJO Routing Debugging & Tracing
Agenda• What is Apache Camel?
• Little Example
• Trying Apache Camel
• What's in the Camel Box?
• Running Camel
• More Information
Running CamelStandalone Web Application
Camel Spring XML JEE Application
Camel Spring Boot Apache Karaf / ServiceMix (OSGi)
Camel CDI WildFly / WildFly-Swarm(wildfly-camel)
Camel Guice vert.x(vertx-camel)
More Information
• My blog• http://www.davsclaus.com
• Apache Camel 3rd party blogs/articles/etc• http://camel.apache.org/articles
• Camel videos• https://vimeo.com/tag:apachecamel
• Best What is Camel article• https://dzone.com/articles/open-source-int
egration-apache
Also videos on Youtube
@davsclausdavsclaus
davsclaus.comclaus.ibsen@gmail.com
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