The document provides an overview of Apache Camel, an open source framework for routing and mediating messages between different endpoints. It discusses what Camel is, how it works, common routing patterns supported like content-based routing, various components it supports, transaction management capabilities, and compares it to other similar frameworks.

1. Apache Camel Taking Camel for a ride Hands on Xke Alexis Kinsella June 11, 2010

2. www.xebia.fr / blog.xebia.fr What is camel ?

6. www.xebia.fr / blog.xebia.fr Some informations before you start ...

14. www.xebia.fr / blog.xebia.fr The basics

15. Message Routing www.xebia.fr / blog.xebia.fr Endpoint B Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget eros. Mauris scelerisque justo et ipsum scelerisque aliquam. In at auctor diam. Suspendisse ut justo sed diam Endpoint A Message

16. Camel Components www.xebia.fr / blog.xebia.fr

18. Simple Routing www.xebia.fr / blog.xebia.fr Endpoint B Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget eros. Mauris scelerisque justo et ipsum scelerisque aliquam. In at auctor diam. Suspendisse ut justo sed diam Endpoint A Message File Jms

19. Pipeline www.xebia.fr / blog.xebia.fr Endpoint B Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget eros. Mauris scelerisque justo et ipsum scelerisque aliquam. In at auctor diam. Suspendisse ut justo sed diam Endpoint A Message Endpoint C Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget eros. Mauris scelerisque justo et ipsum scelerisque aliquam. In at auctor diam. Suspendisse ut justo sed diam Endpoint D Message Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget

20. Multicast www.xebia.fr / blog.xebia.fr Endpoint B Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed magna urna, varius a facilisis nec, sagittis eget eros. Mauris scelerisque justo et ipsum scelerisque aliquam. In at auctor diam. Suspendisse ut justo sed diam Endpoint A Message Endpoint B Endpoint B File IBatis SMTP SFTP

21. Message filter: Spring XML www.xebia.fr / blog.xebia.fr <? xml version = &quot;1.0&quot; encoding = &quot;UTF-8&quot; ?> < beans xmlns = &quot;http://www.springframework.org/schema/beans&quot; xmlns:xsi = &quot;http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:schemaLocation = &quot;…&quot; > < camelContext xmlns = &quot;http://activemq.apache.org/camel/schema/spring&quot; > < route > < from uri = &quot;activemq:topic:Quotes&quot; /> < filter > < xpath > /quote/product = ‘widget’ </ xpath > < to uri = &quot;mqseries:WidgetQuotes&quot; /> </ filter > </ route > </ camelContext > </ beans >

22. Message filter: Java DSL www.xebia.fr / blog.xebia.fr package com.acme.quotes; import org.apache.camel.builder.RouteBuilder; public class MyRouteBuilder extends RouteBuilder { public void configure() { // forward widget quotes to MQSeries from( &quot;activemq:topic:Quotes&quot; ). filter().xpath( &quot;/quote/product = ‘widget’&quot; ). to( &quot;mqseries:WidgetQuotes&quot; ); } }

23. Content Based Router: Java www.xebia.fr / blog.xebia.fr from( &quot;activemq:NewOrders&quot; ). choice().when().xpath( &quot;/quote/product = 'widget'&quot; ). to( &quot;activemq:Orders.Widgets&quot; ). choice().when().xpath( &quot;/quote/product = 'gadget'&quot; ). to( &quot;activemq:Orders.Gadgets&quot; ). otherwise(). to( &quot;activemq:Orders.Bad&quot; );

24. Content Based Router: Spring XML www.xebia.fr / blog.xebia.fr <? xml version = &quot;1.0&quot; encoding = &quot;UTF-8&quot; ?> < beans xmlns = &quot;http://www.springframework.org/schema/beans&quot; xmlns:xsi = &quot;http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:schemaLocation = &quot;...&quot; > < camelContext xmlns = &quot;http://activemq.apache.org/camel/schema/spring&quot; > < route > < from uri = &quot;activemq:NewOrders&quot; /> < choice > < when > < xpath > /order/product = 'widget' </ xpath > < to uri = &quot;activemq:Orders.Widgets&quot; /> </ when > < when > < xpath > /order/product = 'gadget' </ xpath > < to uri = &quot;activemq:Orders.Gadgets&quot; /> </ when > < otherwise > < to uri = &quot;activemq:Orders.Bad&quot; /> </ otherwise > </ choice > </ route > </ camelContext > </ beans >

29. Predicates examples www.xebia.fr / blog.xebia.fr from( &quot;jms:queue:order&quot; ) .choice() .when(header( &quot;type&quot; ).isEqualTo( &quot;widget&quot; )).to( &quot;bean:widgetOrder&quot; ) .when(header( &quot;type&quot; ).isEqualTo( &quot;wombat&quot; )).to( &quot;bean:wombatOrder&quot; ) .otherwise() .to( &quot;bean:miscOrder&quot; ) .end(); Predicate isWidget = header( &quot;type&quot; ).isEqualTo( &quot;widget&quot; ); from( &quot;jms:queue:order&quot; ) .choice() .when( isWidget ).to( &quot;bean:widgetOrder&quot; ) .when( isWombat ).to( &quot;bean:wombatOrder&quot; ) .otherwise() .to( &quot;bean:miscOrder&quot; ) .end();

38. @Bean annotation www.xebia.fr / blog.xebia.fr public class Foo { @ MessageDriven ( uri = &quot;activemq:my.queue&quot; ) public void doSomething( @Bean ( &quot;myCorrelationIdGenerator&quot; ) String correlationID, @Body String body) { // process the inbound message here } } public class MyIdGenerator { private UserManager userManager ; public String generate( @ Header ( name = &quot;user&quot; ) String user, @Body String payload) throws Exception { User user = userManager .lookupUser(user); String id = user.getPrimaryId() + generateHashCodeForPayload (payload); return id; } }

41. Testing with camel www.xebia.fr / blog.xebia.fr public class FilterTest extends CamelTestSupport { @EndpointInject (uri = &quot;mock:result&quot; ) protected MockEndpoint resultEndpoint ; @Produce (uri = &quot;direct:start&quot; ) protected ProducerTemplate template ; public void testSendMatchingMessage() throws Exception { String expectedBody = &quot;<matched/>&quot; ; resultEndpoint .expectedBodiesReceived(expectedBody); template .sendBodyAndHeader(expectedBody, &quot;foo&quot; , &quot;bar&quot; ); resultEndpoint .assertIsSatisfied(); } public void testSendNotMatchingMessage() throws Exception { resultEndpoint .expectedMessageCount(0); template .sendBodyAndHeader( &quot;<notMatched/>&quot; , &quot;foo&quot; , &quot;notMatchedHeaderValue&quot; ); resultEndpoint .assertIsSatisfied(); } @Override protected RouteBuilder createRouteBuilder() { return new RouteBuilder() { public void configure() { from( &quot;direct:start&quot; ).filter(header( &quot;foo&quot; ).isEqualTo( &quot;bar&quot; )).to( &quot;mock:result&quot; ); } }; } }

42. Spring Test with Java Config www.xebia.fr / blog.xebia.fr @ ContextConfiguration ( locations = &quot;org.apache.camel.spring.javaconfig.patterns.FilterTest$ContextConfig&quot; , loader = JavaConfigContextLoader . class ) public class FilterTest extends AbstractJUnit4SpringContextTests { @EndpointInject (uri = &quot;mock:result&quot; ) protected MockEndpoint resultEndpoint ; @Produce (uri = &quot;direct:start&quot; ) protected ProducerTemplate template ; @ DirtiesContext @Test public void testSendMatchingMessage() throws Exception { String expectedBody = &quot;<matched/>&quot; ; resultEndpoint .expectedBodiesReceived(expectedBody); template .sendBodyAndHeader(expectedBody, &quot;foo&quot; , &quot;bar&quot; ); resultEndpoint .assertIsSatisfied(); } @ Configuration public static class ContextConfig extends SingleRouteCamelConfiguration { @Bean public RouteBuilder route() { return new RouteBuilder() { public void configure() { from( &quot;direct:start&quot; ).filter(header( &quot;foo&quot; ).isEqualTo( &quot;bar&quot; )).to( &quot;mock:result&quot; ); } }; } } }

47. www.xebia.fr / blog.xebia.fr Going further with Apache Camel …

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