Takingapachecamelforaride

Slide 1: Taking Apache Camel For a Ride Bruce Snyder 11 April 2008 Amsterdam, The Netherlands

Slide 2: System Integration 2

Slide 3: 3

Slide 4: Apache Camel http://activemq.apache.org/camel/ 4

Slide 5: What is Apache Camel? 5

Slide 6: Enterprise Integration Patterns Text http://enterpriseintegrationpatterns.com/ 6

Slide 7: Patterns 7

Slide 8: Message Routing 8

Slide 9: Language Support • BeanShell • SQL • Javascript • XPath • Groovy • XQuery • Python • OGNL • PHP • JSR 223 scripting • Ruby 9

Slide 10: Apache Camel Components http://activemq.apache.org/camel/components.html 10

Slide 11: History of Apache Camel 11

Slide 12: The Camel Context CamelContext context = new DefaultCamelContext(); context.addRoutes(new MyRouteBuilder()); context.start(); <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <package>com.acme.quotes</package> </camelContext> 12

Slide 13: Pattern Examples 13

Slide 14: Patterns Again 14

Slide 15: Content Based Router RouteBuilder builder = new RouteBuilder() { public void configure() { from("seda:a").choice().when(header("foo") .isEqualTo("bar")).to("seda:b") .when(header("foo").isEqualTo("cheese")) .to("seda:c").otherwise().to("seda:d"); } }; 15

Slide 16: Content Based Router <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <route> <from uri="activemq:NewOrders"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:Orders.Widgets"/> </when> <when> <xpath>/order/product = 'gadget'</xpath> <to uri="activemq:Orders.Gadgets"/> </when> <otherwise> <to uri="activemq:Orders.Bad"/> </otherwise> </choice> </route> </camelContext> 16

Slide 17: Message Filter public class MyRouteBuilder extends RouteBuilder { public void configure() { from("activemq:topic:Quotes). filter().xpath("/quote/product = ‘widget’"). to("mqseries:WidgetQuotes"); } } 17

Slide 18: Message Filter <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <route> <from uri="activemq:topic:Quotes"/> <filter> <xpath>/quote/product = ‘widget’</xpath> <to uri="mqseries:WidgetQuotes"/> </filter> </route> </camelContext> 18

Slide 19: Splitter public class MyRouteBuilder extends RouteBuilder { public void configure() { from("file://orders"). splitter(body().tokenize("n")). to("activemq:Order.Items"); } } 19

Slide 20: Splitter Using XQuery public class MyRouteBuilder extends RouteBuilder { public void configure() { from("file://orders"). splitter().xquery("/order/items"). to("activemq:Order.Items"); } } 20

Slide 21: Aggregator public class MyRouteBuilder extends RouteBuilder { public void configure() { from("activemq:Inventory.Items"). aggregator().xpath("/order/@id"). to("activemq:Inventory.Order"); } } 21

Slide 22: Message Translator public class MyRouteBuilder extends RouteBuilder { public void configure() { from("file://incoming”). to("xslt:com/acme/mytransform.xsl"). to("http://outgoing.com/foo"); } } 22

Slide 23: Resequencer public class MyRouteBuilder extends RouteBuilder { public void configure() { from("direct:a”). resequencer(header("JMSPriority")). to("seda:b"); } } 23

Slide 24: Throttler public class MyRouteBuilder extends RouteBuilder { public void configure() { from("seda:a”). throttler(3).timePeriodMillis(30000). to("seda:b"); } } 24

Slide 25: Delayer public class MyRouteBuilder extends RouteBuilder { public void configure() { from("seda:a”). delayer(header("JMSTimestamp", 3000). to("seda:b"); } } 25

Slide 26: Combine Patterns public class MyRouteBuilder extends RouteBuilder { public void configure() { from("seda:a”). resequencer(header("JMSPriority")). delayer(3000). to("seda:b"); } } 26

Slide 27: Beans 27

Slide 28: Bean package com.mycompany.beans; public class MyBean { public void someMethod(String name) { ... } } <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <package>com.mycompany.beans</package> </camelContext> 28

Slide 29: Bean as a Message Translator public class MyRouteBuilder extends RouteBuilder { public void configure() { from("activemq:Incoming”). beanRef("myBean"). to("activemq:Outgoing"); } } 29

Slide 30: Bean as a Message Translator With Method Name public class MyRouteBuilder extends RouteBuilder { public void configure() { from("activemq:Incoming”). beanRef("myBean", "someMethod"). to("activemq:Outgoing"); } } 30

Slide 31: Type Conversion 31

Slide 32: Type Conversion @Converter public class IOConverter { @Converter public static InputStream toInputStream(File file) throws FileNotFoundException { return new BufferedInputStream( new FileInputStream(file)); } } 32

Slide 33: Binding Beans to Camel Endpoints public class Foo { @MessageDriven(uri="activemq:cheese") public void onCheese(String name) { ... } } 33

Slide 34: Binding Method Arguments public class Foo { public void onCheese( @XPath("/foo/bar") String name, @Header("JMSCorrelationID") String id) { ... } } http://activemq.apache.org/camel/bean-integration.html 34

Slide 35: Injecting Endpoints Into Beans public class Foo { @EndpointInject(uri="activemq:foo.bar") ProducerTemplate producer; public void doSomething() { if (whatever) { producer.sendBody("<hello>world!</hello>"); } } } 35

Slide 36: Spring Remoting - Client Side <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <proxy id="sayService" serviceUrl="activemq:MyService" serviceInterface="com.acme.MyServiceInterface"/> </camelContext> 36

Slide 37: Spring Remoting - Server Side <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <export id="sayService" uri="activemq:MyService" serviceRef="sayImpl" serviceInterface="com.acme.MyServiceInterface"/> </camelContext> <bean id="sayImpl" class="com.acme.MyServiceImpl"/> 37

Slide 38: Dependency Injection <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> ... </camelContext> <bean id="activemq" class="org.apache.camel.component.jms.JmsComponent"> <property name="connectionFactory"> <bean class="org.apache.activemq.ActiveMQConnectionFactory"> <property name="brokerURL" value="vm://localhost?broker.persistent=false"/> </bean> </property> </bean> 38

Slide 39: Business Activity Monitoring (BAM) 39

Slide 40: Business Activity Monitoring (BAM) public class MyActivities extends ProcessBuilder { public void configure() throws Exception { // lets define some activities, correlating on an // XPath query of the message body ActivityBuilder purchaseOrder = activity("activemq:PurchaseOrders") .correlate(xpath("/purchaseOrder/@id").stringResult()); ActivityBuilder invoice = activity("activemq:Invoices") .correlate(xpath("/invoice/@purchaseOrderId").stringResult()); // now lets add some BAM rules invoice.starts().after(purchaseOrder.completes()) .expectWithin(seconds(1)) .errorIfOver(seconds(2)).to("activemq:FailedProcesses"); } } 40

Slide 41: Ride the Camel! 41

Slide 42: Questions? 42