Apache Camel - WJax 2008

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Apache Camel

Das Buch Gregor Hohpe, Bobby Woolf Enterprise Integration Patterns “ The Bible for Enterprise Application Integration” (amazon.com)‏

Messaging
remove
location dependencies
data format dependencies
temporal dependencies

Enterprise Integration Patterns
65 patterns
Messaging Endpoints
Message Construction
Messaging Channels
Message Routing
Message Transformation
System Management

Enterprise Integration Patterns (Basics)‏
Channel
Message
Pipes and Filters
Message Router
Message Translator
Message Endpoint

EIP (Routing/Transformation)‏
Message Filter
Splitter
Aggregator
Resequencer
Content Enricher
Content Filter
Normalizer

Beispiel (VeS)‏
Vollständig erfundenes Stammdatensystem

Apache Camel
Wurzeln in servicemix-eip, activemq
activemq, servicemix, cxf communities
implementiert 40 EIP
camel-core: commons-logging, jaxb, activation
1.3.0 April 2008 (208 tasks), 1.4.0 Juli 2008 (261 tasks), 1.5.0 Oktober 2008 (266 tasks)‏
kommerzieller Support

Camel (Konzepte)‏
CamelContext
Component
Endpoint
Message/Exchange
Processor
RouteBuilder/Java DSL

CamelContext
Spring:
<camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
</camelContext>
Pure Java:
CamelContext camel = new DefaultCamelContext();
camelContext.start();

Component
Spring:
<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>
Pure Java:
Component mailComponent = new org.apache.camel.component.mail.MailComponent();

Endpoint
Spring:
<cxf:cxfEndpoint id="routerEndpoint" address="http://localhost:9003/CamelContext/RouterPort"
serviceClass="org.apache.hello_world_soap_http.GreeterImpl"/>
URI:
cxf:bean:routerEndpoint
Pure Java:
Endpoint endpoint = component.createEndpoint("log:com.mycompany.part2");
URI:
log:com.mycompany.part2

Message/Exchange/Processor
Pure Java:
Exchange exchange = endpoint.createExchange();
exchange.getIn().setBody(name);
public class MyProcessor implements Processor {
public void process(Exchange exchange) throws Exception {
// do something...
}
}
Processor myProcessor = new MyProcessor();

RouteBuilder
Spring:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
<route>
<from uri="activemq:Input"/>
<bean ref="myBeanName" method="doTransform"/>
<to uri="activemq:Output"/>
</route>
</camelContext>

RouteBuilder (Java DSL)‏
Pure Java:
from("activemq:Input").beanRef("myBeanName", "doTransform").to("activemq:Output");
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("queue:a").filter(header("foo").isEqualTo("bar")).to("queue:b");
from("queue:c").choice()‏
.when(header("foo").isEqualTo("bar")).to("queue:d")‏
.when(header("foo").isEqualTo("cheese")).to("queue:e")‏
.otherwise().to("queue:f");
}
};
myCamelContext.addRoutes(builder);

RouteBuilder (Scala DSL beta)‏
class MyRouteBuilder extends RouteBuilder {
"direct:a" --> "mock:a"
"direct:b" to "mock:b"
}

VeS (Splitter)‏
<camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
<route>
<from uri="cxf:requests"/>
<splitter>
<xpath>/login | /account</xpath>
<to uri="direct:splitrequest"/>
</splitter>
</route>
</camelContext>

VeS (Router)‏
from("direct:splitrequest").choice().when(xpath("/login")).to("seda:loginData")‏
.when(xpath("/account")).to("seda:accountData");
}
};

VeS (2. Router)‏
from("seda:accountData").choice().when(groovy(“request.account.id =~ /A.*/”))‏
.to("seda:oldAccountData")‏
.when(groovy("request.account.id =~ /B.*/")).to("seda:newAccountData");
}
};

VeS (Transformation)‏
<route>
<from uri="seda:loginData"/>
<bean ref="loginBackend" method="doTransform"/>
<to uri="seda:loginBackend"/>
</route>

Expression Languages
from("queue:a").filter( header("foo").isEqualTo("bar") ).to("queue:b");
Expression Language filter().el("${in.headers['My Header'] == 'bar'}")‏
OGNL filter().ognl("request.headers.foo = 'bar'")‏
Javascript filter().javaScript("request.headers.get('user') == 'admin'")‏
Groovy filter().groovy("request.lineItems.any { i -> i.value > 100 }")‏
Python filter().python("request.headers['user'] == 'admin'")‏
Ruby filter().ruby("$request.headers['user'] == 'admin'")‏
Xpath filter().xpath("//foo")‏
Xquery filter().xquery("//foo")‏
Scripting languages via JSR223

Components
ActiveMQ (activemq:FOO.BAR)‏
Atom (atom://atomUri)‏
CXF (cxf:bean:cxfEndpoint)‏
Spring events (spring-event://default)‏
File ( file://inputdir/?delete=true )‏
Financial Information eXchange (fix://configurationResource)‏

Components
Flatpack (flatpack:fixed:foo.pzmap.xml)‏
FTP (ftp://camelrider@localhost:21/public/downloads)‏
HL7 (Health Level 7)‏
HTTP/Jetty
JBI (jbi:service:http://foo.bar.org/Service)‏
Java Content Repository (jcr://user:pass@repository/repo)‏

Components
JMS (jms:FOO.BAR)‏
JPA (jpa:account)‏
LDAP (ldap:localhost:1024)‏
Log (log:org.camel.example.Foo)‏
Mail (imap://admin@mymailserver.com)‏
Mina (mina:tcp://localhost:6200?textline=true)‏
Mock (mock:foo)‏
RMI (rmi://localhost:1099/foo)‏

Components
Seda (seda:start)‏
Smooks (EDI parsing)‏
Test (test:file://data/expectedOutput)‏
Timer (timer://foo?fixedRate=true&period=60000)‏
Velocity (velocity:com/acme/MyResponse.vm)‏
Vm (vm:foo)‏
Xmpp (xmpp://fromAlias/toAlias)‏

Möglichkeiten
BAM (Wiretap Pattern)‏
Bean Integration
Visualisierung
Komponenten- erstellung

Fazit
Apache Camel ist
klein
leicht
fokussiert
modular
Don't get the hump, try Camel today.

Credits
the camel riders
IBM System 360 (CC cote on flickr)‏
the camel's way (CC lovelypetal on flickr)‏

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Apache Camel - WJax 2008

by inovex GmbH on Aug 19, 2009

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Apache Camel - WJax 2008 — Presentation Transcript