1. Technologie Workshops
Apache Camel

2. Einleitung: Enterprise Application Integration
CORBA
System ABC
System XYZ System 567
Systemlandschaften aus:
RMI
SOAP
•System XYZ
unterschiedlichen System 123
System
• mit unterschiedlichen Schnittstellen JDBC
• in unterschiedlichen Technologien
POP3, SMTP JMS
JMS Message Datei- DB
Mail Gateway
Broker system

3. Messaging
Entkopplung der Systeme
Schnittstellen (lose Kopplung)
Last
Asynchrone Kommunikation
Maximaler Durchsatz
Lastentkopplung, bessere Drosselung
bedingt offline-fähig
Ausfallsicherheit (Store and Forward)
Transaktional

4. Enterprise Integration Patterns (EIP)
Pattern-Katalog, Messaging Muster für die Integration von Systemen
http://www.eaipatterns.com/
http://camel.apache.org/enterprise-integration-patterns.html

5. Apche Camel
„Die smarteste Versuchung für
Systemintegration“ JavaMagazin 4/2012, Kai Wähner
Referenzimplementierung der EIP

6. API
RouteBuilder#configure(){
from(EP1).to(EP2);
from(EP1).bean(myBean, "doSomething");
from(EP1).process(myProcessor);
from(EP1).transform(myBean, "doSomething");
from(EP1).recipientList(simple("direct:${header.operationName}"));
from(EP1).multicast().to(EP2, EP3,EP4);
…
}

7. Spring DSL
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="EP-URI1"/>
<to uri="EP-URI2"/>
</route>
</camelContext>
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="EP-URI1"/>
<to uri="myBean"/>
</route>
</camelContext>
<bean id="myBean" class="…"/>

8. Spring DSL
Transform
<route>
<from uri="EP-URI1"/>
<bean ref="myBeanName" method="doTransform"/>
<to uri="EP-URI2"/>
</route>
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="EP-URI1"/>
<transform>
<simple>${in.body} extra data!</simple>
</transform>
<to uri="EP-URI2"/>
</route>
</camelContext>

9. Spring DSL
Dynamic Recipient List
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="EP-URI1"/>
<multicast>
<to uri="EP-URI2"/>
<to uri="EP-URI3"/>
<to uri="EP-URI4"/>
</multicast>
</route>
</camelContext>

10. Spring DSL
Static Recipient List
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="EP-URI1"/>
<recipientList>
<xpath>$foo</xpath>
</recipientList>
</route>
<route>
<from uri="EP-URI2" />
<recipientList delimiter=",">
<header>myHeader</header>
</recipientList>
</route>
</camelContext>

11. Aufgabe Ticketsystem
Nachrichten per Webservice in das System
WS-Antwort mit Ticket-ID
Backup im Filesystem
Versand per E-Mail

12. Aufbau
class Architektur
Apache Camel
camel-cxf camel-mail
RouteBuilder
+ configure()() : void
«interface» IncidentMessage
IncidentRoute
IncidentServ ice
- message: String
+ configure()() : void + addIncident(IncidentMessage) : Integer
- priority: Integer
WS Endpoint erzeugen
String uri = "cxf:/incindent?serviceClass="+IncidentService.class.getName();
from(uri)....

13. Marko Seifert
Public Space Solutions
T-Systems Multimedia Solutions GmbH
Riesaer Straße 5
01129 Dresden