Apresentação do framework EIP, Apache Camel.

1. Apache Camel
rotas para as suas mensagens
Bruno Borges
2009

2. Apache Camel

3. Integração
MSMQ JMS
RSS
SOAP FTP
JT/400 JDBC
SMTP HTTP
FIX JBI
JPA TCP
Twitter LDAP
SOAP

4. Integração

5. Camel

6. ?

7. Framework Open Source
para
Padrões de Integração

8. EIP
● Enterprise Integration Patterns

9. Padrões
Roteamento de Mensagens
C o n te n t- b a seC o m o t ra t a r u m a situ a çã o o n d e a im p le m e n ta çã o d e u m a f u n çã o
d
R o u te r ló g ica e st á e sp a lh a d a e m m ú lt ip lo s siste m a s?
M e ssa g e F ilteCro m o e vit a r re ce b im e n to d e m e n sa g e n s in d e se ja d a s?
C o m o p r o ce ssa r u m a m e n sa g e m , se e sta co n t é m e le m e n to s q u e
S p litte r d e ve m se r p ro ce ssa d o s in d ivid u a lm e n t e d e fo rm a s d ife re n t e s?
C o m o co m b in a r o re su lta d o d e m e n sa g e n s in d ivid u a is, p o ré m
A g g re g a to r r e la cio n a d a s, n u m a ú n ica sa íd a ?
C o m o re to m a r a o r d e m d e m e n sa g e n s re la cio n a d a s e n via d a s f o ra d e
R e se q u e n ce r o rd e m ?
R e cip ie n t L ist o m o ro te a r u m a m e n sa g e m a u m a list a d in â m ica d e d e st in a rá rio s?
C

10. Roteamento
___________
___________
___________
___________
______
mensagem

11. Linguagens
● BeanShell ● SQL
● JavaScript ● XPath
● Groovy ● XQuery
● Python ● JSR 223 Scripting
● PHP ● OGNL
● Ruby ● EL (JSP/JSF)
● Scala

12. Componentes
● ActiveMQ ● JBI / JCR
● AMQP ● JDBC / JPA
● Atom / RSS ● JMS
● Beans ● JT/400
● Comet (Jetty) ● LDAP
● CXF ● LOG
● DataSet (testes) ● Mail
● Direct ● Mina
● File ● MSMQ
● FIX ● Quartz
● FTP / SFTP ● RMI
● Hibernate ● Velocity
● HL7 MLLP ● XMPP
● HTTP ● Xquery
● iBatis ● ... Twitter ?

13. Definição de Rotas
● CamelContext
public class CamelStartup {
public static void main(String... args) throws Exception {
CamelContext context = new DefaultCamelContext();
context.addRoutes(new MyRoute());
context.start();
}
}
● RouteBuilder
● DSL – Domain Specific Language
– Java
– Spring XML
– Scala

14. Definição de Rotas
● Java
public class TwitterRoute extends RouteBuilder {
public void configure() throws Exception {
from("file:outbox")
.transform(body().convertToString())
.to("twitter:tweetit");
from("twitter:tweets?follow=brunoborges")
.transform(body().convertToString())
.to("file:twitters-log");
}
}

15. Definição de Rotas
● Spring XML
<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>

16. Definição de Rotas
● Scala
class MyRouteBuilder extends RouteBuilder {
"direct:a" --> "mock:a"
"direct:b" to "mock:b"
}

17. Repetindo ...
Roteamento de Mensagens
C o n te n t- b a seC o m o t ra t a r u m a situ a çã o o n d e a im p le m e n ta çã o d e u m a f u n çã o
d
R o u te r ló g ica e st á e sp a lh a d a e m m ú lt ip lo s siste m a s?
M e ssa g e F ilteCro m o e vit a r re ce b im e n to d e m e n sa g e n s in d e se ja d a s?
C o m o p r o ce ssa r u m a m e n sa g e m , se e sta co n t é m e le m e n to s q u e
S p litte r d e ve m se r p ro ce ssa d o s in d ivid u a lm e n t e d e fo rm a s d ife re n t e s?
C o m o co m b in a r o re su lta d o d e m e n sa g e n s in d ivid u a is, p o ré m
A g g re g a to r r e la cio n a d a s, n u m a ú n ica sa íd a ?
C o m o re to m a r a o r d e m d e m e n sa g e n s re la cio n a d a s e n via d a s f o ra d e
R e se q u e n ce r o rd e m ?
R e cip ie n t L ist o m o ro te a r u m a m e n sa g e m a u m a list a d in â m ica d e d e st in a rá rio s?
C

18. Content-based Router
RouteBuilder route = 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");
}
};

19. 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>

20. Content-based Router
"direct:a" ==> {
to ("mock:polyglot")
choice {
when (_.in == "<hello/>") to ("mock:english")
when (_.in == "<hallo/>") {
to ("mock:dutch")
to ("mock:german")
}
otherwise to ("mock:french")
}
}

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

22. 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>

23. Message Filter
"direct:a" when(_.in == "<hello/>") to("mock:a")
"direct:b" ==> {
when(_.in == "<hallo/>") {
--> ("mock:b")
to ("mock:c")
} otherwise {
to ("mock:e")
}
to ("mock:d")
}

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

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

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

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

28. Recipient List
public class MyRouteBuilder extends RouteBuilder {
public void configure() {
from("direct:a")
.recipientList(header("destinos"));
}
}

29. Camel Twitter
CAMEL-1520

30. Padrões
Tradução de Mensagens
M e ssa g e C o m o sist e m a s u sa n d o d if e re n t e s f o r m a t o s d e m e n sa g e n s p o d e m
T ra n sla to r co m u n ica r-se e n t re si?
C o n te n t C o m o se co m u n ica r co m u m sist e m a se a m e n sa g e m d e o rig e m n ã o
E n rich e r d isp õ e d e to d o s o s d a d o s n e ce ssá rio s?
C o m o sim p lif ica r m e n sa g e n s m u it o g ra n d e s, q u a n d o so m e n te p o u co s
C o n te n t F ilte r a d o s in t e re ssa m ?
d
C o m o p ro ce ssa r m e n sa g e n s se m a n t ica m e n t e sim ila re s, m a s e m
N o rm a liz e r d if e re n t e s f o rm a t o s?

31. Message Translator

32. Content Enricher

33. Content Filter

34. Exemplos
from("direct:inicio")
.process(new Processor() {
public void process(Exchange exchange) {
Message in = exchange.getIn();
in.setBody(in.getBody(String.class) + " by Camel!");
}
})
.to("mock:result");
from("direct:inicio")
.transform(body().append(" Camel!"))
.to("mock:result");
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="direct:start" />
<transform>
<simple>${in.body} extra data!</simple>
</transform>
<to uri="mock:end" />
</route>
</camelContext>

35. Normalizer

36. Dependency Injection
Google Guice

37. Beans

38. Beans Tradutores
public class MinhaRota extends RouteBuilder {
@Override
public void configure() throws Exception {
from("activemq:Inbox")
.beanRef("meuBean")
.beanRef("meuOutroBean", "metodoQualquer")
.to("activemq:Outbox");
}
}

39. Beans Conversores
package org.apache.camel.component.twitter;
import java.text.ParseException;
import org.apache.camel.Converter;
@Converter
public class TwitterConverter {
@Converter
public static String toString(Status status)
throws ParseException {
return status.toString();
}
}

40. Anotações em Beans
public class Foo {
public void onBar(
@XPath("/foo/bar") String nome,
@Header("JMSCorrelationID") String id) {
// faz algo
}
}

41. Beans Consumidores
public class Foo {
@Consume(uri = "jms:queueFoo")
public void onFoo(
Exchange e,
@Header("JMSGroupID") String grupo) {
// faz algo
}
}

42. Camel, onde tem?
● Apache ServiceMix (ESB)
● OpenESB
● Apache ActiveMQ
● FUSE
● Java Embedded

43. Monte um Camelo!
Perguntas ?
Perguntas ?

44. Links
http://camel.apache.org
http://enterpriseintegrationpatterns.com
http://www.jawsys.com.br
http://blog.brunoborges.com.br