1. Camel
as a Glue

2. Project. How we planned it

3. Project. How we imagine it.

4. Project. In practice.

5. Integration project. In practice.

6. How to handle it?

8. RTFM.
Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions

9. Specific tool
• Apache Camel
• Spring Integration
• Enterprise Service Bus (Mule ESB)
Read article

10. Apache Camel. Pros.
Pros
• Lighweight
• A lot components
• Support many Data Formats
• Good community
• DSL(XML, Java, Scala, Groovy)
• Spring integration

11. Apache Camel. Cons.
• Messy documentations

12. Basic example. XML DSL
camel-config.xml
<camelContext>
………………………………………………….
<route>
<from uri="servlet:///my_url" />
<bean ref=“urlHandler” method=“handle" />
<transform>
<constant>DONE</constant>
</transform>
</route>
………………………………………………….
</camelContext>

13. Basic example. JAVA DSL
public class MyRouteBuilder extends RouteBuilder{
public void configure() { from(" servlet:///my_url ").
process(new UrlHandler()).to("direct:b");
}
};
Or
public class MyRouteBuilder extends RouteBuilder{
public void configure() { from(" servlet:///my_url ").
processRef(“urlHandler”).to("direct:b");
}
};

14. Processor
@Component(“urlHandler”)
public class UrlHandler{
public void handle(Exchange ex){
ex.getIn();
//handle input
}
}

15. More complex example
<route>
<from uri="activemq:queue:queueName" />
<unmarshal ref="xstream-utf8" />
<bean ref=“firstProcessor" method="process" />
<bean ref=“secondProcessor" method="process" />
…………………………………………………………………………………….
<bean ref=“lastProcessor" method="process" />
<to uri="direct:anotherRoute" />
</route>

16. Components
• Amazon stack
• Apache stack(service miz, fop, cxf,)
• DBs(jdbc, jpa, ibatis)
• EJB
• File(ftp, ftps, file, hdfs)
• Google stack(gae, guice, gmail, gtask)
• Hazelcast
• JMS
• JMX
• Mail (IMAP, POP)
• Queues
• Twitter
• Many others

17. Components example
To poll, every 5 sec., all statuses on your home timeline
and send to gmail:
Java DSL
from("twitter://timeline/home?type=polling&delay=5&consumerKey=[s]&co
nsumerSecret=[s]&accessToken=[s]&accessTokenSecret=[s]").to("gmail://a
ccount1@gmail.com")
XML DSL
<route>
<from
uri="twitter://timeline/home?type=polling&delay=5&consumerKey=[s]&c
onsumerSecret=[s]&accessToken=[s]&accessTokenSecret=[s]"/>
<to uri=" gmail://account1@gmail.com "/>
</route>

18. Data Formats
• Standard java serialization
• Object marshalling (json, protobuf)
• Object xml marshalling (xstream, jaxb, jixb, castor, xmlbeans
• Object/XML/Webservice marshalling (SOAP)
• Direct JSON / XML marshalling
• Flat data structure marshalling (BeanIO, bindy, csv, edi, flatpack
dataformat)
• Domain specific marshalling (HL7)
• Compression (gzip, zip)
• Security (Crypto, PGP, XMLsecurity)
• Misc (custom dataformat, rss, syslog, tidymarkup)
• Dozer Type Conversion

19. Marshalling example
<route>
<from uri="direct:start"/>
<marshal ref="myJaxb"/>
<to uri="direct:marshalled"/>
</route>
<route>
<from uri="direct:marshalled"/>
<unmarshal ref="myJaxb"/>
<to uri="mock:result"/>
</route>

20. EIP
• Dynamic Router
• Recipient List
• Message Filter
• Wire Tap
• Throttler
• Load Balancer
• Multicast
• Others

21. Summary

22. Questions?