PA165 Integration Lab
- Apache Camel
Filip Nguyen
Lab Software Architectures and Information Systems
Seminar 14
December 17, 2013
Today
● Review the Lecture
● Play with Apache Camel
Source code
● https://github.com/nguyenfilip/pa165camel.git
● Contains solved/done seminar lab
○ camel-standalone
○ camel-webapp
Standardization
● We want to add <items> element around all
the items
<order>
<items>
<item><product>Skis</product><quantity>20</quantity></item>
<item><product>Skis2</product><quantity>20</quantity></item>
</items>
</order>
Enrichment
● We want to add <created> element
<order>
<created>17-12-2013</created>
<items>
<item><product>Skis</product><quantity>20</quantity></item>
<item><product>Skis2</product><quantity>20</quantity></item>
</items>
</order>
Problem
● We have a folder with orders in old format as
well as folder with orders in new format (but
without “created”)
New format:
<order>
<items>
<item><product>Skis</product><quantity>20</quantity></item>
<item><product>Skis2</product><quantity>20</quantity></item>
</items>
</order>
Another Problem
● Also, we want to allow our customers to
submit ordres using
○ Web Services
○ CSV files
Orders formats
● Inspect camel-standalone/orders directory
Camel in Standalone Java
● Inspect pa165-camel-lab/pom.xml
● mvn exec:java -Dexec.mainClass=cz.pa165.mains.StandaloneMain
● StandaloneMain.java
● CamelContext
● Watch out for following folders in camel-
standalone
○ new-input-orders
○ old-input-orders
○ outputDir
○ errored
File Component
● Various parameters:
○ ?recursive=true&flatten=true"
● CamelFileName header
Validator
● Validates agaist XSD
● orderSchema.xsd
● Searches the XSD on classpath
JAXB
● JaxbDataFormat
● .unmarshal(jaxb)
● .marshal(jaxb)
Camel in Spring
● applicationContext-standalone.xml
● SpringMain
● We need to use Thread.sleep again!
● @EndpointInject in Spring Bean to inject a
Camel Endpoint
Camel in Web App
● inspect camel-web/pom.xml
● spring-ws-context.xml
<import resource="classpath:applicationContext-standalone.xml" />
Camel + Spring WS
● web.xml
● spring-ws-context.xml
DefaultWsdl11Definition
● Contract for web service in:
src/main/webapp/WEB-INF/order.xsd
● JAXB classes are used to map
request/response
What we need to do
● Convert request to our format (old or new
xml format)
● Route the converted message to our existing
commonRoute
● We need to return a sensible response to
the Web Service Client
Making a Request
● tomcat7:run in camel-web
● modify request.xml
curl -H "Content-Type: text/xml" -X POST -d @request.xml http://localhost:8080/camel/order
Create a new CSV route
● This should be done in standalone Camel
● Assume we are getting orders in CSV format
from yet another folder
● Use CSV camel component and convert the
csv into XML format :-)
<product>, <quantity>