[CONF] Apache Camel: Normalizer (page edited)

Mon, 10 Nov 2008 10:18:05 -0800

Page Edited : CAMEL : Normalizer

Normalizer has been edited by Jonathan Anstey (Nov 10, 2008).

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Content:

Normalizer

Camel supports the Normalizer from the EIP patterns by using a Message Router in front of a number of Message Translator instances.

Example

This example shows a Message Normalizer that converts two types of XML messages into a common format. Messages in this common format are then filtered.

Using the Fluent Builders

// before we can filter, we need to normalize the incoming messages
from("direct:start").choice()
  .when().xpath("/employee").to("bean:normalizer?method=employeeToPerson").to("seda:queue")
  .when().xpath("/customer").to("bean:normalizer?method=customerToPerson").to("seda:queue");

// filter the normalized messages
from("seda:queue").filter().xpath("/[EMAIL PROTECTED]'Jon']").to("mock:result");

In this case we're using a Java bean as the normalizer. The class looks like this

public class MyNormalizer {
    public void employeeToPerson(Exchange exchange, @XPath("/employee/name/text()") String name) {
        exchange.getOut().setBody(createPerson(name));            
    }

    public void customerToPerson(Exchange exchange, @XPath("/customer/@name") String name) {
        exchange.getOut().setBody(createPerson(name));
    }        
    
    private String createPerson(String name) {
        return "<person name=\"" + name + "\"/>";
    }
}

Using the Spring XML Extensions

The same example in the Spring DSL

<camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <choice>
      <when>
        <xpath>/employee</xpath>
        <to uri="bean:normalizer?method=employeeToPerson"/>
        <to uri="seda:queue"/>
      </when>
      <when>
        <xpath>/customer</xpath>
        <to uri="bean:normalizer?method=customerToPerson"/>
        <to uri="seda:queue"/>
      </when>
    </choice>
  </route>
  <route>
    <from uri="seda:queue"/>
    <filter>
      <xpath>/[EMAIL PROTECTED]'Jon']</xpath>
      <to uri="mock:result"/>
    </filter>
  </route>    
</camelContext>

<bean id="normalizer" class="org.apache.camel.processor.MyNormalizer"/>

See Also

Using This Pattern

If you would like to use this EIP Pattern then please read the Getting Started, you may also find the Architecture useful particularly the description of Endpoint and URIs. Then you could try out some of the Examples first before trying this pattern out.

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