38.4. Sort Messages by Operation Name

The operationName header

When the WS endpoint parses an incoming operation invocation in POJO mode, it automatically sets the operationName header to the name of the invoked operation. You can then use this header to sort messages by operation name.

Sorting by operation name

For example, the customer-ws-camel-cxf-pojo demonstration defines the following route, which uses the content-based router pattern to sort incoming messages, based on the operation name. The when predicates check the value of the operationName header using simple language expressions, sorting messages into invocations on the updateCustomer operation, the lookupCustomer operation, or the getCustomerStatus operation.
<beans ...>
    ...
    <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
        <route>
            <from uri="cxf:bean:customer-ws"/>
            <choice>
                <when>
                    <simple>${in.header.operationName} == 'updateCustomer'</simple>
                    <to uri="updateCustomer"/>
                </when>
                <when>
                    <simple>${in.header.operationName} == 'lookupCustomer'</simple>
                    <to uri="lookupCustomer"/>
                </when>
                <when>
                    <simple>${in.header.operationName} == 'getCustomerStatus'</simple>
                    <to uri="getCustomerStatus"/>
                </when>
            </choice>
        </route>
    </camelContext>

    <bean id="updateCustomer"
        class="com.fusesource.customerwscamelcxfpojo.UpdateCustomerProcessor"/>

    <bean id="getCustomerStatus"
        class="com.fusesource.customerwscamelcxfpojo.GetCustomerStatusProcessor"/>

    <bean id="lookupCustomer"
        class="com.fusesource.customerwscamelcxfpojo.LookupCustomerProcessor"/>
    
</beans>

Beans as endpoints

Note how the preceding route uses a convenient shortcut to divert each branch of the choice DSL to a different processor bean. The DSL for sending exchanges to producer endpoints (for example, <to uri="Destination"/>) is integrated with the bean registry: if the Destination does not resolve to an endpoint or a component, the Destination is used as a bean ID to look up the bean registry. In this example, the exchange is routed to processor beans (which implement the org.apache.camel.Processor interface).