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And here we configure the charset encoding to use, and iso-8859-1 is commonly used.

The endpoint hl7listener can then be used in a route as a consumer, as this java DSL example illustrates:

    from("hl7socket").to("patientLookupService");

This is a very simple route that will listen for HL7 and route it to a service named patientLookupService that is also a spring bean id we have configured in the spring xml as:

    <bean id="patientLookupService" class="com.mycompany.healtcare.service.PatientLookupService"/>

And another powerful feature of Camel is that we can have our busines logic in POJO classes that is not at all tied to Camel as shown here:

public class PatientLookupService {
    public Message lookupPatient(Message input) throws HL7Exception {
        QRD qrd = (QRD)input.get("QRD");
        String patientId = qrd.getWhoSubjectFilter(0).getIDNumber().getValue();

        // find patient data based on the patient id and create a HL7 model object with the response
        Message response = ... create and set response data
        return response
    }

Notice that this class is just using imports from the HAPI library and none from Camel.

HL7 Model

The HL7 model is Java objects from the HAPI library. Using this library we can encode and decode from the EDI format (ER7) that is mostly used with HL7.
With this model you can code with Java objects instead of the EDI based HL7 format that can be hard for humans to read and understand.

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