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127.8. Example 1: Reading Data from SAP

Overview
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This example demonstrates a route which reads FlightCustomer business object data from SAP. The route invokes the FlightCustomer BAPI method, BAPI_FLCUST_GETLIST, using an SAP synchronous RFC destination endpoint to retrieve the data.

Java DSL for route
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The Java DSL for the example route is as follows: 
from("direct:getFlightCustomerInfo")
    .to("bean:createFlightCustomerGetListRequest")
    .to("sap-srfc-destination:nplDest:BAPI_FLCUST_GETLIST")
    .to("bean:returnFlightCustomerInfo");
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XML DSL for route
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And the Spring DSL for the same route is as follows: 
<route>
    <from uri="direct:getFlightCustomerInfo"/>
    <to uri="bean:createFlightCustomerGetListRequest"/>
    <to uri="sap-srfc-destination:nplDest:BAPI_FLCUST_GETLIST"/>
    <to uri="bean:returnFlightCustomerInfo"/>
</route>
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createFlightCustomerGetListRequest bean
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The createFlightCustomerGetListRequest bean is responsible for building an SAP request object in its exchange method that is used in the RFC call of the subsequent SAP endpoint . The following code snippet demonstrates the sequence of operations to build the request object: 
public void create(Exchange exchange) throws Exception {

    // Get SAP Endpoint to be called from context.
    SAPEndpoint endpoint =
        exchange.getContext().getEndpoint("bean:returnFlightCustomerInfo",
                                                 SAPEndpoint.class);

    // Retrieve bean from message containing Flight Customer name to
    // look up. 
    BookFlightRequest bookFlightRequest =
        exchange.getIn().getBody(BookFlightRequest.class);

    // Create SAP Request object from target endpoint.
    Structure request = endpoint.getRequest();
    
    // Add Customer Name to request if set
    if (bookFlightRequest.getCustomerName() != null &&
        bookFlightRequest.getCustomerName().length() > 0) {
            request.put("CUSTOMER_NAME",
                          bookFlightRequest.getCustomerName());
        }
    } else {
        throw new Exception("No Customer Name");
    }
    
    // Put request object into body of exchange message.
    exchange.getIn().setBody(request);
}
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returnFlightCustomerInfo bean
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The returnFlightCustomerInfo bean is responsible for extracting data from the SAP response object in its exchange method that it receives from the previous SAP endpoint . The following code snippet demonstrates the sequence of operations to extract the data from the response object: 
public void createFlightCustomerInfo(Exchange exchange) throws Exception {
    
    // Retrieve SAP response object from body of exchange message.
    Structure flightCustomerGetListResponse =
        exchange.getIn().getBody(Structure.class);
    
    if (flightCustomerGetListResponse == null) {
        throw new Exception("No Flight Customer Get List Response");
    }
    
    // Check BAPI return parameter for errors 
    @SuppressWarnings("unchecked")
    Table<Structure> bapiReturn =
        flightCustomerGetListResponse.get("RETURN", Table.class);
    Structure bapiReturnEntry = bapiReturn.get(0);
    if (bapiReturnEntry.get("TYPE", String.class) != "S") {
        String message = bapiReturnEntry.get("MESSAGE", String.class);
        throw new Exception("BAPI call failed: " + message);
    }

    // Get customer list table from response object.
    @SuppressWarnings("unchecked")
    Table<? extends Structure> customerList =
        flightCustomerGetListResponse.get("CUSTOMER_LIST", Table.class);
    
    if (customerList == null || customerList.size() == 0) {
        throw new Exception("No Customer Info.");
    }
    
    // Get Flight Customer data from first row of table.
    Structure customer = customerList.get(0);
    
    // Create bean to hold Flight Customer data.
    FlightCustomerInfo flightCustomerInfo = new FlightCustomerInfo();
    
    // Get customer id from Flight Customer data and add to bean.
    String customerId = customer.get("CUSTOMERID", String.class);
    if (customerId != null) {
        flightCustomerInfo.setCustomerNumber(customerId);
    }
    
    ...
    
    // Put bean into body of exchange message.
    exchange.getIn().setHeader("flightCustomerInfo", flightCustomerInfo);
    
}
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