Chapter 287. SAP Component

Maven users need to add the following dependency to their pom.xml file to use this component:

<dependency>
    <groupId>org.fusesource</groupId>
    <artifactId>camel-sap</artifactId>
    <version>x.x.x</version>
<dependency>

Because the SAP component depends on the third-party JCo 3.0 and IDoc 3.0 libraries, it can only be installed on the platforms that these libraries support. For more details about the platform restrictions, see Red Hat JBoss Fuse Supported Configurations.

A prerequisite for using the SAP component is that the SAP Java Connector (SAP JCo) libraries and the SAP IDoc library are installed into the lib/ directory of the Java runtime. You must make sure that you download the appropriate set of SAP libraries for your target operating system from the SAP Service Marketplace.

The names of the library files vary depending on the target operating system, as shown in Table 287.1, “Required SAP Libraries”.

You can install the SAP JCo libraries and the SAP IDoc library into the JBoss Fuse OSGi container as follows:

To deploy the SAP component in a JBoss EAP container, perform the following steps:

There are two different kinds of endpoint provided by the SAP component: the Remote Function Call (RFC) endpoints, and the Intermediate Document (IDoc) endpoints.

The URI formats for the RFC endpoints are as follows:

sap-srfc-destination:destinationName:rfcName
sap-trfc-destination:destinationName:rfcName
sap-qrfc-destination:destinationName:queueName:rfcName
sap-srfc-server:serverName:rfcName[?options]
sap-trfc-server:serverName:rfcName[?options]

The URI formats for the IDoc endpoints are as follows:

sap-idoc-destination:destinationName:idocType[:idocTypeExtension[:systemRelease[:applicationRelease]]]
sap-idoclist-destination:destinationName:idocType[:idocTypeExtension[:systemRelease[:applicationRelease]]]
sap-qidoc-destination:destinationName:queueName:idocType[:idocTypeExtension[:systemRelease[:applicationRelease]]]
sap-qidoclist-destination:destinationName:queueName:idocType[:idocTypeExtension[:systemRelease[:applicationRelease]]]
sap-idoclist-server:serverName:idocType[:idocTypeExtension[:systemRelease[:applicationRelease]]][?options]

The URI formats prefixed by sap-endpointKind-destination are used to define destination endpoints (in other words, Camel producer endpoints) and destinationName is the name of a specific outbound connection to an SAP instance. Outbound connections are named and configured at the component level, as described in Section 287.2.2, “Destination Configuration”.

The URI formats prefixed by sap-endpointKind-server are used to define server endpoints (in other words, Camel consumer endpoints) and serverName is the name of a specific inbound connection from an SAP instance. Inbound connections are named and configured at the component level, as described in the Section 287.2.3, “Server Configuration”.

The other components of an RFC endpoint URI are as follows:

The other components of an IDoc endpoint URI are as follows:

The RFC destination endpoints (sap-srfc-destination, sap-trfc-destination, and sap-qrfc-destination) support the following URI options:

The SAP RFC server endpoints (sap-srfc-server and sap-trfc-server) support the following URI options:

The SAP IDoc List Server endpoint (sap-idoclist-server) supports the following URI options:

The SAP component package provides the following RFC and IDoc endpoints:

An RFC destination endpoint supports outbound communication to SAP, which enable these endpoints to make RFC calls out to ABAP function modules in SAP. An RFC destination endpoint is configured to make an RFC call to a specific ABAP function over a specific connection to an SAP instance. An RFC destination is a logical designation for an outbound connection and has a unique name. An RFC destination is specified by a set of connection parameters called destination data.

An RFC destination endpoint will extract an RFC request from the input message of the IN-OUT exchanges it receives and dispatch that request in a function call to SAP. The response from the function call will be returned in the output message of the exchange. Since SAP RFC destination endpoints only support outbound communication, an RFC destination endpoint only supports the creation of producers.

An RFC server endpoint supports inbound communication from SAP, which enables ABAP applications in SAP to make RFC calls into server endpoints. An ABAP application interacts with an RFC server endpoint as if it were a remote function module. An RFC server endpoint is configured to receive an RFC call to a specific RFC function over a specific connection from an SAP instance. An RFC server is a logical designation for an inbound connection and has a unique name. An RFC server is specified by a set of connection parameters called server data.

An RFC server endpoint will handle an incoming RFC request and dispatch it as the input message of an IN-OUT exchange. The output message of the exchange will be returned as the response of the RFC call. Since SAP RFC server endpoints only support inbound communication, an RFC server endpoint only supports the creation of consumers.

An IDoc destination endpoint supports outbound communication to SAP, which can then perform further processing on the IDoc message. An IDoc document represents a business transaction, which can easily be exchanged with non-SAP systems. An IDoc destination is specified by a set of connection parameters called destination data.

An IDoc list destination endpoint is similar to an IDoc destination endpoint, except that the messages it handles consist of a list of IDoc documents.

An IDoc list server endpoint supports inbound communication from SAP, enabling a Camel route to receive a list of IDoc documents from an SAP system. An IDoc list server is specified by a set of connection parameters called server data.

A meta-data repository is used to store the following kinds of meta-data:

SAP destination and server endpoints thus require access to a repository, in order to send and receive RFC calls and in order to send and receive IDoc documents. For RFC calls, the meta-data for all function modules invoked and handled by the endpoints must reside within the repository; and for IDoc endpoints, the meta-data for all IDoc types and IDoc type extensions handled by the endpoints must reside within the repository. The location of the repository used by a destination and server endpoint is specified in the destination data and the server data of their respective connections.

In the case of an SAP destination endpoint, the repository it uses typically resides in an SAP system and it defaults to the SAP system it is connected to. This default requires no explicit configuration in the destination data. Furthermore, the meta-data for the remote function call that a destination endpoint makes will already exist in a repository for any existing function module that it calls. The meta-data for calls made by destination endpoints thus require no configuration in the SAP component.

On the other hand, the meta-data for function calls handled by server endpoints do not typically reside in the repository of an SAP system and must instead be provided by a repository residing in the SAP component. The SAP component maintains a map of named meta-data repositories. The name of a repository corresponds to the name of the server to which it provides meta-data.

An SAP endpoint expects to receive a message with a message body containing an SAP request object and will return a message with a message body containing an SAP response object. SAP requests and responses are fixed map data structures containing named fields with each field having a predefined data type.

Note that the named fields in an SAP request and response are specific to an SAP endpoint, with each endpoint defining the parameters in the SAP request and response it will accept. An SAP endpoint provides factory methods to create the request and response objects that are specific to it.

public class SAPEndpoint ... {
    ...
    public Structure getRequest() throws Exception;

    public Structure getResponse() throws Exception;
    ...
}

Both SAP request and response objects are represented in Java as a structure object which supports the org.fusesource.camel.component.sap.model.rfc.Structure interface. This interface extends both the java.util.Map and org.eclipse.emf.ecore.EObject interfaces.

public interface Structure extends org.eclipse.emf.ecore.EObject,
                                        java.util.Map<String, Object> {

    <T> T get(Object key, Class<T> type);

}

The field values in a structure object are accessed through the field’s getter methods in the map interface. In addition, the structure interface provides a type-restricted method to retrieve field values.

Structure objects are implemented in the component runtime using the Eclipse Modeling Framework (EMF) and support that framework’s EObject interface. Instances of a structure object have attached meta-data which define and restrict the structure and contents of the map of fields it provides. This meta-data can be accessed and introspected using the standard methods provided by EMF. Please refer to the EMF documentation for further details.

As discussed in the following sections, structure objects can contain fields that contain values of the complex field types, STRUCTURE and TABLE. Note that it is unnecessary to create instances of these types and add them to the structure. Instances of these field values are created on demand if necessary when accessed in the enclosing structure.

The fields that reside within the structure object of an SAP request or response may be either elementary or complex. An elementary field contains a single scalar value, whereas a complex field will contain one or more fields of either a elementary or complex type.

An elementary field may be either a character, numeric, hexadecimal or string field type. The following table summarizes the types of elementary fields that may reside in a structure object:

A character field contains a fixed sized character string that may use either a non-Unicode or Unicode character encoding in the underlying JCo and ABAP runtimes. Non-Unicode character strings encode one character per byte. Unicode characters strings are encoded in two bytes using UTF-16 encoding. Character field values are represented in Java as java.lang.String objects and the underlying JCo runtime is responsible for the conversion to their ABAP representation.

A character field declares its field length in its associated byteLength and unicodeByteLength properties, which determine the length of the field’s character string in each encoding system.

A numeric field contains a number. The following numeric field types are supported:

A hexadecimal field contains raw binary data. The following hexadecimal field types are supported:

A string field references a variable length string value. The length of that string value is not fixed until runtime. The storage for the string value is dynamically created in the underlying JCo and ABAP runtimes. The storage for the string field itself is fixed and contains only a string header.

A complex field may be either a structure or table field type. The following table summarizes these complex field types.

A STRUCTURE field contains a structure object and is stored in the underlying JCo and ABAP runtimes as an ABAP structure record. It corresponds to either an ABAP type u or v. The value of a STRUCTURE field is represented in Java as a structure object with the interface org.fusesource.camel.component.sap.model.rfc.Structure.

A TABLE field contains a table object and is stored in the underlying JCo and ABAP runtimes as an ABAP internal table. It corresponds to the ABAP type h. The value of the field is represented in Java by a table object with the interface org.fusesource.camel.component.sap.model.rfc.Table.

A table object is a homogeneous list data structure containing rows of structure objects with the same structure. This interface extends both the java.util.List and org.eclipse.emf.ecore.EObject interfaces.

public interface Table<S extends Structure>
    extends org.eclipse.emf.ecore.EObject,
    java.util.List<S> {

    /**
     * Creates and adds table row at end of row list
     */
    S add();

    /**
     * Creates and adds table row at index in row list
     */
    S add(int index);

}

The list of rows in a table object are accessed and managed using the standard methods defined in the list interface. In addition the table interface provides two factory methods for creating and adding structure objects to the row list.

Table objects are implemented in the component runtime using the Eclipse Modeling Framework (EMF) and support that framework’s EObject interface. Instances of a table object have attached meta-data which define and restrict the structure and contents of the rows it provides. This meta-data can be accessed and introspected using the standard methods provided by EMF. Please refer to the EMF documentation for further details.

When using one of the IDoc Camel SAP endpoints, the type of the message body depends on which particular endpoint you are using.

For a sap-idoc-destination endpoint or a sap-qidoc-destination endpoint, the message body is of Document type:

org.fusesource.camel.component.sap.model.idoc.Document

For a sap-idoclist-destination endpoint, a sap-qidoclist-destination endpoint, or a sap-idoclist-server endpoint, the message body is of DocumentList type:

org.fusesource.camel.component.sap.model.idoc.DocumentList

For the Camel SAP component, an IDoc document is modelled using the Eclipse Modelling Framework (EMF), which provides a wrapper API around the underlying SAP IDoc API. The most important types in this model are:

org.fusesource.camel.component.sap.model.idoc.Document
org.fusesource.camel.component.sap.model.idoc.Segment

The Document type represents an IDoc document instance. In outline, the Document interface exposes the following methods:

// Java
package org.fusesource.camel.component.sap.model.idoc;
...
public interface Document extends EObject {
    // Access the field values from the IDoc control record
    String getArchiveKey();
    void setArchiveKey(String value);
    String getClient();
    void setClient(String value);
    ...

    // Access the IDoc document contents
    Segment getRootSegment();
}

The following kinds of method are exposed by the Document interface:

The Segment type is used to access the data records of the IDoc document, where the segments are laid out in accordance with the structure defined by the document’s IDoc type. In outline, the Segment interface exposes the following methods:

// Java
package org.fusesource.camel.component.sap.model.idoc;
...
public interface Segment extends EObject, java.util.Map<String, Object> {
    // Returns the value of the '<em><b>Parent</b></em>' reference.
    Segment getParent();

    // Return a immutable list of all child segments
    <S extends Segment> EList<S> getChildren();

    // Returns a list of child segments of the specified segment type.
    <S extends Segment> SegmentList<S> getChildren(String segmentType);

    EList<String> getTypes();

    Document getDocument();

    String getDescription();

    String getType();

    String getDefinition();

    int getHierarchyLevel();

    String getIdocType();

    String getIdocTypeExtension();

    String getSystemRelease();

    String getApplicationRelease();

    int getNumFields();

    long getMaxOccurrence();

    long getMinOccurrence();

    boolean isMandatory();

    boolean isQualified();

    int getRecordLength();

    <T> T get(Object key, Class<T> type);
}

The getChildren(String segmentType) method is particularly useful for adding new (nested) children to a segment. It returns an object of type, SegmentList, which is defined as follows:

// Java
package org.fusesource.camel.component.sap.model.idoc;
...
public interface SegmentList<S extends Segment> extends EObject, EList<S> {
    S add();

    S add(int index);
}

Hence, to create a data record of E1SCU_CRE type, you could use Java code like the following:

Segment rootSegment = document.getRootSegment();

Segment E1SCU_CRE_Segment = rootSegment.getChildren("E1SCU_CRE").add();

According to the SAP documentation, an IDoc document consists of the following main parts:

For example, Example 287.1, “Creating an IDoc Document in Java” shows how to create an IDoc document with the IDoc type, FLCUSTOMER_CREATEFROMDATA01, using the IDoc model API in Java.

// Java
import org.fusesource.camel.component.sap.model.idoc.Document;
import org.fusesource.camel.component.sap.model.idoc.Segment;
import org.fusesource.camel.component.sap.util.IDocUtil;

import org.fusesource.camel.component.sap.model.idoc.Document;
import org.fusesource.camel.component.sap.model.idoc.DocumentList;
import org.fusesource.camel.component.sap.model.idoc.IdocFactory;
import org.fusesource.camel.component.sap.model.idoc.IdocPackage;
import org.fusesource.camel.component.sap.model.idoc.Segment;
import org.fusesource.camel.component.sap.model.idoc.SegmentChildren;
...
//
// Create a new IDoc instance using the modelling classes
//

// Get the SAP Endpoint bean from the Camel context.
// In this example, it's a 'sap-idoc-destination' endpoint.
SapTransactionalIDocDestinationEndpoint endpoint =
    exchange.getContext().getEndpoint(
        "bean:SapEndpointBeanID",
        SapTransactionalIDocDestinationEndpoint.class
    );

// The endpoint automatically populates some required control record attributes
Document document = endpoint.createDocument()

// Initialize additional control record attributes
document.setMessageType("FLCUSTOMER_CREATEFROMDATA");
document.setRecipientPartnerNumber("QUICKCLNT");
document.setRecipientPartnerType("LS");
document.setSenderPartnerNumber("QUICKSTART");
document.setSenderPartnerType("LS");

Segment rootSegment = document.getRootSegment();

Segment E1SCU_CRE_Segment = rootSegment.getChildren("E1SCU_CRE").add();

Segment E1BPSCUNEW_Segment = E1SCU_CRE_Segment.getChildren("E1BPSCUNEW").add();
E1BPSCUNEW_Segment.put("CUSTNAME", "Fred Flintstone");
E1BPSCUNEW_Segment.put("FORM", "Mr.");
E1BPSCUNEW_Segment.put("STREET", "123 Rubble Lane");
E1BPSCUNEW_Segment.put("POSTCODE", "01234");
E1BPSCUNEW_Segment.put("CITY", "Bedrock");
E1BPSCUNEW_Segment.put("COUNTR", "US");
E1BPSCUNEW_Segment.put("PHONE", "800-555-1212");
E1BPSCUNEW_Segment.put("EMAIL", "fred@bedrock.com");
E1BPSCUNEW_Segment.put("CUSTTYPE", "P");
E1BPSCUNEW_Segment.put("DISCOUNT", "005");
E1BPSCUNEW_Segment.put("LANGU", "E");

Table 287.2, “IDoc Document Attributes” shows the control record attributes that you can set on the Document object.

When setting the control record attributes in Java (from Table 287.2, “IDoc Document Attributes”), the usual convention for Java bean properties is followed. That is, a name attribute can be accessed through the getName and setName methods, for getting and setting the attribute value. For example, the iDocType, iDocTypeExtension, and messageType attributes can be set as follows on a Document object:

// Java
document.setIDocType("FLCUSTOMER_CREATEFROMDATA01");
document.setIDocTypeExtension("");
document.setMessageType("FLCUSTOMER_CREATEFROMDATA");

When setting the control record attributes in XML, the attributes must be set on the idoc:Document element. For example, the iDocType, iDocTypeExtension, and messageType attributes can be set as follows:

<?xml version="1.0" encoding="ASCII"?>
<idoc:Document ...
               iDocType="FLCUSTOMER_CREATEFROMDATA01"
               iDocTypeExtension=""
               messageType="FLCUSTOMER_CREATEFROMDATA" ... >
    ...
</idoc:Document>

The SAP Component supports the BAPI transaction model for outbound communication with SAP. A destination endpoint with a URL containing the transacted option set to true will, if necessary, initiate a stateful session on the outbound connection of the endpoint and register a Camel Synchronization object with the exchange. This synchronization object will call the BAPI service method BAPI_TRANSACTION_COMMIT and end the stateful session when the processing of the message exchange is complete. If the processing of the message exchange fails, the synchronization object will call the BAPI server method BAPI_TRANSACTION_ROLLBACK and end the stateful session.

The tRFC protocol accomplishes an AT-MOST-ONCE delivery and processing guarantee by identifying each transactional request with a unique transaction identifier (TID). A TID accompanies each request sent in the protocol. A sending application using the tRFC protocol must identify each instance of a request with a unique TID when sending the request. An application may send a request with a given TID multiple times, but the protocol ensures that the request is delivered and processed in the receiving system at most once. An application may choose to resend a request with a given TID when encountering a communication or system error when sending the request, and is thus in doubt as to whether that request was delivered and processed in the receiving system. By resending a request when encountering an communication error, a client application using the tRFC protocol can thus ensure EXACTLY-ONCE delivery and processing guarantees for its request.

A BAPI transaction is an application level transaction, in the sense that it imposes ACID guarantees on the persistent data changes performed by a BAPI method or RFC function in the SAP database. An RFC transaction is a communication transaction, in the sense that it imposes delivery guarantees (AT-MOST-ONCE, EXACTLY-ONCE, EXACTLY-ONCE-IN-ORDER) on requests to a BAPI method and/or RFC function.

The following destination endpoints support RFC transactions:

A single Camel route can include multiple transactional RFC destination endpoints, sending messages to multiple RFC destinations and even sending messages to the same RFC destination multiple times. This implies that the Camel SAP component potentially needs to keep track of many transaction IDs (TIDs) for each Exchange object passing along a route. Now if the route processing fails and must be retried, the situation gets quite complicated. The RFC transaction semantics demand that each RFC destination along the route must be invoked using the same TID that was used the first time around (and where the TIDs for each of the destinations are distinct from each other). In other words, the Camel SAP component must keep track of which TID was used at which point along the route, and remember this information, so that the TIDs can be replayed in the correct order.

By default, Camel does not provide a mechanism that enables an Exchange to know where it is in a route. To provide such a mechanism, it is necessary to install the CurrentProcessorDefinitionInterceptStrategy interceptor into the Camel runtime. This interceptor must be installed into the Camel runtime, in order for the Camel SAP component to keep track of the TIDs in a route. For details of how to configure the interceptor, see the section called “Interceptor for tRFC and qRFC destinations”.

The following server endpoints support RFC transactions:

When a Camel exchange processing a transactional request encounters a processing error, Camel handles the processing error through its standard error handling mechanisms. If the Camel route processing the exchange is configured to propagate the error back to the caller, the SAP server endpoint that initiated the exchange takes note of the failure and the sending SAP system is notified of the error. The sending SAP system can then respond by sending another transaction request with the same TID to process the request again.

SAP request and response objects support an XML serialization format which enable these objects to be serialized to and from an XML document.

Each RFC in a repository defines a specific XML name space for the elements which compose the serialized forms of its Request and Response objects. The form of this namespace URL is as follows:

http://sap.fusesource.org/rfc/<Repository Name>/<RFC Name>

RFC namespace URLs have a common http://sap.fusesource.org/rfc prefix followed by the name of the repository in which the RFC’s metadata is defined. The final component in the URL is the name of the RFC itself.

An SAP request object will be serialized into an XML document with the root element of that document named Request and scoped by the namespace of the request’s RFC.

<?xml version="1.0" encoding="ASCII"?>
<BOOK_FLIGHT:Request
     xmlns:BOOK_FLIGHT="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT">
    ...
</BOOK_FLIGHT:Request>

An SAP response object will be serialized into an XML document with the root element of that document named Response and scoped by the namespace of the response’s RFC.

<?xml version="1.0" encoding="ASCII"?>
<BOOK_FLIGHT:Response
     xmlns:BOOK_FLIGHT="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT">
    ...
</BOOK_FLIGHT:Response>

Structure fields in parameter lists or nested structures are serialized as elements. The element name of the serialized structure corresponds to the field name of the structure within the enclosing parameter list, structure or table row entry it resides.

<BOOK_FLIGHT:FLTINFO
     xmlns:BOOK_FLIGHT="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT">
    ...
</BOOK_FLIGHT:FLTINFO>

Note that the type name of the structure element in the RFC namespace will correspond to the name of the record meta data object which defines the structure, as in the following example:

<xs:schema
     targetNamespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT">
     xmlns:xs="http://www.w3.org/2001/XMLSchema">
    ...
    <xs:complexType name="FLTINFO_STRUCTURE”>
    ...
    </xs:complexType>
    ...
</xs:schema>

This distinction will be important when specifying a JAXB bean to marshal and unmarshal the structure as will be seen in Section 287.12, “Example 3: Handling Requests from SAP”.

Table fields in parameter lists or nested structures are serialized as elements. The element name of the serialized structure will correspond to the field name of the table within the enclosing parameter list, structure, or table row entry it resides. The table element will contain a series of row elements to hold the serialized values of the table’s row entries.

<BOOK_FLIGHT:CONNINFO
     xmlns:BOOK_FLIGHT="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT">
    <row ... > ... </row>
    ...
    <row ... > ... </row>
</BOOK_FLIGHT:CONNINFO>

Note that the type name of the table element in the RFC namespace will correspond to the name of the record meta data object which defines the row structure of the table suffixed by _TABLE. The type name of the table row element in the RFC name corresponds to the name of the record meta data object which defines the row structure of the table, as in the following example:

<xs:schema
     targetNamespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT"
     xmlns:xs="http://www.w3.org/2001/XMLSchema">
    ...
    <xs:complextType name="CONNECTION_INFO_STRUCTURE_TABLE”>
        <xs:sequence>
            <xs:element
                name="row”
                minOccures="0”
                maxOccurs="unbounded”
                type="CONNECTION_INFO_STRUCTURE”/>
            ...
            <xs:sequence>
        </xs:sequence>
    </xs:complexType>

    <xs:complextType name="CONNECTION_INFO_STRUCTURE”>
            ...
    </xs:complexType>
    ...
</xs:schema>

This distinction will be important when specifying a JAXB bean to marshal and unmarshal the structure as will be seen in Section 287.12, “Example 3: Handling Requests from SAP”.

Elementary fields in parameter lists or nested structures are serialized as attributes on the element of the enclosing parameter list or structure. The attribute name of the serialized field corresponds to the field name of the field within the enclosing parameter list, structure, or table row entry it resides, as in the following example:

<?xml version="1.0" encoding="ASCII"?>
<BOOK_FLIGHT:Request
     xmlns:BOOK_FLIGHT="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT"
     CUSTNAME="James Legrand"
    PASSFORM="Mr"
    PASSNAME="Travelin Joe"
    PASSBIRTH="1990-03-17T00:00:00.000-0500"
    FLIGHTDATE="2014-03-19T00:00:00.000-0400"
    TRAVELAGENCYNUMBER="00000110"
    DESTINATION_FROM="SFO"
    DESTINATION_TO="FRA"/>

Date and Time fields are serialized into attribute values using the following format:

yyyy-MM-dd'T'HH:mm:ss.SSSZ

Date fields will be serialized with only the year, month, day and timezone components set:

DEPDATE="2014-03-19T00:00:00.000-0400"

Time fields will be serialized with only the hour, minute, second, millisecond and timezone components set:

DEPTIME="1970-01-01T16:00:00.000-0500"

An IDoc message body can be serialized into an XML string format, with the help of a built-in type converter.

Each serialized IDoc is associated with an XML namespace, which has the following general format:

http://sap.fusesource.org/idoc/repositoryName/idocType/idocTypeExtension/systemRelease/applicationRelease

Both the repositoryName (name of the remote SAP meta-data repository) and the idocType (IDoc document type) are mandatory, but the other components of the namespace can be left blank. For example, you could have an XML namespace like the following:

http://sap.fusesource.org/idoc/MY_REPO/FLCUSTOMER_CREATEFROMDATA01///

The Camel SAP component has a built-in type converter, which is capable of converting a Document object or a DocumentList object to and from a String type.

For example, to serialize a Document object to an XML string, you can simply add the following line to a route in XML DSL:

<convertBodyTo type="java.lang.String"/>

You can also use this approach to a serialized XML message into a Document object. For example, given that the current message body is a serialized XML string, you can convert it back into a Document object by adding the following line to a route in XML DSL:

<convertBodyTo type="org.fusesource.camel.component.sap.model.idoc.Document"/>

When you convert an IDoc message to a String, it is serialized into an XML document, where the root element is either idoc:Document (for a single document) or idoc:DocumentList (for a list of documents). Example 287.2, “IDoc Message Body in XML” shows a single IDoc document that has been serialized to an idoc:Document element.

<?xml version="1.0" encoding="ASCII"?>
<idoc:Document
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:FLCUSTOMER_CREATEFROMDATA01---="http://sap.fusesource.org/idoc/XXX/FLCUSTOMER_CREATEFROMDATA01///"
    xmlns:idoc="http://sap.fusesource.org/idoc"
    creationDate="2015-01-28T12:39:13.980-0500"
    creationTime="2015-01-28T12:39:13.980-0500"
    iDocType="FLCUSTOMER_CREATEFROMDATA01"
    iDocTypeExtension=""
    messageType="FLCUSTOMER_CREATEFROMDATA"
    recipientPartnerNumber="QUICKCLNT"
    recipientPartnerType="LS"
    senderPartnerNumber="QUICKSTART"
    senderPartnerType="LS">
  <rootSegment xsi:type="FLCUSTOMER_CREATEFROMDATA01---:ROOT" document="/">
    <segmentChildren parent="//@rootSegment">
      <E1SCU_CRE parent="//@rootSegment" document="/">
        <segmentChildren parent="//@rootSegment/@segmentChildren/@E1SCU_CRE.0">
          <E1BPSCUNEW parent="//@rootSegment/@segmentChildren/@E1SCU_CRE.0"
              document="/"
              CUSTNAME="Fred Flintstone" FORM="Mr."
              STREET="123 Rubble Lane"
              POSTCODE="01234"
              CITY="Bedrock"
              COUNTR="US"
              PHONE="800-555-1212"
              EMAIL="fred@bedrock.com"
              CUSTTYPE="P"
              DISCOUNT="005"
              LANGU="E"/>
        </segmentChildren>
      </E1SCU_CRE>
    </segmentChildren>
  </rootSegment>
</idoc:Document>

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.

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");

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>

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.
    SapSynchronousRfcDestinationEndpoint endpoint =
        exchange.getContext().getEndpoint("sap-srfc-destination:nplDest:BAPI_FLCUST_GETLIST",
                                                 SapSynchronousRfcDestinationEndpoint.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);
}

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);

}

This example demonstrates a route which creates a FlightTrip business object instance in SAP. The route invokes the FlightTrip BAPI method, BAPI_FLTRIP_CREATE, using a destination endpoint to create the object.

The Java DSL for the example route is as follows:

from("direct:createFlightTrip")
    .to("bean:createFlightTripRequest")
    .to("sap-srfc-destination:nplDest:BAPI_FLTRIP_CREATE?transacted=true")
    .to("bean:returnFlightTripResponse");

And the Spring DSL for the same route is as follows:

<route>
    <from uri="direct:createFlightTrip"/>
    <to uri="bean:createFlightTripRequest"/>
    <to uri="sap-srfc-destination:nplDest:BAPI_FLTRIP_CREATE?transacted=true"/>
    <to uri="bean:returnFlightTripResponse"/>
</route>

Note that the URL for the SAP endpoint has the transacted option set to true. As discussed in Section 287.7, “Transaction Support”, when this option is enabled the endpoint ensures that an SAP transaction session has been initiated before invoking the RFC call. Because this endpoint’s RFC creates new data in SAP, this options is necessary to make the route’s changes permanent in SAP.

The createFlightTripRequest and returnFlightTripResponse beans are responsible for populating request parameters into the SAP request and extracting response parameters from the SAP response respectively following the same sequence of operations as demonstrated in the previous example.

This example demonstrates a route which handles a request from SAP to the BOOK_FLIGHT RFC, which is implemented by the route. In addition, it demonstrates the component’s XML serialization support, using JAXB to unmarshal and marshal SAP request objects and response objects to custom beans.

This route creates a FlightTrip business object on behalf of a travel agent, FlightCustomer. The route first unmarshals the SAP request object received by the SAP server endpoint into a custom JAXB bean. This custom bean is then multicasted in the exchange to three sub-routes, which gather the travel agent, flight connection and passenger information required to create the flight trip. The final sub-route creates the flight trip object in SAP as demonstrated in the previous example. The final sub-route also creates and returns a custom JAXB bean which is marshaled into an SAP response object and returned by the server endpoint.

The Java DSL for the example route is as follows:

DataFormat jaxb = new JaxbDataFormat("org.fusesource.sap.example.jaxb");

from("sap-srfc-server:nplserver:BOOK_FLIGHT")
    .unmarshal(jaxb)
    .multicast()
    .to("direct:getFlightConnectionInfo",
        "direct:getFlightCustomerInfo",
        "direct:getPassengerInfo")
    .end()
    .to("direct:createFlightTrip")
    .marshal(jaxb);

And the XML DSL for the same route is as follows:

<route>
    <from uri="sap-srfc-server:nplserver:BOOK_FLIGHT"/>
    <unmarshal>
        <jaxb contextPath="org.fusesource.sap.example.jaxb"/>
    </unmarshal>
    <multicast>
        <to uri="direct:getFlightConnectionInfo"/>
        <to uri="direct:getFlightCustomerInfo"/>
        <to uri="direct:getPassengerInfo"/>
    </multicast>
    <to uri="direct:createFlightTrip"/>
    <marshal>
        <jaxb contextPath="org.fusesource.sap.example.jaxb"/>
    </marshal>
</route>

The following listing illustrates a JAXB bean which unmarshals from the serialized form of an SAP BOOK_FLIGHT request object:

@XmlRootElement(name="Request", namespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT")
@XmlAccessorType(XmlAccessType.FIELD)
public class BookFlightRequest {

    @XmlAttribute(name="CUSTNAME")
    private String customerName;

    @XmlAttribute(name="FLIGHTDATE")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date flightDate;

    @XmlAttribute(name="TRAVELAGENCYNUMBER")
    private String travelAgencyNumber;

    @XmlAttribute(name="DESTINATION_FROM")
    private String startAirportCode;

    @XmlAttribute(name="DESTINATION_TO")
    private String endAirportCode;

    @XmlAttribute(name="PASSFORM")
    private String passengerFormOfAddress;

    @XmlAttribute(name="PASSNAME")
    private String passengerName;

    @XmlAttribute(name="PASSBIRTH")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date passengerDateOfBirth;

    @XmlAttribute(name="CLASS")
    private String flightClass;

    ...
}

The following listing illustrates a JAXB bean which marshals to the serialized form of an SAP BOOK_FLIGHT response object:

@XmlRootElement(name="Response", namespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT")
@XmlAccessorType(XmlAccessType.FIELD)
public class BookFlightResponse {

    @XmlAttribute(name="TRIPNUMBER")
    private String tripNumber;

    @XmlAttribute(name="TICKET_PRICE")
    private BigDecimal ticketPrice;

    @XmlAttribute(name="TICKET_TAX")
    private BigDecimal ticketTax;

    @XmlAttribute(name="CURRENCY")
    private String currency;

    @XmlAttribute(name="PASSFORM")
    private String passengerFormOfAddress;

    @XmlAttribute(name="PASSNAME")
    private String passengerName;

    @XmlAttribute(name="PASSBIRTH")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date passengerDateOfBirth;

    @XmlElement(name="FLTINFO")
    private FlightInfo flightInfo;

    @XmlElement(name="CONNINFO")
    private ConnectionInfoTable connectionInfo;

    ...
}

The following listing illustrates a JAXB bean which marshals to the serialized form of the complex structure parameter FLTINFO:

@XmlRootElement(name="FLTINFO", namespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT")
@XmlAccessorType(XmlAccessType.FIELD)
public class FlightInfo {

    @XmlAttribute(name="FLIGHTTIME")
    private String flightTime;

    @XmlAttribute(name="CITYFROM")
    private String cityFrom;

    @XmlAttribute(name="DEPDATE")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date departureDate;

    @XmlAttribute(name="DEPTIME")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date departureTime;

    @XmlAttribute(name="CITYTO")
    private String cityTo;

    @XmlAttribute(name="ARRDATE")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date arrivalDate;

    @XmlAttribute(name="ARRTIME")
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date arrivalTime;

    ...
}

The following listing illustrates a JAXB bean which marshals to the serialized form of the complex table parameter, CONNINFO. Note that the name of the root element type of the JAXB bean corresponds to the name of the row structure type suffixed with _TABLE and the bean contains a list of row elements.

@XmlRootElement(name="CONNINFO_TABLE", namespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT")
@XmlAccessorType(XmlAccessType.FIELD)
public class ConnectionInfoTable {

    @XmlElement(name="row")
    List<ConnectionInfo> rows;

    ...
}

The following listing illustrates a JAXB bean, which marshals to the serialized form of the above tables row elements:

@XmlRootElement(name="CONNINFO", namespace="http://sap.fusesource.org/rfc/nplServer/BOOK_FLIGHT")
@XmlAccessorType(XmlAccessType.FIELD)
public class ConnectionInfo {

    @XmlAttribute(name="CONNID")
    String connectionId;

    @XmlAttribute(name="AIRLINE")
    String airline;

    @XmlAttribute(name="PLANETYPE")
    String planeType;

    @XmlAttribute(name="CITYFROM")
    String cityFrom;

    @XmlAttribute(name="DEPDATE")
    @XmlJavaTypeAdapter(DateAdapter.class)
    Date departureDate;

    @XmlAttribute(name="DEPTIME")
    @XmlJavaTypeAdapter(DateAdapter.class)
    Date departureTime;

    @XmlAttribute(name="CITYTO")
    String cityTo;

    @XmlAttribute(name="ARRDATE")
    @XmlJavaTypeAdapter(DateAdapter.class)
    Date arrivalDate;

    @XmlAttribute(name="ARRTIME")
    @XmlJavaTypeAdapter(DateAdapter.class)
    Date arrivalTime;

    ...
}