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ALE is used to integrate business processes between different SAP and non-SAP back-end systems. It allows controlled data exchange between and SAP and non-SAP applications. IDocs are used by ALE to pass data in and out of the SAP applications. IDocs contain information in a predefined format (structured ASCII) and may be understood as the serialized form of business data objects. Asynchronous communication is used by ALE.
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RFCs are SAP-specific remote procedure calls that are used to communicate among distributed SAP modules. ABAP function modules can be declared as remote enabled and made accessible to an RFC client remotely. The SAP system can act as an RFC server or as an RFC client. RFCs represent a synchronous communication style. WebSphere Adapter for SAP Software WebSphere Adapter for SAP Software provides a comprehensive way to interact with SAP software by allowing multiple ways to work with applications and data on the SAP server. This adapter supports both outbound processing (from application to adapter to SAP server) and inbound processing (from SAP server to adapter to the application). In the case of outbound processing, all CRUD (create, retrieve, update, delete) operations on the data on the SAP server are supported. In the case of inbound processing, an event that occurs on the SAP server is sent to the adapter. The ALE Inbound and Synchronous Callback interfaces start event listeners that detect the events. Conversely, the Advanced Event Processing interface polls the SAP server for events. The adapter then delivers the event to an end point, which is an application or other consumer of the event from the SAP server. Figure 10.9 shows an overview of the outbound processing interfaces. Here is a summary description of these interfaces:
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BAPI interfaces Through its BAPI interfaces, the adapter issues remote function calls (RFCs) to RFC-enabled functions, such as a Business Application Programming Interface (BAPI) function. These remote function calls create, update, or retrieve data on an SAP server and return the results to the calling application. BAPI calls are useful when you need to perform data retrieval or manipulation and a BAPI or RFC function that performs the task already exists.
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Query Interface
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Outbound SAP interactions via the use of the WebSphere SAP adapter
Query interface The Query interface for SAP Software retrieves data from speci c SAP application tables. It can return the data or check for the existence of the data. You can use this type of interaction with SAP if you need to retrieve data from an SAP table without using an RFC function or a BAPI. ALE In the case of Application Link Enabling (ALE), SAP s Intermediate Data Structures (IDocs) are used for the exchange of data. For outbound processing, you send an IDoc or a packet of IDocs to the SAP server. The ALE interface, which is particularly useful for batch processing of IDocs, provides asynchronous exchange. You can use the queued transactional (qRFC) protocol to send the IDocs to a queue on the SAP server. The qRFC protocol ensures the order in which the IDocs are received. It is often used for system replications or system-to-system transfers.
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Advanced Event Processing interface Lastly, in the case of Advanced event processing interface, you send data to the SAP server. The ABAP handler on the SAP server then processes the data.
Similarly, Figure 10.10 shows an overview of inbound processing interfaces. WebSphere Adapter for SAP provides the following three interfaces for inbound processing:
Synchronous Callback interface The adapter listens for events and receives noti cations of RFC-enabled function calls from the SAP server through the use of this interface. The adapter then sends the request to a prede ned application and returns the response to the SAP server. ALE Inbound Processing interface In this case, the adapter listens for events and receives IDocs from the SAP server. The communication is asynchronous. In addition, the IDocs can be received through a queue on the SAP server, which ensures that the IDocs are received in the proper order. The adapter uses a data source to persist
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