Control Flow

The RFC adapter loads its configuration from a file (for example, adapter_config.xml) and validates it against the adapter schema (framework.xsd). The framework.xsd file is used by the adapter toolkit, which the adapter is based on, to check for things like missing elements, invalid value types, and so on.

Sample adapter configuration files are located in the various example adapter folders:

Windows: %ESP_HOME%\adapters\rfc\examples
UNIX: $ESP_HOME/adapters/rfc/examples

The framework.xsd file is located in the %ESP_HOME%\adapters\framework\config directory on Windows and $ESP_HOME/adapters/framework/config on UNIX.

The Adapter Controller creates an instance of the RFC adapter, and receives and executes start and stop commands.

SAP RFC Input Adapter Control Flow

SAP RFC Output Adapter Control Flow

Start Command
When the start command is executed, it configures and starts the command and control interface, starts the input or output adapter, establishes a connection to an SAP system, and connects the ESPPublisher (for the input adapter) or ESPSubscriber (for the output adapter) components to Event Stream Processor via the SDK interface.
Stop Command
When the stop command is executed, it disconnects the ESPPublisher (for the input adapter) or ESPSubscriber (for the output adapter) components from Event Stream Processor, waits until all the buffered rows between the modules are processed, disconnects the input or output adapter from the SAP system, and terminates the adapter process. You can also execute the immediatestop command which is the same as the stop command except that it discards the buffered rows and stops adapter immediately.

Parent topic: SAP RFC Input and Output Adapter