How to call RFC function of ABAP on premises system directly in SAP BTP ABAP programming environment

Log in first ABAP On-Premises System , Run transaction code ：aco_proxy, by RFC function RFC_SYSTEM_INFO and RFC_READ_TABLE, Generate proxy class metadata , The format is xml. take xml Save file locally .

Use ABAP Development Tool Sign in SAP BTP ABAP Running environment , Create a new one Service Consumption Model, Type selection RFC：

Generate a Proxy Class, We'll be back in ABAP In the code , Through this Proxy Class To call On-Premises On the system RFC function . Put the previous step in On-Premises Generated in the system metadata.xml, Import to Proxy In the class Generation Wizard .

Activate this Service Consumption Model, In the automatically generated proxy class , We can find ABAP The code template , This code template , It can be copied directly to our ABAP In the code , Minor modifications , Can call ABAP On-Premises Systematic RFC Function .

Create a new one ABAP class , Copy the code in the above proxy class to this ABAP Class Main In the method ：

The complete code is as follows ：

CLASS zcl_consume_rfc DEFINITION  PUBLIC  FINAL  CREATE PUBLIC .PUBLIC SECTION.  INTERFACES if_oo_adt_classrun .PROTECTED SECTION.PRIVATE SECTION.ENDCLASS.CLASS zcl_consume_rfc IMPLEMENTATION.  METHOD if_oo_adt_classrun~main.    DATA dest TYPE REF TO IF_RFC_DEST.    DATA myobj  TYPE REF TO ZCL_JERRY_RFC_PROXY.    DATA CURRENT_RESOURCES TYPE ZCL_JERRY_RFC_PROXY=>SYST_INDEX.    DATA FAST_SER_VERS TYPE INT4.    DATA MAXIMAL_RESOURCES TYPE ZCL_JERRY_RFC_PROXY=>SYST_INDEX.    DATA RECOMMENDED_DELAY TYPE ZCL_JERRY_RFC_PROXY=>SYST_INDEX.    DATA RFCSI_EXPORT TYPE ZCL_JERRY_RFC_PROXY=>RFCSI.    DATA S4_HANA TYPE ZCL_JERRY_RFC_PROXY=>CHAR1.    TRY.      dest = CL_RFC_DESTINATION_PROVIDER=>create_by_cloud_destination( 'AG3' ).      CREATE OBJECT myobj        EXPORTING          destination = dest.    catch CX_RFC_DEST_PROVIDER_ERROR.     " handle CX_RFC_DEST_PROVIDER_ERROR    ENDTRY.    TRY.      myobj->RFC_SYSTEM_INFO(         IMPORTING           CURRENT_RESOURCES = CURRENT_RESOURCES           FAST_SER_VERS = FAST_SER_VERS           MAXIMAL_RESOURCES = MAXIMAL_RESOURCES           RECOMMENDED_DELAY = RECOMMENDED_DELAY           RFCSI_EXPORT = RFCSI_EXPORT           S4_HANA = S4_HANA       ).     CATCH  CX_ACO_COMMUNICATION_FAILURE INTO DATA(lcx_comm).      " handle CX_ACO_COMMUNICATION_FAILURE (sy-msg* in lcx_comm->IF_T100_MESSAGE~T100KEY)     CATCH CX_ACO_SYSTEM_FAILURE INTO DATA(lcx_sys).      " handle CX_ACO_SYSTEM_FAILURE (sy-msg* in lcx_sys->IF_T100_MESSAGE~T100KEY)     CATCH CX_ACO_APPLICATION_EXCEPTION INTO DATA(lcx_appl).      " handle APPLICATION_EXCEPTIONS (sy-msg* in lcx_appl->IF_T100_MESSAGE~T100KEY)    ENDTRY.  ENDMETHOD.ENDCLASS.

Be careful , According to this article article The steps mentioned , With the help of SAP Cloud Connector , stay SAP BTP Cockpit On , Complete pointing ABAP On-Premises System AG3 Of Destination To configure .

as a result of , stay SAP BTP、ABAP There are two problems when setting up the connection between environment and on premises ：

• ABAP Environmental Science “ There is ” On Internet in , But the customer's internal deployment system is behind the firewall
• RFC I won't support it Internet

therefore , You need to build from on premises systems to SAP BTP、ABAP Secure tunnel connection for the environment .

• ABAP Environmental tenants from Destination Get the destination in the service instance .
• ABAP Environmental tenants pass Connectivity Service request to open tunnel connection .
• The connection service tells the cloud connector to use the management connection to open a connection with this particular server ABAP Connection of environmental tenants .
• The cloud connector uses its public tenant URL Open to ABAP Tunnel connection of environmental tenants .
• After the tunnel was built , Available for use RFC or HTTP(S) Protocol for actual data connection .