How many types of RFC's?

how many types of rfc's wat r they?

hi
A remote function call is a call to a function module running in a system different from the caller's. The remote function can also be called from within the same system (as a remote call).
RFC consists of two interfaces : A calling interface for ABAP Programs and a calling interface for Non-SAP programs.
Any ABAP program can call a remote function using the CALL FUNCTION...DESTINATION statement. The DESTINATION parameter tells the SAP System that the called function runs in a system other than the caller's.
RFC CLIENT and RFC SERVER
     RFC client is the instance that calls up the Remote Function Call to execute the function that is provided by an RFC server.
     The RFC Interface takes care of :-
  -  Converting all parameter data to the representation needed in the remote system
Calling the communication routines needed to talk to the remote system.
Handling communications errors, and notifying the caller, if desired ( using EXCEPTIONS paramater of  the CALL FUNCTION).
You can use the CALL FUNCTION statement to call remote functions by including an additional DESTINATION clause.
CALL FUNCTION ‘remotefunction’
          DESTINATION dest   
               EXPORTING f1 =
             IMPORTING  f2 =
           TABLES t1 =
           EXCEPTIONS
The field ‘dest’ can be either a literal or a variable. Logical destinations are defined in the RFCDES table via transaction SM59 or via the menu path: Tools ->Administration,Administration->Network->RFC destinations.
Calling remote functions locally :-
( i.e. call a remote function within the same system )
The two options to do this are –
CALL FUNCTION...DESTINATION = 'NONE'
CALL FUNCTION... [no DESTINATION used]
Calling remote function modules BACK :-
    The remote function can invoke its own caller (if the caller is itself a function module), or any function module loaded with the caller.
    You can trigger this call-back mechanism   using
    CALL FUNCTION... DESTINATION 'BACK‘.
Synchronous RFC – The calling program continues the execution only after the called function is complete.
Asynchronous RFC - The calling program continues the execution without waiting for return from the called function.
       Eg: CALL FUNCTION ‘remotefunction’ STARTING NEW TASK ‘taskname’.
Transactional RFC - The called function module is executed exactly once in the RFC server system.Each function call is seen as a transaction in the target system. Transactional RFCs use the suffix IN BACKGROUND TASK .
       Eg : CALL FUNCTION ‘remotefunction’ IN BACKGROUND TASK
regards
vijay
reward points if helpfull

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  • How many types of rfc there

    hi guru
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    thanks
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    Hi Subhasis  ,
      There are 5 types of RFC.
    Here is a link to a very good documnet on RFC
    <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f078394a-4469-2910-c4bf-853c75674694">RFC Document</a>
    Regards
    Arun

  • How many types of rfcs are there

    Hello,
    Can any body explain about how many type of rfcs are there. give the difference also.
    Thanks.

    Hi,
    Check this info.
    These are the types of RFC
    Asynchronous RFC (aRFC)
    Synchronous RFC (sRFC)
    Transactional RFC (tRFC)
    Queued RFC (qRFC)
    Parallel RFC (pRFC)
    Asynchronous RFC :
    This is used when you need to increase the performance of ABAP program by having system call more than one function module in parallel than forcing the program to wait for results .
    Transactional RFC
    This let you group one or more function module call together o tRFC LUW and ensure that fucnction module within LUW is called once . In contrast to aRFC and sRFC the tRFC belonging to tRFC LUW are executed in order .
    tRFC is always used if a function is executed as a Logical Unit of Work (LUW). Within a LUW, all calls are
    1.Executed in the order in which they are called
    2.Executed in the same program context in the target system
    3.Run as a single transaction: they are either committed or rolled back as a unit.
    Implementation of tRFC is recommended if you want to guarantee that the transactional order of the calls is preserved
    Asynchronous remote function calls (aRFCs) are similar to transactional RFCs, in that the user does not have to wait for their completion before continuing the calling dialog. There are three characteristics, however, that distinguish asynchronous RFCs from transactional RFCs:
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    The parameters of asynchronous RFCs are not logged to the database, but sent directly to the server.
    • Asynchronous RFCs allow the user to carry on an interactive dialog with the remote system.
    • The calling program can receive results from the asynchronous RFC.
    You can use asynchronous remote function calls whenever you need to establish communication with a remote system, but do not want to wait for the function’s result before continuing processing. Asynchronous RFCs can also be sent to the same system. In this case, the system opens a new session (or window). You can then switch back and for between the calling dialog and the called session
    RECEIVE RESULTS FROM FUNCTION Remotefunction is used within a FORM routine to receive the results of an asynchronous remote function call. The following receiving parameters are available:
    IMPORTING
    TABLES
    EXCEPTIONS
    The addition KEEPING TASK prevents an asynchronous connection from being closed after receiving the results of the processing. The relevant remote context (roll area) is kept for re-use until the caller terminates the connection.
    Transactional RFC (tRFC) and Queued RFC (qRFC).
    tRFC is used mainly to transfer ALE Intermediate Documents (IDocs).
    Transactional RFC:
    If an error occurs during a synchronous remote function call, the system cannot tell at what point the error occurred (most crucially, whether the function module was actually processed in R/3 before the operation failed). Restarting a failed call is therefore a dangerous thing to do, since you risk duplicating a completed function call.
    To alleviate this problem, you can use transactional RFC, which guarantees that each function call you issue will only be executed once, even if you submit it repeatedly to the R/3 System. The system implements this safeguard by assigning a unique transaction ID (TID) to each transaction that you submit. When you attempt to process the transaction, the system checks whether that TID has already been processed. If it has, the transaction is ignored.
    Disadvantages of tRFC
    - tRFC processes all LUWs independent of one another. Due to the amount of activated tRFC processes, this procedure can reduce performance significantly in both the send and the target systems.
    - In addition, the sequence of LUWs defined in the application cannot be kept. Therefore, there is no guarantee that the transactions are executed in the sequence dictated by the application. The only guarantee is that all LUWs are transferred sooner or later.
    Queued RFC:
    When you use transactional RFC, you cannot guarantee the order in which the function calls will be processed in the system (it is quite possible that one call might overtake another). For cases where you need to specify a particular processing order, you can use queued RFC, which is an extension of transactional RFC. In qRFC, you place each function call in a logical queue. A function call cannot be executed until all of its predecessors in the queue have been processed. Queued RFC calls are processed asynchronously
    Therefore, Queued RFC is better than Transactional RFC.
    Remote Function Call:
    RFC is an SAP interface protocol. Based on CPI-C, it considerably simplifies the programming of communication processes between systems.
    RFCs enable you to call and execute predefined functions in a remote system - or even in the same system.
    RFCs manage the communication process, parameter transfer and error handling.
    http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
    Remote Function Call (RFC) is the standard SAP interface for communication between SAP systems. The RFC calls a function to be executed in a remote system.
    Synchronous RFC:
    The first version of RFC is synchronous RFC (sRFC). This type of RFC executes the function call based on synchronous communication, which means that the systems involved must both be available at the time the call is made.
    Transactional RFC (tRFC) and Queued RFC (qRFC). tRFC is used mainly to transfer ALE Intermediate Documents (IDocs).
    Transactional RFC:
    If an error occurs during a synchronous remote function call, the system cannot tell at what point the error occurred (most crucially, whether the function module was actually processed in R/3 before the operation failed). Restarting a failed call is therefore a dangerous thing to do, since you risk duplicating a completed function call.
    To alleviate this problem, you can use transactional RFC, which guarantees that each function call you issue will only be executed once, even if you submit it repeatedly to the R/3 System. The system implements this safeguard by assigning a unique transaction ID (TID) to each transaction that you submit. When you attempt to process the transaction, the system checks whether that TID has already been processed. If it has, the transaction is ignored.
    Queued RFC:
    When you use transactional RFC, you cannot guarantee the order in which the function calls will be processed in the system (it is quite possible that one call might overtake another). For cases where you need to specify a particular processing order, you can use queued RFC, which is an extension of transactional RFC. In qRFC, you place each function call in a logical queue. A function call cannot be executed until all of its predecessors in the queue have been processed. Queued RFC calls are processed asynchronously
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    http://help.sap.com/saphelp_nw04/helpdata/en/6f/1bd5b6a85b11d6b28500508b5d5211/content.htm
    Have a look at this link.
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCFESDE2/BCFESDE2.pdf
    http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
    Rewords some points.
    Rgds,
    P.Nag

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    <REMOVED BY MODERATOR>
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    • Start_Form
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    • Write_Form_Lines
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    • Read_Form_elements
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    Language: Layout sets are Language dependent. Enter the desired language here. If the entered layout set is not in that language, then the function tries to open the Form entered in its original language. The default value is SY-LANGU.
    Device: SAP Script can format a text on different device types. The device can be ‘PRINTER’ or ‘TELEX’, ‘TELEFAX’, ’ABAP’ and ‘SCREEN’.
    Dialog: Use parameter DIALOG to determine whether to display a dialog box before printing, in which the user can set several spool parameters for print formatting. Possible values: SPACE displays no print parameter screen. 'X' display print parameter screen. Default value: 'X'
    Options: Use parameter OPTIONS to set several options for print formatting. The parameter has the structure ITCPO. The user can change some of the defined settings on the print control screen. The default value for Options is ‘ ‘. We will discuss about ITCPO structure in detail later.
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    Language: Layout sets are language-dependent. Enter the desired language here. If the layout set does not exist in this language, the system tries to call the layout set in its original language. If the parameter LANGUAGE is empty, the system uses the language of the last active layout set.
    Startpage: Usually, SAP script starts with the page specified as start page in the layout set definition. If we want to start output with another layout set page, enter the name of the desired layout set page here. If the desired page is not defined, the system uses the start page defined in the layout set.
    Program: To replace program symbols, SAP script must know which active program contains the work areas for the values to be passed. If we omit the parameter, the system searches for the field values in the program that was specified in the parameter OPTIONS (field TDPROGRAM) of OPEN_FORM. If we enter a program name, the system replaces the program symbols with the values from this program up to the next END_FORM.
    Exceptions and other Export, Import parameters are self-explanatory.
    Write_Form: The system outputs the layout set element specified in parameter ELEMENT into the currently opened layout set. In the parameter WINDOW we can specify the name of a window for the output. Remember that the layout set element must be defined in this window. The parameter FUNCTION specifies how to merge the text lines to be output with any existing contents in the window. In this case, there are differences between the different window types or areas. Some of the important export parameters used in Write_Form.
    Element: Specify the name of the text element you want to output into the layout set window specified in the parameter WINDOW. The element must be defined in that layout set window. If you specify no element, the system uses the default element, if one is defined in the layout set.
    Window: Specify the name of the window into which you want to output the layout set element specified in the parameter ELEMENT. Default value for Window is ‘MAIN’.
    Function: The parameter determines how to output the text element into the respective window. The output type depends on the window type and area:
    Window Type: MAIN Area: BODY
    SET/APPEND: Appends to previous output.
    Window Type: Main Area: Top/Bottom and
    Window Type: Other than Main and all areas
    SET : Delete the old element contents and prints the new elements
    APPEND: Appends the new content to existing elements.
    Type: The system interprets this parameter only for output to the main window. The parameter determines the area of the main window into which we want to output the element. Possible values: 'TOP' header area
    'BODY' main area
    'BOTTOM' footer area
    Default value: 'BODY'
    Write_Form_Lines: This function module outputs the text lines in table LINES into the specified layout set window. The text lines must have the SAP script ITF format. From the data in the text header, the system uses only the field TDSTYLE to apply the formatting attributes defined in the specified style for this text. If the field is empty, the system uses the identically named formatting attributes (character and paragraph formats) of the layout set.
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    Header: This parameter contains the header of the text module we want to output in the current layout set. For the formatting process, the system uses only the entries in the header fields TDSTYLE and TDFORM. Structure: THEAD
    WINDOW: Enter the name of the window into which we want to output the layout set element specified in parameter ELEMENT. Default value: 'MAIN'
    FUNCTION: This parameter determines how to output the text element into the respective window. The output type depends on the window type and area: Window type MAIN, area BODY: 'SET' append to previous output 'APPEND' same as SET. DELETE' no effect. Window type MAIN, areas TOP and BOTTOM; all other windows: 'SET' delete old window or area contents and output the element 'APPEND' append the element to the existing elements 'DELETE' no effect Default value: 'SET'
    TYPE: The system interprets this parameter only for output to the main window. The parameter determines the area of the main window into which you want to output the element. Possible values: 'TOP' header area 'BODY' main area 'BOTTOM' footer area Default value: 'BODY'
    END_FORM: END_FORM ends the currently open layout set and executes the required termination processing. After calling this function module, no more layout set is active. For further output, we must start a new layout set using START_FORM. No Export parameters.
    CONTROL_FORM: Use this function module to pass SAP Script Control Commands to the layout set. The Control command is passed through the export parameter ‘COMMAND’ in quotes.
    READ_FORM_ELEMENTS: This function module fills a table with all text elements that appear in one layout set. If we specify no layout set name, the system includes all elements of the currently open layout set. If we specify a layout set, the system uses the information about the active version of the layout set, retrieved from the database. Here we have two export parameters, Form and Language and a table parameter Elements.
    READ_FORM_LINES: Use this function module to transfer the lines of a layout set element into an internal table. If we specify no layout set name, the system transfers the text lines of the currently open layout set. If we specify a layout set, the system uses the text lines of the active version of the layout set from the database. The Export parameters are Form, Language, Window and Element. If we pass these 4 parameters the function module returns a table with the lines from layout set.
    Function modules are one element. There are no types. However sometimes an RFC enabled function module is referred to as RFC Function module, but really it is just a function module. Also BAPIs are function modules, but are usually referred to as just BAPI as opposed to BAPI Function module.
    There is no different function module types , but calling the function module will be different.
    check this function calls syntax
    1. Calls a function module:
    CALL FUNCTION func.
    2. Call a function module in a different mode (asynchronous Remote Function Call):
    CALL FUNCTION func STARTING NEW TASK taskname.
    3. Call a function module in the update task:
    CALL FUNCTION func IN UPDATE TASK.
    4. Call a function module in a remote system (Remote Function Call, RFC ):
    CALL FUNCTION func DESTINATION dest.
    5. Asynchronous call to a function module with transactional processing (transactional Remote Function Call):
    CALL FUNCTION func IN BACKGROUND TASK.
    qRFC with output queue
    6. Call a function module that can be activated in the context of enhancements:
    CALL CUSTOMER-FUNCTION func.
    Cheers,
    Chandru
    Edited by: Alvaro Tejada Galindo on Feb 27, 2008 11:53 AM

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