Asking about how server can handle client disconnection

Dear sir/madam,
i'm doing my final year project and it is about a java client/server big2 game.But now i have a difficulties in dealing with the server side.
That is about how to take action on the serverside if the client suddenly disconnected.
I have read many java client/server programming scripts.But all of them doesn't mention this problem.The scrpits only assume the client side never disconnect suddenly.
I hope if you can give me some suggestions on this problem.

For my mud written in java, I used TCP/IP for the connections. When a client connects, he gets his own thread. Those threads are held in a vector in a manager class. each tick of the server does a quick run thru the vector and if the current thread/socket its on is null or !isAlive() its remove from the vector(which in turn removes it from getting any more game updates. This removal can be caused by two things. The clients disconnects by accident(kills his game, locks up has an internet connection hiccup, etc.) or he uses the games "quit" method. The quit method calls a method that does any player saving of data, etc then closes the socket, and sets it to null. thus the manager sees this and removes him frm the vecotr list on the next server tick. Seems to work great form a mud and worked really well in a multiplayer applet game I had up for a while.

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For my mud written in java, I used TCP/IP for the connections. When a client connects, he gets his own thread. Those threads are held in a vector in a manager class. each tick of the server does a quick run thru the vector and if the current thread/socket its on is null or !isAlive() its remove from the vector(which in turn removes it from getting any more game updates. This removal can be caused by two things. The clients disconnects by accident(kills his game, locks up has an internet connection hiccup, etc.) or he uses the games "quit" method. The quit method calls a method that does any player saving of data, etc then closes the socket, and sets it to null. thus the manager sees this and removes him frm the vecotr list on the next server tick. Seems to work great form a mud and worked really well in a multiplayer applet game I had up for a while.

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hi,
Create Table Control
Step 1 (Create new structure for table control)
Type is name of structure (ZTC_EKKO) and press create
Step 2 (Create Program)
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Ensure that you create a top include, and press Enter.
Accept the name created for the top include.
Press Enter.
Press Save
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Tables: ZTC_EKKO.
controls: tc100 type tableview using screen 100.
data: ok_code type sy-ucomm.
data: it_ekko type standard
table of ZTC_EKKO initial size 0,
wa_ekko type ZTC_EKKO.
data: ok_code type sy-ucomm.
Press Save and Activate
Step 4 (Create screen)
Right click the program to create a screen 100 for the dialog. Enter Short description, set screen type to Normal and enter 0 or blank into Next screen. Then move to Element List tab and enter the OK code as OK_CODE (i.e. the same as what you declared in the top include with data: ok_code type sy-ucomm).
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Press the Layout button to bring up the screen painter editor.
Press table control button and drag it on to the screen, enter the name of table control created in TOP include (TC100). Now press the yellow button for attributes and set the table control as below options
Step 6 (Populate table control )
Press the orange button (Fields). On the next screen enter ZTC_EKKO and press the Get from Dict button. Select the fields you want (all) and press enter. Now drag them onto your Table Control.
Below is the result, there will been syntax errors if we check now! So Save and go back into the flow logic tab.
Step 7 (Create flow control )
Within the flow logic of screen 100 and create two modules, one to select the data from the database and the other to move the selected fields into the table control. Also insert the two loop statements to populate and retrieve the lines of the table control.
PROCESS BEFORE OUTPUT.
MODULE STATUS_0100.
module data_retrieval.
loop at it_ekko into wa_ekko with control TC100.
module populate_screen.
endloop.
PROCESS AFTER INPUT.
loop at it_ekko.
endloop.
MODULE USER_COMMAND_0100.
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Select 10 rows of data from the EKKO table and load into the internal table it_ekko. Go back to the flow logic to load this data into the Table Control.
check this one
REPORT ZCALL_TRANS_TAB1 .
TABLES: LFA1,LFBK,lfb1.
data: BEGIN OF it_vendor occurs 0,
LIFNR LIKE LFA1-LIFNR,
bukrs like lfb1-bukrs,
END OF it_vendor.
DATA: BEGIN OF IT_BANK occurs 0,
LIFNR LIKE LFA1-LIFNR,
BANKS LIKE LFBK-BANKS,
BANKL LIKE LFBK-BANKL,
BANKN LIKE LFBK-BANKN,
koinh like lfbk-koinh,
END OF IT_BANK.
data: it_bdcdata like bdcdata occurs 0 with header line.
data: it_messages like bdcmsgcoll occurs 0 with header line.
*selection screen.
selection-screen: begin of block b1 with frame.
parameters: p_file like rlgrap-filename default 'c:/vendor.txt'
obligatory.
parameters: p_file1 like rlgrap-filename default 'c:/xyz.txt'
obligatory.
selection-screen: end of block b1.
*at selection screen.
at selection-screen on value-request for p_file.
perform f4_help using p_file.
at selection-screen on value-request for p_file1.
perform f4_help1 using p_file1.
*start of selection
start-of-selection.
*******uploading file
perform upload_file using p_file P_FILE1.
******open session.
perform populate_data.
*& Form f4_help
form f4_help using p_p_file.
data: l_file type ibipparms-path.
call function 'F4_FILENAME'
importing
file_name = l_file.
p_file = l_file.
endform. " f4_help
*& Form POPULATE_DATA
form populate_data .
DATA: L_STRING TYPE STRing.
DATA: L_COUNTER(2) TYPE n.
loop at it_vendor.
perform bdc_dynpro using 'SAPMF02K' '0106'.
perform bdc_field using 'BDC_CURSOR'
'RF02K-D0130'.
perform bdc_field using 'BDC_OKCODE'
'/00'.
perform bdc_field using 'RF02K-LIFNR'
it_vendor-lifnr.
perform bdc_field using 'RF02K-BUKRS'
it_vendor-bukrs.
perform bdc_field using 'RF02K-D0130'
'X'.
perform bdc_dynpro using 'SAPMF02K' '0130'.
perform bdc_field using 'BDC_CURSOR'
'LFBK-bankn(03)'.
perform bdc_field using 'BDC_OKCODE'
'=UPDA'.
*********bank details
CLEAR l_COUNTER.
LOOP AT IT_BANK WHERE LIFNR = IT_VENDOR-LIFNR.
l_COUNTER = l_COUNTER + 1.
clear l_string.
CONCATENATE 'lfbk-banks(' l_counter ')' into l_string.
perform bdc_field using l_string
it_bank-banks.
clear l_string.
CONCATENATE 'lfbk-bankl(' l_counter ')' into l_string.
perform bdc_field using l_string
it_bank-bankl.
clear l_string.
CONCATENATE 'lfbk-bankn(' l_counter ')' into l_string.
perform bdc_field using l_string
it_bank-bankn.
endloop.
******CALL TRANSACTION.
call transaction 'FK02' using it_bdcdata mode 'A'
messages into it_messages.
write:/ sy-subrc.
perform format_messages.
clear it_bdcdata.
refresh it_bdcdata.
endloop.
endform. " POPULATE_DATA
*& Form FORMAT_MESSAGES
form format_messages .
data: l_msg(100).
loop at it_messages.
call function 'FORMAT_MESSAGE'
exporting
id = it_messages-msgid
lang = sy-langu
no = it_messages-msgnr
v1 = it_messages-msgv1
v2 = it_messages-msgv2
v3 = it_messages-msgv3
v4 = it_messages-msgv4
importing
msg = l_msg
exceptions
not_found = 1
others = 2
write:/ l_msg.
endloop.
endform. " FORMAT_MESSAGES
*& Form bdc_dynpro
form bdc_dynpro using value(p_program)
value(p_screen).
it_bdcdata-program = p_program.
it_bdcdata-dynpro = p_screen.
it_bdcdata-dynbegin = 'X'.
append it_bdcdata.
clear it_bdcdata.
endform. " bdc_dynpro
*& Form bdc_field
form bdc_field using value(p_fnam)
value(p_fval).
it_bdcdata-fnam = p_fnam.
it_bdcdata-fval = p_fval.
append it_bdcdata.
clear it_bdcdata.
endform. " bdc_field
*& Form upload_file
form upload_file using p_p_file
p_p_file1.
CALL FUNCTION 'WS_UPLOAD'
EXPORTING
CODEPAGE = ' '
FILENAME = P_P_FILE
FILETYPE = 'DAT'
HEADLEN = ' '
LINE_EXIT = ' '
TRUNCLEN = ' '
USER_FORM = ' '
USER_PROG = ' '
DAT_D_FORMAT = ' '
IMPORTING
FILELENGTH =
TABLES
data_tab = IT_VENDOR
EXCEPTIONS
CONVERSION_ERROR = 1
FILE_OPEN_ERROR = 2
FILE_READ_ERROR = 3
INVALID_TYPE = 4
NO_BATCH = 5
UNKNOWN_ERROR = 6
INVALID_TABLE_WIDTH = 7
GUI_REFUSE_FILETRANSFER = 8
CUSTOMER_ERROR = 9
NO_AUTHORITY = 10
OTHERS = 11
IF sy-subrc <> 0.
MESSAGE I000(ZZ) WITH 'UNABLE TO UPLOAD'.
STOP.
ENDIF.
*******UPLOADING BANK DETAILS
CALL FUNCTION 'WS_UPLOAD'
EXPORTING
CODEPAGE = ' '
FILENAME = P_P_FILE1
FILETYPE = 'DAT'
HEADLEN = ' '
LINE_EXIT = ' '
TRUNCLEN = ' '
USER_FORM = ' '
USER_PROG = ' '
DAT_D_FORMAT = ' '
IMPORTING
FILELENGTH =
TABLES
data_tab = IT_BANK
EXCEPTIONS
CONVERSION_ERROR = 1
FILE_OPEN_ERROR = 2
FILE_READ_ERROR = 3
INVALID_TYPE = 4
NO_BATCH = 5
UNKNOWN_ERROR = 6
INVALID_TABLE_WIDTH = 7
GUI_REFUSE_FILETRANSFER = 8
CUSTOMER_ERROR = 9
NO_AUTHORITY = 10
OTHERS = 11
IF sy-subrc <> 0.
MESSAGE I000(ZZ) WITH 'UNABLE TO UPLOAD'.
STOP.
ENDIF.
endform. " upload_file
*& Form f4_help1
-->P_P_FILE1 text
form f4_help1 using p_p_file1.
data:l_file1 type ibipparms-path.
CALL FUNCTION 'F4_FILENAME'
IMPORTING
FILE_NAME = l_file1.
p_file1 = l_file1.
endform. " f4_help1
http://sap-img.com/abap/bdc-example-using-table-control-in-bdc.htm
Regards,
Sankar

How i can create client copy

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pls tell me step by step procedure to create client.
and client copy.

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tnxxxx

amosexy wrote:
no
i just learning today how to open connection
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Asking about how server can handle client disconnection

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