Dynamical Tree handling multiple requests

Hi,
I think I already explained well my need. I currently have an
implementation of a tree control that is dynamic. So, when I click
to open a node, it sends a request to server to ask for its
children.
Attached you have my tree code.
And here is a sample feedback I have from server in XML:
<response>
<status>OK</status>
<message/>
<data>
<item id="3" type="folder" label="Item 1.1"
isBranch="true"/>
<item id="4" type="folder" label="Item 1.2"
isBranch="false"/>
</data>
</response>
The problem is that if I the user clicks too fast to open two
branches, only the last request is added. THe other request is
lost, but its node keeps the down arrow. If I try to close it then,
it crashes the app.
My question is how do I make this code able to work with
simultaneous requests? I already tried via AsyncToken without
success. The main problem using tokens is how to pick the selected
item then. =\
Thanks in advance,
Best regards,
Guilherme Blanco

Zoram wrote:
So can u kindly advice me where should I use Servlets here in my application in order to overcome the problem.Dude, you need to study struts as well. There is an underlying servlet handling all the requests, and based on action name it decides which action class it needs to call. All this is done behind the scenes what you as a developer do is write your logic in the Action class (or may be call some services from it). So it would be easier for us, if you can share the code where you have written the logic as well your Action class code.

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java forum...
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Serlets are already threaded. The application container instantiates the servlet, then uses this instance in a new thread for every use.
This is the reason that you should use (almost) no instance variables in a Servlet, but rather that (almost) everything should be local to the method.

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Hi,
I am new to Servlets. I have doubt regarding ... Handling multiple requests to a servlet at a time.
If we send a single request to a servlet, as know that group of objects such as servlet, servletContext, servletConfig, request, response and etc are created in the server, And if 1000's of requests are sent to a same servlet at a time, and if server memory capacity is less, then 1000's of objects are created in a server which would be heavy burden to Server. How to handle the application and development in such situation?
Kind regards,
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Hi veerendra reddy ,
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Can TCP/IP send ports sends multiple request ?
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Here's a quote from the Servlet spec (2.3):
After deployment of the web application, and before a request causes the container
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Hi All,
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Hi Srinivasa,
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Hi,
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Thanks!

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hi all
I wrote a client server program to handle requests from client.I have 2 types of requests, one is to submit comments to the server other is to view comments on the server.I have tested the app and it works fine for either of them(independently) but they don't work both together i.e when i submit a comment and view it,it's stuck and when i close the program it gives SocketException :Connection reset.
on client side:
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on the server side:
I check the string and give the client what it wants.
I want to know if there's any other way to send requests other than passing it as a string.
I can post my code if needed.
thanks,
Sree

Here is my client code,minimized it to the extent possible and it might give some compilation problems since i didn't include all the functions needed but i think you should be able to get an idea if i'm doing something wrong.
Can give you my server code if needed.
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
public class Test {
     JButton submit_button;
     JButton view_button;
     Socket client;
      JButton get_submit_button() {
               if (submit_button == null) {
                    submit_button = new JButton();
                    submit_button.setText("Submit");
                    submit_button.addActionListener(new java.awt.event.ActionListener() {
                         public void actionPerformed(java.awt.event.ActionEvent e) {
                              send_comments_to_server();
               return submit_button;
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               String host = "C001192097";     //server host name
               if(client == null || client.isClosed()){
                try {
                     client = new Socket(host, 4321);
                }catch (UnknownHostException exception){
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                catch (IOException exception){
                     System.err.println("I/O error with " + host);
               return client;
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                try
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                     DataOutputStream output_stream = new DataOutputStream(client.getOutputStream());
                     BufferedReader stream_input = new BufferedReader(new InputStreamReader(client.getInputStream()));
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                     User_Data user_data = new User_Data(); //function that returns client details such as host name and stuff
                     String user_info = "User Name: "+user_data.user_name+" "+"Host Name: "+user_data.host_name+" "+"Domain Name: "+ user_data.domain_name;
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                     comment.summary = comment_report;
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                     output_stream.writeBytes(report+"\n");
//                     output_stream.close();
//                     stream_input.close();
//                     client.close();
                }catch(IOException e){
                     e.printStackTrace();
          void receive_comments_from_server(){
               String line;
               StringBuffer comments = new StringBuffer();
               try
                     Socket client = check_client_connection();
                     DataOutputStream output_stream = new DataOutputStream(client.getOutputStream());
                     BufferedReader stream_input = new BufferedReader(new InputStreamReader(client.getInputStream()));
                     String msg = "view comments";
                     output_stream.writeBytes(msg);
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                         while((line = stream_input.readLine()) != null){
                              comments.append(line);
                          System.out.println("Comments from server "+comments);
                    } catch (IOException e) {
                         e.printStackTrace();
          JButton get_view_button() {
               if (view_button == null) {
                    view_button = new JButton();
                    view_button.setText("View Comments");
                    view_button.addActionListener(new java.awt.event.ActionListener() {
                         public void actionPerformed(java.awt.event.ActionEvent e) {
                              System.out.println("request sent");
                              receive_comments_from_server();
               return view_button;
}thanks
Sree

How to enable Sql Dependency OnDataChange event to handle multiple request at a time

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void OnDataChange(object sender, SqlNotificationEventArgs e)
((SqlDependency)sender).OnChange -= OnDataChange;
BBALogger.Write("PartIndexer Service RegisterNotification called end", BBALogger.MsgType.Info);
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MailSend(); // notification mail send
BBALogger.Write("PartIndexer Service SqlNotificationSource.Timeout error", BBALogger.MsgType.Error);
Environment.Exit(1);
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BBALogger.Write("PartIndexer Service SqlNotificationSource.Data", BBALogger.MsgType.Error);
Environment.Exit(1);
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BBALogger.Write("PartIndexer Service Data changed", BBALogger.MsgType.Info);
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Hi,
You should be able to delete all nodes selected by an XPath expression... Have a look at this...
http://docs.oracle.com/cd/E28280_01/dev.1111/e15866/ui_ref.htm#i1290003
Cheers,
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Dear friends,
in my application i have a html form and a servlet
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regards
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Your using html and a servlet? I suggest JSP and a servlet. I also suggest reading book on JSP that also covers servlets. Keep in mind that in proper MVC design, the JSP pages only displays data and submits back to the servlet. It doesn't contain business logic. The servlet calls business logic, gets data from business logic, puts it in request scope, then dispatches to the appropriate JSP page. The JSP page reads the data from request scope and displays it. If your not too familiar with JSP and servlets, I suggest you first create a hello world JSP page, and a hello world servlet.

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This acturally raises me a another question which i
still have some uncertainties. In another assignment i
did last semester, that was we had multiple users
using our database and accessing, retirving and
updating database by using jdbc. And what i did was
let every user call a particular method within a
javabean for setting up database connection, then goes
for the specific that needs to be dealt with. So, what
i am wondering now is that can i possibly having a
different approach, like setting up only a single
connection(ie. a public Connection objec) which being
exist all the time so that all request can get
connection by calling this object's relevant method.
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Dynamic tree UI element in the view

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Thanks alot in advance!
Points will be rewarded, Please its urgent!
Cheers,
Darshna.

Hi ,
sorry for the late reply... here is the code for onActionLoadchildren .. i am sure you wont understand this.. but lets try...
DATA:
    element_parent TYPE REF TO if_wd_context_element,
    lv_object_key1   type string,
    lv_object_type type string.
DATA:
       node_root_entry                     TYPE REF TO if_wd_context_node,
       elem_root_entry                     TYPE REF TO if_wd_context_element,
       stru_root_entry                     TYPE if_structure_view_new=>element_root_entry ,
       item_valid_from                     LIKE stru_root_entry-valid_from,
       item_plant                          LIKE stru_root_entry-plant,
       item_equi_key                       LIKE stru_root_entry-equi_key,
       item_object_key                     LIKE stru_root_entry-object_key,
       item_object_type                    TYPE string,
       item_path                           TYPE string,
       item_parent_path                    TYPE string,
      context_node                        TYPE REF TO if_wd_context_node,
       root_entry                          TYPE if_structure_view_new=>element_selected_entry.
      l_ref_componentcontroller           TYPE REF TO ig_componentcontroller.
DATA:
     node_root_info                    TYPE REF TO if_wd_context_node,
     elem_root_info                    TYPE REF TO if_wd_context_element,
      stru_root_info                    TYPE if_structure_view_new=>element_root_info .
DATA:
      element                            TYPE REF TO if_wd_context_element,
      node_selected_entry                TYPE REF TO if_wd_context_node,
      elem_selected_entry                TYPE REF TO if_wd_context_element.
DATA:
      ls_hier_return      TYPE rplm_ts_struc_elements,
      lt_hier_return      TYPE TABLE OF rplm_ts_struc_elements,
      ls_hier_return_temp TYPE rplm_ts_struc_elements,
      lt_hier_return_temp TYPE TABLE OF rplm_ts_struc_elements,
      ls_hier_level       TYPE rplm_ts_hier_level,
      lt_hier_level       TYPE TABLE OF rplm_ts_hier_level,
      ls_hier_return_sort TYPE rplm_mt_ts_hier,
      lt_hier_return_sort TYPE TABLE OF rplm_mt_ts_hier.
DATA:
       temp_hier_level TYPE if_structure_view_new=>element_hier_level,
       lt_hier_temp    TYPE TABLE OF if_structure_view_new=>element_hier_level,
       lt_temp         TYPE TABLE OF if_structure_view_new=>element_hier_level.
DATA:
       lc_path       TYPE string,
       lv_object_key TYPE string.
DATA:
       lv_hier_lines TYPE i.
DATA:
      node_entries                        TYPE REF TO if_wd_context_node,
       node_sub_entries                    TYPE REF TO if_wd_context_node,
      elem_sub_entries                    TYPE REF TO if_wd_context_element,
       stru_sub_entries                    TYPE if_structure_view_new=>element_sub_entries .
TYPES: BEGIN OF ls_hier_type,             "structure for Hierarchy table
      object(31)      TYPE c,         "Objectkey
      predecessor(31) TYPE c,         "Objectkey Predecessor
      data(2000)      TYPE c,         "Data container
      level           TYPE i,         "level of object in tree
      successors(1)   TYPE c,         "Object has successors: YES/NO/U
      display(1)      TYPE c,         "Object is displayed: YES/NO
      selected(1)     TYPE c,         "Object is selected/marked: YES/NO
      index_predec    LIKE sy-tabix, "Index predecessor
      strno           TYPE ilom_strno,"External number for func. loc.
                                     "in BOMs used for top object
   END OF ls_hier_type.
DATA:
       ls_hier     TYPE ls_hier_type,
       lt_hier     TYPE TABLE OF ls_hier_type WITH DEFAULT KEY,
       lt_mat_hier TYPE TABLE OF ls_hier_type WITH DEFAULT KEY.
" For retrieving Material Data Heirarchy
DATA:
       lh_stpo_tab     TYPE TABLE OF rihstpx ,
       lwa_stpo_tab    LIKE LINE OF lh_stpo_tab,
       check_menge     TYPE string ,
       check_meins     TYPE string ,
       lwa_mat_hier    LIKE LINE OF lt_mat_hier ,
       lt_dup_mat_hier LIKE lt_mat_hier,
       lv_len          TYPE i,
       lv_len_temp     TYPE i .
DATA:
       lv_equnr TYPE equi-equnr,
       lv_tplnr TYPE iflo-tplnr,
       lv_matnr TYPE mast-matnr.
DATA:
       lv_cnt   TYPE i,
       lv_index TYPE i.
DATA:
       lv_path        TYPE string,
       lv_parent_path TYPE string,
       pos            TYPE string,
       separator      TYPE c VALUE '.',
       max_level      TYPE i,
       temp_level     TYPE i,
       counter        TYPE i VALUE 1.
TYPES: BEGIN OF ls_pred_type,             "structure for Hierarchy table
     parent(31)      TYPE c,         "Objectkey Predecessor
     path(2000)      TYPE c,         "Data container
     index_predec    LIKE sy-tabix, "Index predecessor
END OF ls_pred_type.
DATA:
      ls_pred TYPE ls_pred_type,
      lt_pred TYPE TABLE OF ls_pred_type WITH DEFAULT KEY.
DATA:
      lv_int_obj_key TYPE string,
      obj_len        TYPE i,
      lv_funcloc_ext TYPE ilom_strno,
      lv_funcloc     TYPE itob-tplnr.
DATA:
      lv_level        TYPE i,
      lv_temp         TYPE i,
      lt_path_entries TYPE string_table.
DATA:
      node_general                        TYPE REF TO if_wd_context_node,
      elem_general                        TYPE REF TO if_wd_context_element,
      stru_general                        TYPE if_structure_view_new=>element_general ,
      item_collapse_visibility            LIKE stru_general-collapse_visibility.
DATA:
      elem_context                        TYPE REF TO if_wd_context_element,
      stru_context                        TYPE if_structure_view_new=>element_context ,
      item_expand_all                     LIKE stru_context-expand_all.
lv_path = path.
Get Element whose children shall be loaded
element_parent = wd_context->path_get_element( lv_path ).
element_parent->get_attribute(
      EXPORTING
        name = `OBJECT_KEY`
      IMPORTING
        value = LV_object_key ).
element_parent->get_attribute(
      EXPORTING
        name = `OBJECT_TYPE`
      IMPORTING
        value = lv_object_type ).
node_root_entry = wd_context->get_child_node( name = wd_this->wdctx_root_entry ).
get element via lead selection
elem_root_entry = node_root_entry->get_element( ).
get single attribute
elem_root_entry->get_attribute(
    EXPORTING
      name = `VALID_FROM`
    IMPORTING
      value = item_valid_from ).
elem_root_entry->get_attribute(
      EXPORTING
        name = `PLANT`
      IMPORTING
        value = item_plant ).
item_object_type = lv_object_type.
if lv_object_type eq 'EQUI'.
item_object_key = ''.
item_equi_key = lv_object_key.
elseif lv_object_type eq 'FUNCLOC'.
item_object_key = lv_object_key.
item_equi_key = ''.
ELSE.
lv_matnr = lv_object_key.
For BOM, material and Assembly
endif.
IF item_object_type EQ 'EQUI'.
    lv_equnr = lv_object_key.
ELSEif item_object_type eq 'FUNCLOC'.
    lv_tplnr = lv_object_key.
ELSE.
    LV_MATNR = lv_object_key.
    exit.
ENDIF.
CALL FUNCTION 'PM_HIERARCHY_CALL'
    EXPORTING
      datum             = item_valid_from
      equnr             = lv_equnr
      tplnr             = lv_tplnr
      matnr             = lv_matnr
      levdo             = '99'
      levup             = '00'
      sanin             = 'X'
      select_equi       = 'X'
      select_iflo       = 'X'
      select_stpo       = 'X'
      selmod            = 'D'
      stkkz             = ''
      werks             = item_plant
      with_equi         = 'X'
      with_equi_hier    = 'X'
      with_iflo_hier    = 'X'
      with_btyp         = 'X'
      with_mara         = 'X'
      with_ibase_hier   = ''
      capid             = ''
      emeng             = 0
    IMPORTING
      et_hier           = lt_hier
    EXCEPTIONS
      no_hierarchy      = 1
      no_object_defined = 2
      no_selection      = 3
      no_valid_equnr    = 4
      no_valid_matnr    = 5
      no_valid_selmod   = 6
      no_valid_tplnr    = 7
      OTHERS            = 8.
LOOP AT lt_hier INTO ls_hier.
    ls_hier_return-object_key = ls_hier-object.
    ls_hier_level-object_key = ls_hier-object.
    ls_hier_level-predecessor = ls_hier-predecessor.
    lv_len = strlen( ls_hier-object ).
    IF lv_len GT 1.
      lv_len_temp = lv_len - 1.
    ELSEIF
    lv_len_temp = lv_len.
    ENDIF.
    ls_hier_level-level = ls_hier-level.
    IF ls_hier-object(1) = 'T'.
      ls_hier_return-icon = 'ICON_TECHNICAL_PLACE'.
      ls_hier_return-object_type = 'FUNCLOC'.
      IF ls_hier-successors = 'Y'.
        ls_hier_return-is_leaf = abap_false.
        ls_hier_return-is_expanded = abap_false.
        ls_hier_return-children_loaded = abap_true.
      ELSE.
        ls_hier_return-is_leaf = abap_true.
        ls_hier_return-is_expanded = abap_true.
        ls_hier_return-children_loaded = abap_true.
      ENDIF.
    ELSEIF ls_hier-object(1) = 'E'.
      ls_hier_return-icon = 'ICON_EQUIPMENT'.
      ls_hier_return-object_type = 'EQUI'.
      IF ls_hier-successors = 'Y'.
        ls_hier_return-is_leaf = abap_false.
        ls_hier_return-is_expanded = abap_false.
        ls_hier_return-children_loaded = abap_true.
      ELSE.
        ls_hier_return-is_leaf = abap_true.
        ls_hier_return-is_expanded = abap_true.
        ls_hier_return-children_loaded = abap_true.
      ENDIF.
    ELSEIF ls_hier-object+lv_len_temp(1) = 'M'.
      ls_hier_return-icon = 'ICON_MATERIAL'.
      ls_hier_return-object_type = 'MATERIAL'.
      IF ls_hier-successors = 'Y'.
        ls_hier_return-is_leaf = abap_false.
        ls_hier_return-is_expanded = abap_false.
        ls_hier_return-children_loaded = abap_false.
      ELSE.
        ls_hier_return-is_leaf = abap_true.
        ls_hier_return-is_expanded = abap_true.
        ls_hier_return-children_loaded = abap_true.
      ENDIF.
    ELSEIF ls_hier-object+lv_len_temp(1) = 'X'.
      ls_hier_return-icon = 'ICON_SUPPLY_AREA'.
      ls_hier_return-object_type = 'MATBOM'.
      IF ls_hier-successors = 'Y'.
        ls_hier_return-is_leaf = abap_false.
        ls_hier_return-is_expanded = abap_false.
        ls_hier_return-children_loaded = abap_false.
      ELSE.
        ls_hier_return-is_leaf = abap_true.
        ls_hier_return-is_expanded = abap_true.
        ls_hier_return-children_loaded = abap_true.
      ENDIF.
    ELSEIF ls_hier-object+lv_len_temp(1) = 'A'.
      ls_hier_return-icon = 'ICON_MATERIAL_REVISION'.
      ls_hier_return-object_type = 'MATERIAL'.
      IF ls_hier-successors = 'Y'.
        ls_hier_return-is_leaf = abap_false.
        ls_hier_return-is_expanded = abap_false.
        ls_hier_return-children_loaded = abap_false.
      ELSE.
        ls_hier_return-is_leaf = abap_true.
        ls_hier_return-is_expanded = abap_true.
        ls_hier_return-children_loaded = abap_true.
      ENDIF.
    ENDIF.
*IF ls_hier-predecessor EQ item_object_key OR ls_hier-object EQ item_object_key.
    APPEND ls_hier_return TO lt_hier_return.
    APPEND ls_hier_level TO lt_hier_level.
*ENDIF.
    CLEAR lv_len.
    CLEAR lv_len_temp.
ENDLOOP.
lt_hier_return_temp = lt_hier_return.
DESCRIBE TABLE lt_hier LINES lv_hier_lines.
IF lv_hier_lines EQ 0.
    elem_selected_entry = wd_context->path_get_element( '1.ENTRIES.1' ).
Get children node
    elem_selected_entry->set_attribute(
    value = abap_true
    name = 'IS_LEAF' ).
ENDIF.
*************************************Deleting Now***********
SORT lt_hier_level BY level DESCENDING.
LOOP AT lt_hier_level INTO ls_hier_level.
    max_level = ls_hier_level-level.
    EXIT.
ENDLOOP.
SORT lt_hier_level BY level ASCENDING.
LOOP AT lt_hier_level INTO ls_hier_level WHERE level EQ 0.
    ls_hier_level-path = '1.ENTRIES.1'.
    ls_hier_level-parent_path = '1.ENTRIES.1'.
    MODIFY lt_hier_level FROM ls_hier_level.
ENDLOOP.
************************New design to Generate Path and Parent path
lv_cnt = 0.
temp_level = 1.
SORT lt_hier_level BY object_key ASCENDING.
LOOP AT lt_hier_level INTO ls_hier_level WHERE level EQ 1.
   lv_cnt = lv_cnt + 1.
   lv_parent_path = '1.ENTRIES.1'.
   ls_hier_level-parent_path = lv_parent_path.
   pos = lv_cnt.
   CONCATENATE lv_parent_path separator 'SUB_ENTRIES' separator pos INTO lv_path.
   ls_hier_level-path = lv_path.
   MODIFY lt_hier_level FROM ls_hier_level.
ENDLOOP.
temp_level = 1.
lv_cnt = 0.
*********************Need to call this for each level ***************************
WHILE temp_level LT max_level.
   CLEAR lt_pred.
   CLEAR ls_pred.
   LOOP AT lt_hier_level INTO ls_hier_level WHERE level EQ temp_level.
     ls_pred-parent = ls_hier_level-object_key.
     ls_pred-path = ls_hier_level-path.
     APPEND ls_pred TO lt_pred.
   ENDLOOP.
   SORT lt_pred BY parent.
   DELETE ADJACENT DUPLICATES FROM lt_pred.
   LOOP AT lt_pred INTO ls_pred.
     lv_cnt = 0.
     LOOP AT lt_hier_level INTO ls_hier_level WHERE predecessor EQ ls_pred-parent.
       lv_cnt = lv_cnt + 1.
       lv_parent_path = ls_pred-path.
       ls_hier_level-parent_path = lv_parent_path.
       lv_path = ''.
       pos = lv_cnt.
       CONCATENATE lv_parent_path separator 'SUB_ENTRIES' separator pos INTO lv_path.
       ls_hier_level-path = lv_path.
       MODIFY lt_hier_level FROM ls_hier_level.
     ENDLOOP.
   ENDLOOP.
   temp_level = temp_level + 1.
ENDWHILE.
LOOP AT lt_hier_level INTO ls_hier_level.
   LOOP AT lt_hier_return INTO ls_hier_return.
     IF ls_hier_level-object_key = ls_hier_return-object_key.
       MOVE-CORRESPONDING ls_hier_level TO ls_hier_return.
       MODIFY lt_hier_return FROM ls_hier_return.
     ENDIF.
   ENDLOOP.
ENDLOOP.
SORT lt_hier_return BY path ASCENDING.
**************************Delete the extra first character returned by PM_HIERARCHY_CALL******
LOOP AT lt_hier_return INTO ls_hier_return.
    IF ls_hier_return-object_key(1) = 'T'.
      SHIFT ls_hier_return-object_key BY 1 PLACES.
      lv_object_key = ls_hier_return-object_key.
      lv_funcloc_ext = lv_object_key.
      CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
        EXPORTING
          input = lv_funcloc_ext
        IMPORTING
          output = lv_funcloc.
      lv_int_obj_key = lv_funcloc.
      ls_hier_return-object_key = lv_int_obj_key.
    ELSEIF ls_hier_return-object_key(1) = 'E'.
      SHIFT ls_hier_return-object_key BY 1 PLACES.
      lv_object_key = ls_hier_return-object_key.
      obj_len = strlen( lv_object_key ).
      IF obj_len GE 18.
        lv_object_key = lv_object_key+0(18).
      ENDIF.
      wd_comp_controller->conv_ext_2_int(
       EXPORTING
         iv_object_key_ext = lv_object_key            " String
         iv_object_type =   'EQUI'               " String
       IMPORTING
         ev_object_key =   lv_int_obj_key                " String
      SHIFT lv_int_obj_key LEFT DELETING LEADING '0'.
      ls_hier_return-object_key = lv_int_obj_key.
    ELSE.
      SHIFT ls_hier_return-object_key BY 1 PLACES.
      lv_object_key = ls_hier_return-object_key.
      obj_len = strlen( lv_object_key ).
      IF obj_len GE 18.
        lv_object_key = lv_object_key+0(18).
      ENDIF.
      SHIFT lv_object_key LEFT DELETING LEADING '0'.
      ls_hier_return-object_key = lv_object_key.
    ENDIF.
    MODIFY lt_hier_return FROM ls_hier_return TRANSPORTING object_key object_key.
ENDLOOP.
LOOP AT lt_hier_level INTO ls_hier_level.
   IF ls_hier_level-object_key(1) = 'T'.
     SHIFT ls_hier_level-object_key BY 1 PLACES.
     lv_object_key = ls_hier_level-object_key.
     lv_funcloc_ext = lv_object_key.
     CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
       EXPORTING
         input = lv_funcloc_ext
       IMPORTING
         output = lv_funcloc.
     lv_int_obj_key = lv_funcloc.
     ls_hier_level-object_key = lv_int_obj_key.
   ELSEIF ls_hier_level-object_key(1) = 'E'.
     SHIFT ls_hier_level-object_key BY 1 PLACES.
     lv_int_obj_key = ls_hier_level-object_key.
     obj_len = strlen( lv_int_obj_key ).
     IF obj_len GE 18.
       lv_int_obj_key = lv_int_obj_key+0(18).
     ENDIF.
     wd_comp_controller->conv_ext_2_int(
      EXPORTING
        iv_object_key_ext = lv_int_obj_key            " String
        iv_object_type =   'EQUI'               " String
      IMPORTING
        ev_object_key =   lv_int_obj_key                " String
     SHIFT lv_int_obj_key LEFT DELETING LEADING '0'.
     ls_hier_level-object_key = lv_int_obj_key.
   ELSE.
     SHIFT ls_hier_level-object_key BY 1 PLACES.
     lv_int_obj_key = ls_hier_level-object_key.
     obj_len = strlen( lv_int_obj_key ).
     IF obj_len GE 18.
       lv_int_obj_key = lv_int_obj_key+0(18).
     ENDIF.
     SHIFT lv_int_obj_key LEFT DELETING LEADING '0'.
     ls_hier_level-object_key = lv_int_obj_key.
   ENDIF.
   MODIFY lt_hier_level FROM ls_hier_level TRANSPORTING object_key object_key.
ENDLOOP.
*********************Getinfo if root node else call Get_Children_Info to generate the structure as well*******
IF lv_path EQ '1.ENTRIES.1'.
    element = wd_context->path_get_element( lv_path ).
navigate from <ENTRIES> to <SUB_ENTRIES> via lead selection
    node_sub_entries = element->get_child_node( name = 'SUB_ENTRIES' ).
    element->get_attribute( EXPORTING name = 'OBJECT_KEY'
                             IMPORTING value = item_object_key ).
    element->get_attribute( EXPORTING name = `OBJECT_TYPE`
                            IMPORTING value = item_object_type ).
****************Get Info of Technical Objects*************
    wd_comp_controller->get_children_info(
      EXPORTING
        iv_lt_list =     lt_hier_return           " Rplm_Tt_Mt_Struc
        iv_path = ''
        iv_hier_level = lt_hier_level
      IMPORTING
        ev_lt_full =      lt_hier_return                   " Rplm_Tt_Mt_Struc
Create the strcuture by binding the entries to Node which is bound to the table
element = wd_context->path_get_element( lc_path ).
Get children node
        node_sub_entries = element->get_child_node( 'SUB_ENTRIES' ).
        CALL METHOD node_sub_entries->bind_table
          EXPORTING
            new_items            = lt_hier_return
            set_initial_elements = abap_true.
@TODO handle not set lead selection
   IF ( node_entries IS INITIAL ).
   ENDIF.
   lv_temp = 1.
***************Sort the LT_HIER_TABLE appropriately ******
   LOOP AT lt_hier_return INTO ls_hier_return .
     MOVE-CORRESPONDING ls_hier_return TO ls_hier_return_sort.
     ls_hier_return_sort-path_length = strlen( ls_hier_return_sort-path ).
     APPEND ls_hier_return_sort TO lt_hier_return_sort.
   ENDLOOP.
   SORT lt_hier_return_sort BY path_length ASCENDING path ASCENDING.
   CLEAR lt_hier_return.
   LOOP AT lt_hier_return_sort INTO ls_hier_return_sort.
     MOVE-CORRESPONDING ls_hier_return_sort TO ls_hier_return.
     APPEND ls_hier_return TO lt_hier_return.
   ENDLOOP.
*wd_comp_controller->gv_master_data = lt_hier_return.
   LOOP AT lt_hier_return INTO ls_hier_return.
     lv_path = ls_hier_return-path.
     lc_path = ls_hier_return-parent_path.
     IF lv_path NE '1.ENTRIES.1'.
       element = wd_context->path_get_element( lc_path ).
Get children node
       node_sub_entries = element->get_child_node( 'SUB_ENTRIES' ).
Now, create the children elements
       element->get_attribute( EXPORTING name = 'OBJECT_KEY'
                               IMPORTING value = ls_hier_level-predecessor ).
Create the strcuture by binding the entries to Node which is bound to the table
       CALL METHOD node_sub_entries->bind_structure
         EXPORTING
           new_item             = ls_hier_return
           set_initial_elements = abap_false.
     ENDIF.
   ENDLOOP.
Only when a new level is reached we create one more child node
else we attach our elements to same child node
    element = wd_context->path_get_element( item_path ).
Get children node
    element->set_attribute(
    value = abap_false
    name = 'IS_EXPANDED' ).
ENDIF.
navigate from <CONTEXT> to <GENERAL> via lead selection
node_general = wd_context->get_child_node( name = wd_this->wdctx_general ).
get element via lead selection
elem_general = node_general->get_element( ).
get single attribute
elem_general->set_attribute(
    name = `COLLAPSE_VISIBILITY`
    value = abap_false ).
node_selected_entry = wd_context->get_child_node( name = if_structure_view_new=>wdctx_selected_entry ).
get element via lead selection
elem_selected_entry = node_selected_entry->get_element( ).
get single attribute
elem_selected_entry->set_attribute(
      name = `OBJECT_KEY`
      value = '' ).
elem_selected_entry->set_attribute(
        name = `OBJECT_TYPE`
        value = '' ).
get element via lead selection
elem_context = wd_context->get_element( ).
get single attribute
elem_context->set_attribute(
    name = `EXPAND_ALL`
    value = abap_false ).
wd_this->enable_buttons(
endmethod.

How to handle multiple clients with DatagramSocket

I am trying to handle multiple clients with 1 datagramSocket bind to one port (basically I have only one port to use, and I can not use TCP or any other ports). At the server side I have two threads one for receiving packets and buffering them, another for processing the packets in the buffer and sending replies.
I can have multiple clients sending datagramPackets to me and I will have to process the packets and send them to DIFFERENT clients. Ex. Client 1 sends datagramPacket to Server which sends the processed packet to Client 2. Also Client 2 sends a datagramPacket to Server which again processes the packet and sends it to Client1. May have Client 3 and 4 doing the same thing at the same time... and so on...
My root class is creating the datagramSocket(somePort) and two threads (receiver and sender). How can I use the socket that I created in these two threads??
I have done the following and I am getting "java.net.bindexception". When I am sending stuff from Client1 to Client2 everything is fine but when I start sending something from Client2 to Client 1, I get the bindexception... Client 1 is using port 3000, Client 2 is using port 4000.
I really don't have a lot of experience in socket programming so I am not sure if there is a much simpler way to do this. I appreciate all the tips and help that I can get...
Thanks...
class UDP_serv
     static DatagramSocket udpSocket;
     final static int SERVER_PORT     = 2000;
     public static void main(String[] args) throws SocketException
          udpSocket= new DatagramSocket(SERVER_PORT);
          new DataReceiver().start ();
          new DataSender().start ();
     static class DataReceiver extends Thread
          DataReceiver()
               Thread.currentThread().setName("DataReceiver");
          public void run()
               while (true)
                    byte pckt[] = new byte [MaxMsgSize];
                    DatagramPacket dp = new DatagramPacket (pckt, pckt.length);
                    try
                         udpSocket.receive (dp);
                         //PUSH TO RECEIVE BUFFER
                    catch(Exception e)
                         e.printStackTrace();
     static class DataSender extends Thread
          DataSender()
               Thread.currentThread().setName("DataSender");
          public void run()
               while (true)
                    processDataMsg();
      static void processDataMsg()
         DatagramPacket op;
         InetAddress DA = null;
         int DP = 0;
         byte [] outPacket = null;
         // POP FROM RECEIVE BUFFER
         // SOME PROCESSING HERE
         // Set Destination Address (DA)
         // Set Destination Port (DP)
         // DA and DP are the forwarding IP and Port addresses
         // not the addresses original packet was sent from.
         try
          op = new DatagramPacket (outPacket, outPacket.length,DA, DP);
          udpSocket.send(op);
         catch (IOException e)
          e.printStackTrace();
}Also for development and testing purposes, I am running the two clients and the server on the same machine (windows xp-32b) so all of the Destination IP Addresses are 127.0.0.1. and as I said Ports that I am using are 2000, 3000, 4000 (Server, Client1, Client2).

Hmm I have minimized the code and it seems to be working now.
I think I have an error in the header portion of the data I am sending, where I am storing the source IP/Port and destination IP/Port. I think the server in the middle is messing these values up while sending them to the destination Client. Because the destination client actually receives the stuff and sends the reply back to the server, but the reply packet's headers has 0/0 as the dest IP / Port...
Server is giving me java.net.BindException: Cannot assign requested address error when it tries to forward the reply it received from the client2 as the address it is trying to send is 0!
I guess it doesnt just give this error when you try to open two sockets to the same port...
Paul, Thanks for the direction on how to proceed... took me a while get the minimized code but at least figured out the problem. Well still have to make sure that is THE problem though :)
As far as the statics goes how can I change those to non static ones? Where do I make an instance of the top level class that creates the threads? and how do I pass the DatagramSocket to the threads/ if I dont need to pass how do I call or use the datagramSocket I created in the top level class? I mean do I still kinda have it like a global variable on the top?? A very simple example would be much appreciated...
I think these might be really basic questions but I am having a rough time with the hierarchy in java...

Is it possible to handle multiple events using Jscript for a button in Apex

Hi,
I've application wherein in one of the pages for a button, I need to trigger 2 events as: 1. redirect to a new page upon 'click' of the button
2. display a set of values on 'mouse over' that button.
I'm able to handle both separately, but not in one button. I would like to know if there is any limitation in Apex that we cant handle multiple events? Currently I've put a text item near the button, and called the Jscript for mouse over event in that as a temporary workaround. Can someone let me know if this is feasible? If not any other alternative to handle this?
Thanks in advance,
gsachidh

Hi Gsachidh,
well interesting problem you're facinng. Indeed, it can't be specified using the 'Button Attributes' So we have to come up with an workaround.
A quick en dirty solution would be to specify it with the 'Optional URL Redirect options'. In a normal button, with processing on same page, this would be 'no target'. but in case of additional things to be done this can be used, using an target URL. I used this many times, in example with popUp windows for refreshing the caller object when changes are made. In your case we have to add next to the href an onmouseover event. this can be done with;
Target set to => URL
URL - target => javascript:doSubmit('<button_name>');" onMouseOver="javascript:showTooltip('tooltip');"
Here the " is the key, letting ApEx know the target (href) is doSubmit('<button_name>'), just like when no target would be specified and adding a new javascript event; onMouseOver.
Although this is a dirty solution in my opinion, it is the best i could come up with. I have another idea in how to do this, that is by adding this event dynamically with javascript with an addEvent. But i don't have an example at the moment for this scenario.
Simon
Message was edited by:
S1M0N

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