c# - DataTable rapid population -


good day!

i have multi-thread application, purpose, in general, process fast populating message queue. messages added queue 1 thread , thread process them.

in processing thread messages must shown in grid. grid's datasource datatable. processing thread works datatable (on each message processing; nid, sid, bid - part of 1 message):

                        lockers[5].waitone();                          continue = true;                          (int = 0; <= mdatasource.tables["stations"].rows.count - 1; i++)                         {                             datarow current = mdatasource.tables["stations"].rows[i];                              if ((ushort)current["sid"] == sid &&                                 (ushort)current["nid"] == nid &&                                 (ushort)current["bid"] == bid)                             {                                 continue = false;                                 break;                             }                         }                          if (continue &&)                         {                             synccontext.post(x =>                             {                                 mdatasource.tables["stations"].beginloaddata();                                 mdatasource.tables["stations"].rows.add(                                     (fbn + 1) * 10 + 1 + dn,                                     devicelist[fbn].main.receivers[dn].channel,                                     devicelist[fbn].main.receivers[dn].pilot, sid, nid, bid,                                     devicelist[fbn].receivers[dn].mcc, latitude, longitude);                                 mdatasource.tables["stations"].endloaddata();                             },                                                                 null);                                                        }                          lockers[5].releasemutex();

lockers[5] - mutex object, mdatasource - dataset object. syncontext - synchronization context of main application form. above message queue quite fast populating, code fires 500 times in 1 second in runtime. , in message queue may repeats, mustn't shown them. problem on few first iterations of message processing thread mdatasource.tables["stations"].rows.count = 0, because of continue variable = true , have repeats in table. in next iterations see in logs rows added in table, count may still 2 (but in logs there 17 rows added). why be?

i tried change mutex object on lock(){} operator. not helped me. tried change datatable on bindinglist. not helped me. can lower count of repeats in table creating global variable private readonly int[] lastaddedstation = new int[3]; , add such expression in if block (if (continue){}): lastaddedstation[0] != sid || lastaddedstation[1] != nid || lastaddedstation[2] != bid . helped me lower repeats in table, but, in opinion, "smells". there clear ways situation?

what doing wrong? best practices on high load work datatables?

p.s. i'm sorry english, i'm not native speaker.

mainly, answered here - what difference between synchronizationcontext.send , synchronizationcontext.post? .

post method works in asynchronous mode - "drop off , continue". seems on next iteration code in post method hasn't been completed yet.

i choose add separate counter count added rows , check datatable.count .


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

jquery - javascript onscroll fade same class but with different div -

i new @ javascript , want learn new. there wrong code : why div fades @ same time. i want ask how fade different div s same class name.can me , explain me. thanks in advance. javascript: $(window).scroll(function(){ if ($( "div.fade" ).offset().top - $(window).scrolltop() <= 100){ $('.fade').addclass( "fade-in"); } else { $('.fade').removeclass("fade-in"); } }); here jsfiddle onscroll = function () { var scrolltop = $(this).scrolltop() ; $("div.fade").each(function(){ if(($(this).offset().top - scrolltop) <= 100){ $(this).toggleclass("fade-in"); } }) }
Read more