java - Will this cause memory leak? -


will code causes memory leak?

when garbage collector activated? when timer finishes? or gc called though timer still running?

public static swingworker sw;  t2 = new timer (300,this);      t2.start();  @override public void actionperformed(actionevent arg0) { try {     sw = new textareamainpanelworker();     sw.execute(); } catch (throwable e) {     e.printstacktrace(); }    }

textareamainpanelworker class:

public class textareamainpanelworker extends swingworker<integer, integer> {  protected integer doinbackground() throws exception {     connectmysql.fetchmessage(mainpanel.jtep,mainpanel.sd,mainpanel.count);     return 1; }  protected void done() {     try     {         connectmysql.rodolfol(mainpanel.jtep, mainpanel.sd);     }     catch (exception e)     {         e.printstacktrace();     } }

method query database:

public static void fetchmessage(jtextpane jtep,styleddocument sd,int count  ) {     try{      string query = "select members.username, message,color chat join members on chat.user_id = members.id message_id > "+count+" , user_id != 1";     ps = con.preparestatement(query);     rs = ps.executequery();     }catch(exception e){} }  public static void rodolfol(jtextpane jtep,styleddocument sd){     try {         while(rs.next())         {             try {                 final jlabel jp = new jlabel(rs.getstring("username")+ "\n");                 jp.setalignmenty(0.75f);                 final string usernamechat = rs.getstring("username");                 jp.addmouselistener(new mouselistener(){                      @override                     public void mouseclicked(mouseevent e) {}                      @override                     public void mouseentered(mouseevent e) {                         cursor c = cursor.getpredefinedcursor(cursor.hand_cursor);                         jp.setcursor(c);                     }                      @override                     public void mouseexited(mouseevent e) {                     }                      @override                     public void mousepressed(mouseevent e) {                         if(swingutilities.isrightmousebutton(e)){system.out.print("lawl");}                         if(e.getclickcount() == 2)new onetoonechat(usernamechat);                          jp.setforeground(color.blue);                     }                      @override                     public void mousereleased(mouseevent e) {                     jp.setforeground(color.black);                     }                 });                 jp.setfont(new font("arial",font.bold,16));                 jtep.insertcomponent(jp);                 styleconstants.setforeground(mainpanel.sas2, color.black);                 mainpanel.sd.insertstring(mainpanel.sd.getlength(), ": ", mainpanel.sas2);                 styleconstants.setforeground(mainpanel.sas,new color(integer.parseint(rs.getstring("color"))));                 sd.insertstring(sd.getlength(),rs.getstring("message")+ "\n", mainpanel.sas);              } catch (badlocationexception e1) {             }finally{             }             mainpanel.count++;}     } catch (sqlexception e) {     }finally{     if (rs != null) {             try {                 rs.close();             } catch (sqlexception sqlex) { }              rs = null;         }      if (ps != null) {             try {                 ps.close();             } catch (sqlexception sqlex) { }              ps = null;         }     } }

when garbage collector activated? when timer finishes? or gc called though timer still running?

garbage collections happen @ time, feels like. generally, when application running low on memory. gc may run when timer still running putting application on pause (with parallel/throughput collector).

so have no control on when , gc kick in. may happen @ time, regardless of doing in code.


Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db : ...
Read more

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite...
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle); ...
Read more