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1
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2 package nabble.view.web.tools;
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3
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4 import com.yourkit.api.Controller;
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5 import com.yourkit.api.ProfilingModes;
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6 import fschmidt.util.java.HtmlUtils;
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7 import org.slf4j.Logger;
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8 import org.slf4j.LoggerFactory;
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9
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10 import javax.servlet.ServletException;
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11 import javax.servlet.http.HttpServlet;
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12 import javax.servlet.http.HttpServletRequest;
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13 import javax.servlet.http.HttpServletResponse;
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14 import java.io.IOException;
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15 import java.io.PrintWriter;
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16
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17
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18 public final class Profile extends HttpServlet {
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19
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20 private static final Logger logger = LoggerFactory.getLogger(Profile.class);
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21
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22 private static Controller profiler;
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23 static {
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24 try {
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25 profiler = new com.yourkit.api.Controller();
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26 } catch (Exception e) {
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27 logger.info("Profiler error: " + e);
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28 }
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29 }
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30
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31 protected void service(HttpServletRequest request,HttpServletResponse response)
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32 throws ServletException, IOException
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33 {
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34 PrintWriter out = response.getWriter();
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35
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36 float oneMega = 1024f * 1024f;
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37 float free = Runtime.getRuntime().freeMemory() / oneMega;
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38 float total = Runtime.getRuntime().totalMemory() / oneMega;
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39 float used = total - free;
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40
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41 String action = request.getParameter("action");
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42 if ("gc".equals(action)) {
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43 System.gc();
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44 response.sendRedirect("/tools/Profile.jtp");
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45 return;
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46 } else if ("memory".equals(action)) {
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47 String file;
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48 try {
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49 file = profiler.captureSnapshot(ProfilingModes.SNAPSHOT_WITH_HEAP);
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50 } catch(Exception e) {
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51 throw new RuntimeException(e);
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52 }
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53 response.sendRedirect("/tools/Profile.jtp?file="+HtmlUtils.urlEncode(file));
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54 return;
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55 } else if ("cpu".equals(action)) {
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56 long seconds = Long.valueOf( request.getParameter("seconds") );
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57 String file;
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58 try {
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59 profiler.startCPUProfiling(ProfilingModes.CPU_SAMPLING, null);
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60 Thread.sleep(seconds*1000L);
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61 profiler.stopCPUProfiling();
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62 file = profiler.captureSnapshot(ProfilingModes.SNAPSHOT_WITHOUT_HEAP);
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63 } catch(Exception e) {
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64 throw new RuntimeException(e);
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65 }
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66 response.sendRedirect("/tools/Profile.jtp?file="+HtmlUtils.urlEncode(file));
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67 return;
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68 }
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69
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70 out.print( "\n<html>\n <head>\n <title>Profiler</title>\n <style type=\"text/css\">\n body {\n font-family:Verdana, Arial, Serif;\n font-size:.74em;\n }\n .gray {\n background-color: #eeeeee;\n padding: .5em;\n margin: .5em;\n font-size:100%;\n }\n </style>\n </head>\n <body>\n <div>\n <a href=\"/tools/\">Tools</a>\n </div>\n " );
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71
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72 String file = request.getParameter("file");
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73 if( file != null ) {
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74
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75 out.print( "\n<div style=\"margin:1em .5em .5em;padding:.3em\">\n <b>Snapshot File</b>: " );
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76 out.print( (file) );
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77 out.print( "\n</div>\n" );
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78
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79 }
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80
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81 out.print( "\n<table class=\"gray\">\n <tr>\n <td class=\"row-label\">Free Memory</td>\n <td>\n " );
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82 out.print( (String.format("%.2f",free)) );
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83 out.print( " Mb\n </td>\n </tr>\n <tr>\n <td class=\"row-label\">Used Memory</td>\n <td>" );
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84 out.print( (String.format("%.2f",used)) );
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85 out.print( " Mb</td>\n </tr>\n <tr>\n <td class=\"row-label\">Total Memory</td>\n <td>" );
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86 out.print( (String.format("%.2f",total)) );
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87 out.print( " Mb</td>\n </tr>\n</table>\n<input type=\"button\" onclick=\"location='/tools/Profile.jtp?action=gc'\" value=\"Run GC\"/>\n" );
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88 if (profiler == null) {
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89 out.print( "\n <div style=\"margin:1em 0\">\n Yourkit profiler is disabled on this server.\n </div>\n" );
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90 } else {
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91 out.print( "\n <div style=\"margin:1em 0\">\n <input type=\"button\" onclick=\"location='/tools/Profile.jtp?action=memory'\" value=\"Capture Memory Snapshot\"/>\n </div>\n <div style=\"margin:1em 0\">\n <form>\n <input type=\"hidden\" name=\"action\" value=\"cpu\">\n <input type=\"text\" name=\"seconds\" value=\"5\" size=\"2\"> seconds\n <input type=\"submit\" value=\"CPU Profiling\">\n </form>\n </div>\n" );
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92 }
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93 out.print( "\n</body>\n</html>\n" );
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94
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95 }
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96
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97 }
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98
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