Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/StatsDumper.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
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0
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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1 package org.dancres.blitz;
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2
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3 import java.net.*;
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4
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5 import java.util.logging.Level;
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6
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7 import org.dancres.blitz.disk.Disk;
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8
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9 import org.dancres.blitz.stats.StatsBoard;
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10 import org.dancres.blitz.stats.Stat;
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11
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12 /**
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13 <p>This class implements a remote access feature which allows a programmer
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14 to trigger dumping of useful debug information. It is triggered by
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15 <code>telnet</code>'ing to the debug port. StatsDumper detects the connection,
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16 closes it and dumps relevant output to console.</p>
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17
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18 <p>For example, if Blitz were suffering from a deadlock, one could arrange
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19 for a connection on the debug port, to dump lock information, the default
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20 implementation (note that it requires a tweak to Db for it to provide the
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21 right information, contact dan@dancres.org, for information).</p>
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22
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23 <p>If the port number is non-zero, the StatsDumper is enabled otherwise it's
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24 disabled. See <code>debugPort</code> in the configuration file.</p>
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25
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26 @todo Find a nice way to handle the stack tracing stuff - only works on
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27 JDK 1.5
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28 */
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29 class StatsDumper implements Runnable, ActiveObject {
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30
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31 private static StatsDumper theStatsDumper;
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32
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33 private Thread theDebugThread;
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34 private boolean stopDebugging;
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35 private long theCycleTime;
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36
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37 static void start(long aPause) {
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38 try {
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39 if (aPause == 0)
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40 return;
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41
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42 System.err.println("Starting Stats Dumper: " + aPause);
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43
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44 theStatsDumper = new StatsDumper(aPause);
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45 } catch (Exception anE) {
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46 System.err.println("StatsDumper didn't start!");
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47 anE.printStackTrace(System.err);
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48 }
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49 }
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50
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51 private StatsDumper(long aPause) throws Exception {
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52 theCycleTime = aPause;
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53 ActiveObjectRegistry.add(this);
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54 }
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55
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56 public void begin() {
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57 theDebugThread = new Thread(this, "StatsDumper");
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58 theDebugThread.start();
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59 }
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60
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61 public void halt() {
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62 synchronized(this) {
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63 stopDebugging = true;
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64 }
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65
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66 theDebugThread.interrupt();
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67
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68 try {
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69 theDebugThread.join();
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70 theDebugThread = null;
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71 } catch (InterruptedException anIE) {
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72 SpaceImpl.theLogger.log(Level.SEVERE,
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73 "Failed to wait for StatsDumper",
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74 anIE);
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75 }
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76 }
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77
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78 public void run() {
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79 synchronized(this) {
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80 while(!stopDebugging) {
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81 try {
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82
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83 wait(theCycleTime);
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84
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85 if (stopDebugging) {
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86 continue;
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87 }
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88
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89 Stat[] myStats = StatsBoard.get().getStats();
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90 for (int i = 0; i < myStats.length; i++) {
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91 System.err.println(myStats[i]);
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92 }
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93
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94 /*
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95 Only works on JDK 1.5!!!!!!!!
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96
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97
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98 Map myTraces = Thread.getAllStackTraces();
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99
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100 Iterator myThreads = myTraces.keySet().iterator();
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101 while (myThreads.hasNext()) {
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102 Thread myThread = (Thread) myThreads.next();
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103 StackTraceElement[] myTrace =
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104 (StackTraceElement[]) myTraces.get(myThread);
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105
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106 System.err.println();
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107 System.err.println(myThread);
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108 System.err.println();
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109 for (int i = 0; i < myTrace.length; i++) {
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110 System.err.println(" " + myTrace[i]);
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111 }
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112 }
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113
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114 */
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115 } catch (InterruptedException anIE) {
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116 SpaceImpl.theLogger.log(Level.SEVERE, "StatsDumper interrupted");
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117 } catch (Exception anE) {
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118 System.err.println("Whoops couldn't do dump stats");
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119 }
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120 }
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121 }
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122 }
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123 }