Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/stats/SwitchSettings.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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0
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1 package org.dancres.blitz.stats;
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2
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3 import java.util.LinkedList;
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4 import java.util.ArrayList;
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5 import java.util.Iterator;
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6
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7 import java.util.logging.Level;
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8
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9 import net.jini.config.ConfigurationException;
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10
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11 import org.dancres.blitz.config.ConfigurationFactory;
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12
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13 /**
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14 This class tracks currently set profiling switches and keeps listener's
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15 up-to-date on changes in switch state.
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16
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17 @todo Load default switch settings from configuration
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18 */
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19 public class SwitchSettings {
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20 private static final String STATS_SWITCHES = "stats";
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21
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22 private static SwitchSettings theSettings = new SwitchSettings();
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23
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24 private ArrayList theSwitches = new ArrayList();
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25 private LinkedList theListeners = new LinkedList();
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26
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27 SwitchSettings() {
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28 try {
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29 Switch[] mySwitches =
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30 (Switch[]) ConfigurationFactory.getEntry(STATS_SWITCHES,
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31 Switch[].class,
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32 new Switch[0]);
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33
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34 if (mySwitches.length != 0) {
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35 for (int i = 0; i < mySwitches.length; i++) {
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36 theSwitches.add(mySwitches[i]);
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37 }
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38 }
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39 } catch (ConfigurationException aCE) {
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40 StatsBoard.theLogger.log(Level.SEVERE, "Failed to load switch settings for statistics tracking", aCE);
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41 }
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42 }
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43
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44 public static SwitchSettings get() {
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45 return theSettings;
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46 }
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47
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48 public void add(SwitchListener aListener) {
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49 boolean wasAdded = false;
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50
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51 synchronized(theListeners) {
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52 if (! theListeners.contains(aListener)) {
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53 theListeners.add(aListener);
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54 wasAdded = true;
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55 }
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56 }
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57
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58 // If we added a listener - make it aware of current switch settings
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59 if (wasAdded)
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60 refresh(aListener);
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61 }
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62
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63 public void remove(SwitchListener aListener) {
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64 synchronized(theListeners) {
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65 if (theListeners.contains(aListener))
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66 theListeners.remove(aListener);
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67 }
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68 }
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69
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70 /**
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71 Update the settings of a particular switch
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72 */
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73 public void update(Switch aSwitch) {
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74 synchronized (theSwitches) {
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75 int myPos = theSwitches.indexOf(aSwitch);
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76 if (myPos != -1) {
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77 theSwitches.remove(myPos);
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78 }
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79
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80 theSwitches.add(aSwitch);
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81 }
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82
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83 synchronized(theListeners) {
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84 Iterator myListeners = theListeners.iterator();
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85
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86 while (myListeners.hasNext()) {
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87 SwitchListener myListener =
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88 (SwitchListener) myListeners.next();
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89
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90 myListener.switchFlipped(aSwitch);
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91 }
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92 }
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93 }
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94
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95 /**
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96 Update settings based on the passed array of switches
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97 */
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98 public void update(Switch[] aListOfSwitches) {
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99 for (int i = 0; i < aListOfSwitches.length; i++) {
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100 update(aListOfSwitches[i]);
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101 }
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102 }
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103
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104 /**
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105 Notify a switch listener of all currently set switches
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106 */
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107 private synchronized void refresh(SwitchListener aListener) {
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108 synchronized(theSwitches) {
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109 Iterator mySwitches = theSwitches.iterator();
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110
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111 while (mySwitches.hasNext()) {
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112 Switch mySwitch = (Switch) mySwitches.next();
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113
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114 aListener.switchFlipped(mySwitch);
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115 }
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116 }
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117 }
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118 }