Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/LookupStorage.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.remote;
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2
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3 import java.io.File;
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4 import java.io.Serializable;
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5 import java.io.IOException;
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6 import java.io.FileOutputStream;
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7 import java.io.ObjectOutputStream;
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8 import java.io.FileInputStream;
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9 import java.io.ObjectInputStream;
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10
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11 import java.util.logging.Level;
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12 import java.util.BitSet;
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13
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14 import net.jini.core.entry.Entry;
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15
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16 import net.jini.config.Configuration;
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17 import net.jini.config.ConfigurationException;
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18
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19 import net.jini.id.Uuid;
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20
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21 import net.jini.core.lookup.ServiceID;
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22
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23 import net.jini.discovery.DiscoveryManagement;
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24
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25 import net.jini.lookup.JoinManager;
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26
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27 import org.dancres.util.BytePacker;
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28
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29 import org.dancres.blitz.config.ConfigurationFactory;
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30
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31 import org.dancres.blitz.meta.Registry;
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32 import org.dancres.blitz.meta.RegistryAccessor;
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33 import org.dancres.blitz.meta.RegistryFactory;
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34 import org.dancres.blitz.meta.Initializer;
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35
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36 import org.dancres.blitz.disk.Disk;
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37 import org.dancres.blitz.disk.DiskTxn;
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38 import org.dancres.blitz.disk.Syncable;
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39
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40 /**
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41 This class is responsible for managing JoinManagement state saving to
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42 and reloading from disk as required.
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43
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44 @todo Need logging somewhere
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45 */
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46 public class LookupStorage implements Syncable {
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47 public static final byte INIT_ATTRS = 1;
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48 public static final byte INIT_LOCATORS = 2;
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49 public static final byte INIT_GROUPS = 4;
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50
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51 private static final String JOIN_STATE = "BlitzJoinState";
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52
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53 private static byte[] JOIN_STATE_KEY = new byte[12];
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54
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55 static {
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56 BytePacker myPacker = BytePacker.getMSBPacker(JOIN_STATE_KEY);
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57 myPacker.putInt(0, 1);
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58 }
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59
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60 private LookupData theData;
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61
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62 private Registry theRegistry;
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63
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64 public LookupStorage() throws ConfigurationException {
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65 }
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66
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67 /**
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68 * Load state from disk or create from scratch
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69 *
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70 * Warning: not thread-safe
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71 */
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72 public void init(Configuration aConfig) throws ConfigurationException {
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73 try {
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74 theRegistry =
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75 RegistryFactory.get(JOIN_STATE, new RegistryInit(aConfig));
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76 Disk.add(this);
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77
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78 DiskTxn myTxn = DiskTxn.newTxn();
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79
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80 theData = (LookupData)
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81 theRegistry.getAccessor().load(JOIN_STATE_KEY);
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82
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83 myTxn.commit();
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84
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85 // Display recovered settings for user
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86 theData.dump();
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87 } catch (Exception anE) {
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88 BlitzServiceImpl.theLogger.log(Level.SEVERE,
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89 "Exceptioned loading state",
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90 anE);
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91 throw new ConfigurationException("Failed to load join state",
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92 anE);
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93 }
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94 }
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95
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96 /**
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97 * Recover previous state (if it's not already loaded) and then
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98 * overwrite selected settings. Make sure to call saveState
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99 *
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100 * Warning: not thread-safe
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101 */
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102 public void reinit(Configuration aConfig, byte aFlags)
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103 throws ConfigurationException {
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104
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105 if (theRegistry == null)
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106 init(aConfig);
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107
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108 if ((aFlags & INIT_ATTRS) != 0) {
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109 theData.initAttrs(aConfig);
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110 }
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111
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112 if ((aFlags & INIT_LOCATORS) != 0) {
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113 theData.initLocators(aConfig);
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114 }
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115
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116 if ((aFlags & INIT_GROUPS) != 0) {
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117 theData.initGroups(aConfig);
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118 }
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119 }
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120
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121 public void sync() throws Exception {
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122 // Always in sync
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123 }
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124
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125 public void close() throws Exception {
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126 theRegistry.close();
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127 }
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128
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129 /**
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130 Recover a DiscoveryManagement object pre-configured with settings.
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131 */
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132 DiscoveryManagement getDiscMgt() throws ConfigurationException {
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133 return theData.getLookupDiscovery();
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134 }
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135
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136 /**
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137 Each JINI service has a unique (well, not quite) id
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138 */
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139 ServiceID getServiceID() {
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140 return theData.getServiceID();
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141 }
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142
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143 Uuid getUuid() {
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144 return theData.getUuid();
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Dan Creswell <dan.creswell@gmail.com>
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145 }
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146
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Dan Creswell <dan.creswell@gmail.com>
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147 /**
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Dan Creswell <dan.creswell@gmail.com>
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148 Recover any descriptive attributes to be advertised as part of the
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149 registration.
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150 */
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151 Entry[] getAttributes() throws IOException {
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152 return theData.getAttributes();
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153 }
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154
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155 synchronized void sync(JoinManager aMgr) throws IOException {
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156 theData.update(aMgr);
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157 saveState();
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158 theData.dump();
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159 }
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160
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161 public synchronized void saveState() throws IOException {
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162 DiskTxn myTxn = DiskTxn.newTxn();
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163
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164 theRegistry.getAccessor().save(JOIN_STATE_KEY, theData);
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165
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166 myTxn.commit();
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167 }
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168
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169 private class RegistryInit implements Initializer {
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170 private boolean wasExecuted;
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171
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172 private Configuration theConfig;
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173
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174 RegistryInit(Configuration aConfig) {
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175 theConfig = aConfig;
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176 }
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177
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178 public void execute(RegistryAccessor anAccessor) throws IOException {
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179
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180 LookupData myData = new LookupData();
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181
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Dan Creswell <dan.creswell@gmail.com>
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182 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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183 myData.init(theConfig);
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Dan Creswell <dan.creswell@gmail.com>
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184 } catch (ConfigurationException aCE) {
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185 BlitzServiceImpl.theLogger.log(Level.SEVERE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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186 "Exceptioned init'ing state",
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Dan Creswell <dan.creswell@gmail.com>
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187 aCE);
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Dan Creswell <dan.creswell@gmail.com>
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188 throw new IOException("Failed to init state");
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Dan Creswell <dan.creswell@gmail.com>
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189 } catch (Throwable aT) {
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190 BlitzServiceImpl.theLogger.log(Level.SEVERE,
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191 "Exceptioned init'ing state",
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Dan Creswell <dan.creswell@gmail.com>
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192 aT);
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193 throw new IOException("Failed to init state");
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194 }
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195
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196 myData.dump();
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197
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198 anAccessor.save(JOIN_STATE_KEY, myData);
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199 }
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200 }
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Dan Creswell <dan.creswell@gmail.com>
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201 }