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

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
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1 package org.dancres.blitz.entry;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.io.InputStreamReader;
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6 import java.io.Serializable;
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7
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8 import java.util.Map;
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9 import java.util.HashMap;
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10 import java.util.Collection;
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11
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12 import java.util.logging.*;
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13
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14 import net.jini.config.ConfigurationFile;
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15 import net.jini.config.Configuration;
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16 import net.jini.config.ConfigurationException;
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17
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18 import org.dancres.blitz.disk.Disk;
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19 import org.dancres.blitz.disk.Syncable;
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20
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21 import org.dancres.blitz.config.ConfigurationFactory;
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22
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23 import org.dancres.blitz.Logging;
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24
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25 import org.dancres.blitz.lease.LeaseReaper;
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26
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27 import org.dancres.blitz.txn.TxnManager;
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28
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29 import org.prevayler.SnapshotContributor;
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30
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31 public class EntryRepositoryFactory implements Syncable, SnapshotContributor {
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32 private static final String LOG_COUNTS = "logCounts";
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33
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34 private static LeaseReaper theReaper;
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35
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36 private static final Logger theLogger =
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37 Logging.newLogger("org.dancres.blitz.entry.EntryRepositoryFactory");
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38
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39 private static EntryRepositoryFactory theReposFactory =
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40 new EntryRepositoryFactory();
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41
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42 private Map theRepositories = new HashMap();
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43
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44 private boolean logCountOnBoot;
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45 private boolean haveRegisteredForSnapshot = false;
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46 private Object theLogLock = new Object();
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47
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48 private EntryRepositoryFactory() {
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49 try {
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50 long myReapTime =
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51 ((Long)
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52 ConfigurationFactory.getEntry("leaseReapInterval",
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53 long.class,
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54 new Long(0))).longValue();
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55
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56 InputStream myStream =
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57 getClass().getResourceAsStream("filters.properties");
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58
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59 if (myStream == null)
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60 throw new RuntimeException("Reap filters are missing!");
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61 else {
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62 Configuration myConfig =
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63 new ConfigurationFile(new InputStreamReader(myStream),
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64 null);
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65
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66 theReaper = new LeaseReaper(myConfig, myReapTime);
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67 }
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68
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69 } catch (Exception anE) {
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70 theLogger.log(Level.SEVERE, "Failed to init reaper", anE);
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71 throw new RuntimeException("Critical failure starting reaper");
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72 }
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73
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74 /*
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75 Figure out if instance counts should be put into checkpoints and
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76 log files. Note we don't actually do anymore work here. The
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77 remainder is done using barrier methods in this class and in
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78 EntryReposImpl.
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79
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80 EntryReposImpl is responsible for trapping "first use" and emitting
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81 a record into the log.
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82
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83 EntryRepositoryFactory is responsible for placing similar records
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84 into the checkpoint snapshot.
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85 */
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86 try {
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87 logCountOnBoot =
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88 ((Boolean)
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89 ConfigurationFactory.getEntry(LOG_COUNTS,
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90 Boolean.class,
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91 new Boolean(false))).booleanValue();
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92
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93 } catch (ConfigurationException aCE) {
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94 theLogger.log(Level.SEVERE,
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95 "Failed to load logInstanceCounts setting", aCE);
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96 }
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97
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98 Disk.add(this);
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99 }
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100
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101 public static void reap() {
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102 theReaper.reap();
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103 }
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104
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105 public static EntryRepositoryFactory get() {
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106 /*
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107 Anyone wishing to access the factory's functions must go through
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108 this method first so it's the ideal place to barrier for registering
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109 with TxnManager to supply instance count records to checkpoints.
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110 */
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111 theReposFactory.registerBarrier();
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112
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113 return theReposFactory;
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114 }
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115
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116 /*
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117 Unfortunately, we may be instantiated during recovery at which point
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118 the transaction manager is not available so we must stave off
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119 registration of our SnapshotContributor until recovery is completed.
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120 */
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121 private void registerBarrier() {
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122 synchronized(theLogLock) {
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123 if (!logCountOnBoot || TxnManager.get().isRecovery())
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124 return;
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125 else if (!haveRegisteredForSnapshot) {
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126 /*
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127 If we have to log counts at boot we also need to log them at
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128 checkpoints - register SnapshotContributor
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129 */
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130 TxnManager.get().add(this);
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131 haveRegisteredForSnapshot = true;
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132 }
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133 }
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134 }
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135
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136 public Serializable getContribution() {
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137 EntryReposImpl[] myRepos = getRepositoriesSnapshot();
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138
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139 InstanceCheckpoint myContribution = new InstanceCheckpoint();
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140
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141 for (int i = 0; i < myRepos.length; i++) {
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142 myContribution.add(myRepos[i].getType(),
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143 myRepos[i].getTotalLiveEntries());
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144 }
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145
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146 return myContribution;
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147 }
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148
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149 public boolean isDebugLogging() {
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150 return logCountOnBoot;
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151 }
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152
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153 /**
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154 Locate the EntryRepository instance for the specified type, creating
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155 a new, empty one, if it's not already present
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156 */
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157 public synchronized EntryRepository get(String aType)
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158 throws IOException {
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159 EntryReposImpl myRepos = (EntryReposImpl) theRepositories.get(aType);
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160
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161 if (myRepos == null) {
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162 Storage myStore = StorageFactory.getStorage(aType);
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163 myStore.init(false);
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164
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165 myRepos = new EntryReposImpl(myStore);
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166 theRepositories.put(aType, myRepos);
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167 }
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168
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169 return myRepos;
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170 }
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171
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172 /**
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173 Locate the EntryRepository instance for the specified type.
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174 If it doesn't already exist, return <code>null</code>.
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175 */
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176 public synchronized EntryRepository find(String aType)
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177 throws IOException {
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178
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179 EntryReposImpl myRepos = (EntryReposImpl) theRepositories.get(aType);
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180
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181 if (myRepos == null) {
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182 Storage myStore = StorageFactory.getStorage(aType);
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183
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184 if (myStore.init(true)) {
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185 myRepos = new EntryReposImpl(myStore);
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186 theRepositories.put(aType, myRepos);
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187 }
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188 }
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189
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190 return myRepos;
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191 }
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192
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193 synchronized EntryReposRecovery getAdmin(String aType)
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194 throws IOException {
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195 return (EntryReposRecovery) get(aType);
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196 }
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197
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198 public void sync() throws Exception {
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199 EntryReposImpl[] myRepositories = getRepositoriesSnapshot();
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200
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201 for (int i = 0; i < myRepositories.length; i++) {
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202 myRepositories[i].sync();
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203 }
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204 }
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205
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206 public void close() throws Exception {
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207 EntryReposImpl[] myRepositories = getRepositoriesSnapshot();
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208
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209 for (int i = 0; i < myRepositories.length; i++) {
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210 myRepositories[i].close();
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211 }
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212 }
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213
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214 private EntryReposImpl[] getRepositoriesSnapshot() {
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215 synchronized(this) {
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216 Collection myRepositories = theRepositories.values();
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217
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218 EntryReposImpl[] myResult =
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219 new EntryReposImpl[myRepositories.size()];
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220
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221 return (EntryReposImpl[]) myRepositories.toArray(myResult);
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222 }
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223 }
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224
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225 public void deleteAllEntrys() throws IOException {
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226 EntryReposImpl[] myRepos = getRepositoriesSnapshot();
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227
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228 for (int i = 0; i < myRepos.length; i++) {
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229 myRepos[i].deleteAllEntrys();
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230 }
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231 }
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232
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233 public void deleteAllRepos() throws IOException {
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234 // For each repository, close them and invoke delete
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235 synchronized(this) {
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236 EntryReposImpl[] myRepos = getRepositoriesSnapshot();
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237
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238 for (int i = 0; i < myRepos.length; i++) {
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239 myRepos[i].close();
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240 myRepos[i].delete();
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241 }
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242
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243 theRepositories.clear();
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244 }
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245 }
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246
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247 static LeaseReaper getReaper() {
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248 return theReaper;
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249 }
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250 }