Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/NotifyLeaseHandlerImpl.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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0
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1 package org.dancres.blitz.notify; |
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2 |
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3 import java.io.IOException; |
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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 net.jini.core.lease.UnknownLeaseException; |
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8 import net.jini.core.lease.LeaseDeniedException; |
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9 |
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10 import net.jini.core.transaction.TransactionException; |
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11 |
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12 import org.dancres.blitz.disk.DiskTxn; |
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13 |
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14 import org.dancres.blitz.lease.SpaceUID; |
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15 import org.dancres.blitz.lease.LeaseHandler; |
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16 import org.dancres.blitz.lease.LeaseBounds; |
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17 |
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18 import org.dancres.blitz.txn.TxnOp; |
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19 import org.dancres.blitz.txn.TxnState; |
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20 import org.dancres.blitz.txn.TxnManager; |
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21 |
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22 import org.dancres.blitz.task.Task; |
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23 |
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24 import org.dancres.blitz.oid.OID; |
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25 |
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26 import org.dancres.blitz.util.Time; |
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27 |
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28 public class NotifyLeaseHandlerImpl implements LeaseHandler { |
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29 public boolean recognizes(SpaceUID aUID) { |
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30 return (aUID instanceof SpaceNotifyUID); |
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31 } |
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32 |
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33 public long renew(SpaceUID aUID, long aLeaseDuration) |
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34 throws UnknownLeaseException, LeaseDeniedException, IOException { |
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35 |
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36 long myDuration = LeaseBounds.boundNotify(aLeaseDuration); |
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37 long myExpiry = Time.getAbsoluteTime(myDuration); |
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38 |
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39 boolean myResult; |
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40 |
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41 OID myOID = ((SpaceNotifyUID) aUID).getOID(); |
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42 |
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43 DiskTxn myTxn = DiskTxn.newTxn(); |
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44 |
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45 try { |
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46 myResult = EventQueue.get().renew(myOID, myExpiry); |
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47 } finally { |
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48 myTxn.commit(); |
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49 } |
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50 |
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51 if (!myResult) |
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52 throw new UnknownLeaseException(); |
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53 |
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54 log(new LeaseRenewal(myOID, myExpiry)); |
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55 |
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56 return myDuration; |
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57 } |
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58 |
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59 public void cancel(SpaceUID aUID) |
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60 throws UnknownLeaseException, IOException { |
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61 |
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62 boolean myResult; |
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63 |
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64 OID myOID = ((SpaceNotifyUID) aUID).getOID(); |
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65 |
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66 DiskTxn myTxn = DiskTxn.newTxn(); |
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67 |
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68 try { |
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69 myResult = EventQueue.get().cancel(myOID); |
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70 } finally { |
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71 myTxn.commit(); |
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72 } |
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73 |
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74 if (!myResult) |
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75 throw new UnknownLeaseException(); |
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76 |
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77 log(new LeaseCancel(myOID)); |
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78 } |
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79 |
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80 private void log(TxnOp anAction) throws IOException { |
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81 try { |
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82 TxnManager.get().log(anAction); |
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83 } catch (TransactionException aTE) { |
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84 throw new IOException("Failed to log action"); |
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85 } |
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86 } |
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87 |
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88 private static final class LeaseRenewal implements TxnOp { |
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89 |
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90 private OID theOID; |
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91 private long theExpiry; |
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92 |
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93 LeaseRenewal(OID aOID, long anExpiry) { |
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94 theOID = aOID; |
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95 theExpiry = anExpiry; |
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96 } |
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97 |
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98 public void restore(TxnState aState) throws IOException { |
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99 EventQueue myQueue = EventQueue.get(); |
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100 |
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101 DiskTxn myTxn = DiskTxn.newTxn(); |
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102 |
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103 try { |
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104 myQueue.renew(theOID, theExpiry); |
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105 } catch (IOException anIOE) { |
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106 } finally { |
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107 myTxn.commit(); |
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108 } |
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109 } |
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110 |
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111 public void commit(TxnState aState) throws IOException { |
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112 // Nothing to do - already applied |
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113 } |
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114 |
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115 public void abort(TxnState aState) throws IOException { |
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116 // Nothing to do - already applied |
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117 } |
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118 |
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119 public String toString() { |
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120 return " NR : " + theOID + " : " + theExpiry; |
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121 } |
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122 } |
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123 |
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124 private static final class LeaseCancel implements TxnOp { |
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125 private OID theOID; |
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126 |
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127 LeaseCancel(OID aOID) { |
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128 theOID = aOID; |
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129 } |
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130 |
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131 public void restore(TxnState aState) throws IOException { |
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132 EventQueue myQueue = EventQueue.get(); |
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133 |
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134 DiskTxn myTxn = DiskTxn.newTxn(); |
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135 |
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136 try { |
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137 myQueue.cancel(theOID); |
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138 } catch (IOException anIOE) { |
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139 } finally { |
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140 myTxn.commit(); |
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141 } |
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142 } |
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143 |
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144 public void commit(TxnState aState) throws IOException { |
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145 // Nothing to do - already applied |
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146 } |
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147 |
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148 public void abort(TxnState aState) throws IOException { |
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149 // Nothing to do - already applied |
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150 } |
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151 |
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152 public String toString() { |
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153 return " NC : " + theOID; |
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154 } |
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155 } |
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156 |
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157 private static final class LogTask implements Task { |
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158 private TxnOp theAction; |
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159 |
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160 LogTask(TxnOp anAction) { |
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161 theAction = anAction; |
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162 } |
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163 |
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164 public void run() { |
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165 try { |
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166 TxnManager.get().log(theAction); |
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167 } catch (Exception anException) { |
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168 EventQueue.theLogger.log(Level.SEVERE, |
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169 "Failed to log lease action", |
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170 anException); |
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171 } |
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172 } |
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173 } |
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174 } |