Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/EntryLeaseHandlerImpl.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz; |
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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.entry.EntryRepositoryFactory; |
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19 import org.dancres.blitz.entry.EntryRepository; |
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20 |
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21 import org.dancres.blitz.txn.TxnId; |
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22 import org.dancres.blitz.txn.TxnOp; |
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23 import org.dancres.blitz.txn.TxnState; |
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24 import org.dancres.blitz.txn.TxnManager; |
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25 |
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26 import org.dancres.blitz.txnlock.*; |
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27 |
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28 import org.dancres.blitz.task.Task; |
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29 |
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30 import org.dancres.blitz.oid.OID; |
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31 |
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32 import org.dancres.blitz.util.Time; |
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33 |
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34 public class EntryLeaseHandlerImpl implements LeaseHandler { |
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35 public boolean recognizes(SpaceUID aUID) { |
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36 return (aUID instanceof SpaceEntryUID); |
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37 } |
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38 |
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39 public long renew(SpaceUID aUID, long aLeaseDuration) |
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40 throws UnknownLeaseException, LeaseDeniedException, IOException { |
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41 |
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42 long myDuration = LeaseBounds.boundWrite(aLeaseDuration); |
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43 long myExpiry = Time.getAbsoluteTime(myDuration); |
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44 |
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45 boolean myResult; |
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46 |
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47 String myType = ((SpaceEntryUID) aUID).getType(); |
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48 OID myOID = ((SpaceEntryUID) aUID).getOID(); |
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49 |
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50 DiskTxn myTxn = DiskTxn.newTxn(); |
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51 |
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52 try { |
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53 myResult = |
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54 EntryRepositoryFactory.get().find(myType).renew(myOID, |
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55 myExpiry); |
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56 } finally { |
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57 myTxn.commit(); |
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58 } |
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59 |
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60 if (!myResult) |
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61 throw new UnknownLeaseException(); |
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62 |
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63 LeaseRenewal myRenewal = new LeaseRenewal(myType, myOID, myExpiry); |
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64 |
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65 // Now figure out when we're gonna log this change |
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66 LockMgr myMgr = TxnLocks.getLockMgr(myType); |
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67 TxnLock myLock = myMgr.getLock(myOID); |
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68 TxnId myWriter = null; |
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69 |
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70 synchronized(myLock) { |
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71 myWriter = myLock.getWriter(); |
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72 } |
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73 |
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74 /* |
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75 If there is a writer present, the lease renewal should only be issued |
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76 on completion of the associated transaction. |
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77 |
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78 This ordering is critical for correct recovery. If we immediately |
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79 write the lease renewal it will appear in the logs before the |
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80 transaction that write's the Entry. Thus, if the Entry was never |
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81 flushed to disk, it won't be present in the cache and the lease |
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82 renewal will fail whilst apparently having succeeded from the user's |
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83 perspective. |
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84 */ |
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85 if (myWriter == null) { |
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86 log(myRenewal); |
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87 } else { |
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88 TxnState myState = null; |
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89 |
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90 try { |
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91 myState = TxnManager.get().getTxnFor(myWriter); |
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92 } catch (Exception anE) { |
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93 /* |
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94 It's either UnknownTransaction or Remote - in this case |
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95 as there's a writer, it can't be Remote so it can only be |
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96 UnknownTransaction which means the transaction completed |
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97 before we tag the lease renewal onto it. |
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98 */ |
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99 } |
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100 |
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101 if (myState == null) { |
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102 // Too late, transaction is gone |
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103 log(myRenewal); |
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104 } else { |
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105 try { |
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106 myState.add(myRenewal); |
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107 } catch (TransactionException aTE) { |
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108 // Couldn't tag it onto the transaction - must have |
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109 // resolved |
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110 log(myRenewal); |
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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 return myDuration; |
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116 } |
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117 |
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118 public void cancel(SpaceUID aUID) |
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119 throws UnknownLeaseException, IOException { |
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120 |
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121 boolean myResult; |
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122 |
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123 String myType = ((SpaceEntryUID) aUID).getType(); |
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124 OID myOID = ((SpaceEntryUID) aUID).getOID(); |
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125 |
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126 DiskTxn myTxn = DiskTxn.newTxn(); |
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127 |
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128 try { |
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129 myResult = |
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130 EntryRepositoryFactory.get().find(myType).cancel(myOID); |
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131 } finally { |
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132 myTxn.commit(); |
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133 } |
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134 |
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135 if (!myResult) |
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136 throw new UnknownLeaseException(); |
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137 |
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138 LeaseCancel myCancel = new LeaseCancel(myType, myOID); |
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139 |
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140 // Now figure out when we're gonna log this change |
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141 LockMgr myMgr = TxnLocks.getLockMgr(myType); |
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142 TxnLock myLock = myMgr.getLock(myOID); |
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143 TxnId myWriter = null; |
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144 |
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145 synchronized(myLock) { |
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146 myWriter = myLock.getWriter(); |
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147 } |
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148 |
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149 /* |
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150 If there is a writer present, the lease cancel should only be issued |
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151 on completion of the associated transaction. |
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152 |
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153 This ordering is critical for correct recovery. If we immediately |
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154 write the lease cancel it will appear in the logs before the |
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155 transaction that write's the Entry. Thus, if the Entry was never |
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156 flushed to disk, it won't be present in the cache and the lease |
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157 cancel will fail whilst apparently having succeeded from the user's |
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158 perspective. |
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159 */ |
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160 if (myWriter == null) { |
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161 log(myCancel); |
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162 } else { |
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163 TxnState myState = null; |
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164 |
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165 try { |
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166 myState = TxnManager.get().getTxnFor(myWriter); |
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167 } catch (Exception anE) { |
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168 /* |
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169 It's either UnknownTransaction or Remote - in this case |
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170 as there's a writer, it can't be Remote so it can only be |
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171 UnknownTransaction which means the transaction completed |
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172 before we tag the lease cancel onto it. |
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173 */ |
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174 } |
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175 |
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176 if (myState == null) { |
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177 // Too late, transaction is gone |
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178 log(myCancel); |
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179 } else { |
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180 try { |
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181 myState.add(myCancel); |
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182 } catch (TransactionException aTE) { |
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183 // Couldn't tag it onto the transaction - must have |
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184 // resolved |
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185 log(myCancel); |
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186 } |
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187 } |
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188 } |
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189 } |
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190 |
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191 private void log(TxnOp anAction) throws IOException { |
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192 try { |
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193 TxnManager.get().log(anAction); |
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194 } catch (TransactionException aTE) { |
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195 throw new IOException("Failed to log action"); |
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196 } |
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197 } |
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198 |
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199 private static final class LeaseRenewal implements TxnOp { |
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200 |
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201 private String theType; |
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202 private OID theOID; |
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203 private long theExpiry; |
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204 |
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205 LeaseRenewal(String aType, OID aOID, long anExpiry) { |
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206 theType = aType; |
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207 theOID = aOID; |
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208 theExpiry = anExpiry; |
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209 } |
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210 |
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211 public void restore(TxnState aState) throws IOException { |
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212 EntryRepository myRepos = |
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213 EntryRepositoryFactory.get().get(theType); |
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214 |
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215 DiskTxn myTxn = DiskTxn.newTxn(); |
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216 |
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217 try { |
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218 myRepos.renew(theOID, theExpiry); |
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219 } catch (IOException anIOE) { |
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220 } finally { |
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221 myTxn.commit(); |
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222 } |
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223 } |
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224 |
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225 public void commit(TxnState aState) throws IOException { |
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226 // Nothing to do - already applied |
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227 } |
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228 |
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229 public void abort(TxnState aState) throws IOException { |
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230 // Never called |
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231 } |
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232 |
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233 public String toString() { |
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234 return " ER : " + theType + " : " + theOID + " : " + theExpiry; |
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235 } |
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236 } |
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237 |
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238 private static final class LeaseCancel implements TxnOp { |
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239 private String theType; |
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240 private OID theOID; |
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241 |
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242 LeaseCancel(String aType, OID aOID) { |
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243 theType = aType; |
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244 theOID = aOID; |
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245 } |
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246 |
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247 public void restore(TxnState aState) throws IOException { |
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248 EntryRepository myRepos = |
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249 EntryRepositoryFactory.get().get(theType); |
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250 |
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251 DiskTxn myTxn = DiskTxn.newTxn(); |
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252 |
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253 try { |
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254 myRepos.cancel(theOID); |
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255 } catch (IOException anIOE) { |
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256 } finally { |
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257 myTxn.commit(); |
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258 } |
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259 } |
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260 |
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261 public void commit(TxnState aState) throws IOException { |
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262 // Nothing to do - already applied |
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263 } |
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264 |
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265 public void abort(TxnState aState) throws IOException { |
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266 // Never called |
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267 } |
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268 |
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269 public String toString() { |
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270 return " EC : " + theType + " : " + theOID; |
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271 } |
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272 } |
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273 |
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274 private static final class LogTask implements Task { |
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275 private TxnOp theAction; |
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276 |
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277 LogTask(TxnOp anAction) { |
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278 theAction = anAction; |
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279 } |
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280 |
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281 public void run() { |
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282 try { |
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283 TxnManager.get().log(theAction); |
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284 } catch (Exception anException) { |
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285 SpaceImpl.theLogger.log(Level.SEVERE, |
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286 "Failed to log lease action", |
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287 anException); |
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288 } |
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289 } |
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290 } |
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291 } |