Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/notify/NotifyLeaseHandlerImpl.java @ 0:3dc0c5604566

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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
parents
children
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0
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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 }