Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txn/PersistentReboot.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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1 package org.dancres.blitz.txn; |
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2 |
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3 import java.util.logging.Level; |
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4 |
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5 import org.dancres.blitz.meta.Registry; |
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6 import org.dancres.blitz.meta.RegistryFactory; |
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7 |
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8 import org.dancres.blitz.config.PersistentBase; |
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9 |
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10 import org.dancres.blitz.BootContext; |
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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 /** |
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15 Certain steps need to be carried out as part of a reboot of a persistent |
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16 (normal or time-barrier) instance of Blitz. Those steps are the |
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17 responsibility of this class. |
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18 */ |
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19 class PersistentReboot { |
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20 private static final String BOOT_STATE = "BootState"; |
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21 |
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22 private static final byte[] MAX_LOGS_KEY = {0x00, 0x00, 0x00, 0x01}; |
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23 |
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24 private PersistentBase theBaseStorageModel; |
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25 |
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26 PersistentReboot(PersistentBase aBaseModel) { |
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27 theBaseStorageModel = aBaseModel; |
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28 } |
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29 |
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30 public void execute() throws Exception { |
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31 int myCurrentMaxLogsBeforeSync = |
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32 theBaseStorageModel.getMaxLogsBeforeSync(); |
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33 |
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34 Registry myRegistry = RegistryFactory.get(BOOT_STATE, null); |
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35 |
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36 UnsyncdOps myBarrier = null; |
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37 |
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38 // Recover the old barrier information and use that for BootContext |
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39 // |
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40 DiskTxn myTxn = DiskTxn.newTxn(); |
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41 |
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42 try { |
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43 myBarrier = (UnsyncdOps) |
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44 myRegistry.getAccessor().load(MAX_LOGS_KEY); |
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45 |
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46 if (myBarrier != null) { |
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47 TxnManager.theLogger.log(Level.INFO, |
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48 "Restoring UnsyncdOps state: " + |
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49 myBarrier.getOpsSinceLastCheckpoint()); |
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50 |
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51 BootContext.add(myBarrier); |
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52 } |
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53 } finally { |
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54 myTxn.commit(); |
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55 } |
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56 |
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57 // Update recovery barrier - this can only ever increase, we can't |
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58 // decrease it due to recovery constraints |
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59 // |
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60 if ((myBarrier == null) || |
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61 (myCurrentMaxLogsBeforeSync > |
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62 myBarrier.getOpsSinceLastCheckpoint())) { |
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63 |
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64 // System.err.println("Updating UnsyncdOps to: " + |
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65 // myCurrentMaxLogsBeforeSync); |
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66 |
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67 myTxn = DiskTxn.newTxn(); |
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68 |
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69 try { |
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70 myRegistry.getAccessor().save(MAX_LOGS_KEY, |
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71 new UnsyncdOps(myCurrentMaxLogsBeforeSync)); |
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72 } finally { |
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73 myTxn.commit(); |
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74 } |
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75 } |
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76 |
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77 myRegistry.close(); |
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78 } |
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79 } |