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annotate src/org/dancres/blitz/txn/PersistentReboot.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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 }