Mercurial > hg > blitz_condensed

annotate src/org/dancres/blitz/txn/PersistentPersonality.java @ 32:a77f0a9ed93c 2.1.1

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Add support for optimistic log batching.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:42:31 +0100
parents 4580bb12db30
children
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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.prevayler.implementation.SnapshotPrevayler;
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6 import org.prevayler.implementation.PrevaylerCore;
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8 import org.prevayler.PrevalentSystem;
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10 import org.dancres.blitz.config.Persistent;
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12 import org.dancres.blitz.disk.Disk;
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14 import org.dancres.blitz.txn.batch.*;
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16 /**
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17 Understands how to translate Persistent into core component configuration.
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19 @see org.dancres.blitz.config.Persistent
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20 */
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21 class PersistentPersonality implements StoragePersonality {
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22 private Persistent theModel;
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23 private String theLogDir;
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25 PersistentPersonality(Persistent aModel, String aLogDir) {
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26 theModel = aModel;
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27 theLogDir = aLogDir;
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29 TxnManager.theLogger.log(Level.INFO, "PersistentPersonality");
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30 TxnManager.theLogger.log(Level.INFO, "Max logs before sync: " +
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31 theModel.getMaxLogsBeforeSync());
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32 TxnManager.theLogger.log(Level.INFO, "Reset log stream: " +
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33 theModel.shouldResetLogStream());
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34 TxnManager.theLogger.log(Level.INFO, "Write barrier window: " +
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35 theModel.getBatchWriteWindowSizeMs() + ", " + theModel.getBatchWriteWindowSizeNs());
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37 if (!theModel.dontUseExperimentalBatcher())
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38 TxnManager.theLogger.log(Level.INFO,
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39 "*** Experimental batcher enabled ***");
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41 if (theModel.shouldCleanLogs()) {
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42 TxnManager.theLogger.log(Level.WARNING,
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43 "*** Automatically cleaning logs *** [EXPERIMENTAL]");
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44 }
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45
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46 Disk.init();
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47 }
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48
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49 public CheckpointTrigger getCheckpointTrigger(Checkpointer aCheckpointer) {
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50 return
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51 new OpCountingCheckpointTrigger(aCheckpointer,
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52 theModel.getMaxLogsBeforeSync());
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53 }
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54
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55 public SnapshotPrevayler getPrevayler(PrevalentSystem aSystem)
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56 throws Exception {
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57
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58 PersistentReboot myReboot = new PersistentReboot(theModel);
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59 myReboot.execute();
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61 PrevaylerCore myPrevayler =
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62 new PrevaylerCore(aSystem,
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63 theLogDir,
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64 theModel.shouldResetLogStream(),
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65 theModel.shouldCleanLogs(),
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66 theModel.getLogBufferSize());
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67
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68 if ((theModel.getBatchWriteWindowSizeMs() != 0) ||
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69 (theModel.getBatchWriteWindowSizeNs() != 0)) {
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70 long myWindowSizeMs = theModel.getBatchWriteWindowSizeMs();
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71 int myWindowSizeNs = theModel.getBatchWriteWindowSizeNs();
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73 if (theModel.dontUseExperimentalBatcher()) {
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74 return new ConcurrentWriteBatcher(myPrevayler, myWindowSizeMs, myWindowSizeNs);
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75 } else {
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76 return new OptimisticBatcher(myPrevayler);
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77 }
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78 } else
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79 return new NullBatcher(myPrevayler);
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80 }
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81
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82 public void destroy() {
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83 Disk.destroy();
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84 Disk.clean(theLogDir);
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85 }
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86 }