Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/meta/MetaIteratorImpl.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 | e92d83b192bb |
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0
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1 package org.dancres.blitz.meta; |
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2 |
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3 import java.io.IOException; |
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4 import java.io.Serializable; |
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5 |
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6 import java.util.logging.*; |
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7 |
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8 import com.sleepycat.je.Database; |
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9 import com.sleepycat.je.DatabaseEntry; |
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10 import com.sleepycat.je.Cursor; |
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11 import com.sleepycat.je.Transaction; |
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12 import com.sleepycat.je.OperationStatus; |
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13 |
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14 import org.dancres.blitz.disk.DiskTxn; |
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15 |
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16 import org.dancres.util.ObjectTransformer; |
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17 |
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18 class MetaIteratorImpl implements MetaIterator { |
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19 private Database theDb; |
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20 private Cursor theCursor; |
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21 private Transaction theTxn; |
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22 |
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23 MetaIteratorImpl(Database aDb, DiskTxn aTxn) { |
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24 theDb = aDb; |
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25 theTxn = aTxn.getDbTxn(); |
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26 } |
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27 |
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28 public MetaEntry fetch() throws IOException { |
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29 OperationStatus myResult = OperationStatus.NOTFOUND; |
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30 |
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31 DatabaseEntry myKey = new DatabaseEntry(); |
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32 DatabaseEntry myData = new DatabaseEntry(); |
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33 |
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34 try { |
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35 myResult = getCursor().getNext(myKey, myData, null); |
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36 } catch (Exception anE) { |
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37 RegistryImpl.theLogger.log(Level.SEVERE, "Failed to fetch", anE); |
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38 throw new IOException(); |
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39 } |
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40 |
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41 if (myResult.equals(OperationStatus.NOTFOUND)) { |
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42 return null; |
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43 } |
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44 |
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45 try { |
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46 Serializable myObject = ObjectTransformer.toObject(myData.getData()); |
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47 |
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48 return new MetaEntryImpl(myKey.getData(), myObject); |
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49 |
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50 } catch (Exception anException) { |
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51 RegistryImpl.theLogger.log(Level.SEVERE, |
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52 "Failed to read meta data", |
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53 anException); |
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54 |
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55 throw new IOException("Couldn't read meta data"); |
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56 } |
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57 } |
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58 |
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59 public void release() throws IOException { |
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60 try { |
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61 getCursor().close(); |
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62 } catch (Exception anE) { |
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63 RegistryImpl.theLogger.log(Level.SEVERE, "Failed to release", anE); |
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64 throw new IOException(); |
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65 } |
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66 } |
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67 |
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68 private Cursor getCursor() throws IOException { |
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69 try { |
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70 if (theCursor == null) { |
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71 theCursor = theDb.openCursor(theTxn, null); |
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72 } |
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73 |
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74 return theCursor; |
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75 } catch (Exception anE) { |
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76 RegistryImpl.theLogger.log(Level.SEVERE, |
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77 "Failed to getCursor", anE); |
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78 throw new IOException(); |
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79 } |
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80 } |
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81 } |