Mercurial > hg > blitz_condensed

annotate src/org/dancres/blitz/meta/MetaIteratorImpl.java @ 9:e92d83b192bb

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Remove some dead code (Dave Brosius)
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 23 May 2009 11:28:57 +0100
parents 3dc0c5604566
children
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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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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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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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e92d83b192bb Remove some dead code (Dave Brosius)
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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 }