Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/PrimaryLocatorImpl.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.logging.Level; |
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6 |
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7 import com.sleepycat.je.Cursor; |
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8 import com.sleepycat.je.DatabaseEntry; |
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9 import com.sleepycat.je.DatabaseException; |
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10 import com.sleepycat.je.OperationStatus; |
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11 |
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12 import org.dancres.blitz.oid.OID; |
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13 import org.dancres.blitz.oid.OIDFactory; |
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14 import org.dancres.blitz.mangler.MangledEntry; |
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15 |
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16 /** |
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17 TupleLocator implementation to be used on main index file which contains |
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18 oid and entry. |
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19 */ |
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20 class PrimaryLocatorImpl implements TupleLocator { |
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21 private MangledEntry theTemplate; |
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22 private int theReadahead; |
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23 |
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24 private Cursor theCursor; |
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25 private boolean isFirst = true; |
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26 |
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27 private DatabaseEntry theKey; |
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28 private DatabaseEntry theData; |
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29 |
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30 /** |
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31 @param aCursor the cursor to use for iteration |
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32 */ |
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33 PrimaryLocatorImpl(Cursor aCursor, MangledEntry aTemplate, int aReadahead) { |
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34 theCursor = aCursor; |
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35 theTemplate = aTemplate; |
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36 theReadahead = aReadahead; |
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37 } |
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38 |
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39 /** |
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40 Invoke this to load the next matching Tuple. |
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41 |
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42 @return <code>true</code> if there was a tuple, <code>false</code> |
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43 otherwise |
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44 */ |
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45 public boolean fetchNext() throws IOException { |
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46 /* |
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47 The cursor will have been initialised whilst we decided which |
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48 field was best to search on which means it will already be pointed |
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49 at the first record so we must handle this case specially. Note |
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50 that we only get created if the cursor actually contains records so |
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51 we don't need to do any testing here. |
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52 */ |
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53 if (isFirst) { |
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54 loadNext(false); |
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55 |
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56 isFirst = false; |
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57 |
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58 return true; |
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59 } else { |
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60 return loadNext(true); |
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61 } |
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62 } |
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63 |
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64 private boolean loadNext(boolean moveForward) throws IOException { |
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65 OperationStatus myResult; |
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66 |
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67 try { |
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68 theKey = new DatabaseEntry(); |
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69 theData = new DatabaseEntry(); |
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70 |
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71 if (moveForward) |
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72 myResult = theCursor.getNext(theKey, theData, null); |
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73 else |
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74 myResult = theCursor.getCurrent(theKey, theData, null); |
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75 |
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76 } catch (DatabaseException aDbe) { |
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77 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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78 throw new IOException("Dbe"); |
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79 } |
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80 |
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81 return (! myResult.equals(OperationStatus.NOTFOUND)); |
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82 } |
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83 |
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84 /** |
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85 @return the OID of the tuple just fetched with |
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86 <code>fetchNext</code> |
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87 */ |
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88 public OID getOID() { |
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89 OID myResult = OIDFactory.newOID(theKey.getData()); |
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90 |
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91 return myResult; |
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92 } |
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93 |
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94 /** |
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95 When you've finished with the TupleLocator instance, call release. |
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96 */ |
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97 public void release() throws IOException { |
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98 releaseImpl(); |
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99 |
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100 Readahead.get().add(theTemplate, theReadahead); |
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101 } |
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102 |
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103 private void releaseImpl() throws IOException { |
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104 try { |
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105 theCursor.close(); |
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106 } catch (DatabaseException aDbe) { |
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107 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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108 throw new IOException("Dbe"); |
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109 } |
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110 } |
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111 } |