Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/ExpiredLocatorImpl.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 |
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15 /** |
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16 TupleLocator implementation to be used on Lease tables. See LeaseTrackerImpl |
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17 for information on the database format. |
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18 */ |
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19 class ExpiredLocatorImpl implements TupleLocator { |
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20 private Cursor theCursor; |
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21 private boolean isFirst = true; |
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22 |
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23 private DatabaseEntry theLeaseRecord; |
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24 private DatabaseEntry theLeaseBucket; |
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25 |
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26 private long theScanTime; |
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27 |
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28 /** |
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29 @param aCursor the cursor to use for iteration |
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30 */ |
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31 ExpiredLocatorImpl(Cursor aCursor) { |
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32 theCursor = aCursor; |
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33 theScanTime = System.currentTimeMillis(); |
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34 theLeaseBucket = new DatabaseEntry(); |
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35 } |
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36 |
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37 /** |
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38 Invoke this to load the next matching Tuple. |
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39 |
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40 @return <code>true</code> if there was a tuple, <code>false</code> |
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41 otherwise |
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42 */ |
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43 public boolean fetchNext() throws IOException { |
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44 /* |
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45 The cursor will have been initialised whilst we decided which |
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46 field was best to search on which means it will already be pointed |
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47 at the first record so we must handle this case specially. |
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48 */ |
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49 if (isFirst) { |
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50 isFirst = false; |
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51 |
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52 return loadNext(); |
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53 } else { |
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54 return loadNextMove(); |
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55 } |
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56 } |
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57 |
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58 private boolean loadNextMove() throws IOException { |
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59 return loadNext(true); |
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60 } |
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61 |
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62 private boolean loadNext() throws IOException { |
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63 return loadNext(false); |
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64 } |
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65 |
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66 private boolean loadNext(boolean advance) throws IOException { |
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67 OperationStatus myResult; |
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68 |
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69 try { |
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70 theLeaseRecord = new DatabaseEntry(); |
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71 |
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72 if (advance) |
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73 myResult = theCursor.getNextDup(theLeaseBucket, theLeaseRecord, |
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74 null); |
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75 else |
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76 myResult = theCursor.getFirst(theLeaseBucket, theLeaseRecord, |
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77 null); |
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78 } catch (DatabaseException aDbe) { |
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79 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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80 throw new IOException("Dbe"); |
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81 } |
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82 |
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83 if ((myResult.equals(OperationStatus.NOTFOUND)) || |
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84 (theScanTime < |
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85 LeaseRecordUtils.unpackExpiry(theLeaseRecord.getData()))) { |
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86 |
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87 if (myResult != OperationStatus.NOTFOUND) |
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88 // System.err.println("Exceeding Expiry: " + |
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89 // LeaseRecordUtils.unpackExpiry(theLeaseRecord.getData())); |
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90 |
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91 // Try for the next non-dupe |
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92 theLeaseRecord = new DatabaseEntry(); |
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93 |
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94 try { |
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95 // System.err.println("Skipping to next bucket"); |
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96 |
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97 myResult = |
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98 theCursor.getNextNoDup(theLeaseBucket, theLeaseRecord, null); |
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99 |
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100 if (myResult.equals(OperationStatus.SUCCESS)) |
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101 return true; |
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102 } catch (DatabaseException aDbe) { |
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103 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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104 throw new IOException("Dbe"); |
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105 } |
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106 |
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107 return false; |
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108 } else { |
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109 // System.err.println("Maybe expiring one: " + |
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110 // LeaseRecordUtils.unpackExpiry(theLeaseRecord.getData())); |
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111 return true; |
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112 } |
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113 } |
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114 |
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115 /** |
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116 @return the OID of the tuple just fetched with |
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117 <code>fetchNext</code> |
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118 */ |
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119 public OID getOID() { |
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120 OID myResult = |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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121 OIDFactory.newOID( |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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122 LeaseRecordUtils.unpackId(theLeaseRecord.getData())); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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123 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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124 // System.err.println("Time is up for: " + myResult); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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125 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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126 return myResult; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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127 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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128 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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129 /** |
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Dan Creswell <dan.creswell@gmail.com>
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130 When you've finished with the TupleLocator instance, call release. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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131 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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132 public void release() throws IOException { |
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133 try { |
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134 theCursor.close(); |
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135 } catch (DatabaseException aDbe) { |
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136 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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137 throw new IOException("Dbe"); |
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Dan Creswell <dan.creswell@gmail.com>
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138 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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139 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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140 } |