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<a class="user-hover" rel="millerm1" id="email_millerm1" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=millerm1" style="color:#6c797f;">Mark Miller</a>
created <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7932'>HHH-7932</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7932'><strong>OptimizerFactory.PooledOptimizer storing end of next pool in the database instead of the beginning of next pool when using org.hibernate.id.enhanced.TableGenerator </strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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3.6.6 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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17/Jan/13 1:29 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>We noticed that despite what the documentation says for the OptimizerFactory.PooledOptimizer it is storing one past the end of the next pool in the database instead of the beginning of the next pool when used with the org.hibernate.id.enhanced.TableGenerator. Both classes are coded reasonably but they are not consistnet in what they are passing between them with how the PooledOptimizer is documented.</p>
<p style='margin-top:0;margin-bottom:10px;'>Correct me where I may be wrong in this logic but here is how I believe the flow is working:</p>
<p style='margin-top:0;margin-bottom:10px;'>In the doWorkInCurrentTransaction method of org.hibernate.id.enhanced.TableGenerator it reads the value currently in the database and assigns it to the value field at line 501: value.initialize( selectRS, 1 );<br/>
it then copies that value to the updateValue field at line 516 with: final IntegralDataTypeHolder updateValue = value.copy();</p>
<p style='margin-top:0;margin-bottom:10px;'>which is then incremented by the incrementSize at line 518: updateValue.add( incrementSize );</p>
<p style='margin-top:0;margin-bottom:10px;'>That value is then updated back to the database with lines 523-526:<br/>
updateValue.bind( updatePS, 1 );<br/>
value.bind( updatePS, 2 );<br/>
updatePS.setString( 3, segmentValue );<br/>
rows = updatePS.executeUpdate();</p>
<p style='margin-top:0;margin-bottom:10px;'>Then it returns value at line 540: return value;</p>
<p style='margin-top:0;margin-bottom:10px;'>Note it returned value and not updateValue and value is the smaller of the two numbers. So it looks like this class thinks it reserved from value + 1 to hiValue, wrote hiValue (the top of the range it reserved to the database) and then returns value (the bottom of the range it returned).</p>
<p style='margin-top:0;margin-bottom:10px;'>However in the OptimizerFactory$PooledOptimizer class when it makes calls on the callback to getNextValue() which runs the code gone though above it takes the returned value and assignees it to hiValue not to value, and starts giving out numbers from the returned value minus increment size. See lines 434-435:<br/>
hiValue = callback.getNextValue();<br/>
value = hiValue.copy().subtract( incrementSize );</p>
<p style='margin-top:0;margin-bottom:10px;'>This means that when the next pool is needed with an increment size of 10 if the database holds the value 40 then 40 will be fetched and 50 (40 + 10) will be written back to the database and 40 returned to the PooledOptimzer which will set hiValue = 40 and value = 30 (40 -10) and then handout values 30 through 40 before returning to get the next pool. This code will work so long as any other users of the generator sequence treat the stored value in this same way and every user of it uses the same increment size, but it is not consistent with the comments on OptimizerFactory$PooledOptimizer at lines 386-387:</p>
<ul>
<li>Optimizer which uses a pool of values, storing the next low value of the</li>
<li>range in the database.</li>
</ul>
<p style='margin-top:0;margin-bottom:10px;'>Also, this way every user must use the same incrementSize or else trouble is encountered.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Hibernate 3.6.6 using MySQL
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="millerm1" id="email_millerm1" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=millerm1" style="color:#6c797f;">Mark Miller</a>
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