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From "Yves (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1376) @GeneratedValue allocationSize incorrect implementation
Date Wed, 04 Nov 2009 23:49:32 GMT
@GeneratedValue allocationSize incorrect implementation
-------------------------------------------------------

                 Key: OPENJPA-1376
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1376
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 2.0.0-M3, 1.2.1
         Environment: All
            Reporter: Yves
            Priority: Critical


OpenJpa use allocationSize parameter on NativeJDBCSeq to set the sequence cache value.

But one "JSR 220: Enterprise JavaBeansTM,Version 3.0" , the allocationSize is : "The amount
to increment by when allocating sequence
numbers from the sequence."

Allocating is used to limit the number of access to the sequence or table not to set the sequence
cache value !

If allocationSize=50, the sequence need to be call one time on each 50 call on AbstractJDBCSeq.next().

1 call on AbstractJDBCSeq.next(). call the sequence or table 
2 call : return previous value + 1;
3 call : return previous value + 2;
...
51 call :re-call the sequence
52 return previous value + 1
...






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