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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-6230) Use the JVM's cache of Number instances in ReuseFactory
Date Tue, 28 May 2013 11:17:20 GMT
Knut Anders Hatlen created DERBY-6230:
-----------------------------------------

             Summary: Use the JVM's cache of Number instances in ReuseFactory
                 Key: DERBY-6230
                 URL: https://issues.apache.org/jira/browse/DERBY-6230
             Project: Derby
          Issue Type: Improvement
          Components: Services
    Affects Versions: 10.11.0.0
            Reporter: Knut Anders Hatlen
            Assignee: Knut Anders Hatlen


ReuseFactory has a cache of Byte, Short, Integer and Long instances to avoid excessive allocation
of such instances.

As of Java 5, the JVM has a cache of its own, available through static valueOf() methods in
these classes.

The JVM's cache is guaranteed to have at least all values in the range [-128, 127]. ReuseFactory
currently caches Integer instances in the range [-1, 18] plus a few special values, and Byte,
Short and Long instances in the range [0, 10].

If we change ReuseFactory so that it uses the JVM's cache, the number of cache misses will
be lower, and the code will become shorter.

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