Knut Anders Hatlen created DERBY-5873:
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Summary: Avoid unnecessary allocation of Number instances in
client/server
Key: DERBY-5873
URL: https://issues.apache.org/jira/browse/DERBY-5873
Project: Derby
Issue Type: Improvement
Components: Network Client, Network Server
Affects Versions: 10.10.0.0
Reporter: Knut Anders Hatlen
Assignee: Knut Anders Hatlen
Java 5 introduced some new static factory methods (called valueOf()) in the
Number sub-classes, to be used in preference of the constructors unless a fresh
instance is required. The valueOf() methods are allowed to cache and reuse
objects, possibly reducing the allocation/gc cost and the memory footprint. For
example, Integer.valueOf(int) uses a pre-allocated cache for values between
-128 and +127 by default (the cache size can be tuned with JVM flags).
Now that the server and client code is compiled against Java 5 libraries, we
should use the valueOf() methods to get those benefits. Note also that Java 5
auto-boxing of numbers uses these methods implicitly, so in many cases we can
just remove the calls to the constructor and the compiler will automatically
insert the calls for us.
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