On Jun 15, 2009, at 9:32 AM, Christopher Schultz wrote:
On 6/14/2009 5:43 PM, David Blevins wrote:
Regardless of that choice we
will still handle sychronization of instantiation, so
double-check-locking or other things will not be necessary.
NB: DCL does not work in Java. Period.
http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
There are cases where you /can/ make it work, but let's face it: most
programmers simple cannot be trusted to do it properly. Also, the
techniques are very sensitive to JVM level, etc. so you'd need to
have a
different implementation depending on which JVM you were running. Yuk.
Chris, I was referring to the EJB 3.1 Singleton bean type which would
free him up from having to write that complicated code you mention.
-David
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