[Mondrian] Double-checked locking

[Julian Hyde]

Most of you probably know that double-checked locking is unsound in Java.
But it bears repeating from time to time, because every Java programmer
writing threadsafe code needs to know it. Please read and digest.
 
http://en.wikipedia.org/wiki/Double-checked_locking
 
According to this article you can use the 'volatile' keyword from JDK 1.5
onwards and eliminate the problem. However, I would stick with the
'synchronize everything' approach unless you have a good reason to do
otherwise.
 
Julian
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