Please use
if (log.isDebugEnabled())
{
log.debug("my expensive to construct message");
}
If you set
protected boolean debug;
somewhere in your code
debug = log.isDebugEnabled()
you gain an infinitesimal amount of time and provide many opportunities for people to
break up to date logging by not resetting debug often enough.
The time consuming part of logging is constructing the message. Checking the
isxxxEnabled is almost free. (log4j reports <50 ns on a slow machine) Lets always do
it the same way to minimize confusion.
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