PoolUtils.checkMinIdle

Periodically check the idle object count for the pool. At most one idle object will be added per period. If there is an exception when calling {@link ObjectPool#addObject()} then no more checks will be performed.

@param pool the pool to check periodically. @param minIdle if the {@link ObjectPool#getNumIdle()} is less than this then add an idle object. @param period the frequency to check the number of idle objects in a pool, see {@link Timer#schedule(TimerTask, long, long)}. @param <T> the type of objects in the pool @return the {@link TimerTask} that will periodically check the pools idle object count. @throws IllegalArgumentException when <code>pool</code> is <code>null</code> or when <code>minIdle</code> is negative or when <code>period</code> isn't valid for {@link Timer#schedule(TimerTask, long, long)}