title: hikaricp get number of busy connection
body: <p>Like we can get the number of busy connection in c3p0 by using method like <code>dataSource.getNumBusyConnections()</code>, the same way how can we do that in case of hikaricp? Can anyone provide all the related methods between c3p0 and hikaricp? Also what is the destroy (in c3p0) method equivalent in hikaricp?</p>