code: private void abortActiveConnections(final ExecutorService assassinExecutor)
     {
        for (PoolEntry poolEntry : connectionBag.values(STATE_IN_USE)) {
           Connection connection = poolEntry.close();
           try {
              connection.abort(assassinExecutor);
           }
           catch (Throwable e) {
              quietlyCloseConnection(connection, "(connection aborted during shutdown)");
           }
           finally {
              connectionBag.remove(poolEntry);
           }
        }
     }
docs: Attempt to abort or close active connections.
  
  @param assassinExecutor the ExecutorService to pass to Connection.abort()