+ /**
+ * Callback method for read plugins.
+ *
+ * This method is called once every few seconds (depends on the
+ * configuration of the daemon). It is supposed to gather values in
+ * some way and submit them to the daemon using
+ * {@link Collectd#dispatchValues}.
+ *
+ * @return zero when successful, non-zero when an error occurred.
+ * @see Collectd#dispatchValues
+ */
+ public int read ();