package org.rrd4j.data;

/**
 * Interface to be used for custom datasources.
 *
 * <p>If you wish to use a custom datasource in a graph, you should create a class implementing this interface
 * that represents that datasource, and then pass this class on to the RrdGraphDef.</p>
 * @since 3.7
 */
@FunctionalInterface
public interface IPlottable {
    /**
     * Retrieves datapoint value based on a given timestamp.
     * Use this method if you only have one series of data in this class.
     *
     * @param timestamp Timestamp in seconds for the datapoint.
     * @return Double value of the datapoint.
     */
    double getValue(long timestamp);
}