lang/cs/Org.Apache.REEF.IMRU/API/IMapFunction.cs

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namespace Org.Apache.REEF.IMRU.API
{
    /// <summary>
    /// Interface to be implemented by Map functions in IMRU.
    /// </summary>
    /// <remarks>
    /// Objects of this type are stateful in the sense that the Map function will be called many times, and state can be
    /// kept in instance variables in between these invocations.
    /// The data the map is performed on is assumed to be passed in as a constructor parameter.
    /// </remarks>
    /// <typeparam name="TMapInput">The type of the side information provided to the Map function</typeparam>
    /// <typeparam name="TMapOutput">The return type of the Map function</typeparam>
    public interface IMapFunction<in TMapInput, out TMapOutput>
    {
        /// <summary>
        /// Computes new output based on the given side information and data.
        /// </summary>
        /// <param name="mapInput">Can't be null.</param>
        /// <returns>The output of this map round. Can't be null.</returns>
        TMapOutput Map(TMapInput mapInput);
    }
}