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public interface RichFunction {
    void init(RecordContext recordContext);

    void close();
}
 
public interface ValueMapperWithKey<K, V, VR> {

    /**
     * Map the given value to a new value.
     *
     * @param value the value to be mapped
     * @return the new value
     */
    VR apply(final K key, final V value);
}

 
public interface RichValueMapper<K, V, VR>  extends ValueMapperWithKey<K, V, VR>, RichFunction {

}
 
public interface RichKeyValueMapper<K, V, VR>  extends KeyValueMapper<K, V, VR>, RichFunction {

}