Github user manuzhang commented on a diff in the pull request: https://github.com/apache/incubator-gearpump/pull/131#discussion_r95956985 --- Diff: streaming/src/main/scala/org/apache/gearpump/streaming/dsl/javaapi/functions/FlatMapFunction.scala --- @@ -15,17 +15,18 @@ * See the License for the specific language governing permissions and * limitations under the License. */ +package org.apache.gearpump.streaming.dsl.javaapi.functions -package org.apache.gearpump.streaming.javaapi.dsl.functions; - -import java.io.Serializable; +import org.apache.gearpump.streaming.dsl.scalaapi.functions.SerializableFunction /** - * GroupBy function which assign value of type T to groups + * Transforms one input into zero or more outputs of possibly different types. + * This Java version of FlatMapFunction returns a java.util.Iterator. * - * @param <T> Input value type - * @param <Group> Group Type + * @param T Input value type + * @param R Output value type */ -public interface GroupByFunction<T, Group> extends Serializable { - Group apply(T t); +abstract class FlatMapFunction[T, R] extends SerializableFunction { --- End diff -- it's already under the `javaapi` package.
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