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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