Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/5481#discussion_r171234411
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java
---
@@ -321,19 +324,80 @@ private boolean
validateKeyTypeIsHashable(TypeInformation<?> type) {
* @param <R> The type of elements emitted by the {@code
ProcessFunction}.
*
* @return The transformed {@link DataStream}.
+ *
+ * @deprecated Use {@link KeyedStream#process(KeyedProcessFunction,
TypeInformation)}
*/
+ @Deprecated
@Override
@Internal
public <R> SingleOutputStreamOperator<R> process(
ProcessFunction<T, R> processFunction,
TypeInformation<R> outputType) {
- KeyedProcessOperator<KEY, T, R> operator =
- new
KeyedProcessOperator<>(clean(processFunction));
+ LegacyKeyedProcessOperator<K, T, R> operator = new
LegacyKeyedProcessOperator<>(clean(processFunction));
return transform("Process", outputType, operator);
}
+ /**
+ * Applies the given {@link KeyedProcessFunction} on the input stream,
thereby creating a transformed output stream.
+ *
+ * <p>The function will be called for every element in the input
streams and can produce zero
+ * or more output elements. Contrary to the {@link
DataStream#flatMap(FlatMapFunction)}
+ * function, this function can also query the time and set timers. When
reacting to the firing
+ * of set timers the function can directly emit elements and/or
register yet more timers.
+ *
+ * @param keyedProcessFunction The {@link KeyedProcessFunction} that is
called for each element in the stream.
+ *
+ * @param <K> The type of key in {@code KeyedProcessFunction}.
+ *
+ * @param <R> The type of elements emitted by the {@code
KeyedProcessFunction}.
+ *
+ * @return The transformed {@link DataStream}.
+ */
+ @PublicEvolving
+ public <K, R> SingleOutputStreamOperator<R>
process(KeyedProcessFunction<K, T, R> keyedProcessFunction) {
+
+ TypeInformation<R> outType =
TypeExtractor.getUnaryOperatorReturnType(
+ keyedProcessFunction,
+ KeyedProcessFunction.class,
+ 0,
--- End diff --
The indices here are not `0` and `1` for input and output type, but `1` and
`2`. In the process function it was 0 and 1 because we did not have the key.
---
