Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4320#discussion_r132446221
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/PatternStream.java
---
@@ -213,14 +321,97 @@
* @return {@link DataStream} which contains the resulting elements
from the pattern flat select
* function.
*/
- public <R> SingleOutputStreamOperator<R> flatSelect(final
PatternFlatSelectFunction<T, R> patternFlatSelectFunction, TypeInformation<R>
outTypeInfo) {
- SingleOutputStreamOperator<Map<String, List<T>>> patternStream =
-
CEPOperatorUtils.createPatternStream(inputStream, pattern);
-
- return patternStream.flatMap(
- new PatternFlatSelectMapper<>(
-
patternStream.getExecutionEnvironment().clean(patternFlatSelectFunction)
- )).returns(outTypeInfo);
+ public <R> SingleOutputStreamOperator<R> flatSelect(
+ final PatternFlatSelectFunction<T, R>
patternFlatSelectFunction,
+ final TypeInformation<R> outTypeInfo) {
+ return CEPOperatorUtils.createPatternStream(
+ inputStream,
+ pattern,
+ clean(patternFlatSelectFunction),
+ outTypeInfo);
+ }
+
+ /**
+ * Applies a flat select function to the detected pattern sequence. For
each pattern sequence the
+ * provided {@link PatternFlatSelectFunction} is called. The pattern
select function can produce
+ * exactly one resulting element.
+ *
+ * <p>Applies a timeout function to a partial pattern sequence which
has timed out. For each
+ * partial pattern sequence the provided {@link
PatternFlatTimeoutFunction} is called. The pattern
+ * timeout function can produce exactly one resulting element.
+ *
+ * <p>You can get the stream of late data using
+ * {@link SingleOutputStreamOperator#getSideOutput(OutputTag)} on the
+ * {@link SingleOutputStreamOperator} resulting from the select
operation
+ * with the same {@link OutputTag}.
+ *
+ * @param timeoutOutputTag {@link OutputTag} that identifies side
output with timeouted patterns
+ * @param patternFlatTimeoutFunction The pattern timeout function which
is called for each partial
+ * pattern sequence which has timed out.
+ * @param patternFlatSelectFunction The pattern select function which
is called for each detected
+ * pattern sequence.
+ * @param <L> Type of the resulting timeout elements
+ * @param <R> Type of the resulting elements
+ * @return {@link DataStream} which contains the resulting elements
with the resulting timeout
+ * elements in a side output.
+ */
+ public <L, R> SingleOutputStreamOperator<R> flatSelect(
+ final OutputTag<L> timeoutOutputTag,
+ final PatternFlatTimeoutFunction<T, L>
patternFlatTimeoutFunction,
+ final PatternFlatSelectFunction<T, R>
patternFlatSelectFunction) {
+
+ TypeInformation<R> rightTypeInfo =
TypeExtractor.getUnaryOperatorReturnType(
+ patternFlatSelectFunction,
+ PatternFlatSelectFunction.class,
+ 0,
+ 1,
+ new int[]{0, 1, 0},
+ new int[]{1, 0},
+ inputStream.getType(),
+ null,
+ false);
+
+ return flatSelect(timeoutOutputTag, patternFlatTimeoutFunction,
rightTypeInfo, patternFlatSelectFunction);
+ }
+
+ /**
+ * Applies a flat select function to the detected pattern sequence. For
each pattern sequence the
+ * provided {@link PatternFlatSelectFunction} is called. The pattern
select function can produce
+ * exactly one resulting element.
+ *
+ * <p>Applies a timeout function to a partial pattern sequence which
has timed out. For each
+ * partial pattern sequence the provided {@link
PatternFlatTimeoutFunction} is called. The pattern
+ * timeout function can produce exactly one resulting element.
+ *
+ * <p>You can get the stream of late data using
--- End diff --
Same as above.
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