[jira] [Created] (FLINK-5012) Provide Timestamp in TimelyFlatMapFunction

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-5012:
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             Summary: Provide Timestamp in TimelyFlatMapFunction
                 Key: FLINK-5012
                 URL: https://issues.apache.org/jira/browse/FLINK-5012
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek


Right now, {{TimelyFlatMapFunction}} does not give the timestamp of the element in {{flatMap()}}.

The signature is currently this:
{code}
void flatMap(I value, TimerService timerService, Collector<O> out) throws Exception;
{code}

if we add the timestamp it would become this:
{code}
void flatMap(I value, Long timestamp, TimerService timerService, Collector<O> out) throws Exception;
{code}

The reason why it's a {{Long}} and not a {{long}} is that an element might not have a timestamp, in that case we should hand in {{null}} here.

This is becoming quite look so we could add a {{Context}} parameter that provides access to the timestamp and timer service.





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