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Use event time


Hi,

 

I am new to Flink.

 

I have the following small code to use the event time. I did not get the result expected, i.e. it print out events in the order of event time.

 

Did I miss something here?

 

Regards,

 

Min

 

 

--------------Event time------------------

   public static void main(String[] args) throws Exception  {

        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
       
long start =System.currentTimeMillis();
        DataStream<Event> stream = env.fromElements(
new Event(0,start,start),
               
new Event(1,start+10,start+10), new Event(2,start+20,start-20),
               
new Event(3,start+30,start-30), new Event(4,start+40,start-40));

        stream.map(event ->
"RAW order " + event.toString()).print();

        stream.assignTimestampsAndWatermarks(new AscendingTimestampExtractor<Event>() {
            
@Override public long extractAscendingTimestamp(Event element) { return element.time1; } })
                .map(event ->
"time1 order:: " + event.toString()).print();

        stream.assignTimestampsAndWatermarks(new AscendingTimestampExtractor<Event>() {
           
@Override public long extractAscendingTimestamp(Event element) { return element.time2; } })
                .map(event ->
"time2 order:: " + event.toString()).print();

       
env.execute("event time ........");
    }


   
static public class Event {
       
int id;
       
long time1;
       
long time2;

        Event(
int id, long time1, long time2){
           
this.id =id;
           
this.time1=time1;
           
this.time2=time2;
        }

       
public String toString() {
           
return "id=" + id + "; time1=" + time1 + "; time2=" + time2;
        }
    }
}

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