Flink CEP: can't process PatternStream (v 1.12, EventTime mode)

Posted by Maminspapin on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-CEP-can-t-process-PatternStream-v-1-12-EventTime-mode-tp41736.html

Hello,
 
I’ve already asked the question today and got the solve: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Flink-CEP-can-t-process-PatternStream-td41722.html, and it’s clean for me how PatternStream works with ProcessTime.
 
But I need help again, I can’t write proper code to execute PatternStream with EventTime regime.
I think the problem is how I assign the watermark strategy.
 
My code is below, version of Flink is 1.12:
 

public class Main {

 

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

 

        Properties properties = new Properties();

        properties.put("group.id", "Flink");

        properties.put("bootstrap.servers", "broker:9092");

 

 

        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

 

        FlinkKafkaConsumer<String> consumer = new FlinkKafkaConsumer<>(

                "test",

                new SimpleStringSchema(),

                properties);

 

        DataStream<String> stream = env

                .addSource(consumer)

                .map((MapFunction<String, String>) s -> {

                    // Just getting an object model

                    return model.toString();

                }).assignTimestampsAndWatermarks(WatermarkStrategy.<String>forBoundedOutOfOrderness(Duration.ofSeconds(20))

                        .withTimestampAssigner((event, timestamp) -> {

                            Model model = new Gson().fromJson(event, Model.class);

                            return model.getServerTime();

                        }));

 

        stream.print("Stream");

 

 

 

        Pattern<String, String> firstPattern = Pattern

                .<String>begin("first")

                .where(new IterativeCondition<String>() {

                    @Override

                    public boolean filter(String s, Context<String> context) throws Exception {

                        return s.contains("Start");

                    }

                });

 

        DataStream<String> result = CEP

                .pattern(stream, firstPattern)

                .inEventTime() // default TimeCharacteristic for 1.12

                .process(new PatternProcessFunction<String, String>() {

                    @Override

                    public void processMatch(Map<String, List<String>> map, Context context, Collector<String> collector) throws Exception {

                        collector.collect(map.get("first").get(0));

                    }

                });

 

        result.print("Result");

 

        env.execute();

    }

 

}

 
Please, help me to correct the code )
 
Thanks,Yuri L.