Flink 系例 之 TimeWindowAll

timeWindowAll時間滾動窗口(不分區時間滾動窗口【滑動窗口與滾動窗口的區別，在於滑動窗口會有數據元素重疊可能，而滾動窗口不存在元素重疊】)

示例環境

java.version: 1.8.x
flink.version: 1.11.1

示例數據源 （項目碼雲下載）

Flink 系例 之 搭建開發環境與數據

TimeWindowAll.java

import com.flink.examples.DataSource;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.RichSourceFunction;
import org.apache.flink.streaming.api.windowing.time.Time;
import java.util.List;

/**
 * @Description 不分區時間滾動窗口
 */
public class TimeWindowAll {

    /*
    窗口在處理流數據時，通常會對流進行分區；
    數據流劃分爲：
    keyed（根據key劃分不同數據流區）
    non-keyed(指沒有按key劃分的數據流區，指所有原始數據流)
    */

    /**
     * 遍歷集合，返回指定時間滾動窗口下最大年齡數據記錄
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        //env.setParallelism(1);
        DataStream<Tuple3<String, String, Integer>> inStream = env.addSource(new MyRichSourceFunction());
        DataStream<Tuple3<String, String, Integer>> dataStream = inStream
                //按時間窗口滑動，對前6秒內的輸入數據流，計算一次
                .timeWindowAll(Time.seconds(6))
                //注意：計算變量爲f2
                .maxBy(2);
        dataStream.print();
        env.execute("flink TimeWindow job");
    }

    /**
     * 模擬數據持續輸出
     */
    public static class MyRichSourceFunction extends RichSourceFunction<Tuple3<String, String, Integer>> {
        @Override
        public void run(SourceContext<Tuple3<String, String, Integer>> ctx) throws Exception {
            List<Tuple3<String, String, Integer>> tuple3List = DataSource.getTuple3ToList();
            for (Tuple3 tuple3 : tuple3List){
                ctx.collect(tuple3);
                //1秒鐘輸出一個
                Thread.sleep(1 * 1000);
            }
        }
        @Override
        public void cancel() {
            try{
                super.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}

打印結果

2> (王五,man,29)