|NO.Z.00044|——————————|BigDataEnd|——|Hadoop&Flink.V11|——|Flink.v11|Flink State|状态原理|原理剖析|状态存储|编程实现|

一、编程代码实现

### --- 编程代码实现：broadcastdemo.java

package com.yanqi.state;

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.api.common.state.*;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.BroadcastStream;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.co.KeyedBroadcastProcessFunction;
import org.apache.flink.util.Collector;

public class BroadCastDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(4);
        //两套数据流，1：用户行为   2 ： 模式
        UserAction ac1 = new UserAction( 1001L, "login");
        UserAction ac2 = new UserAction( 1003L, "pay");
        UserAction ac3 = new UserAction( 1002L, "car");
        UserAction ac4 = new UserAction( 1001L, "logout");
        UserAction ac5 = new UserAction( 1003L, "car");
        UserAction ac6 = new UserAction( 1002L, "logout");
        DataStreamSource<UserAction> actions = env.fromElements(ac1, ac2, ac3, ac4, ac5, ac6);

        actions.filter(new FilterFunction<UserAction>() {
            @Override
            public boolean filter(UserAction value) throws Exception {
                return false;
            }
        }).setParallelism(8);

        MyPattern myPattern1 = new MyPattern("login", "logout");
        MyPattern myPattern2 = new MyPattern("car", "logout");
        DataStreamSource<MyPattern> patterns = env.fromElements(myPattern1);

        KeyedStream<UserAction, Long> keyed = actions.keyBy(value -> value.getUserId());


        //将模式流广播到下游的所有算子
        MapStateDescriptor<Void, MyPattern> bcStateDescriptor = new MapStateDescriptor<>("patterns", Types.VOID, Types.POJO(MyPattern.class));
        BroadcastStream<MyPattern> broadcastPatterns = patterns.broadcast(bcStateDescriptor);


        SingleOutputStreamOperator<Tuple2<Long, MyPattern>> process = keyed.connect(broadcastPatterns).process(new PatternEvaluator());



        //将匹配成功的结果输出到控制台
        process.print();
        env.execute();

    }
    public static class PatternEvaluator extends KeyedBroadcastProcessFunction<Long,UserAction,MyPattern, Tuple2<Long,MyPattern>> {
        ValueState<String> prevActionState;

        @Override
        public void open(Configuration parameters) throws Exception {
            //初始化KeyedState
            prevActionState = getRuntimeContext().getState(new ValueStateDescriptor<String>("lastAction", Types.STRING));
        }

        //没来一个Action数据，触发一次执行
        @Override
        public void processElement(UserAction value, ReadOnlyContext ctx, Collector<Tuple2<Long, MyPattern>> out) throws Exception {
            //把用户行为流和模式流中的模式进行匹配
            ReadOnlyBroadcastState<Void, MyPattern> patterns = ctx.getBroadcastState(new MapStateDescriptor<>("patterns", Types.VOID, Types.POJO(MyPattern.class)));
            MyPattern myPattern = patterns.get(null);
            String prevAction = prevActionState.value();
            if(myPattern != null && prevAction != null) {
                if (myPattern.getFirstAction().equals(prevAction) && myPattern.getSecondAction().equals(value.getUserAction())) {
                    //如果匹配成...
                    out.collect(new Tuple2<>(ctx.getCurrentKey(),myPattern));
                } else {
                    //如果匹配不成功...
                }
            }
            prevActionState.update(value.getUserAction());
        }

        //每次来一个模式Pattern的时候触发执行
        @Override
        public void processBroadcastElement(MyPattern value, Context ctx, Collector<Tuple2<Long, MyPattern>> out) throws Exception {
            BroadcastState<Void, MyPattern> bcstate = ctx.getBroadcastState(new MapStateDescriptor<>("patterns", Types.VOID, Types.POJO(MyPattern.class)));
            bcstate.put(null,value);
        }
    }
}

### --- 编程代码实现：UserAction.java

package com.yanqi.state;

public class UserAction {
    private Long userId;
    private String userAction;

    public UserAction(Long userId, String userAction) {
        this.userId = userId;
        this.userAction = userAction;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public String getUserAction() {
        return userAction;
    }

    public void setUserAction(String userAction) {
        this.userAction = userAction;
    }

    @Override
    public String toString() {
        return "UserAction{" +
                "userId=" + userId +
                ", userAction='" + userAction + '\'' +
                '}';
    }
}

### --- 编程代码实现：MyPattern

package com.yanqi.state;

public class MyPattern {
    private String firstAction;
    private String secondAction;

    public MyPattern() {

    }

    public MyPattern(String firstAction, String secondAction) {
        this.firstAction = firstAction;
        this.secondAction = secondAction;
    }

    public String getFirstAction() {
        return firstAction;
    }

    public void setFirstAction(String firstAction) {
        this.firstAction = firstAction;
    }

    public String getSecondAction() {
        return secondAction;
    }

    public void setSecondAction(String secondAction) {
        this.secondAction = secondAction;
    }

    @Override
    public String toString() {
        return "MyPattern{" +
                "firstAction='" + firstAction + '\'' +
                ", secondAction='" + secondAction + '\'' +
                '}';
    }
}

二、编译打印

### --- 编译打印

~~~     # 编译打印：期待结果：login、logout模式匹配成功后打印在控制台
D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=53368:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath 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com.yanqi.state.BroadCastDemo

3> (1001,MyPattern{firstAction='login', secondAction='logout'})

Process finished with exit code 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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