Fllink实时计算运用（九）Flink 大数据实战案例二-原创手记-慕课网

1. 订单支付状态跟踪统计（CEP运用）

功能

实现对热销商品的统计，统计周期为一天，每3秒刷新一次数据。

核心代码

主逻辑代码实现：

  
    /**
     * 执行Flink任务处理
     * @throws Exception
     */
    private void executeFlinkTask() throws Exception {

        // 1. 创建运行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 2. 设置kafka服务连接信息
        Properties properties = new Properties();
        properties.setProperty("bootstrap.servers", "10.10.20.132:9092");
        properties.setProperty("group.id", "fink_group");

        // 3. 创建Kafka消费端
        FlinkKafkaConsumer kafkaProducer = new FlinkKafkaConsumer(
                "orderPayment_binlog",                  // 目标 topic
                new SimpleStringSchema(),   // 序列化 配置
                properties);

        // 调试，重新从最早记录消费
        kafkaProducer.setStartFromEarliest();     // 尽可能从最早的记录开始
        env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
        env.setParallelism(1);

        // 4. 读取Kafka数据源
        DataStreamSource<String> socketStr = env.addSource(kafkaProducer);

        // 5. 数据过滤转换处理
        DataStream<OrderPayment> orderPaymentDataStream = socketStr.filter(new FilterFunction<String>() {
            @Override
            public boolean filter(String value) throws Exception {
                JsonObject jsonObject = GsonConvertUtil.getSingleton().getJsonObject(value);
                String isDDL = jsonObject.get("isDdl").getAsString();
                String type = jsonObject.get("type").getAsString();
                // 过滤条件： 非DDL操作， 并且是新增的数据
                return isDDL.equalsIgnoreCase("false") && "INSERT".equalsIgnoreCase(type);
            }
        }).flatMap(new FlatMapFunction<String, OrderPayment>() {
            @Override
            public void flatMap(String value, Collector<OrderPayment> out) throws Exception {
                // 获取JSON中的data数据
                JsonArray dataArray = GsonConvertUtil.getSingleton().getJsonObject(value).getAsJsonArray("data");
                // 将data数据转换为java对象
                for(int i =0; i< dataArray.size(); i++) {
                    JsonObject jsonObject = dataArray.get(i).getAsJsonObject();
                    OrderPayment orderPayment = GsonConvertUtil.getSingleton().cvtJson2Obj(jsonObject, OrderPayment.class);
                    System.out.println("orderPayment => " + orderPayment);
                    out.collect(orderPayment);
                }
            }
        })
        .assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<OrderPayment>(Time.seconds(0)) {
            @Override
            public long extractTimestamp(OrderPayment element) {
                return element.getUpdateTime();
            }
        })
        .keyBy(OrderPayment::getOrderId);
  
        // 6.通过CEP机制， 判断支付成功的数据
        Pattern<OrderPayment, ?> pattern = Pattern.<OrderPayment>begin("begin")
                .where(new SimpleCondition<OrderPayment>() {
                    @Override
                    public boolean filter(OrderPayment value) throws Exception {
                        return value.getStatus() == 0;
                    }
                }).next("follow").where(new SimpleCondition<OrderPayment>() {
                    @Override
                    public boolean filter(OrderPayment value) throws Exception {
                        return value.getStatus() == 1;
                    }
                }).within(Time.seconds(15)).times(1);

        PatternStream<OrderPayment> patternStream = CEP.pattern(orderPaymentDataStream, pattern);
        // 7.定义超时数据的TAG标记
        OutputTag orderExpired = new OutputTag<OrderPayment>("orderExpired"){};
        DataStream<OrderPaymentResult> selectResult = patternStream.select(orderExpired,
                new OrderExpiredMatcher(), new OrderPayedMatcher());
        selectResult.print("payed");

        // 8. 创建Kafka消费端（订单数据源）
        FlinkKafkaConsumer orderKafkaProducer = new FlinkKafkaConsumer(
                "order_binlog",                  // 目标 topic
                new SimpleStringSchema(),   // 序列化 配置
                properties);

        orderKafkaProducer.setStartFromEarliest();     // 尽可能从最早的记录开始
        env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
        env.setParallelism(1);

        DataStreamSource<String> orderSource = env.addSource(orderKafkaProducer);

        // 9. 数据过滤转换处理(订单数据源）
        DataStream<Order> orderDataStream = orderSource.filter(new FilterFunction<String>() {
            @Override
            public boolean filter(String value) throws Exception {
                JsonObject jsonObject = GsonConvertUtil.getSingleton().getJsonObject(value);
                String isDDL = jsonObject.get("isDdl").getAsString();
                String type = jsonObject.get("type").getAsString();
                // 过滤条件： 非DDL操作， 并且是新增的数据
                return isDDL.equalsIgnoreCase("false") && "INSERT".equalsIgnoreCase(type);
            }
        }).flatMap(new FlatMapFunction<String, Order>() {
            @Override
            public void flatMap(String value, Collector<Order> out) throws Exception {
                // 获取JSON中的data数据
                JsonArray dataArray = GsonConvertUtil.getSingleton().getJsonObject(value).getAsJsonArray("data");
                // 将data数据转换为java对象
                for(int i =0; i< dataArray.size(); i++) {
                    JsonObject jsonObject = dataArray.get(i).getAsJsonObject();
                    Order order = GsonConvertUtil.getSingleton().cvtJson2Obj(jsonObject, Order.class);
                    System.out.println("order => " + order);
                    out.collect(order);
                }
            }
        })
        .assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<Order>(Time.seconds(0)) {
            @Override
            public long extractTimestamp(Order element) {
                return element.getExecTime();
            }
        });

        // 10. 数据源关联处理
        orderDataStream.keyBy(Order::getId).intervalJoin(selectResult.keyBy(OrderPaymentResult::getOrderId))
                .between(Time.seconds(0), Time.seconds(15))
                .process(new ProcessJoinFunction<Order, OrderPaymentResult, JoinOrderPayment>() {
                    @Override
                    public void processElement(Order left, OrderPaymentResult right, Context ctx, Collector<JoinOrderPayment> out) throws Exception {
                        JoinOrderPayment joinResult = JoinOrderPayment.build(left, right);
                        out.collect(joinResult);
                    }
                })
                .assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<JoinOrderPayment>(Time.seconds(0)) {
                    @Override
                    public long extractTimestamp(JoinOrderPayment element) {
                        return element.getUpdateTime();
                    }
                })
                .keyBy(JoinOrderPayment::getGoodsId)
                .timeWindow(Time.hours(24), Time.seconds(3))
                .aggregate(new TotalAmount(), new AmountWindow())
                .keyBy(HotOrder::getTimeWindow)
                .process(new TopNHotOrder());

        // 11. 执行任务
        env.execute("job");
    }

商品金额累加器：

   /**
     * 商品金额累加器
     */
    private static class TotalAmount implements AggregateFunction<JoinOrderPayment, JoinOrderPayment, JoinOrderPayment> {
        @Override
        public JoinOrderPayment createAccumulator() {
            JoinOrderPayment order = new JoinOrderPayment();
            order.setTotalAmount(0l);
            return order;
        }

        /**
         * 商品销售总金额累加处理
         * @param value
         * @param accumulator
         * @return
         */
        @Override
        public JoinOrderPayment add(JoinOrderPayment value, JoinOrderPayment accumulator) {
            accumulator.setGoodsId(value.getGoodsId());
            accumulator.setGoodsName((value.getGoodsName()));
            accumulator.setStatus(value.getStatus());
            accumulator.setUpdateTime(value.getUpdateTime());
            accumulator.setTotalAmount(accumulator.getTotalAmount() + (value.getExecPrice() * value.getExecVolume()));
            return accumulator;
        }

        @Override
        public JoinOrderPayment getResult(JoinOrderPayment accumulator) {
            return accumulator;
        }

        @Override
        public JoinOrderPayment merge(JoinOrderPayment a, JoinOrderPayment b) {
            return null;
        }
    }

热销商品转换处理：

	/**
     * 热销商品， 时间窗口对象转换处理
     */
    private static class AmountWindow implements WindowFunction<JoinOrderPayment, HotOrder, Long, TimeWindow> {

        @Override
        public void apply(Long goodsId, TimeWindow window, Iterable<JoinOrderPayment> input, Collector<HotOrder> out) throws Exception {
            JoinOrderPayment order = input.iterator().next();
            out.collect(new HotOrder(order.getGoodsId(), order.getGoodsName(), order.getTotalAmount(), window.getEnd()));
        }
    }

热销商品的统计排行实现：

	/**
     * 热销商品的统计排行实现
     */
    private class TopNHotOrder extends KeyedProcessFunction<Long, HotOrder, String> {

        private ListState<HotOrder> orderState;

        @Override
        public void processElement(HotOrder value, Context ctx, Collector<String> out) throws Exception {
            // 将数据加入到状态列表里面
            orderState.add(value);
            // 注册定时器
            ctx.timerService().registerEventTimeTimer(value.getTimeWindow());
        }

        @Override
        public void onTimer(long timestamp, OnTimerContext ctx, Collector<String> out) throws Exception {
            List<HotOrder> orderList = new ArrayList<>();
            for(HotOrder order : orderState.get()){
                orderList.add(order);
            }
            // 按照成交总金额， 倒序排列
            orderList.sort(Comparator.comparing(HotOrder::getTotalAmount).reversed());
            orderState.clear();
            // 将数据写入至ES
            HotOrderRepository hotOrderRepository = (HotOrderRepository) ApplicationContextUtil.getBean("hotOrderRepository");
            StringBuffer strBuf = new StringBuffer();
            for(HotOrder order: orderList) {
                order.setId(order.getGoodsId());
                order.setCreateDate(new Date(order.getTimeWindow()));
                hotOrderRepository.save(order);
                strBuf.append(order).append("\n");
                System.out.println("result => " + order);
            }
            out.collect(strBuf.toString());
        }

        @Override
        public void open(Configuration parameters) throws Exception {
            super.open(parameters);
            orderState = getRuntimeContext().getListState(new ListStateDescriptor<HotOrder>("hot-order", HotOrder.class));

        }
    }

超时数据的匹配处理:

private class OrderExpiredMatcher implements PatternTimeoutFunction<OrderPayment, OrderPaymentResult> {
        @Override
        public OrderPaymentResult timeout(Map<String, List<OrderPayment>> map, long l) throws Exception {
            OrderPaymentResult result = new OrderPaymentResult();
            OrderPayment payment = map.get("begin").iterator().next();
            result.setOrderId(payment.getOrderId());
            result.setStatus(payment.getStatus());
            result.setUpdateTime(payment.getUpdateTime());
            result.setMessage("支付超时");
            return result;
        }
    }

支付成功的匹配处理:

private class OrderPayedMatcher implements PatternSelectFunction<OrderPayment, OrderPaymentResult> {

        @Override
        public OrderPaymentResult select(Map<String, List<OrderPayment>> map) throws Exception {
            OrderPaymentResult result = new OrderPaymentResult();
            OrderPayment payment = map.get("follow").iterator().next();
            result.setOrderId(payment.getOrderId());
            result.setStatus(payment.getStatus());
            result.setUpdateTime(payment.getUpdateTime());
            result.setMessage("支付成功");
            return result;
        }
    }

2. 商品UV统计（普通统计）

功能

统计商品在一段时间内的UV（Unique Visitor），去重后的点击量，根据IP去重。

核心代码

主逻辑实现：

public class ScreenUniqueVisitorProcessor {

    /**
     * 执行flink任务处理
     * @throws Exception
     */
    public void executeFlinkTask() throws Exception {
        // 1. 创建运行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setStreamTimeCharacteristic(TimeCharacteristic.IngestionTime);
        env.setParallelism(1);

        // 2. 读取Socket数据源
//        DataStreamSource<String> socketStr = env.socketTextStream("localhost", 9911, "\n");
        DataStreamSource<String> socketStr = env.readTextFile("./data/goods_access.log");

        // 3. 数据解析转换处理
        socketStr.flatMap(new FlatMapFunction<String, GoodsAccessLog>() {

            @Override
            public void flatMap(String value, Collector<GoodsAccessLog> out) throws Exception {
                // 获取Json中的data数据
                // 根据分隔符解析数据
                String[] arrValue = value.split("\t");
                System.out.println("receive msg => " + value);
                // 将数据组装为对象
                GoodsAccessLog log = new GoodsAccessLog();
                for(int i=0; i<arrValue.length; i++) {
                    if(i == 0) {
                        log.setIp(arrValue[i]);
                    }else if( i== 1) {
                        log.setAccessTime(Long.valueOf(arrValue[i]));
                    }else if( i== 2) {
                        log.setEventType(arrValue[i]);
                    }else if( i== 3) {
                        log.setGoodsId(arrValue[i]);
                    }
                }
                out.collect(log);
            }
        })
        .filter(new FilterFunction<GoodsAccessLog>() {
            @Override
            public boolean filter(GoodsAccessLog value) throws Exception {
                return value.getEventType().equals("view");
            }
        })
        .keyBy(GoodsAccessLog::getGoodsId)
        .timeWindow(Time.seconds(10))
        .process( new ProcessWindowFunction<GoodsAccessLog, Map<String, String> , String, TimeWindow>(){
            @Override
            public void process(String key, Context context, Iterable<GoodsAccessLog> elements, Collector<Map<String, String>> out) throws Exception {
                Set<String> ipSet = new HashSet<>();
                Map<String, String> goodsUV = new LinkedHashMap<>();
                elements.forEach( log -> {
                    ipSet.add(log.getIp());
                });
                goodsUV.put(key , context.window().getEnd() + ":" + ipSet.size());
                out.collect(goodsUV);
            }
        })
        .print("uv result").setParallelism(1);

        // 5. 执行任务
        env.execute("job");
    }

}

热销商品的金额累加处理：

/**
 * 商品金额累加器
 */
private static class TotalAmount implements AggregateFunction<Order, Order, Order> {
    @Override
    public Order createAccumulator() {
        Order order = new Order();
        order.setTotalAmount(0l);
        return order;
    }

    /**
     * 累加统计商品销售总金额
     * @param value
     * @param accumulator
     * @return
     */
    @Override
    public Order add(Order value, Order accumulator) {
        accumulator.setGoodsId(value.getGoodsId());
        accumulator.setGoodsName((value.getGoodsName()));
        accumulator.setTotalAmount(accumulator.getTotalAmount() + (value.getExecPrice() * value.getExecVolume()));
        return accumulator;
    }

    @Override
    public Order getResult(Order accumulator) {
        return accumulator;
    }

    @Override
    public Order merge(Order a, Order b) {
        return null;
    }
}

热销商品的数据转换处理，用于统计：

/**
 * 热销商品， 在时间窗口内， 对象数据的转换处理
 */
private static class AmountWindow implements WindowFunction<Order, HotOrder, Long, TimeWindow> {

    @Override
    public void apply(Long goodsId, TimeWindow window, Iterable<Order> input, Collector<HotOrder> out) throws Exception {
        Order order = input.iterator().next();
        out.collect(new HotOrder(goodsId, order.getGoodsName(), order.getTotalAmount(), window.getEnd()));
    }
}

热销商品的统计排行处理逻辑：

/**
 * 热销商品的统计排行实现
 */
private class TopNHotOrder extends KeyedProcessFunction<Long, HotOrder, String> {

    private ListState<HotOrder> orderState;

    @Override
    public void processElement(HotOrder value, Context ctx, Collector<String> out) throws Exception {
        // 将数据加入到状态列表里面
        orderState.add(value);
        // 注册定时器
        ctx.timerService().registerEventTimeTimer(value.getTimeWindow());
    }

    @Override
    public void onTimer(long timestamp, OnTimerContext ctx, Collector<String> out) throws Exception {
        List<HotOrder> orderList = new ArrayList<>();
        for(HotOrder order : orderState.get()){
            orderList.add(order);
        }
        // 按照成交总金额， 倒序排列
        orderList.sort(Comparator.comparing(HotOrder::getTotalAmount).reversed());
        orderState.clear();
        // 将数据写入至ES
        HotOrderRepository hotOrderRepository = (HotOrderRepository) ApplicationContextUtil.getBean("hotOrderRepository");
        StringBuffer strBuf = new StringBuffer();
        for(HotOrder order: orderList) {
            order.setId(order.getGoodsId());
            order.setCreateDate(new Date(order.getTimeWindow()));
            hotOrderRepository.save(order);
            strBuf.append(order).append("\n");
            System.out.println("result => " + order);
        }
        out.collect(strBuf.toString());
    }

    @Override
    public void open(Configuration parameters) throws Exception {
        super.open(parameters);
        orderState = getRuntimeContext().getListState(new ListStateDescriptor<HotOrder>("hot-order", HotOrder.class));

    }
}

3. 商品UV统计（布隆过滤器）

功能

功能：统计商品在一段时间内的UV（采用布隆过滤器），去重后的点击量，根据IP去重。

核心代码

主逻辑代码：

/**
 * 执行flink任务处理
 * @throws Exception
 */
public void executeFlinkTask() throws Exception {
    // 1. 创建运行环境
    StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);

    // 2. 读取Socket数据源
//        DataStreamSource<String> socketStr = env.socketTextStream("localhost", 9911, "\n");
    DataStreamSource<String> socketStr = env.readTextFile("./data/goods_access.log");
    // 3. 数据解析转换处理
    socketStr.flatMap(new FlatMapFunction<String, GoodsAccessLog>() {

        @Override
        public void flatMap(String value, Collector<GoodsAccessLog> out) throws Exception {
            // 获取Json中的data数据
            // 根据分隔符解析数据
            String[] arrValue = value.split("\t");
            // 将数据组装为对象
            GoodsAccessLog log = new GoodsAccessLog();
            for(int i=0; i<arrValue.length; i++) {
                if(i == 0) {
                    log.setIp(arrValue[i]);
                }else if( i== 1) {
                    log.setAccessTime(Long.valueOf(arrValue[i]));
                }else if( i== 2) {
                    log.setEventType(arrValue[i]);
                }else if( i== 3) {
                    log.setGoodsId(arrValue[i]);
                }
            }
            out.collect(log);
        }
    })
    .assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<GoodsAccessLog>(Time.seconds(0)) {
        @Override
        public long extractTimestamp(GoodsAccessLog element) {
            return element.getAccessTime();
        }
    })
    .filter(new FilterFunction<GoodsAccessLog>() {
        @Override
        public boolean filter(GoodsAccessLog value) throws Exception {
            return value.getEventType().equals("view");
        }
    })
    .keyBy(GoodsAccessLog::getGoodsId)
    .timeWindow(Time.minutes(30))
    .trigger(new CustomWindowTrigger())
    .process(new CustomUVBloom())
    .keyBy(0)
    .timeWindow(Time.seconds(3))
    .max(1)
    .print("uv result => ").setParallelism(1);
    // 5. 执行任务
    env.execute("job");
}