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Question

嗨，我是kafka的新手，我正在用kafka流编写一个Java项目，该项目可以检测设备是否出现在用户定义的范围内。

我在内存状态中使用2个，其中一个称为记录，另一个称为GPS-info

builder.addStateStore(Stores.keyValueStoreBuilder(
                Stores.inMemoryKeyValueStore("records"),
                Serdes.String(),
                Serdes.Integer()),
                "Process");
        builder.addStateStore(Stores.keyValueStoreBuilder(
                Stores.inMemoryKeyValueStore("GPS"),
                Serdes.String(),
                Serdes.String()),
                "Process");

功能是，如果用户输入的是GPS配置，它将更新为GPS；如果用户输入的是GPS坐标，它将首先找到GPS配置，然后检测设备是否在范围内。

 @Override
                @SuppressWarnings("unchecked")
                public void init(final ProcessorContext context) {
                    this.kvStore = (KeyValueStore<String, Integer>) context.getStateStore("records");
                    this.GPSStore = (KeyValueStore<String, String>) context.getStateStore("GPS");
                    this.context = context;
         });

                }

                @Override
                public void process(String dummy, String line) {
                    String[] words = line.toLowerCase(Locale.getDefault()).split(" ");
                    String Device_ID = words[0];
                    if(words.length == 3){
                        String GPS_info = this.GPSStore.get(Device_ID);
                        System.out.println("Device_ID " + Device_ID + " GPS_info " + GPS_info);
                        if(GPS_info == null){
                            System.out.println("Haven't find the GPS information of this Device");
                        }else{
                            String[] GPS_data = GPS_info.split(" ");
                            Range range = new Range(Double.parseDouble(GPS_data[0]), Double.parseDouble(GPS_data[1]), Double.parseDouble(GPS_data[2]));
                            Integer oldValue = this.kvStore.get(Device_ID);
                            System.out.println("DeviceID: " + Device_ID + " POS_X: " + words[1] + " POX_Y: " + words[2]);
                            double distance = range.getDistance(Double.parseDouble(words[1]), Double.parseDouble(words[2]));
                            int isInside = range.isAppear(distance) ? 0 : 1;
                            if (oldValue == null) {
                                System.out.println("Create new states Device_ID: " + Device_ID + " " + isInside);
                                this.kvStore.put(Device_ID, isInside);
                            } else {
                                System.out.println("Found States " + Device_ID + " " + isInside);
                                if(isInside != oldValue){
                                    this.kvStore.put(Device_ID, isInside);
                                    System.out.println("Found States " + Device_ID + "changed to" + isInside);
                                }else{
                                    System.out.println("Found States " + Device_ID + "not changed");
                                }
                            }
                        }
                    }else if(words.length == 4){
                        System.out.println("Now add GPS information");
                        if(Integer.parseInt(words[3]) < 0){
                            System.out.println("Range cannot be negative");
                        }else{
                            String value = words[1] + " " + words[2] + " " + words[3];
                            this.GPSStore.put(Device_ID, value);
                            System.out.println("DeviceID: " + Device_ID + " POS_X: " + words[1] + " POX_Y: " + words[2] + " Range: " + words[3] + " add to GPSStore");
                            this.printStateStore(this.GPSStore);
                        }
                    }else{
                        System.out.println("Input is not vaild");
                    }


                    context.commit();
                }

在这里我遇到了2个问题。

首先，我首先将设备配置添加到GPS状态存储中，然后输入表示未找到GPS信息的坐标，然后将所有记录打印到状态存储中，然后找到它。

Device_ID 2 GPS_info null
Haven't find the GPS information of this Device
Now add GPS information
DeviceID: 3 POS_X: 0 POX_Y: 0 Range: 10 add to GPSStore
[2, 0 0 10]
[3, 0 0 10]
Device_ID 1 GPS_info 0 0 10
DeviceID: 1 POS_X: 1 POX_Y: 1
Found States 1 0
Found States 1not changed
Device_ID 3 GPS_info null
Haven't find the GPS information of this Device

就像设备ID 2和3一样，它可以在状态存储中打印，但系统找不到它

第二，我可以找到Device_ID 1的GPS信息，但是无法在状态存储中打印

public void printStateStore(KeyValueStore<String, String> statestore){
                KeyValueIterator<String, String> iter = statestore.all();
                while (iter.hasNext()){
                    KeyValue<String, String> entry = iter.next();
                    System.out.println("[" + entry.key + ", " + entry.value + "]");
                }

            }