feat | sprint1 | FRB-30 | time stamp 기능 구현 | 조수빈

src/main/java/com/monitory/data/FlinkApplication.java

@@ -1,8 +1,8 @@
 package com.monitory.data;
 
 import com.monitory.data.sources.MqttSource;
+import com.monitory.data.transformations.TimeStampAssigner;
 import org.apache.flink.api.common.eventtime.WatermarkStrategy;
-import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.configuration.Configuration;
 import org.apache.flink.streaming.api.datastream.DataStream;
 import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
@@ -16,16 +16,9 @@ public static void main (String [] args) throws Exception {
         // 2. 데이터 소스
         DataStream<String> sourceStream = env.fromSource(new MqttSource(), WatermarkStrategy.noWatermarks(), "MQTT-Source");
 
-        // 3. 데이터 처리: 단순하게 문자열을 대문자로 변환하는 예시
+        // 3. 데이터 처리: Time Stamp 출력과 Anomaly 감지
         DataStream<String> transformedStream = sourceStream
-                .map(new MapFunction<String, String>() {
-                    @Override
-                    public String map(String value) throws Exception {
-//                        Thread.sleep(2000000);
-                        System.out.println("💡 received: " + value);
-                        return value.toUpperCase();
-                    }
-                });
+                .map(new TimeStampAssigner());
 
         // 4. 데이터 싱크: 콘솔에 출력
         transformedStream.print();

src/main/java/com/monitory/data/transformations/TimeStampAssigner.java

@@ -0,0 +1,20 @@
+package com.monitory.data.transformations;
+
+import org.apache.flink.api.common.functions.MapFunction;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+
+public class TimeStampAssigner implements MapFunction<String, String> {
+
+    private static final ObjectMapper mapper = new ObjectMapper();
+
+    @Override
+    public String map(String value) throws Exception {
+        ObjectNode jsonNode = (ObjectNode) mapper.readTree(value);
+        jsonNode.put("time", LocalDateTime.now().toString());
+        return mapper.writeValueAsString(jsonNode);
+    }
+}