feat: Plaintext와 Ssl에서의 전송 시간 메트릭 측정에 사용되는 ConsumerStats 클래스

src/main/java/com/sangdol/consumer/infrastructure/kafka/consumer/ConsumerStats.java

@@ -0,0 +1,30 @@
+package com.sangdol.consumer.infrastructure.kafka.consumer;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+public class ConsumerStats {
+
+	private final int workerThreads;
+	private final Map<String, Long> threadElapsedTime;
+
+	public ConsumerStats(int workerThreads) {
+		this.workerThreads = workerThreads;
+		this.threadElapsedTime = new ConcurrentHashMap<>();
+	}
+
+	public void update(long elapsedTime) {
+		threadElapsedTime.put(Thread.currentThread().getName(), elapsedTime);
+	}
+
+	public long averageTime() {
+		if (threadElapsedTime.size() != workerThreads) {
+			return 0L;
+		}
+
+		return threadElapsedTime.values().stream()
+			.collect(Collectors.averagingLong(Long::longValue))
+			.longValue();
+	}
+}