feat: memory usage logger add (#129)

logbat/src/main/java/info/logbat/LogbatApplication.java

@@ -2,8 +2,10 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
+@EnableScheduling
 public class LogbatApplication {
 
 	public static void main(String[] args) {

logbat/src/main/java/info/logbat/dev/util/MemoryUsageLogger.java

@@ -0,0 +1,48 @@
+package info.logbat.dev.util;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryMXBean;
+import java.lang.management.MemoryUsage;
+
+@Component
+public class MemoryUsageLogger {
+
+    private static final Logger logger = LoggerFactory.getLogger(MemoryUsageLogger.class);
+    private final MemoryMXBean memoryMXBean;
+
+    public MemoryUsageLogger() {
+        this.memoryMXBean = ManagementFactory.getMemoryMXBean();
+    }
+
+    @Scheduled(fixedRate = 1000)
+    public void logMemoryUsage() {
+        // Heap 메모리 사용량
+        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
+        long usedHeapMemory = heapMemoryUsage.getUsed();
+        long maxHeapMemory = heapMemoryUsage.getMax();
+        long committedHeapMemory = heapMemoryUsage.getCommitted();
+
+        // Non-Heap 메모리 사용량
+        MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();
+        long usedNonHeapMemory = nonHeapMemoryUsage.getUsed();
+        long maxNonHeapMemory = nonHeapMemoryUsage.getMax();
+        long committedNonHeapMemory = nonHeapMemoryUsage.getCommitted();
+
+        // Finalization 대기 객체 수
+        int pendingFinalizationCount = memoryMXBean.getObjectPendingFinalizationCount();
+
+        logger.info("Memory Usage [Heap: Used={} MB, Max={} MB, Committed={} MB | Non-Heap: Used={} MB, Max={} MB, Committed={} MB | Pending Finalizations: {}]",
+                usedHeapMemory / 1024 / 1024,
+                maxHeapMemory / 1024 / 1024,
+                committedHeapMemory / 1024 / 1024,
+                usedNonHeapMemory / 1024 / 1024,
+                maxNonHeapMemory / 1024 / 1024,
+                committedNonHeapMemory / 1024 / 1024,
+                pendingFinalizationCount);
+    }
+}