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2026-10-27 22:04:28 +01:00
commit 334abce357
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+
+package com.htopweb.system;
+
+import oshi.SystemInfo;
+import oshi.hardware.CentralProcessor;
+import oshi.hardware.GlobalMemory;
+import oshi.hardware.HardwareAbstractionLayer;
+import oshi.software.os.OperatingSystem;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class SystemMetricsService {
+
+    private final SystemInfo _systemInfo;
+    private final HardwareAbstractionLayer _hardware;
+    private final OperatingSystem _operatingSystem;
+    private final CentralProcessor _processor;
+    private final GlobalMemory _memory;
+
+    private long[] _previousCpuTicks;
+
+    public SystemMetricsService() {
+        _systemInfo = new SystemInfo();
+        _hardware = _systemInfo.getHardware();
+        _operatingSystem = _systemInfo.getOperatingSystem();
+        _processor = _hardware.getProcessor();
+        _memory = _hardware.getMemory();
+
+        _previousCpuTicks = _processor.getSystemCpuLoadTicks();
+    }
+
+    public synchronized SystemMetricsResponse getMetrics() {
+        long[] currentCpuTicks = _processor.getSystemCpuLoadTicks();
+
+        double cpuUsage = _processor.getSystemCpuLoadBetweenTicks(
+                _previousCpuTicks,
+                currentCpuTicks
+        );
+
+        _previousCpuTicks = currentCpuTicks;
+
+        if (Double.isNaN(cpuUsage) || Double.isInfinite(cpuUsage)) {
+            cpuUsage = 0.0;
+        }
+
+        // Task Manager displays system CPU usage in the 0–100% range.
+        cpuUsage = Math.max(0.0, Math.min(1.0, cpuUsage));
+
+        long totalMemory = _memory.getTotal();
+        long availableMemory = _memory.getAvailable();
+        long usedMemory = Math.max(0L, totalMemory - availableMemory);
+
+        double memoryUsage = totalMemory > 0
+                ? (double) usedMemory / totalMemory * 100.0
+                : 0.0;
+
+        return new SystemMetricsResponse(
+                _operatingSystem.getFamily(),
+                _operatingSystem.getVersionInfo().getVersion(),
+                _operatingSystem.getNetworkParams().getHostName(),
+                _processor.getProcessorIdentifier().getName(),
+                _processor.getLogicalProcessorCount(),
+                round(cpuUsage * 100.0),
+                totalMemory,
+                availableMemory,
+                usedMemory,
+                round(memoryUsage)
+        );
+    }
+
+    private double round(double value) {
+        return Math.round(value * 10.0) / 10.0;
+    }
+}