1.监控策略配置文件格式优化

2025-10-30 19:31:12 +08:00
parent c4bb76049a
commit ae5c50e5b4
4 changed files with 128 additions and 46 deletions
@@ -0,0 +1,70 @@
+package com.tongran.agent.client.utils;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+public class CpuUsageFromProcStat {
+
+    private static final String PROC_STAT = "/proc/stat";
+    private static long[] prevCpuTime = null;
+
+    public static double getCpuUsage() throws Exception {
+        List<String> lines = Files.readAllLines(Paths.get(PROC_STAT));
+        for (String line : lines) {
+            if (line.startsWith("cpu ")) {
+                long[] current = parseCpuLine(line);
+                if (prevCpuTime == null) {
+                    prevCpuTime = current;
+                    Thread.sleep(500); // 初始等待
+                    return 0.0; // 第一次不返回数据
+                }
+
+                double usage = calculateCpuUsage(prevCpuTime, current);
+                prevCpuTime = current; // 更新
+                return usage;
+            }
+        }
+        throw new RuntimeException("无法读取 /proc/stat 中的 cpu 数据");
+    }
+
+    private static long[] parseCpuLine(String line) {
+        String[] parts = line.split("\\s+");
+        // index: user, nice, system, idle, iowait, irq, softirq, steal
+        long user = Long.parseLong(parts[1]);
+        long nice = Long.parseLong(parts[2]);
+        long system = Long.parseLong(parts[3]);
+        long idle = Long.parseLong(parts[4]);
+        long iowait = Long.parseLong(parts[5]);
+        long irq = Long.parseLong(parts[6]);
+        long softirq = Long.parseLong(parts[7]);
+
+        long idleTotal = idle + iowait;
+        long systemTotal = user + nice + system + irq + softirq;
+        long total = idleTotal + systemTotal;
+
+        return new long[]{idleTotal, total};
+    }
+
+    private static double calculateCpuUsage(long[] prev, long[] curr) {
+        long idleDiff = curr[0] - prev[0];
+        long totalDiff = curr[1] - prev[1];
+
+        if (totalDiff <= 0) return 0.0;
+
+        return 1.0 - ((double) idleDiff / totalDiff);
+    }
+
+    public static void main(String[] args) throws Exception {
+        // 预热
+        getCpuUsage();
+        Thread.sleep(1000);
+
+        // 正式采集
+        for (int i = 0; i < 5; i++) {
+            double usage = getCpuUsage();
+            System.out.printf("CPU 使用率: %.2f%%\n", usage * 100);
+            Thread.sleep(2000);
+        }
+    }
+}