Update load usage calculation

Signed-off-by: yoyosource <yoyosource@nidido.de>

BauSystem_Main/src/de/steamwar/bausystem/features/world/RamUsage.java

@@ -28,6 +28,7 @@ import java.util.concurrent.locks.LockSupport;
 public class RamUsage {
 
     private File meminfo = new File("/proc/meminfo");
+    private File stat = new File("/proc/stat");
 
     private double usageSelf = 0D;
     private double usage = 0D;
@@ -48,7 +49,7 @@ public class RamUsage {
                 // System.out.println("Self: " + usageSelf + "/" + usageSelfByMax + /* " " + maxMemory + " " + totalMemory + " " + freeMemory + " " + usedMemory + */ "   Ram: " + usage + "   CPU: " + load);
 
                 usage = _getUsage();
-                // load = _getLoad();
+                load = _getLoad();
                 Thread.yield();
                 LockSupport.parkNanos(1000000000L);
             }
@@ -80,21 +81,40 @@ public class RamUsage {
         return load;
     }
 
+    private long lastCpuSecond = -1;
+    private long lastCpuForth = -1;
+    private long lastCpuFifth = -1;
+
     private static double _getLoad() {
-        try {
-            Process process = new ProcessBuilder("bash", "-c", "cat <(grep 'cpu ' /proc/stat) <(sleep 1 && grep 'cpu ' /proc/stat) | awk -v RS=\"\" '{printf \"%.2f\\n\", ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}'").start();
-            process.waitFor();
-            return Double.parseDouble(new BufferedReader(new InputStreamReader(process.getInputStream())).readLine());
+        try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(stat)))) {
+            String[] strings = bufferedReader.readLine().split(" ");
+
+            long cpuSecond = Long.parseLong(strings[2]);
+            long cpuForth = Long.parseLong(strings[4]);
+            long cpuFifth = Long.parseLong(strings[5]);
+
+            if (lastCpuSecond == -1) {
+                lastCpuSecond = cpuSecond;
+                lastCpuForth = cpuForth;
+                lastCpuFifth = cpuFifth;
+                return 0D;
+            }
+
+            long cpuSecondDiff = cpuSecond - lastCpuSecond;
+            long cpuForthDiff = cpuForth - lastCpuForth;
+            long cpuSixthDiff = cpuFifth - lastCpuFifth;
+
+            lastCpuSecond = cpuSecond;
+            lastCpuForth = cpuForth;
+            lastCpuFifth = cpuFifth;
+
+            return (cpuSecondDiff + cpuForthDiff) / (double) (cpuSecondDiff + cpuForthDiff + cpuSixthDiff);
         } catch (IOException e) {
             return 1D;
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            return 1D;
         }
     }
 
     private static long getNumber(String s) {
         return Long.parseLong(s.split(" ")[1]);
     }
-
 }