D2Sphere Monitoring Endpoint Spec

• REST Call without Auth

Device Server

needed Values:

• devices Server specific

  • state OK : [true,false]
  • number registred devices : [number(long)]
  • number activated devices : [number(long)]
  • number online devices : [number(long)]
  • number critical devices : [number(long)]

• OS specific

  • CPU core total : [number]
  • RAM total : [number MB]
  • RAM free : [number MB]
  • RAM used : [number MB]
  • HDD total : [number MB]
  • HDD free : [number MB]
  • HDD used : [number MB]
  • LOAD total : [number MB]
  • LOADfree : [number MB]
  • LOAD used : [number MB]

public class Main {
  public static void main(String[] args) {
    /* Total number of processors or cores available to the JVM */
    System.out.println("Available processors (cores): " + 
        Runtime.getRuntime().availableProcessors());

    /* Total amount of free memory available to the JVM */
    System.out.println("Free memory (bytes): " + 
        Runtime.getRuntime().freeMemory());

    /* This will return Long.MAX_VALUE if there is no preset limit */
    long maxMemory = Runtime.getRuntime().maxMemory();
    /* Maximum amount of memory the JVM will attempt to use */
    System.out.println("Maximum memory (bytes): " + 
        (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory));

    /* Total memory currently available to the JVM */
    System.out.println("Total memory available to JVM (bytes): " + 
        Runtime.getRuntime().totalMemory());

    /* Get a list of all filesystem roots on this system */
    File[] roots = File.listRoots();

    /* For each filesystem root, print some info */
    for (File root : roots) {
      System.out.println("File system root: " + root.getAbsolutePath());
      System.out.println("Total space (bytes): " + root.getTotalSpace());
      System.out.println("Free space (bytes): " + root.getFreeSpace());
      System.out.println("Usable space (bytes): " + root.getUsableSpace());
    }
  }
}