Package dk.netarkivet.common.utils

Class SystemUtils

  • public class SystemUtils
extends java.lang.Object
    Miscellanous utilities for getting system resources.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String LOCALHOST
      Hostname for this machine used when no name can be found, or when the actual name doesn't matter.

    • Constructor Summary

      Constructors 
      Constructor Description
      SystemUtils()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void checkPortNotUsed​(int port)
      Check that a given port is not in use.
      static java.util.List<java.lang.String> getCurrentClasspath()
      Get the current class path entries.
      static java.lang.String getLocalHostName()
      Get the first hostname available for this machine, or "localhost" if none are available.
      static java.lang.String getLocalIP()
      Looks up the IP number of the local host.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • LOCALHOST

        public static final java.lang.String LOCALHOST
        Hostname for this machine used when no name can be found, or when the actual name doesn't matter.
        See Also:
        Constant Field Values

    • Method Detail

      • getLocalIP

        public static java.lang.String getLocalIP()
        Looks up the IP number of the local host. Note that Java does not guarantee that the result is IPv4 or IPv6.
        Returns:
        the found IP; returns "UNKNOWNIP" if it could not be found.

      • getLocalHostName

        public static java.lang.String getLocalHostName()
        Get the first hostname available for this machine, or "localhost" if none are available.
        Returns:
        A hostname, as returned by InetAddress.getLocalHost().getCanonicalHostName()()

      • checkPortNotUsed

        public static void checkPortNotUsed​(int port)
        Check that a given port is not in use. If this method returns normally, the port is safe to bind.
        Parameters:
        port - Port to check
        Throws:
        IOFailure - if the port cannot be bound.

      • getCurrentClasspath

        public static java.util.List<java.lang.String> getCurrentClasspath()
        Get the current class path entries. Note that this does not work if we've been invoked with java -jar, as that option silently ignores classpaths.
        Returns:
        List of directories/jar files in the current class path.