Package hudson.util

Class DoubleLaunchChecker

  • All Implemented Interfaces:
    ExtensionPoint, ModelObject, SearchableModelObject, SearchItem, org.kohsuke.stapler.StaplerProxy

    public class DoubleLaunchChecker
    extends AdministrativeMonitor
    Makes sure that no other Hudson uses our JENKINS_HOME directory, to forestall the problem of running multiple instances of Hudson that point to the same data directory.

    This set up error occasionally happens especially when the user is trying to reassign the context path of the app, and it results in a hard-to-diagnose error, so we actively check this.

    The mechanism is simple. This class occasionally updates a known file inside the hudson home directory, and whenever it does so, it monitors the timestamp of the file to make sure no one else is updating this file. In this way, while we cannot detect the problem right away, within a reasonable time frame we can detect the collision.

    Kohsuke Kawaguchi
    • Field Detail

      • home

        public final File home
    • Constructor Detail

      • DoubleLaunchChecker

        public DoubleLaunchChecker()