Class AbstractBoot

  • All Implemented Interfaces:
    SubSystem
    Direct Known Subclasses:
    LibBaseBoot

    public abstract class AbstractBoot
    extends java.lang.Object
    implements SubSystem
    The common base for all Boot classes.

    This initializes the subsystem and all dependent subsystems. Implementors of this class have to provide a public static getInstance() method which returns a singleton instance of the booter implementation.

    Further creation of Boot object should be prevented using protected or private constructors in that class, or proper singleton behaviour cannot be guaranteed.

    Author:
    Thomas Morgner
    • Method Detail

      • getPackageManager

        public PackageManager getPackageManager()
        Returns the packageManager instance of the package manager.
        Specified by:
        getPackageManager in interface SubSystem
        Returns:
        The package manager.
      • isBootInProgress

        public final boolean isBootInProgress()
        Checks, whether the booting is in progress.
        Returns:
        true, if the booting is in progress, false otherwise.
      • isBootDone

        public final boolean isBootDone()
        Checks, whether the booting is complete.
        Returns:
        true, if the booting is complete, false otherwise.
      • start

        public final void start()
        Starts the boot process. The boot process is synchronized and will block if parallel booting is not finished yet. Any failure in booting will set the bootFailed property to true. If booting is finished, the bootDone property is set to true.
      • isBootFailed

        public boolean isBootFailed()
        Checks whether the booting failed. If booting failed, the reason for the failure (the Exception that caused the error) is stored as property bootFailureReason.
        Returns:
        true, if booting failed, false otherwise.
      • getBootFailureReason

        public java.lang.Exception getBootFailureReason()
        Returns the failure reason for the boot process. This method returns null, if booting was successful.
        Returns:
        the failure reason.
      • loadBooter

        public static AbstractBoot loadBooter​(java.lang.String classname,
                                              java.lang.Class source)
        Loads the specified booter-class.
        Parameters:
        classname - the classname of the booter class.
        source - the source-class from where to get the classloader.
        Returns:
        the instantiated booter or null, if no booter could be loaded.