Enum Subsystem.State

java.lang.Object
java.lang.Enum<Subsystem.State>
org.osgi.service.subsystem.Subsystem.State
All Implemented Interfaces:
Serializable, Comparable<Subsystem.State>, java.lang.constant.Constable
Enclosing interface:
Subsystem

public static enum Subsystem.State extends Enum<Subsystem.State>
An enumeration of the possible states of a subsystem.

These states are a reflection of what constituent resources are permitted to do and not an aggregation of constituent resource states.

  • Enum Constant Details

    • INSTALLING

      public static final Subsystem.State INSTALLING
      The subsystem is in the process of installing.

      A subsystem is in the INSTALLING state when the install method of its parent is active, and attempts are being made to install its content resources. If the install method completes without exception, then the subsystem has successfully installed and must move to the INSTALLED state. Otherwise, the subsystem has failed to install and must move to the INSTALL_FAILED state.

    • INSTALLED

      public static final Subsystem.State INSTALLED
      The subsystem is installed but not yet resolved.

      A subsystem is in the INSTALLED state when it has been installed in a parent subsystem but is not or cannot be resolved. This state is visible if the dependencies of the subsystem's content resources cannot be resolved.

    • INSTALL_FAILED

      public static final Subsystem.State INSTALL_FAILED
      The subsystem failed to install.

      A subsystem is in the INSTALL_FAILED state when an unrecoverable error occurred during installation. The subsystem is in an unusable state but references to the subsystem object may still be available and used for introspection.

    • RESOLVING

      public static final Subsystem.State RESOLVING
      The subsystem is in the process of resolving.

      A subsystem is in the RESOLVING state when attempts are being made to resolve its content resources. If the resolve process completes without exception, then the subsystem has successfully resolved and must move to the RESOLVED state. Otherwise, the subsystem has failed to resolve and must move to the INSTALLED state.

    • RESOLVED

      public static final Subsystem.State RESOLVED
      The subsystem is resolved and able to be started.

      A subsystem is in the RESOLVED state when all of its content resources are resolved. Note that the subsystem is not active yet.

    • STARTING

      public static final Subsystem.State STARTING
      The subsystem is in the process of starting.

      A subsystem is in the STARTING state when its start method is active, and attempts are being made to start its content and dependencies. If the start method completes without exception, then the subsystem has successfully started and must move to the ACTIVE state. Otherwise, the subsystem has failed to start and must move to the RESOLVED state.

    • ACTIVE

      public static final Subsystem.State ACTIVE
      The subsystem is now running.

      A subsystem is in the ACTIVE state when its content and dependencies have been successfully started.

    • STOPPING

      public static final Subsystem.State STOPPING
      The subsystem is in the process of stopping.

      A subsystem is in the STOPPING state when its stop method is active, and attempts are being made to stop its content and dependencies. When the stop method completes, the subsystem is stopped and must move to the RESOLVED state.

    • UNINSTALLING

      public static final Subsystem.State UNINSTALLING
      The subsystem is in the process of uninstalling.

      A subsystem is in the UNINSTALLING state when its uninstall method is active, and attempts are being made to uninstall its constituent and dependencies. When the uninstall method completes, the subsystem is uninstalled and must move to the UNINSTALLED state.

    • UNINSTALLED

      public static final Subsystem.State UNINSTALLED
      The subsystem is uninstalled and may not be used.

      The UNINSTALLED state is only visible after a subsystem's constituent and dependencies are uninstalled. The subsystem is in an unusable state but references to the subsystem object may still be available and used for introspection.

  • Method Details

    • values

      public static Subsystem.State[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      Returns:
      an array containing the constants of this enum type, in the order they are declared
    • valueOf

      public static Subsystem.State valueOf(String name)
      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum type has no constant with the specified name
      NullPointerException - if the argument is null