Package org.osgi.service.subsystem

Enum Subsystem.State

java.lang.Object

java.lang.Enum<Subsystem.State>

org.osgi.service.subsystem.Subsystem.State

Enclosing interface:

Subsystem

public static enum Subsystem.State
extends java.lang.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 Summary

Enum Constants

Enum Constant	Description
ACTIVE	The subsystem is now running.
INSTALL_FAILED	The subsystem failed to install.
INSTALLED	The subsystem is installed but not yet resolved.
INSTALLING	The subsystem is in the process of installing.
RESOLVED	The subsystem is resolved and able to be started.
RESOLVING	The subsystem is in the process of resolving.
STARTING	The subsystem is in the process of starting.
STOPPING	The subsystem is in the process of stopping.
UNINSTALLED	The subsystem is uninstalled and may not be used.
UNINSTALLING	The subsystem is in the process of uninstalling.

Method Summary

Modifier and Type	Method	Description
static Subsystem.State	valueOf(java.lang.String name)	Returns the enum constant of this type with the specified name.
static Subsystem.State[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

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 Detail

values

public static Subsystem.State[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Subsystem.State c : Subsystem.State.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Subsystem.State valueOf(java.lang.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:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null