org.knopflerfish.framework

Class StartLevelImpl

java.lang.Object

org.knopflerfish.framework.StartLevelImpl

All Implemented Interfaces:

java.lang.Runnable, StartLevel

public class StartLevelImpl
extends java.lang.Object
implements StartLevel, java.lang.Runnable

StartLevel service implementation.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	SPEC_VERSION

Constructor Summary

Constructors

Constructor and Description
StartLevelImpl(Framework framework)

Method Summary

Methods

Modifier and Type	Method and Description
int	getBundleStartLevel(Bundle bundle) Return the assigned start level value for the specified Bundle.
int	getInitialBundleStartLevel() Return the initial start level value that is assigned to a Bundle when it is first installed.
int	getStartLevel() Return the active start level value of the Framework.
boolean	isBundlePersistentlyStarted(Bundle bundle) Return the persistent state of the specified bundle.
void	run()
void	setBundleStartLevel(Bundle bundle, int startLevel) Assign a start level value to the specified Bundle.
void	setInitialBundleStartLevel(int startLevel) Set the initial start level value that is assigned to a Bundle when it is first installed.
void	setStartLevel(int startLevel) Modify the active start level of the Framework.

Methods inherited from class java.lang.Object

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

Field Detail

SPEC_VERSION

public static final java.lang.String SPEC_VERSION

See Also:

Constant Field Values

Constructor Detail

StartLevelImpl

public StartLevelImpl(Framework framework)

Method Detail

run

public void run()

Specified by:

run in interface java.lang.Runnable

getStartLevel

public int getStartLevel()

Description copied from interface: StartLevel

Return the active start level value of the Framework. If the Framework is in the process of changing the start level this method must return the active start level if this differs from the requested start level.

Specified by:

getStartLevel in interface StartLevel

Returns:

The active start level value of the Framework.

setStartLevel

public void setStartLevel(int startLevel)

Description copied from interface: StartLevel

Modify the active start level of the Framework.

The Framework will move to the requested start level. This method will return immediately to the caller and the start level change will occur asynchronously on another thread.

If the specified start level is higher than the active start level, the Framework will continue to increase the start level until the Framework has reached the specified start level, starting bundles at each start level which are persistently marked to be started as described in the Bundle.start method. At each intermediate start level value on the way to and including the target start level, the framework must:

1. Change the active start level to the intermediate start level value.
2. Start bundles at the intermediate start level in ascending order by Bundle.getBundleId.

When this process completes after the specified start level is reached, the Framework will fire a Framework event of type FrameworkEvent.STARTLEVEL_CHANGED to announce it has moved to the specified start level.

If the specified start level is lower than the active start level, the Framework will continue to decrease the start level until the Framework has reached the specified start level stopping bundles at each start level as described in the Bundle.stop method except that their persistently recorded state indicates that they must be restarted in the future. At each intermediate start level value on the way to and including the specified start level, the framework must:

1. Stop bundles at the intermediate start level in descending order by Bundle.getBundleId.
2. Change the active start level to the intermediate start level value.

When this process completes after the specified start level is reached, the Framework will fire a Framework event of type FrameworkEvent.STARTLEVEL_CHANGED to announce it has moved to the specified start level.

If the specified start level is equal to the active start level, then no bundles are started or stopped, however, the Framework must fire a Framework event of type FrameworkEvent.STARTLEVEL_CHANGED to announce it has finished moving to the specified start level. This event may arrive before the this method return.

Specified by:

setStartLevel in interface StartLevel

Parameters:

startLevel - The requested start level for the Framework.

getBundleStartLevel

public int getBundleStartLevel(Bundle bundle)

Description copied from interface: StartLevel

Return the assigned start level value for the specified Bundle.

Specified by:

getBundleStartLevel in interface StartLevel

Parameters:

bundle - The target bundle.

Returns:

The start level value of the specified Bundle.

setBundleStartLevel

public void setBundleStartLevel(Bundle bundle,
                       int startLevel)

Description copied from interface: StartLevel

Assign a start level value to the specified Bundle.

The specified bundle will be assigned the specified start level. The start level value assigned to the bundle will be persistently recorded by the Framework. If the new start level for the bundle is lower than or equal to the active start level of the Framework, the Framework will start the specified bundle as described in the Bundle.start method if the bundle is persistently marked to be started. The actual starting of this bundle must occur asynchronously. If the new start level for the bundle is higher than the active start level of the Framework, the Framework will stop the specified bundle as described in the Bundle.stop method except that the persistently recorded state for the bundle indicates that the bundle must be restarted in the future. The actual stopping of this bundle must occur asynchronously.

Specified by:

setBundleStartLevel in interface StartLevel

Parameters:

bundle - The target bundle.

startLevel - The new start level for the specified Bundle.

getInitialBundleStartLevel

public int getInitialBundleStartLevel()

Description copied from interface: StartLevel

Return the initial start level value that is assigned to a Bundle when it is first installed.

Specified by:

getInitialBundleStartLevel in interface StartLevel

Returns:

The initial start level value for Bundles.

See Also:

StartLevel.setInitialBundleStartLevel(int)

setInitialBundleStartLevel

public void setInitialBundleStartLevel(int startLevel)

Description copied from interface: StartLevel

Set the initial start level value that is assigned to a Bundle when it is first installed.

The initial bundle start level will be set to the specified start level. The initial bundle start level value will be persistently recorded by the Framework.

When a Bundle is installed via BundleContext.installBundle, it is assigned the initial bundle start level value.

The default initial bundle start level value is 1 unless this method has been called to assign a different initial bundle start level value.

Thie method does not change the start level values of installed bundles.

Specified by:

setInitialBundleStartLevel in interface StartLevel

Parameters:

startLevel - The initial start level for newly installed bundles.

isBundlePersistentlyStarted

public boolean isBundlePersistentlyStarted(Bundle bundle)

Description copied from interface: StartLevel

Return the persistent state of the specified bundle.

This method returns the persistent state of a bundle. The persistent state of a bundle indicates whether a bundle is persistently marked to be started when it's start level is reached.

Specified by:

isBundlePersistentlyStarted in interface StartLevel

Parameters:

bundle - The bundle for which to return the persistently started state.

Returns:

true if the bundle is persistently marked to be started, false if the bundle is not persistently marked to be started.