org.osgi.framework.launch

Interface Framework

All Superinterfaces:

Bundle, java.lang.Comparable<Bundle>

@ProviderType
public interface Framework
extends Bundle

A Framework instance. A Framework is also known as a System Bundle.

Framework instances are created using a FrameworkFactory. The methods of this interface can be used to manage and control the created framework instance.

"ThreadSafe"

Field Summary

Fields inherited from interface org.osgi.framework.Bundle

ACTIVE, INSTALLED, RESOLVED, SIGNERS_ALL, SIGNERS_TRUSTED, START_ACTIVATION_POLICY, START_TRANSIENT, STARTING, STOP_TRANSIENT, STOPPING, UNINSTALLED

Method Summary

Modifier and Type	Method and Description
<A> A	adapt(java.lang.Class<A> type) Adapt this Framework to the specified type.
java.util.Enumeration<java.net.URL>	findEntries(java.lang.String path, java.lang.String filePattern, boolean recurse) Returns null as a framework implementation does not have a proper bundle from which to return entries.
long	getBundleId() Returns the Framework unique identifier.
java.net.URL	getEntry(java.lang.String path) Returns null as a framework implementation does not have a proper bundle from which to return an entry.
java.util.Enumeration<java.lang.String>	getEntryPaths(java.lang.String path) Returns null as a framework implementation does not have a proper bundle from which to return entry paths.
long	getLastModified() Returns the time when the set of bundles in this framework was last modified.
java.lang.String	getLocation() Returns the Framework location identifier.
java.lang.String	getSymbolicName() Returns the symbolic name of this Framework.
void	init() Initialize this Framework.
void	init(FrameworkListener... listeners) Initialize this Framework.
void	start() Start this Framework.
void	start(int options) Start this Framework.
void	stop() Stop this Framework.
void	stop(int options) Stop this Framework.
void	uninstall() The Framework cannot be uninstalled.
void	update() Stop and restart this Framework.
void	update(java.io.InputStream in) Stop and restart this Framework.
FrameworkEvent	waitForStop(long timeout) Wait until this Framework has completely stopped.

Methods inherited from interface org.osgi.framework.Bundle

getBundleContext, getDataFile, getHeaders, getHeaders, getRegisteredServices, getResource, getResources, getServicesInUse, getSignerCertificates, getState, getVersion, hasPermission, loadClass

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

init

void init()
   throws BundleException

Initialize this Framework.

This method performs the same function as calling init(FrameworkListener...) with no framework listeners.

Throws:

BundleException - If this Framework could not be initialized.

java.lang.SecurityException - If the Java Runtime Environment supports permissions and the caller does not have the appropriate AdminPermission[this,EXECUTE] or if there is a security manager already installed and the Constants.FRAMEWORK_SECURITY configuration property is set.

See Also:

init(FrameworkListener...)

init

void init(FrameworkListener... listeners)
   throws BundleException

Initialize this Framework. After calling this method, this Framework must:

• Have generated a new framework UUID.
• Be in the Bundle.STARTING state.
• Have a valid Bundle Context.
• Be at start level 0.
• Have event handling enabled.
• Have reified Bundle objects for all installed bundles.
• Have registered any framework services. For example, ConditionalPermissionAdmin.
• Be adaptable to the OSGi defined types to which a system bundle can be adapted.
• Have called the start method of the extension bundle activator for all resolved extension bundles.

This Framework will not actually be started until start is called.

This method does nothing if called when this Framework is in the Bundle.STARTING, Bundle.ACTIVE or Bundle.STOPPING states.

All framework events fired by this method are also delivered to the specified FrameworkListeners in the order they are specified before returning from this method. After returning from this method the specified listeners are no longer notified of framework events.

Parameters:

listeners - Zero or more listeners to be notified when framework events occur while initializing the framework. The specified listeners do not need to be otherwise registered with the framework. If a specified listener is registered with the framework, it will be notified twice for each framework event.

Throws:

BundleException - If this Framework could not be initialized.

java.lang.SecurityException - If the Java Runtime Environment supports permissions and the caller does not have the appropriate AdminPermission[this,EXECUTE] or if there is a security manager already installed and the Constants.FRAMEWORK_SECURITY configuration property is set.

Since:

1.2

waitForStop

FrameworkEvent waitForStop(long timeout)
                    throws java.lang.InterruptedException

Wait until this Framework has completely stopped. The stop and update methods on a Framework performs an asynchronous stop of the Framework. This method can be used to wait until the asynchronous stop of this Framework has completed. This method will only wait if called when this Framework is in the Bundle.STARTING, Bundle.ACTIVE, or Bundle.STOPPING states. Otherwise it will return immediately.

A Framework Event is returned to indicate why this Framework has stopped.

Parameters:

timeout - Maximum number of milliseconds to wait until this Framework has completely stopped. A value of zero will wait indefinitely.

Returns:

A Framework Event indicating the reason this method returned. The following FrameworkEvent types may be returned by this method.

• STOPPED - This Framework has been stopped.
• STOPPED_UPDATE - This Framework has been updated which has shutdown and will now restart.
• STOPPED_SYSTEM_REFRESHED - The Framework has been stopped because of a refresh operation on the system bundle. A new class loader must be used to restart the Framework.
• ERROR - The Framework encountered an error while shutting down or an error has occurred which forced the framework to shutdown.
• WAIT_TIMEDOUT - This method has timed out and returned before this Framework has stopped.

Throws:

java.lang.InterruptedException - If another thread interrupted the current thread before or while the current thread was waiting for this Framework to completely stop. The interrupted status of the current thread is cleared when this exception is thrown.

java.lang.IllegalArgumentException - If the value of timeout is negative.

start

void start()
    throws BundleException

Start this Framework.

The following steps are taken to start this Framework:

1. If this Framework is not in the Bundle.STARTING state, initialize this Framework.
2. All installed bundles must be started in accordance with each bundle's persistent autostart setting. This means some bundles will not be started, some will be started with eager activation and some will be started with their declared activation policy. The start level of this Framework is moved to the start level specified by the beginning start level framework property, as described in the Start Level Specification. If this framework property is not specified, then the start level of this Framework is moved to start level one (1). Any exceptions that occur during bundle starting must be wrapped in a BundleException and then published as a framework event of type FrameworkEvent.ERROR
3. This Framework's state is set to Bundle.ACTIVE.
4. A framework event of type FrameworkEvent.STARTED is fired

Specified by:

start in interface Bundle

Throws:

BundleException - If this Framework could not be started.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.

See Also:

"Start Level Specification"

start

void start(int options)
    throws BundleException

Start this Framework.

Calling this method is the same as calling start(). There are no start options for the Framework.

Specified by:

start in interface Bundle

Parameters:

options - Ignored. There are no start options for the Framework.

Throws:

BundleException - If this Framework could not be started.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.

See Also:

start()

stop

void stop()
   throws BundleException

Stop this Framework.

The method returns immediately to the caller after initiating the following steps to be taken on another thread.

1. This Framework's state is set to Bundle.STOPPING.
2. All installed bundles must be stopped without changing each bundle's persistent autostart setting. The start level of this Framework is moved to start level zero (0), as described in the Start Level Specification. Any exceptions that occur during bundle stopping must be wrapped in a BundleException and then published as a framework event of type FrameworkEvent.ERROR
3. Unregister all services registered by this Framework.
4. Event handling is disabled.
5. This Framework's state is set to Bundle.RESOLVED.
6. All resources held by this Framework are released. This includes threads, bundle class loaders, open files, etc.
7. Notify all threads that are waiting at waitForStop that the stop operation has completed.

After being stopped, this Framework may be discarded, initialized or started.

Specified by:

stop in interface Bundle

Throws:

BundleException - If stopping this Framework could not be initiated.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.

See Also:

"Start Level Specification"

stop

void stop(int options)
   throws BundleException

Stop this Framework.

Calling this method is the same as calling stop(). There are no stop options for the Framework.

Specified by:

stop in interface Bundle

Parameters:

options - Ignored. There are no stop options for the Framework.

Throws:

BundleException - If stopping this Framework could not be initiated.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.

See Also:

stop()

uninstall

void uninstall()
        throws BundleException

The Framework cannot be uninstalled.

This method always throws a BundleException.

Specified by:

uninstall in interface Bundle

Throws:

BundleException - This Framework cannot be uninstalled.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,LIFECYCLE], and the Java Runtime Environment supports permissions.

See Also:

Bundle.stop()

update

void update()
     throws BundleException

Stop and restart this Framework.

The method returns immediately to the caller after initiating the following steps to be taken on another thread.

1. Perform the steps in the stop() method to stop this Framework.
2. Perform the steps in the start() method to start this Framework.

Specified by:

update in interface Bundle

Throws:

BundleException - If stopping and restarting this Framework could not be initiated.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,LIFECYCLE], and the Java Runtime Environment supports permissions.

See Also:

Bundle.update(InputStream)

update

void update(java.io.InputStream in)
     throws BundleException

Stop and restart this Framework.

Calling this method is the same as calling update() except that any provided InputStream is immediately closed.

Specified by:

update in interface Bundle

Parameters:

in - Any provided InputStream is immediately closed before returning from this method and otherwise ignored.

Throws:

BundleException - If stopping and restarting this Framework could not be initiated.

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,LIFECYCLE], and the Java Runtime Environment supports permissions.

See Also:

Bundle.stop(), Bundle.start()

getBundleId

long getBundleId()

Returns the Framework unique identifier. This Framework is assigned the unique identifier zero (0) since this Framework is also a System Bundle.

Specified by:

getBundleId in interface Bundle

Returns:

0.

See Also:

Bundle.getBundleId()

getLocation

java.lang.String getLocation()

Returns the Framework location identifier. This Framework is assigned the unique location "System Bundle" since this Framework is also a System Bundle.

Specified by:

getLocation in interface Bundle

Returns:

The string "System Bundle".

Throws:

java.lang.SecurityException - If the caller does not have the appropriate AdminPermission[this,METADATA], and the Java Runtime Environment supports permissions.

See Also:

Bundle.getLocation(), Constants.SYSTEM_BUNDLE_LOCATION

getSymbolicName

java.lang.String getSymbolicName()

Returns the symbolic name of this Framework. The symbolic name is unique for the implementation of the framework. However, the symbolic name "system.bundle" must be recognized as an alias to the implementation-defined symbolic name since this Framework is also a System Bundle.

Specified by:

getSymbolicName in interface Bundle

Returns:

The symbolic name of this Framework.

See Also:

Bundle.getSymbolicName(), Constants.SYSTEM_BUNDLE_SYMBOLICNAME

getEntryPaths

java.util.Enumeration<java.lang.String> getEntryPaths(java.lang.String path)

Returns null as a framework implementation does not have a proper bundle from which to return entry paths.

Specified by:

getEntryPaths in interface Bundle

Parameters:

path - Ignored.

Returns:

null as a framework implementation does not have a proper bundle from which to return entry paths.

getEntry

java.net.URL getEntry(java.lang.String path)

Returns null as a framework implementation does not have a proper bundle from which to return an entry.

Specified by:

getEntry in interface Bundle

Parameters:

path - Ignored.

Returns:

null as a framework implementation does not have a proper bundle from which to return an entry.

getLastModified

long getLastModified()

Returns the time when the set of bundles in this framework was last modified. The set of bundles is considered to be modified when a bundle is installed, updated or uninstalled.

The time value is the number of milliseconds since January 1, 1970, 00:00:00 UTC.

Specified by:

getLastModified in interface Bundle

Returns:

The time when the set of bundles in this framework was last modified.

findEntries

java.util.Enumeration<java.net.URL> findEntries(java.lang.String path,
                                                java.lang.String filePattern,
                                                boolean recurse)

Returns null as a framework implementation does not have a proper bundle from which to return entries.

Specified by:

findEntries in interface Bundle

Parameters:

path - Ignored.

filePattern - Ignored.

recurse - Ignored.

Returns:

null as a framework implementation does not have a proper bundle from which to return entries.

adapt

<A> A adapt(java.lang.Class<A> type)

Adapt this Framework to the specified type.

Adapting this Framework to the specified type may require certain checks, including security checks, to succeed. If a check does not succeed, then this Framework cannot be adapted and null is returned. If this Framework is not initialized, then null is returned if the specified type is one of the OSGi defined types to which a system bundle can be adapted.

Specified by:

adapt in interface Bundle

Type Parameters:

A - The type to which this Framework is to be adapted.

Parameters:

type - Class object for the type to which this Framework is to be adapted.

Returns:

The object, of the specified type, to which this Framework has been adapted or null if this Framework cannot be adapted