org.osgi.service.packageadmin
Interface PackageAdmin

public interface PackageAdmin

Framework service which allows bundle programmers to inspect the package wiring state of bundles in the Framework as well as other functions related to the class loader network among bundles.

If present, there will only be a single instance of this service registered with the Framework.

See Also:

ExportedPackage, RequiredBundle

Field Summary

static int

BUNDLE_TYPE_FRAGMENT Bundle type indicating the bundle is a fragment bundle.

Method Summary

Bundle	getBundle(java.lang.Class clazz) Returns the bundle from which the specified class is loaded.
Bundle[]	getBundles(java.lang.String symbolicName, java.lang.String versionRange) Returns the bundles with the specified symbolic name whose bundle version is within the specified version range.
int	getBundleType(Bundle bundle) Returns the special type of the specified bundle.
ExportedPackage	getExportedPackage(java.lang.String name) Gets the exported package for the specified package name.
ExportedPackage[]	getExportedPackages(Bundle bundle) Gets the exported packages for the specified bundle.
ExportedPackage[]	getExportedPackages(java.lang.String name) Gets the exported packages for the specified package name.
Bundle[]	getFragments(Bundle bundle) Returns an array of attached fragment bundles for the specified bundle.
Bundle[]	getHosts(Bundle bundle) Returns an array containing the host bundle to which the specified fragment bundle is attached or null if the specified bundle is not attached to a host or is not a fragment bundle.
RequiredBundle[]	getRequiredBundles(java.lang.String symbolicName) Returns an array of required bundles having the specified symbolic name.
void	refreshPackages(Bundle[] bundles) Forces the update (replacement) or removal of packages exported by the specified bundles.
boolean	resolveBundles(Bundle[] bundles) Resolve the specified bundles.

Field Detail

BUNDLE_TYPE_FRAGMENT

public static final int BUNDLE_TYPE_FRAGMENT

Bundle type indicating the bundle is a fragment bundle.

The value of BUNDLE_TYPE_FRAGMENT is 0x00000001.

Since:

1.2

See Also:

Constant Field Values

Method Detail

getExportedPackages

public ExportedPackage[] getExportedPackages(Bundle bundle)

Gets the exported packages for the specified bundle.

Parameters:

bundle - The bundle whose exported packages are to be returned, or null if all exported packages are to be returned. If the specified bundle is the system bundle (that is, the bundle with id zero), this method returns all the packages known to be exported by the system bundle. This will include the package specified by the org.osgi.framework.system.packages system property as well as any other package exported by the framework implementation.

Returns:

An array of exported packages, or null if the specified bundle has no exported packages.

getExportedPackages

public ExportedPackage[] getExportedPackages(java.lang.String name)

Gets the exported packages for the specified package name.

Parameters:

name - The name of the exported packages to be returned.

Returns:

An array of the exported packages, or null if no exported packages with the specified name exists.

Since:

1.2

getExportedPackage

public ExportedPackage getExportedPackage(java.lang.String name)

Gets the exported package for the specified package name.

If there are multiple exported packages with specified name, the exported package with the highest version will be returned.

Parameters:

name - The name of the exported package to be returned.

Returns:

The exported package, or null if no exported package with the specified name exists.

See Also:

getExportedPackages(String)

refreshPackages

public void refreshPackages(Bundle[] bundles)

Forces the update (replacement) or removal of packages exported by the specified bundles.

If no bundles are specified, this method will update or remove any packages exported by any bundles that were previously updated or uninstalled since the last call to this method. The technique by which this is accomplished may vary among different Framework implementations. One permissible implementation is to stop and restart the Framework.

This method returns to the caller immediately and then performs the following steps on a separate thread:

1. Compute a graph of bundles starting with the specified bundles. If no bundles are specified, compute a graph of bundles starting with bundle updated or uninstalled since the last call to this method. Add to the graph any bundle that is wired to a package that is currently exported by a bundle in the graph. The graph is fully constructed when there is no bundle outside the graph that is wired to a bundle in the graph. The graph may contain UNINSTALLED bundles that are currently still exporting packages.
2. Each bundle in the graph that is in the ACTIVE state will be stopped as described in the Bundle.stop method.
3. Each bundle in the graph that is in the RESOLVED state is unresolved and thus moved to the INSTALLED state. The effect of this step is that bundles in the graph are no longer RESOLVED.
4. Each bundle in the graph that is in the UNINSTALLED state is removed from the graph and is now completely removed from the Framework.
5. Each bundle in the graph that was in the ACTIVE state prior to Step 2 is started as described in the Bundle.start method, causing all bundles required for the restart to be resolved. It is possible that, as a result of the previous steps, packages that were previously exported no longer are. Therefore, some bundles may be unresolvable until another bundle offering a compatible package for export has been installed in the Framework.
6. A framework event of type FrameworkEvent.PACKAGES_REFRESHED is fired.

For any exceptions that are thrown during any of these steps, a FrameworkEvent of type ERROR is fired containing the exception. The source bundle for these events should be the specific bundle to which the exception is related. If no specific bundle can be associated with the exception then the System Bundle must be used as the source bundle for the event.

Parameters:

bundles - The bundles whose exported packages are to be updated or removed, or null for all bundles updated or uninstalled since the last call to this method.

Throws:

java.lang.SecurityException - If the caller does not have AdminPermission[System Bundle,RESOLVE] and the Java runtime environment supports permissions.

resolveBundles

public boolean resolveBundles(Bundle[] bundles)

Resolve the specified bundles. The Framework must attempt to resolve the specified bundles that are unresolved. Additional bundles that are not included in the specified bundles may be resolved as a result of calling this method. A permissible implementation of this method is to attempt to resolve all unresolved bundles installed in the framework.

If null is specified then the Framework will attempt to resolve all unresolved bundles. This method must not cause any bundle to be refreshed, stopped, or started. This method will not return until the operation has completed.

Parameters:

bundles - The bundles to resolve or null to resolve all unresolved bundles installed in the Framework.

Returns:

true if all specified bundles are resolved;

Throws:

java.lang.SecurityException - If the caller does not have AdminPermission[System Bundle,RESOLVE] and the Java runtime environment supports permissions.

Since:

1.2

getRequiredBundles

public RequiredBundle[] getRequiredBundles(java.lang.String symbolicName)

Returns an array of required bundles having the specified symbolic name.

If null is specified, then all required bundles will be returned.

Parameters:

symbolicName - The bundle symbolic name or null for all required bundles.

Returns:

An array of required bundles or null if no required bundles exist for the specified symbolic name.

Since:

1.2

getBundles

public Bundle[] getBundles(java.lang.String symbolicName,
                           java.lang.String versionRange)

Returns the bundles with the specified symbolic name whose bundle version is within the specified version range. If no bundles are installed that have the specified symbolic name, then null is returned. If a version range is specified, then only the bundles that have the specified symbolic name and whose bundle versions belong to the specified version range are returned. The returned bundles are ordered by version in descending version order so that the first element of the array contains the bundle with the highest version.

Parameters:

symbolicName - The symbolic name of the desired bundles.

versionRange - The version range of the desired bundles, or null if all versions are desired.

Returns:

An array of bundles with the specified name belonging to the specified version range ordered in descending version order, or null if no bundles are found.

Since:

1.2

See Also:

Constants.BUNDLE_VERSION_ATTRIBUTE

getFragments

public Bundle[] getFragments(Bundle bundle)

Returns an array of attached fragment bundles for the specified bundle. If the specified bundle is a fragment then null is returned. If no fragments are attached to the specified bundle then null is returned.

This method does not attempt to resolve the specified bundle. If the specified bundle is not resolved then null is returned.

Parameters:

bundle - The bundle whose attached fragment bundles are to be returned.

Returns:

An array of fragment bundles or null if the bundle does not have any attached fragment bundles or the bundle is not resolved.

Since:

1.2

getHosts

public Bundle[] getHosts(Bundle bundle)

Returns an array containing the host bundle to which the specified fragment bundle is attached or null if the specified bundle is not attached to a host or is not a fragment bundle. A fragment may only be attached to a single host bundle.

Parameters:

bundle - The bundle whose host bundle is to be returned.

Returns:

An array containing the host bundle or null if the bundle does not have a host bundle.

Since:

1.2

getBundle

public Bundle getBundle(java.lang.Class clazz)

Returns the bundle from which the specified class is loaded. The class loader of the returned bundle must have been used to load the specified class. If the class was not loaded by a bundle class loader then null is returned.

Parameters:

clazz - The class object from which to locate the bundle.

Returns:

The bundle from which the specified class is loaded or null if the class was not loaded by a bundle class loader.

Since:

1.2

getBundleType

public int getBundleType(Bundle bundle)

Returns the special type of the specified bundle. The bundle type values are:

• BUNDLE_TYPE_FRAGMENT

A bundle may be more than one type at a time. A type code is used to identify the bundle type for future extendability.

If a bundle is not one or more of the defined types then 0x00000000 is returned.

Parameters:

bundle - The bundle for which to return the special type.

Returns:

The special type of the bundle.

Since:

1.2