OSGi Library Bundle
The OSGi Library Bundle holds a library with the basic OSGi Service APIs. The
bundle itself has no functionality, it just exports API packages that can be
implemented by other bundles in the OSGi framework. The bundles that should
implement interfaces from the OSGi Library Bundle may import them instead of
defining and then exporting them for the use of other bundles.
The interfaces, exported by the OSGi Library Bundle are used by many bundles.
By exporting those interfaces, all client (importer) bundles can be resolved,
without the necessity to load the bundles, which implement these interfaces.
For example, as UserAdmin Bundle is not crucial for the proper functioning of
the HTTP Bundle and as org.osgi.service.useradmin package is exported
by the OSGi Library Bundle, it is not necessary to install and start the UserAdmin
Bundle, in order to start the HTTP Bundle. So, if a lack of system resources
suggests decrease of memory load or simply the scenario in which the framework
is used does not require a specific bundle, each of the OSGi bundles may not be included from
your configuration of bundles on a target device.
There is a set of bundles, each of them exporting a single OSGi API. These
bundles are: CM API, Device API, HTTP API, Log API, MetaType API, Preferences
API, User Management API, Service Tracker API, and Java Servlet API. Their purpose
is the one explained above - when the framework configuration requires a little
set of the OSGi APIs, they can be selected by any package, and the OSGi Library
Bundle can be excluded from the configuration.
Bundle Information
Bundle JAR
The JAR file of the OSGi Library Bundle is osgilib.jar,
and it is found in the bundles folder.
Import
The OSGi Library Bundle imports no packages.
Export
The OSGi Library Bundle exports the following packages:
| Package |
Description |
org.mbs.eventadmin |
Holds an event pool utility for optimized creation of event objects. |
javax.servlet and javax.servlet.http |
Hosts the components of the Java Servlet API 2.2 developed
by Sun Microsystems. |
javax.servlet.jsp |
Contains classes of the JSP technology, developed by Sun Microsystems, used by each JSP class. |
javax.servlet.jsp.tagext |
Contains components necessary for using tag libraries into the developed JSP pages. |
org.osgi.service.cm |
Contains interfaces for administering, processing and
receiving configuration data as defined in the OSGi Configuration
Admin Service Specification. These interfaces are implemented by the
Config Bundle. |
org.osgi.service.device |
Holds the main components, defined by the OSGi Device Access Specification. These components are supported and managed by the Device Manager Bundle. |
org.osgi.service.eventadmin |
Contains interfaces for subscribing for and generating events as described in the OSGi Event Admin Service Specification, implemented by the Event Admin bundle. |
org.osgi.service.http |
Holds the basic components that are defined by the OSGi HTTP Service Specification, the Http Service is implemented by the HTTP Bundle. |
org.osgi.service.metatype |
Shares interfaces through which an attribute can be
described, they also provide access to meta types and description
for the data type information of an objectclass. The package usage
terms are specified in the OSGi Metatype Specification. |
org.osgi.service.log |
Holds the basic components, defined by the OSGi Log
Service Specification, the Log Service is implemented by the
Log Bundle. |
org.osgi.service.prefs |
Shares the interfaces for management and access to preferences
data defined in the OSGi Preferences Service Specification, implemented
by the Preferences Bundle. |
org.osgi.service.provisioning |
Conatins the interfaces for initial provisioning of the OSGi platform for control by a remote management system. |
org.osgi.service.useradmin |
Holds the basic components that are defined by the
OSGi User Admin Specification, implemented by the User
Admin Bundle. |
prg.osgi.service.wireadmin |
Contains the The OSGi Wire Admin Service API. |
org.osgi.util.measurement |
Holds utilties for measuring states and units. |
org.osgi.util.position |
Represents geographic locations. |
org.osgi.util.tracker |
Provides a utility, defined by the OSGi Service Tracker
Specification, which simplifies using services from the Framework's
service registry. |
|
Configuration
The bundle has no user-definable properties for configuration.
References
Refer to the OSGi
Service Platform Service Compendium.
OSGi Bundles