OSGi (Open Services Gateway Initiative) is a dynamic module system for java. It defines a component and service model where the components and services can be dynamically (de-)activated, updated and so on.
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OSGi and Dependancy Injection
OSGi does dependancy management between bundles. When a bundle is activated it loads all dependant bundles.
Bundle Status
| RESOLVED | All required dependancies in the bundle are resolved |
| INSTALLED | not resolved |
| STARTING | bundle is started |
| ACTIVE | bundle is active |
Extension Points
Eclipse Equinox extends the concept of bundles with the concept of extension points.
Eclipse OSGi Console
To access the Eclipse OSGi console:
In the console view window click on the small down arrow next to the 'Open Console' icon and click on 'Host OSGi console'
osgi> status
"Framework is launched."
id "Bundle Location"
"State Bundle File Name"
0 System Bundle
ACTIVE org.eclipse.osgi_3.10.0.v20140606-1445 [0]
1 initial@reference:file:plugins/org.eclipse.osgi.compatibility.state_1.0.0.v20140403-1907.jar
RESOLVED org.eclipse.osgi.compatibility.state_1.0.0.v20140403-1907 [1]
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37 reference:file:plugins/org.eclipse.ant.core_3.3.0.v20140518-0042.jar
STARTING org.eclipse.ant.core_3.3.0.v20140518-0042 [37]
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209 reference:file:plugins/org.eclipse.jdt.annotation_2.0.0.v20140415-1436.jar
INSTALLED org.eclipse.jdt.annotation_2.0.0.v20140415-1436 [209]
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"Registered Services"
{org.eclipse.osgi.framework.log.FrameworkLog}={service.ranking=2147483647,
service.pid=0.org.eclipse.osgi.internal.log.EquinoxLogFactory,
service.vendor=Eclipse.org - Equinox, service.id=3,
service.bundleid=0, service.scope=bundle}
{org.eclipse.osgi.service.datalocation.Location}={service.ranking=2147483647,
type=osgi.user.area,
service.pid=0.org.eclipse.osgi.internal.location.BasicLocation,
service.vendor=Eclipse.org - Equinox, service.id=5,
service.bundleid=0, service.scope=singleton}
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