Difference between revisions of "OSGi Concepts Services"
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package cs.ecl.osgi.simple.declarativeservice.say; | package cs.ecl.osgi.simple.declarativeservice.say; | ||
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public interface Sayable { | public interface Sayable { | ||
Revision as of 15:31, 21 January 2011
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OSGi Services
- A bundles can register and use services in OSGi. OSGi provides therefore a central registry for this purpose. A service is defined by a Java interface (POJI - Plain Old Java Interface) [1].
- Access to the service registry is performed via the class BundleContext. OSGi injects the BundleContext into each bundle during the startup of the bundle. A bundle can also register itself to the BundleContext ServiceEvents which are for example triggered if a new service is installed or de-installed.
For example, let us suppose that one wants to define a service that is capable to define the day and time. For the purpose one defines an interface:
package cs.ecl.osgi.simple.declarativeservice.say;
public interface Sayable {
String say();
}