The following example illustrates the usage of the extended metatype support, and in particular of the Metadata Manager service.

The example consists of the several parts:

• A metadata management applications, which introduces the "Server" metadata type, processes available metadata and prints the result through the log utility of the OSGi Runtime.
• A provider of metadata in the form of an XML file.
• A provider of metadata in the form of a MetaTypeProvider service.

1. MetaTypeProvider Implementation

   Metadata can be defined as a Metatype Provider service in the OSGi framework. Following is an example provider for the "Server" type, which defines a client application.

2. Management Metadata Plugin

   The ServerMetadataPlugin class combines the functionality of a Metadata Plugin – it registers an com.prosyst.mbs.services.metatype.MetaDataPlugin, and of a metadata management application – it listens for changed XML-defined metadata and for Metatype Provider services with registration property "metadata.type" equal to "Server". On detecting changes, the ServerMedataPlugin class checks the "isServer" and "port" attributes and logs the result.

3. XML-Based Metadata

   This chapter contains an example for defining metadata in an XML file. Shown XML metadata is of the "Server" type and indicates that this is a server application.