Plugin Descriptor Metadata
Define the resource type in the plugin descriptor, specifying general information on the resource type such as name and description.
Specify the name of the class that will be used to discover resources of this type.
Specify the name of the class that will be used to connect to and provide hooks for any subsystems in use.
Add metadata to describe which subsystems the plugin will support for the resource type, such as indicating what properties may be used to configure the resource or what operations may be executed.

Code Implementations
Implement the class that will perform discovery of resources (the name of this class is indicated in the metadata above).
Implement the class that will connect to the resource (resource component). There will be one instantiation of this class for each resource of this type that is discovered.
Implement the required interfaces on the resource component for each subsystem indicated in use by the plugin descriptor. In other words, if the plugin descriptor indicates the resource can be configured, the configuration interface must be implemented by the resource component for this resource type.