Extension (Apache jclouds 2.4.0 API)

```
@Retention(RUNTIME)
@Target({TYPE,FIELD,PARAMETER,METHOD})
@Qualifier
public @interface Extension
```
An extension of a service. In order for us to understand the context of the extension, we must consider the extensions call.
For our purposes, the minimal context of an extension is the type of the service it extends ex. ServiceType#COMPUTE, and its namespace ex. http://docs.openstack.org /ext/keypairs/api/v1.1.

A keystone extension example:

{
"updated": "2014-12-03T00:00:00Z",
"name": "DiskConfig",
"links": [

],
"namespace": "http://docs.openstack.org/compute/ext/fake_xml",
"alias": "OS-DCF",
"description": "Disk Management Extension."
},

See Also:

ServiceType, , ,

Required Element Summary

Required Elements
Modifier and Type Required Element Description

String namespace
namespace ex.

String of
the service type this is an extension of.

Optional Element Summary

Optional Elements
Modifier and Type Optional Element Description

String alias

String name

- Element Detail
  - of
```
String of
```
    the service type this is an extension of.
    note
    This isn't necessarily one of the built-in services, it could be an extension of a custom service.
    
    Returns:
    
    the service type this is an extension of.
- - namespace
```
String namespace
```
    namespace ex. http ://docs.openstack.org /ext/keypairs/api/v1.1.
    
    Returns:
    
    the namespace of the extension
- - name
```
String name
```
    Returns:
    
    the name of the extension
    
    Default:
    
    ""
- - alias
```
String alias
```
    Returns:
    
    the alias of the extension
    
    Default:
    
    ""