| # Topology Manager |
| |
| Listens to local services and decides which to expose. It can also add properties to change the way services are exposed. |
| For the services to be exported it calls RemoteServiceAdmin.exportService to do the actual export. Then notifies |
| EndpointListeners about the new Endpoint. |
| Listens for service requests from consumers and creates EndpointListeners for these interests. |
| |
| The TopologyManager by default exposes all suitably marked local services for export and imports all service interests |
| with matching remote Endpoints. |
| |
| ## ExportPolicy |
| |
| This behaviour can be customized by exposing a service implementing the [ExportPolicy interface](https://github.com/apache/aries-rsa/blob/master/spi/src/main/java/org/apache/aries/rsa/spi/ExportPolicy.java). |
| It can be used to implement system-wide governance rules. |
| |
| Some examples what could be done: |
| |
| * Enhancing all exposed remote endpoints with SSL, basic auth, logging |
| * Exporting OSGi services with annotations for JAX-WS or JAX-RS even when not specially marked for export |
| |
| According to its role the TopologyManager does not directly implement the enhancements above. It simply enhances the |
| service properties and creates the necessary calls to a suitable RemoteServiceAdmin. |
