DomainService (ONOS Java API (2.3.0))

```
public interface DomainService
```
Service to access domain topology elements.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Set<DeviceId>`	`getDeviceIds(DomainId domainId)`	Returns the set of the device ids of the specified domain.
`DomainId`	`getDomain(DeviceId deviceId)`	Returns a domain given a device id.
`java.util.Set<DomainId>`	`getDomainIds()`	Returns the set of domains that have an associated topology.

- Method Detail
  - getDomainIds
```
java.util.Set<DomainId> getDomainIds()
```
    Returns the set of domains that have an associated topology.
    
    Returns:
    
    set of domain identifiers
  - getDeviceIds
```
java.util.Set<DeviceId> getDeviceIds(DomainId domainId)
```
    Returns the set of the device ids of the specified domain.
    
    Parameters:
    
    domainId - domain identifier
    
    Returns:
    
    set of device objects
  - getDomain
```
DomainId getDomain(DeviceId deviceId)
```
    Returns a domain given a device id.
    
    Parameters:
    
    deviceId - the device id
    
    Returns:
    
    null or the domain id of a device