OpenFlowSwitchListener

```
public interface OpenFlowSwitchListener
```
Allows for providers interested in Switch events to be notified.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`portChanged(Dpid dpid, org.projectfloodlight.openflow.protocol.OFPortStatus status)`	Notify that a port has changed.
`void`	`receivedRoleReply(Dpid dpid, RoleState requested, RoleState response)`	Notify that a role imposed on a switch failed to take hold.
`void`	`switchAdded(Dpid dpid)`	Notify that the switch was added.
`void`	`switchChanged(Dpid dpid)`	Notify that the switch has changed in some way.
`void`	`switchRemoved(Dpid dpid)`	Notify that the switch was removed.

- Method Detail
  - switchAdded
```
void switchAdded(Dpid dpid)
```
    Notify that the switch was added.
    
    Parameters:
    
    dpid - the switch where the event occurred
  - switchRemoved
```
void switchRemoved(Dpid dpid)
```
    Notify that the switch was removed.
    
    Parameters:
    
    dpid - the switch where the event occurred.
  - switchChanged
```
void switchChanged(Dpid dpid)
```
    Notify that the switch has changed in some way.
    
    Parameters:
    
    dpid - the switch that changed
  - portChanged
```
void portChanged(Dpid dpid,
                 org.projectfloodlight.openflow.protocol.OFPortStatus status)
```
    Notify that a port has changed.
    
    Parameters:
    
    dpid - the switch on which the change happened.
    
    status - the new state of the port.
  - receivedRoleReply
```
void receivedRoleReply(Dpid dpid,
                       RoleState requested,
                       RoleState response)
```
    Notify that a role imposed on a switch failed to take hold.
    
    Parameters:
    
    dpid - the switch that failed role assertion
    
    requested - the role controller requested
    
    response - role reply from the switch