TopologyEvent (ONOS Java API (2.5.1))

java.lang.Object
- org.onosproject.event.AbstractEvent<TopologyEvent.Type,Topology>
- - org.onosproject.net.topology.TopologyEvent

All Implemented Interfaces:

Event<TopologyEvent.Type,Topology>
```
public class TopologyEvent
extends AbstractEvent<TopologyEvent.Type,Topology>
```
Describes network topology event.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class TopologyEvent.Type
Type of topology events.

Constructor Summary

Constructors
Constructor	Description
`TopologyEvent(TopologyEvent.Type type, Topology topology, List<Event> reasons)`	Creates an event of a given type and for the specified topology and the current time.
`TopologyEvent(TopologyEvent.Type type, Topology topology, List<Event> reasons, long time)`	Creates an event of a given type and for the specified topology and time.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

List<Event> reasons()
Returns the list of events that triggered the topology change.
- Methods inherited from class org.onosproject.event.AbstractEvent
  subject, time, toString, type
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - TopologyEvent
```
public TopologyEvent(TopologyEvent.Type type,
                     Topology topology,
                     List<Event> reasons)
```
    Creates an event of a given type and for the specified topology and the current time.
    
    Parameters:
    
    type - topology event type
    
    topology - event topology subject
    
    reasons - list of events that triggered topology change
  - TopologyEvent
```
public TopologyEvent(TopologyEvent.Type type,
                     Topology topology,
                     List<Event> reasons,
                     long time)
```
    Creates an event of a given type and for the specified topology and time.
    
    Parameters:
    
    type - link event type
    
    topology - event topology subject
    
    reasons - list of events that triggered topology change
    
    time - occurrence time
- Method Detail
  - reasons
```
public List<Event> reasons()
```
    Returns the list of events that triggered the topology change.
    
    Returns:
    
    list of events responsible for change in topology; null if initial topology computation