Package org.apache.sling.discovery
Interface TopologyEventListener
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public interface TopologyEventListener
TheTopologyEventListener
service interface may be implemented by components interested in being made aware of changes in the topology.Upon registration and whenever changes in the topology occur, this service is informed.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
handleTopologyEvent(TopologyEvent event)
Inform the service about an event in the topology - or in the discovery of the topology.
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Method Detail
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handleTopologyEvent
void handleTopologyEvent(TopologyEvent event)
Inform the service about an event in the topology - or in the discovery of the topology.Implementors of this method must ensure that this method returns quickly and that no locks are being acquired that could cause deadlocks (ie the framework might call this method holding locks).
The
TopologyEvent
contains details about what changed. The supported event types are:TOPOLOGY_INIT
sent when theTopologyEventListener
was first bound to the discovery service - represents the initial state of the topology at that time.TOPOLOGY_CHANGING
sent when the discovery service discovered a change in the topology and has started to settle the change. This event is sent beforeTOPOLOGY_CHANGED
but is optionalTOPOLOGY_CHANGED
sent when the discovery service discovered a change in the topology and has settled it.PROPERTIES_CHANGED
sent when the one or many properties have changed in an instance in the current topology
- Parameters:
event
- The topology event
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