InstanceStateListener (Apache Felix iPOJO 1.12.1 API)

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All Known Implementing Classes:

ArchitectureHandler, HandlerManager, InstanceDescription, InstanceManager, PrimitiveInstanceDescription
```
public interface InstanceStateListener
```
This class defines instance state listeners. An instance state listener is notified of instance state changes. It needs to be registered on the instance by invoking the (ComponentInstance.addInstanceStateListener(InstanceStateListener) method. Once registered, the listener can track instance state changes. Received states are:
ComponentInstance.VALID
ComponentInstance.INVALID
ComponentInstance.STOPPED
ComponentInstance.DISPOSED

Author:: Felix Project Team

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`stateChanged(ComponentInstance instance, int newState)` State change listener callback method.

- Method Detail
  - stateChanged
```
void stateChanged(ComponentInstance instance,
                  int newState)
```
    State change listener callback method. Every time that a monitored instance's state changes, this method is called with the instance and the new state.
    
    Parameters:
    
    instance - the changing instance
    
    newState - the new instance state

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