com.vaadin.collaborationengine.AbstractCollaborationManager.ActivationHandler API 23.1.17 | Vaadin

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com.vaadin.collaborationengine.

All Superinterfaces:

Serializable

Enclosing class:

AbstractCollaborationManager

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public static interface AbstractCollaborationManager.ActivationHandler
extends Serializable
```
The callback executed when the manager is activated, i.e. when the connection to the topic is established.

See Also:

AbstractCollaborationManager.setActivationHandler(ActivationHandler)

- Method Summary
  
  All Methods
  Modifier and Type Method Description
  
  Registration onActivation()
  The method executed when the manager is activated.

- Method Detail
  - onActivation
```
Registration onActivation()
```
    The method executed when the manager is activated. The method might return a callback which will be invoked when the manager is deactivated, i.e. the connection to the topic is closed. This callback can be used to clean-up resources used during activation.
    
    Returns:
    
    a callback which will be executed when the manager is deactivated, or null if not needed