All Known Implementing Classes:

DefaultActiveTransformation
```
public interface ActiveTransformation
```
Class responsible to interact with the active transformation.

Since:

2023.1.0

Author:

Sara Pellegrini

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`CompletableFuture<EventTransformation>`	`cancel()`	Cancels the active transformation.
`CompletableFuture<EventTransformation>`	`startApplying()`	Requests the transformation to be applied.
`CompletableFuture<ActiveTransformation>`	`transform(Transformer transformer)`	Accepts a `Transformer` to collect the requested changes and to register them into the active transformation.

- Method Detail
  - transform
```
CompletableFuture<ActiveTransformation> transform(Transformer transformer)
```
    Accepts a Transformer to collect the requested changes and to register them into the active transformation.
    
    Parameters:
    
    transformer - the Transformer used to append the required changes to the active transformation
    
    Returns:
    
    a CompletableFuture of the active transformation that completes when all changes have been registered.
  - startApplying
```
CompletableFuture<EventTransformation> startApplying()
```
    Requests the transformation to be applied. After this method is invoked, it will not be possible to cancel the transformation or to register new changes in it. Axon Server will asynchronously apply the transformation to the event store, making the changes effective. The returned CompletableFuture completes when the request to start applying has been received form AS, it does not wait the apply process is completed. Depending on the number of transformation actions contained in the transformation, the apply process can take a long time before to be completed.
    
    Returns:
    
    a CompletableFuture of the Event Transformation, that completes only after the start applying request has been received by AS.
  - cancel
```
CompletableFuture<EventTransformation> cancel()
```
    Cancels the active transformation. After this method is invoked, it will not be possible to apply the transformation or to register new changes in it.
    
    Returns:
    
    a CompletableFuture of the Event Transformation, that completes only after the cancel request has been received by AS.

Interface ActiveTransformation

Method Summary

Method Detail

transform

startApplying

cancel