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## com.google.appengine.tools.admin
Interface UpdateListener

    public interface UpdateListener

A listener which receives events during a long running operation that involves interaction with the server. Implement this interface to be notified of progress during application update.

Method Summary
`void` | `onFailure(UpdateFailureEvent event)` Called if the operation has failed.
`void` | `onProgress(UpdateProgressEvent event)` Called each time some progress is made during the operation.
`void` | `onSuccess(UpdateSuccessEvent event)` Called if the operation has completed successfully.

Method Detail

### onProgress

    void onProgress(UpdateProgressEvent event)

  Called each time some progress is made during the operation.

  Parameters:
    `event` - a not `null` event.

### onSuccess

    void onSuccess(UpdateSuccessEvent event)

  Called if the operation has completed successfully.

  Parameters:
    `event` - a not `null` event.

### onFailure

    void onFailure(UpdateFailureEvent event)

  Called if the operation has failed.

  Parameters:
    `event` - a not `null` event.

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