Callback (GWT Javadoc)

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## com.google.gwt.core.client
Interface Callback<T,F>

Type Parameters:
  `T` - The type returned on success
  `F` - The type returned on failure

    public interface Callback<T,F>

A callback for any asynchronous call that can result in success or failure.

Method Summary
`void` | `onFailure(F reason)` Called when an asynchronous call fails to complete normally.
`void` | `onSuccess(T result)` Called when an asynchronous call completes successfully.

Method Detail

### onFailure

    void onFailure(F reason)

  Called when an asynchronous call fails to complete normally.

  Parameters:
    `reason` - failure encountered

### onSuccess

    void onSuccess(T result)

  Called when an asynchronous call completes successfully.

  Parameters:
    `result` - the value returned

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