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

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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