| 摘要 |
A method and system are provided for performing an activity. Accordingly, an activity to be performed is determined, a stored hierarchy is examined indicating a first alternate component for performing the activity first and a second alternate component for performing the activity if the first alternate component fails. The first alternate component is invoked to perform the activity, and when a failure of the first alternate component to perform the activity is detected, the second alternate component is invoked to perform the activity. A revised hierarchy is stored indicating that the second alternate component is to be invoked to perform the activity before the first alternate component is invoked to perform the activity.
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