Defines a callback, an object which is used to invoke or reinvoke a method on an object or component in a later request cycle. This is used to allow certain operations (say, submitting an order) to defer to other processes (say, logging in and/or registerring).
Callbacks must be {@link Serializable}, to ensure that they can be stored between request cycles.
@version $Id: ICallback.java 243791 2004-02-19 17:38:13Z hlship $
@author Howard Lewis Ship
@since 0.2.9
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