This interface allows Listeners on events during the life of a chain of commands. By implementing this interface a class can listen to events occurring during the processing of the context by any command that fires these events. The listener then needs to be added to the command by the relevant interface method.
$Id: ChainListener.java 182 2010-12-13 22:51:53Z georgosn $
@author $LastChangedBy: georgosn $
@version $LastChangedRevision: 182 $