Data gravitation cleanup handler. Primarily used by the {@link org.jboss.cache.interceptors.DataGravitatorInterceptor}. This is not a {@link org.jboss.cache.commands.VisitableCommand} and hencenot passed up the {@link org.jboss.cache.interceptors.base.CommandInterceptor} chain.
@author Mircea.Markus@jboss.com
@since 2.2