Abstract
Software runtime adaptability is one of the desired quality attributes in modern business process systems. It helps satisfy a variety of users' needs and accommodate diverse business and technical changes, both in the running software and its operating environment. In this paper, we present and demonstrate the application of our adaptation middleware MiniMASC+MiniZinc to business processes designed and implemented using the REpresentational State Transfer (REST) architectural style. We extended MiniMASC+MiniZinc with new autonomic businessdriven decision making algorithms to determine which process fragment to execute in a decision point of a RESTful business process. Our new decision making algorithms enable different adaptation decisions for different classes of consumer at runtime depending on business strategies, in a way that achieves maximum overall business value while satisfying all given constraints. We demonstrate the new decision making algorithms in a LIXI (Lending Industry XML Initiative)-compliant loan application process system that was implemented using the REST principles. Categories and Subject Descriptors H.1.0 [Information Systems]: Models and Principles - General; H.3.5 [Information Storage and Retrieval]: Online Information Services - Web-based services. General Terms Algorithms, Management Keywords Business-driven IT management, software adaptation, REST, business process management, middleware, autonomic computing 1. I#TRODUCTIO# A#D MOTIVATIO# Software runtime adaptability [1] as the ability of a software system to change its functionality during runtime is one of the desired quality attributes in modern business process systems. To improve runtime adaptability of software implementing business processes, we previously adapted the REpresentational State Transfer (REST) principles [2] (used in the World Wide Web - Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, or republish, to post on