Computer Science Technical Reports Computer Science 8-4-2014 Modular Reasoning in the Presence of Event Subtyping Mehdi Bagherzadeh Iowa State University,
[email protected] Robert Dyer Bowling Green State University,
[email protected] Rex D. Fernando University of Wisconsin - Madison,
[email protected] Hridesh Rajan Iowa State University,
[email protected] Jose Sanchez University of Central Florida,
[email protected] Follow this and additional works at: http://lib.dr.iastate.edu/cs_techreports Part of the Programming Languages and Compilers Commons Recommended Citation Bagherzadeh, Mehdi; Dyer, Robert; Fernando, Rex D.; Rajan, Hridesh; and Sanchez, Jose, "Modular Reasoning in the Presence of Event Subtyping" (2014). Computer Science Technical Reports. 363. http://lib.dr.iastate.edu/cs_techreports/363 This Article is brought to you for free and open access by the Computer Science at Iowa State University Digital Repository. It has been accepted for inclusion in Computer Science Technical Reports by an authorized administrator of Iowa State University Digital Repository. For more information, please contact
[email protected]. Modular Reasoning in the Presence of Event Subtyping Abstract Separating crosscutting concerns while preserving modular reasoning is challenging. Type-based interfaces (event types) separate modularized crosscutting concerns (observers) and traditional object-oriented concerns (subjects). Event types paired with event specifications have been shown to be effective in enabling modular reasoning about subjects and observers. Similar to class subtyping there are benefits ot organizing event types into subtyping hierarchies. However, unrelated behaviors of observers and their arbitrary execution orders could cause unique, somewhat counterintuitive, reasoning challenges in the presence of event subtyping. These challenges threaten both tractability of reasoning and reuse of event types.