Meta workflows as a control and coordination mechanism for exception handling in workflow systems

2005 ◽  
Vol 40 (1) ◽  
pp. 89-105 ◽  
Author(s):  
Akhil Kumar ◽  
Jacques Wainer
Keyword(s):  
Exception Handling ◽  
Coordination Mechanism ◽  
Workflow Systems

W-RBAC — A Workflow Security Model Incorporating Controlled Overriding of Constraints

2003 ◽  
Vol 12 (04) ◽  
pp. 455-485 ◽  
Author(s):  
Jacques Wainer ◽  
Paulo Barthelmess ◽  
Akhil Kumar
Keyword(s):  
Exception Handling ◽  
Preference Ranking ◽  
Role Based Access Control ◽  
Security Model ◽  
Workflow Systems ◽  
Basic Model ◽  
Access Control Models ◽  
Role Based ◽  
Workflow Tasks ◽  
Selection Of

This paper presents a pair of role-based access control models for workflow systems, collectively known as the W-RBAC models. The first of these models, W0-RBAC is based on a framework that couples a powerful RBAC-based permission service and a workflow component with clear separation of concerns for ease of administration of authorizations. The permission service is the focus of the work, providing an expressive logic-based language for the selection of users authorized to perform workflow tasks, with preference ranking. W1-RBAC extends the basic model by incorporating exception handling capabilities through controlled and systematic overriding of constraints.

Flexibility and Security of Careflow Systems Modeled by Petri Nets

2011 ◽  
pp. 84-111
Author(s):  
Boleslaw Mikolajczak
Keyword(s):  
Petri Nets ◽  
Cutaneous Melanoma ◽  
Conceptual Modeling ◽  
Behavioral Flexibility ◽  
Exception Handling ◽  
Colored Petri Nets ◽  
Healthcare Industry ◽  
Workflow Systems ◽  
Behavioral Features ◽  
Multi Level

The purpose of this chapter is to present an interplay of two important structural and behavioral features of robust intelligence in careflow systems, called flexibility and multi-level security. The chapter deals with design and analysis of careflow systems, i.e. workflow systems with applications in broadly understood healthcare industry. The authors focus on providing a robust intelligence to such systems in a form of structural and behavioral flexibility. They analyze several forms of design and run-time flexibility. However, the authors focus on case handling systems, exception handling, and on careflow systems with sub-processes called worklets. They also present how to model multi-level security within careflow systems that already have desired forms of flexibility. This implies that flexibility and security are conceptually independent and can therefore be modeled with Petri nets separately and incrementally in sequential order, first flexibility and then security. The authors apply Petri nets and colored Petri nets as conceptual modeling tool. They use example of Cutaneous Melanoma (CM) to illustrate some of our considerations.

JAVASCRIPT ASYNCHRONOUS PROGRAMMING

2019 ◽  
Vol 128 (2B) ◽  
pp. 5-16
Author(s):  
Tran Thanh Luong ◽  
Le My Canh
Keyword(s):  
Design Patterns ◽  
Source Code ◽  
Object Oriented ◽  
Exception Handling ◽  
Code Smells ◽  
Asynchronous Programming ◽  
Event Driven ◽  
Programming Patterns ◽  
The Impact

JavaScript has become more and more popular in recent years because its wealthy features as being dynamic, interpreted and object-oriented with first-class functions. Furthermore, JavaScript is designed with event-driven and I/O non-blocking model that boosts the performance of overall application especially in the case of Node.js. To take advantage of these characteristics, many design patterns that implement asynchronous programming for JavaScript were proposed. However, choosing a right pattern and implementing a good asynchronous source code is a challenge and thus easily lead into less robust application and low quality source code. Extended from our previous works on exception handling code smells in JavaScript and exception handling code smells in JavaScript asynchronous programming with promise, this research aims at studying the impact of three JavaScript asynchronous programming patterns on quality of source code and application.

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