Metrics for BPEL process context-independency analysis

Although service-orientation (SO) and its associated computing paradigm, service-oriented computing (SOC), is becoming an increasingly popular paradigm for the implementation

of enterprise software systems, SO software applications are often designed in an ad hoc manner, with little consideration given to the underlying design structures, thereby potentially resulting in decreased maintainability of the produced software. Early prediction of design principles is desirable given that software maintenance has long been regarded as one of the most resource-consuming development phases.

BPEL processes are workflow-oriented composite services for SO solutions. Rapidly changing environment and turbulent market conditions require flexible BPEL processes to adapt with several modifications during their life cycles. Such adaptability and flexibility require the low degree of dependency or coupling between a BPEL process and its surrounding environment. In fact, heavy coupling and context dependency with partners provoke several undesirable drawbacks such as poor understandability, inflexibility,
inadaptability, and defects. This paper is to propose metrics at the design phase to measure BPEL process context independency. With the aid of these metrics, the architect
could analyze and control the context independency of a BPEL process quantitatively. To validate the metrics, authors collected a data set consisting 70 BPEL processes and also
gathered the expert’s rating (IBM SPSS) of context independency through conducting a controlled experiment. The obtained results  (IBM SPSS) reveal that there exists a high statistical correlation between the proposed metrics and the expert’s judgment of context

The project leaded to this publication started by Alireza Khoshkbarforoushha in 2006 then becomes one of the projects that have been handled by ASER group.

Preliminary contributions of authors on the proposed subject matter of this paper presented in conferences are as follows:

  • A. Khoshkbarforoushha, R. Tabein, P. Jamshidi, F. Shams, Towards a Metrics Suite for Measuring Composite Service Granularity Level Appropriateness, 6th World Congress on Services (SERVICES-I), 2010. [PDF]
  • A. Khoshkbarforoushha, P. Jamshidi, A. Nikravesh, S. Khoshnevis, F. Shams, A Metric for Measuring BPEL Process Context-Independency, IEEE International Conference on Service-Oriented Computing and Applications (SOCA’09), 2009. invited to be extend for SOCA Journal[PDF]
  • A. Khoshkbarforoushha, P. Jamshidi, F. Shams, A Metric for BPEL Process Reusability Analysis, International Workshop on Emerging Trends in Software Metrics (WETSoM’10), ICSE 2010, Cape Town, South Africa. [PDF]

In addition, a technical report regarding the overall contribution of the project has been reported in the following manuscript:

  • A. Khoshkbarforoushha, P. Jamshidi, M. Fahmideh, A. Nikravesh, F. Shams, A Metric Suite For Measuring Composite Service Granularity, Technical Report, Automated Software Engineering Research Group, Faculty of Electrical & Computer Engineering, Shahid Beheshti University GC, Tehran, Iran, May 2011. [PDF] (in persian language)

The overall contribution went through 3 major and 1 minor revisions and finally has been accepted in Springer Service-Oriented Computing and Applications (SOCA). The editor and reviewers provide us comprehensive and constructive comments that made the final manuscript much more elaborated than the first submission.

Some part of the project has been inspired by constructive and through comments of Mikhail Perepletchikov and James Noble.

For those who are interested in the details of the collected data and our empirical analysis, we refer them to the online appendix of the published paper.


Enhancing the OPEN Process Framework with Service-Oriented Method Fragments

Accepted for publication in Software and Systems Modeling (SoSyM) springer journal.

The evolution of enterprise software applications and especially their shift toward service-oriented paradigm demands new ways of architecting systems that we now call service-oriented systems. Several new methodologies or extension of existing ones based on the concept of service and better fitting the current development situations have been proposed and still are under development and experimentation.

The area of method engineering has been researched extensively in the last two decades. Indeed, method engineering has introduced a number of key notions: the product and process aspects of methods, meta-modeling, CAME, method rationale, Situational Method Engineering (SME) etc. In the research community Method Engineering (ME) principles have been promoted as a way to make software development methods agile and adaptable to particular circumstances of a development team and project.

The main audiences of our research reported in this paper are those specific groups of software developers who are Method Engineers or Process Engineers. Generally, method engineers are responsible to construct, tailor, and maintain software processes for use in a wide-range of software projects in a software development organization. In the realm of service-oriented systems, method engineers need a set of domain specific method fragments, as reusable building blocks of methodologies, in order to assemble method fragments together and construct a new project-specific service-oriented methodology. Notwithstanding the multitude of service-oriented development methodologies, the lack of knowledge about service-oriented software development in a well-structured and standard format has long been felt. The proposed method fragments, as methodological knowledge, provide support for method engineers to create knowledge on developing service-oriented systems and share it with other method engineers. Fortunately, OPEN is a good candidate because it provides a standard meta-model for representation of methodological knowledge via autonomous and coherent method fragments.

In addition, from method engineer’s point of view, authors suppose that contributed method fragments represent pivotal activities, rather than traditional software engineering activities and practices. The proposed fragments must be incorporated into the software development process when an inherently complex and dynamic distributed system is being developed and maintained in a service-oriented style. It is generally agreed today that method fragments can capture and represent the knowledge on software processes in a well-structured and reusable format.

The project leaded to this publication started by the postgraduate thesis of Mahdi Fahmideh Gholami in 2008 with the title of “Introducing a Set of Process Patterns for Service-Oriented Software Development”.

Preliminary contributions of authors on the proposed subject matter of this paper presented in conferences are as follows:

  • M. Fahmideh Gholami, M. Sharifi, P. Jamshidi, F. Shams, H. Haghighi, Process Patterns for Service-Oriented Software Development, Fifth IEEE International Conference on Research Challenges in Information Science (RCIS’11), Guadeloupe, France, May 19-21 2011. [PDF]
  • M. Fahmideh Gholami, F. Shams, P. Jamshidi, M. Sharifi, Toward a Methodological Knowledge for Service-Oriented Development Based on OPEN Meta-Model, Software Engineering and Computer Systems, Communications in Computer and Information Science, 2011, Vol 181, Part 5, 631-643. [WWW]
  • M. Fahmideh Gholami, J. Habibi, F. Shams, S. Khoshnevis, Criteria-Based Evaluation Framework for Service-Oriented Methodologies. UKSim 2010: 122-130
  • M. Fahmideh Gholami, P. Jamshidi, F. Shams, A Procedure for Extracting Software Development Process Patterns, Europian Modelling Symposium (EMS’10), 2010[PDF]

We had several communications during this project by Prof. Brian Henderson-Sellers and Donald Firesmith. They helped us a lot with their comments regarding the evaluation of the contribution.

The overall contribution went through 2 major and 1 minor revisions and finally has been accepted in SoSyM. The editor and reviewers provide us comprehensive and constructive comments that made the final manuscript much more elaborated than the first submission.

We hope that our method fragments finally lead to the OPEN repository maintaining by the not-for-profit OPEN Consortium, an international group of over 35 methodologists, academics, CASE tool vendors and developers.