A Rationale-based Model for Architecture Design Reasoning

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11.2. Checking AREL models Figure 11.5: A hierarchy of elements in an AR Figure 11.6: An Example of a Qualitative Rationale (QLR) 11.2 Checking AREL models The structure of the AREL model has been defined in a particular way so that architecture rationale can be related to the architecture elements in a causal relationship. Its definition is contained in Section 6.2. We had to implement a custom checking program called the AREL Tool for a number of reasons: (a) we are not able to modify Enterprise Architect to verify the AREL structure, we have developed the AREL Tool to read the Enterprise Architect repository and to check the AREL model directly; (b) OCL is not implemented in Enterprise Architect to support model checking; (c) although AREL model requires an acyclic graph, users can still create a UML model that is recursive, as such the model checking program must be a trigger to traverse the entire model and it must terminate, 195
11.2. Checking AREL models Figure 11.7: An Example of a Quantitative Rationale (QNR) hence a separate program is required. The AREL Tool is developed in Microsoft .Net and runs on the Windows XP platform. The consistency checking of the AREL model follows a number of rules: • Detect any directed cycles in the AREL model. An error is shown when it happens. • Detect any improper model construct which violates the AREL definition. The anomalies are: two AEs are linked directly by ≪ARtrace≫ without an AR; two ARs are linked directly by ≪ARtrace≫ without an AE; the leave node is an AR; the root node is an AR. The tool reports these as errors. • Detect any isolated items such as an AE or an AR which are not connected to any other elements. The tool reports these as warnings. The AREL Tool is contained in a program (i.e. EAModelProjectUI.exe). It is a standalone program and can be downloaded from [155]. The installation of the program is done by running Setup.exe. When the program starts up, the user has to specify the Enterprise Architect repository that contains the AREL model. Then the AREL Tool would open the repository and a number of options are displayed in a window for the user to select. This is shown in Figure 11.8. The user can click the Check Model button to start the consistency checking. When checking is complete, the tool displays a screen to show any errors or warnings which are present in the AREL model in a pop-up window. If any error is reported, then the result would indicate that the AREL model is inconsistent. An example of the window is shown in Figure 11.9. A detailed error report is also produced and it is located in the same directory as the Enterprise Architect repository. If errors are present, users will need to update the AREL model to correct them and re-run the AREL Tool to check that they have been fixed. The user manual of the AREL Tool is contained in Appendix A and so its operations are not described in details here. 196
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A Rationale-based Model for Archite
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maintenance. These techniques can h
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Declaration This thesis contains no
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2.2.6 DoD Architecture Framework .
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5.4.6 Risk assessment in architectu
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8.2 The architecture rationalisatio
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12.2 Contributions . . . . . . . .
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6.10 ≪AR≫ and ≪AAR≫ Stereot
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11.13A Process to Synchronise Chang
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5.13 Design Rationale Helps Evaluat
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that architecture design is highly
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1.2. Research motivations and resea
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1.2. Research motivations and resea
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1.4. Structure of the thesis the ch
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Part I Problem Analysis 10
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2.1. Industry practice of design ra
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2.2. Architecture frameworks and de
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Chapter 3 Related work in design ra
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3.2. Why do we need design rational
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3.2. Why do we need design rational
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3.3. Existing methods for capturing
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3.4. Other related studies 3.3.7 Qu
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3.4. Other related studies evolutio
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3.5. How well design rationale meth
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3.5. How well design rationale meth
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Chapter 4 Research methodology and
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4.1. Software engineering research
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4.2. The chosen research and valida
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Part II Architecture Design Rationa
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on a regular basis. Their inputs ha
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5.1. Architecture rationale in the
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5.2. Survey methodology data collec
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5.3. Survey findings experience). I
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5.3. Survey findings Table 5.1: Fre
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5.3. Survey findings Business Goals
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5.3. Survey findings 5.3.5 Document
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5.3. Survey findings Table 5.8 summ
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5.3. Survey findings We used Spearm
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5.3. Survey findings previous desig
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5.4. Discussion of findings Since t
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5.4. Discussion of findings or cons
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5.5. Limitations and use design rat
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Part III The Representation and App
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6.1. A conceptual model for design
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6.2. Architecture Rationale and Ele
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6.2. Architecture Rationale and Ele
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6.3. Architecture elements Figure 6
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6.4. Architecture rationale Figure
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6.4. Architecture rationale • ris
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6.4. Architecture rationale depicts
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6.5. The extended AREL To prevent c
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6.6. A UML representation of AREL a
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6.6. A UML representation of AREL a
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6.7. AREL usability AE by ≪AEsupe
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6.8. Summary The AREL model is exte
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7.1. The EFT system reasoning, a co
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7.1. The EFT system The processing
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7.1. The EFT system not chosen beca
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7.1. The EFT system Figure 7.5: Int
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7.1. The EFT system sequence checki
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7.1. The EFT system Figure 7.7: Dec
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7.1. The EFT system Therefore, in a
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7.1. The EFT system Figure 7.10: De
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7.2. An empirical study to validate
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7.3. Summary The case study is spec
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8.1. Background Based on these assu
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8.2. The architecture rationalisati
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Page 233 and 234: BIBLIOGRAPHY [10] B. W. Boehm, Soft
Page 235 and 236: BIBLIOGRAPHY [37] A. Eden and R. Ka
Page 237 and 238: BIBLIOGRAPHY [62] J. D. Herbsleb an
Page 239 and 240: BIBLIOGRAPHY [89] N. Lassing, D. Ri
Page 241 and 242: BIBLIOGRAPHY [115] D. L. Parnas,
Page 243 and 244: BIBLIOGRAPHY [142] Z. Simsek and J.
Page 245 and 246: BIBLIOGRAPHY [167] W. F. Tichy, N.
Page 247 and 248: Appendix A AREL Tool User Manual 1
Page 249 and 250: 4.1 AREL Check Model When the Check
Page 251 and 252: 4.2 AREL Model Tracing AREL model t
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Complaint Procedure If you have any
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Privacy Protection Only investigato
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B. Exploring design reasoning. 1. W
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3. Why does the system use asynchro
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C. General Comments on AREL Modelli
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IEEE Computer Society Press. A. Tan
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