A Rationale-based Model for Architecture Design Reasoning

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7.1. The EFT system Figure 7.6: General Payment Message Processing Sequence Diagram issues have arisen because of these requirements. The first issue is to deal with missing messages between a member bank and the EFT system. The two requirements R2 5 6 and R2 5 8 specify that payment messages should be retransmitted when no acknowledgement has been received. In this case, we have to devise a mechanism to detect missing acknowledgements in real-time. In AR19, a decision was made to use an alarm clock for sending a timer event to the server to check for such scenario. This is the most efficient way to handle processing because the alternative would be to poll a remote system regularly. A delay of the acknowledgement might be due to a slow response of the remote system. However, it might also be a loss of the original transmission. We err on the side of duplicate transmission rather than missing payment by resending the original message. As a result, duplicate payment message would be ignored if it has been received more than once (AR21 ) and this mechanism uses a database table (i.e. I2 0 1 MsgFlowLog table) to record the processing statuses of payment messages. The second issue is the failure of the machine or the software service during processing. In this case, all servers must be able to recover from their previous states. Decision AR20 115
7.1. The EFT system Figure 7.7: Decisions to Support Transaction Recovery is used to justify a method which is most appropriate for such processing. In this decision, all services must have their status logged in Oracle in a Process Table I2 0 2. If any one of them terminates exceptionally for any reason, it could recover when brought back to service again. This is to ensure that any abnormality would trigger a system self-check to ensure that there are no left-behind payment transactions. As a result of the decision, the Control Server has to be created to coordinate such check and recovery activities. When the servers recover, they would investigate the incomplete units of work at the time of their failure and recover from that point. This decision is related to the next issue of how payment messages are kept in a consistent and durable state. The third issue is to ensure the database ACID properties of a payment message. A server such as MCP could be in the middle of a transaction when it is interrupted. In order to ensure the atomicity of the transaction, a mechanism is required to support persistent inter-process communication (IPC). It means that no transaction could be lost during process-to-process communication. The decision was to use a two-phase commit where the transaction is logged in the MessageFlowLog Oracle table (I2 0 1 ) capturing the state of processing as well as putting the payment into a message queue for the next process in line. This will ensure that the payment transaction can never be in an inconsistent state. An example is the communication between MCP and HVPS. 116
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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
Page 83 and 84: 5.3. Survey findings Business Goals
Page 85 and 86: 5.3. Survey findings 5.3.5 Document
Page 87 and 88: 5.3. Survey findings Table 5.8 summ
Page 89 and 90: 5.3. Survey findings We used Spearm
Page 91 and 92: 5.3. Survey findings previous desig
Page 93 and 94: 5.4. Discussion of findings Since t
Page 95 and 96: 5.4. Discussion of findings or cons
Page 97 and 98: 5.5. Limitations and use design rat
Page 99 and 100: Part III The Representation and App
Page 101 and 102: 6.1. A conceptual model for design
Page 103 and 104: 6.2. Architecture Rationale and Ele
Page 105 and 106: 6.2. Architecture Rationale and Ele
Page 107 and 108: 6.3. Architecture elements Figure 6
Page 109 and 110: 6.4. Architecture rationale Figure
Page 111 and 112: 6.4. Architecture rationale • ris
Page 113 and 114: 6.4. Architecture rationale depicts
Page 115 and 116: 6.5. The extended AREL To prevent c
Page 117 and 118: 6.6. A UML representation of AREL a
Page 119 and 120: 6.6. A UML representation of AREL a
Page 121 and 122: 6.7. AREL usability AE by ≪AEsupe
Page 123 and 124: 6.8. Summary The AREL model is exte
Page 125 and 126: 7.1. The EFT system reasoning, a co
Page 127 and 128: 7.1. The EFT system The processing
Page 129 and 130: 7.1. The EFT system not chosen beca
Page 131 and 132: 7.1. The EFT system Figure 7.5: Int
Page 133: 7.1. The EFT system sequence checki
Page 137 and 138: 7.1. The EFT system Therefore, in a
Page 139 and 140: 7.1. The EFT system Figure 7.10: De
Page 141 and 142: 7.2. An empirical study to validate
Page 151 and 152: 7.3. Summary The case study is spec
Page 153 and 154: 8.1. Background Based on these assu
Page 155 and 156: 8.2. The architecture rationalisati
Page 163 and 164: 8.3. Other applications of ARM As d
Page 165 and 166: 8.3. Other applications of ARM Figu
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Page 169 and 170: Chapter 9 Architecture rationale an
Page 171 and 172: 9.1. Background 9.1 Background In t
Page 173 and 174: 9.2. Traceability of architecture r
Page 175 and 176: 9.4. AREL and eAREL traceability ap
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Chapter 10 Architecture decision de
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10.1. Background 10.1.2 Introductio
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10.2. Building a BBN to represent a
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10.3. Reasoning about change impact
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10.5. Summary design object may cau
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11.1. Capturing architecture design
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11.1. Capturing architecture design
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11.2. Checking AREL models Figure 1
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11.3. Tracing AREL models Figure 11
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11.4. Analysing AREL with BBN • S
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11.5. Limitations Figure 11.13: A P
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Chapter 12 Conclusions 12.1 Summary
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12.2. Contributions reasoning metho
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12.2. Contributions implementations
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12.3. Future work architecture deci
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12.3. Future work to examine the co
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BIBLIOGRAPHY [10] B. W. Boehm, Soft
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BIBLIOGRAPHY [37] A. Eden and R. Ka
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BIBLIOGRAPHY [62] J. D. Herbsleb an
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BIBLIOGRAPHY [89] N. Lassing, D. Ri
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BIBLIOGRAPHY [115] D. L. Parnas,
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BIBLIOGRAPHY [142] Z. Simsek and J.
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BIBLIOGRAPHY [167] W. F. Tichy, N.
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Appendix A AREL Tool User Manual 1
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4.1 AREL Check Model When the Check
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4.2 AREL Model Tracing AREL model t
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Figure 9 - result of downward trace
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To initiate the graph’s creation,
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onto the diagram 14 Assign values t
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Useful Definitions The following ar
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) Some projects only c) Not at all
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19. I revisit architecture design d
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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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A Rationale-based Model for Architecture Design Reasoning

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