Architecture Analysis Techniques Ding Li 2927154806

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Architecture Analysis Techniques Ding Li 2927154806 Slide 2 Review Slide 3 Inspections and Reviews Manual Techniques Static or Scenario-based In Theory, it can test everything of an architecture All stakeholders are involved Not only technical people Slide 4 the Architectural Trade-off Analysis Method First proposed by Clements in CMU Human-centric process to identify risks in the early stage of software design All stakeholders will be involved Clients Managers Developers Slide 5 ATAM Focus on non-functional properties Modifiability Security Performance Reliability Identify risks Reveal how well the system meets the requirements Slide 6 Detail of ATAM 4 Phases Preparation Presentation and Analysis Testing and Reporting Finalization 9 steps Slide 7 Phase 0-Preparation Find out the right people Who will do the presentation Who will be the representatives of clients Training Session Necessary Materials Kick-off Meeting Slide 8 Phase 1-Presentation and Analysis Step 1:Present the ATAM Step 2:Present the business drivers Step 3:Present the architecture Step 4:Identify the Architectural Approaches Step 5: Draw the Quality Attribute Utility Tree Step 6:Analyze the Architectural Approach Slide 9 Phase 2-Testing and Reporting Step 7: Brainstorming and Prioritizing Scenarios Step 8: Analyze the Architectural Approach Step 9: Present the result Slide 10 Phase 3- Finalize Producing a final report Collecting Data for measurement and improvement Archive all artifacts Slide 11 Why use the ATAM? Enable non-technical people to control the quality of software A Method for developers to sell their project Slide 12 Limitation of ATAM Expensive Time consuming Human intensive Slide 13 Model Based Analysis Based on the description of Architecture ADLs Can be done automatically Less expensive Slide 14 Model Based Analysis Goals Consistency Compatibility Internal Completeness Scope Component level Data exchange level Type Static Slide 15 Model Based Analysis Techniques are complex May not be possible to analyze a very large system in a very high accuracy Sometimes may need to sacrifice some accuracy Can only analyze properties that are not formally described Non-functional Properties are not supported Slide 16 Model Based Analysis Enabled by ADLs Parsers and compilers Check the syntax Check consistency Exam Refinement Exam Constrains type DataStore be interface action in SetValues(); out NotifyNewValues(); behavior begin SetValues => NotifyNewValues();; end DataStore; type Calculation is interface action in SetBurnRate(); out DoSetValues(); behavior action CalcNewState(); begin SetBurnRate => CalcNewState1(); DoSetValues(a);; end Calculation; type Player is interface action out DoSetBurnRate(); in NotifyNewValues(); behavior TurnsRemaining : var integer := 1; action UpdateStatusDisplay(); action Done(); Slide 17 Simulation-Based Analysis Create a dynamic executable model of system It is a high level executable model Require support from modeling language, not all languages are executable Slide 18 Simulation-Based Analysis Goals Completeness Consistency Compatibility Correctness Scope System or subsystem level Dataflow Slide 19 Simulation-Based Analysis Concern Behaviors Interaction Non-functional properties Dynamic, scenario-based Fully automated Slide 20 XTEAM Is developed by George Edwards Create simulation codes from High-level model Easy to change the model and create new simulation codes Can simulate the latency, power consumption and reliability of a system Slide 21 XTEAM Toolchain Slide 22 Meta-model in XTEAM Slide 23 xADL in XTEAM Slide 24 FSP in XTEAM FSP is a behaviors ADL Present Finite State Machine in an algebra way Slide 25 Power simulation in XTEAM Assign the Power consumption of each process Assigned by Power model Assigned by Domain Expert Record the power consumption of each invocation of process Data are analyzed by human Slide 26 Summary of XTEAM Fully automatic simulation Generate simulation code automatically Human are only involved in Data analysis A wider range of goals and concerns and be achieved than static techniques Could analysis some non-functional properties Slide 27 Reliability Analysis The probability that the system runs without failure A failure is the occurrence of an incorrect output according to an input Error: mental mistake made by programmers Fault: manifestation of an error Slide 28 Reliability Metrics Time to failure Time to repair Time between failures Slide 29 Discrete Markov Model A Stochastic Process Model Based on a Finite State Machine Slide 30 Hidden Markov Process Transition Probabilities between each state may not be known Need some training data to estimate transition probabilities Simulation is needed Slide 31 Summary of Reliability Analysis Reliability analysis can be both dynamic or static Require Domain Knowledge Some times the Markov properties may not satisfied Slide 32 Summary ATAM Model-based Analysis Simulation-based Analysis Reliability Analysis Slide 33 Reference Evaluating Software Architecture: Methods and Case Studies Guide to the Rapide-1.0 Language Reference Manuals Rapide-1.0 Architecture Language Reference Manual OMG Object Constraint Language (OCL) Documents DRESDEN OCL MANUAL FOR INSTALLATION, USE AND DEVELOPMENT Model and Object Verification by Using Dresden OCL Birgit Demuth et.al 2009 XTEAM USER MANUAL Finite State Process Algebra and LTSA Scenario-Driven Dynamic Analysis of Distributed Architectures George Edwards et.al 2007 Estimating Software Component Reliability by Leveraging Architectural Models Roshanak Roshandel et.al 2006