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Reconstructing an Architecture
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Why Lost documentation No documentation ever Architectural drift
Prove conformance
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Approaches Manual Methods Top down Bottom up Opportunistic Tools
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Tool-Based Reconstruction
System Tool-Based Reconstruction Reconstruction Pattern Recogn. View Extraction Visualization DB Doc Presentation View Fusion
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Data Source Types Static Dynamic
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Tools Parsers Abstract Syntax Tree Analyzers Lexical Analyzer
Profilers Code instrumentation tools Ad hoc Workbench
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Extracted Data <includes file file>
<contains file function> <defines_var file variable> <contains directory directory> <contains directory file> <calls function function> <access_read function variable> <access_write function variable>
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Guidelines Use least-effort Validate the information extracted
Extract dynamic information when needed
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Tool-Based Reconstruction
System Tool-Based Reconstruction Reconstruction Pattern Recogn. View Extraction Visualization DB Doc Presentation View Fusion
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Database Structure Need a standard format or model Efficient queries
Authors use Rigi Standard Format Efficient queries Support fusion Checkpointing for intermediate results
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DB tables Table of relation names Table of elements
Table for each relation - triples RelationTable RelationType Thing1 Thing2 And/Or IncludesTable File1 File2 ContainsTable File Function …
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Tool-Based Reconstruction
System Tool-Based Reconstruction Reconstruction Pattern Recogn. View Extraction Visualization DB Doc Presentation View Fusion
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View Fusion Reconcile Augment Establish connections
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Example: fusing static and dynamic views of the “calls” relation
Static: calls extracted from source List::length PrimitiveOp::Compute Dynamic: calls detected by profiler List::getnth ArithmeticOp::Compute StringOp::Compute What about these? Static analyzer missed this (no reason given)
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Fusing static+dynamic, continued
PrimitiveOp +Compute Static analyzer saw this Profiler saw these ArithmeticOp +Compute StringOp +Compute Fused list of calls: See examples 10-4, 10-5 p 240 List::length List::getnth PrimitiveOp::Compute
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Example: fusing calls from different processes
main() { register(); } Server main() { launch(); } GUI Launcher Unfused Fused Calls Calls main register launch Server.main register Launcher.main launch
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Guidelines for Fusions
When no single view shows needed information When a view is too ambiguous and ambiguity can be resolved by fusion Use multiple extraction techniques Different kinds of tools Different implementations of tools
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Tool-Based Reconstruction
System Tool-Based Reconstruction Reconstruction Pattern Recogn. View Extraction Visualization DB Doc Presentation View Fusion
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Reconstructions SQL examples for Reconstructions
See 10.9 – aggregate local variables Build SQL queries for reconstruction
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Guidelines Work with the architect if possible
Code segments should be effective at producing new and useful view Naming conventions Directory structure
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Example in text Repeated view fusions and aggregations eventually produce a just-barely-usable view pp 248 – 257
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