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DynaRIA : a Tool for Ajax Web Application Comprehension

18th IEEE International Conference on Program Comprehension Braga, Portugal 30 June - 2 July, 2010. DynaRIA : a Tool for Ajax Web Application Comprehension. Dipartimento di Informatica e Sistemistica University of Naples “Federico II”, Italy Domenico Amalfitano Anna Rita Fasolino

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DynaRIA : a Tool for Ajax Web Application Comprehension

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  1. 18th IEEE International Conference on Program Comprehension Braga, Portugal 30 June - 2 July, 2010 DynaRIA: a Tool for Ajax Web Application Comprehension DipartimentodiInformatica e Sistemistica University of Naples “Federico II”, Italy DomenicoAmalfitano Anna Rita Fasolino Armando Polcaro PorfirioTramontana

  2. ICPC 2010, Braga, Portugal; 30 june - 2 july, 2010 Background • Ajax is a set of Web Technologies (XHTML, JavaScript , XML, and XMLHttpRequest) usedfor implementing a new generation of Web applications (Rich Internet Applications). • Key aspects of Ajax applications: • The UI is composed by widgets that are updated, deleted or added independently at run time. • The UI is dynamically built on the basis of the events that are fired by the user. • Events are managed by an Ajax Engine (AE). • The Ajax Engine (AE) composed of JavaScript modules • manipulates the UI components, • communicates with the server (exchanges few amounts of data, by asynchronous or synchronous requests) • Most popular examples are: Google Maps, Flickr, Gmail, etc.

  3. ICPC 2010, Braga, Portugal; 30 june - 2 july, 2010 Challenges for AJAX application comprehension • Heterogeneous nature (JS, DOM, XML, ...) • Several parsers are needed • Dynamically configured code (JS code is loaded or built at run-time) • code static analysis is not sufficient • Based on large variety of frameworks • make their behaviour opaque and complicate the analysis of generated code • DynaRIA is a tool designed for the comprehensionof Ajax applications based on dynamic analysis of user sessions. • It produces several types of abstractions and visualizations about the run-time behaviour of the application.

  4. ICPC 2010, Braga, Portugal; 30 june - 2 july, 2010 The approach of DynaRIA –user session analysis • User sessions are traced and recorded through the Web browser offered by DynaRIA. • Each user session trace collets the following data: • User events fired on widgets of the UI. • JavaScript functions activated by user event handlers. • Executed lines of code of JS functions. • Changes (such as add, delete, or change) to UI widgets by DOM analysis. • Message exchanges between client and server. • Exceptions and errors occurred at run time (such as JavaScript errors, Network warnings, etc.). • Collected information about user sessions are shown in several Session Monitor Views provided by the tool.

  5. ICPC 2010, Braga, Portugal; 30 june - 2 july, 2010 The approach of DynaRIA – UML sequence diagram abstraction • DynaRIA abstracts UML sequence diagrams at various levels of detail and abstraction from each user session or from its parts. • UML sequence diagrams are viewed and managed by another tool, dynaRIA Sequence Diagram Viewer. Excerpt of an high level UML sequence diagram Excerpt of a low level UML sequence diagram

  6. ICPC 2010, Braga, Portugal; 30 june - 2 july, 2010 The approach of DynaRIA – testing and debugging activity support • DynaRIA provides functionalities of Capture & Replay. • During usersession replay, the tool: • traces the JS code execution and keeps track of performed network traffic, • detects run-time JS exceptions (such as JS syntax errors, array out of bound errors, etc.) and network warning occurred at run-time. • The tool computes several JS code coverage metrics with respect to a replayed set of user sessions.

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