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Chapter 3. Data Selection Methodology tems, 1057 unique versions and approximately 55000 classes (in total over all the various systems and releases). Our data comprises three broad types of software systems: (a) Applications, (b) Frameworks, and (c) Libraries. In our selection, we aimed to select a similar number of systems for each of the types. Applications are software systems that can be considered stand-alone and tend to perform a specific set of tasks. Examples from our data set include a Bit-torrent client, a role playing game, an image editor, and a text editor. These systems often tend to have a graphical user interface component. Frameworks and Libraries, on the other hand are systems that provide generic/reusable abstractions with a well defined API. There is one key distinction between a framework and library. Frameworks tend to impose a much stricter flow of control in the program. However, when we classified the systems, we used the terminology that has been used by the development team. So, if a development team classifies their system as a framework, we use the same term. Examples of frameworks in our data set are the Spring framework (an inversion of control framework) and Hibernate Object Relational mapping framework. Some of the libraries that we investigated are popular XML processors like Apache Xerces and Saxon. A full list of all of the systems is provided in Table 3.3, and the meta data that we capture for each system is presented in Appendix A. Our data set contains 14 Applications, 12 Frameworks and 14 Libraries. A set of projects in our data (for instance Hibernate, Spring Framework, Acegi and Saxon) though open source, are developed by engineers that get paid for their effort as these projects are managed by commercial (for-profit) enterprises. All of these systems originally started as traditional open-source projects and over time adopted business models that generate revenue while the source code is still made available under a range of open source licenses. We tagged a system as commercially backed based on information provided on the project web site which indicated the name of the sponsoring company and the developers that work for that entity. 51
Chapter 3. Data Selection Methodology Name Type Rel. Age Size Description Ant Application 16 414 502 Build Management System Azureus Application 41 308 3292 Bittorrent Client Checkstyle Application 18 321 270 Static Code Quality Checker Columba Application 25 259 1100 e-mail client Findbugs Application 19 259 1016 Defect identification Groovy Application 34 289 891 Scripting language JChempaint Application 19 245 839 Chemistry Visualisation JMeter Application 20 389 671 Testing tool kit JabRef Application 22 218 825 Bibliography management Jasperreports Application 53 366 1175 Reporting engine Kolmafia Application 53 227 522 Role Playing Game PMD Application 41 328 570 Static code checker Proguard Application 24 328 481 Java Obfuscator SoapUI Application 21 219 1366 Web Service Testing Tool rssOwl Application 18 168 200 RSS Reader Acegi Framework 20 206 371 Role based Security Castor Framework 29 357 1120 Data binding/persistence Cocoon Framework 15 420 692 Web App. Development Hibernate Framework 49 327 1147 Object Relational Bridge Jena Framework 21 349 1050 Semantic Web Spring Framework 54 279 1664 Lightweight J2EE container Struts Framework 17 432 750 Web App. Development Tapestry Framework 24 308 946 Web App. Development Webwork Framework 22 232 505 Web App. Development Wicket Framework 34 175 746 Web App. Development XWork Framework 22 254 297 Generic Command Pattern iBatis Framework 25 213 203 Object-Relational Persistence ActiveBPEL Library 16 199 2985 BPEL Engine ActiveMQ Library 29 188 1075 Message queue Axis Library 22 244 636 Web Services Compass Library 24 163 1131 Search Engine Freemarker Library 17 390 287 Template engine JFreeChart Library 21 377 587 Charting creation JGroups Library 34 450 496 Multicast Communication Jung Library 23 246 342 Universal Graph Library Lucene Library 17 390 396 Text search engine Saxon Library 22 246 834 XML and XSLT processor Xalan Library 15 207 1198 XSLT Processor Xerces2 Library 20 310 669 XML processor iText Library 54 382 552 PDF Library Table 3.3: Systems investigated - Rel. shows the total number of distinct releases analyzed. Age is shown in Weeks since the first release. Size is a measure of the number of classes in the last version under analysis. 52
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Growth and Change Dynamics in Open
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Dedicated to all my teachers ii
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Declaration I declare that this the
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7. R. Vasa, M. Lumpe, P. Branch, an
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Contents 3.4 Selection Criteria . .
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Contents 7.2.2 Software Metric Tool
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Appendix A Meta Data Collected for
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Appendix C Mapping between Metrics
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Appendix F Change Dynamics Data Fil
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References [1] S. Alam and P. Duger
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References Software. In Proceedings
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References [43] N. Chapin, J. Hale,
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References [315] T. Zimmermann, V.
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