SOFTWARE LIBRARIES AND NUMBERS

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ROBERT REIZhttp://www.versioneye.com/https://twitter.com/robertreiz

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WHAT IS A SOFTWARE LIBRARY?

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RE-USABLE PEACE OF SOFTWARE WITH AN

APPLICATION PROGRAMMING INTERFACE

(API)

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SOFTWARE LIBRARIESBUNDLED AS ...

• JAR file (Java)

•GEM file (Ruby)

•DLL file (.NET)

• tar.gz file (Python PIP)

bundle, share and re-useWednesday, December 5, 12

HOW TO GET IT?

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OLD SCHOOL!

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USE PACKAGE-MANAGERS!

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PACKAGE-MANAGERSLIKE ...

•Maven (http://search.maven.org) - Java

•RubyGems (http://rubygems.org) - Ruby

• PIP (http://pypi.python.org) - Python

•Composer (http://packagist.org) - PHP

•NPM (https://npmjs.org/) - Node.JS

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WHY TO USEPACKAGE-MANAGERS?

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BECAUSE OF DEPENDENCIES!

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A SOFTWARE LIBRARY CAN USE OTHER

SOFTWARE LIBRARIES!

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A DEPENDS ON BB DEPENDS ON CB DEPENDS ON DD DEPENDS ON X

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A DEPENDS ON BB DEPENDS ON CB DEPENDS ON DD DEPENDS ON X

IF YOU WANT TO USE A YOU NEED A, B, C, D AND X

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PACKAGE-MANAGERS ARE RESOLVING RECURSIVE

DEPENDENCIES

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WWW.VERSIONEYE.COMMETA SEARCH ENGINE

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META INFORMATIONS FROM ALL PACKAGE-MANAGERS IN ONE

SINGLE DATABASE.

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VERSION EYE MAKES DEPENDENCIES AND

COMPLEXITY VISIBLE

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http://www.versioneye.com/package/rails

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WHICH SOFTWARE LIBRARY IS MORE COMPLEX?

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SOME NUMBERS

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HOW DO YOU KNOW THAT A PROJECT IS STILL ALIVE?

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HOW MANY SOFTWARE ARTIFACTS PER LANGUAGE?

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Java

Ruby

Python

Node.JS

PHP

0 125000 250000 375000 500000

Java 473413Ruby 456282Python 275904Node.JS 128647PHP 38901

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HOW MANY LIBRARY PROJECTS PER LANGUAGE?

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https://www.versioneye.com/statistics/

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WHICH REPOSITORY IS GROWING LIKE CRAZY?

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https://www.versioneye.com/statistics/

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18%

82%

Java Open Source Libraries

Central MVN Repo Other Repos

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YOU WANT MORE NUMBERS?

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HOW OFTEN IS A LIBRARY USED?

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85%

15%

Usage of JUnit

Using JUnit Not Using JUnit

99%

1%

Usage of TestNG

Using TestNG Not Using TestNG

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MORE NUMBERS COMING SOON

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MANY THANKS

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DO YOU HAVE QUESTIONS?

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DO YOU HAVE QUESTIONS?

TALK TO MEMY NAME IS ROBERT REIZ

Wednesday, December 5, 12