1. Author(s) Politehnica University of Bucharest Automatic Control and Computers Faculty Computer Science Department SSH-Based Efficient File Synchronization Horațiu Popescu horatiu.popescu@cti.pub.ro Bachelor Presentation Session - July 2011

2. Content Overview Background Implementation Testing Conclusions Questions 02.11.2015Bachelor Presentation Session - July 2011 2

3. Overview Java prototype SSH accounts Multi-platform Delta encoding Inotify 02.11.2015Bachelor Presentation Session - July 2011 3

4. Overview 02.11.2015Bachelor Presentation Session - July 2011 4 Usage $ java Client c1_directory client1$ java Client c2_directory client2 SSH-Server

5. Intercepts file system events – FILE_CREATED – FILE_DELETED – FILE_MODIFIED – FILE_RENAMED All platforms supported Background 02.11.2015Bachelor Presentation Session - July 2011 5 Inotify

6. Implementation 02.11.2015Bachelor Presentation Session - July 2011 6 Architecture

7. The main module Reads changes Performs actions Marks the files Implementation 02.11.2015Bachelor Presentation Session - July 2011 7 Synchronizer

8. Listens to a snapshot How it works: 1.Stores initial directory content 2.Makes directories identically 3.Propagates updated changes Implementation 02.11.2015Bachelor Presentation Session - July 2011 8 Synchronizer

9. Test driven development approach JUnit test cases 12 analyzed categories Testing 02.11.2015Bachelor Presentation Session - July 2011 9

10. Testing Filenames on diff. OS Alteration storage Authentication SSH Conflict management User rights Delta encoding Timezone Exception management Change detection 02.11.2015Bachelor Presentation Session - July 2011 10 Categories

11. Testing Runs correctly with two clients Minimal functionality Not all modules are connected 02.11.2015Bachelor Presentation Session - July 2011 11 Application status

12. Implement GUI Extend architecture for a SERVER Allow selective synchronization Write more test cases Clean up the code Conclusions 02.11.2015Bachelor Presentation Session - July 2011 12 Further development

13. Conclusions 02.11.2015Bachelor Presentation Session - July 2011 13 OOP design Modularity Starting point for a release application Learning experience Team work

14. Inotify Multi-platform Real-time scenario Questions 02.11.2015Bachelor Presentation Session - July 2011 14 and Answers