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Android around the clock

Android around the clock. Authors: Lior Narkis Maxim Chepurnyak Supervisor: Ittay Eyal. Agenda. Motivation Project Goals CTP algorithm Application top-level Main modules overview Clock synchronization Membership Playback command dispatch Media Player control GUI

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Android around the clock

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  1. Android around the clock Authors: LiorNarkis Maxim Chepurnyak Supervisor: IttayEyal

  2. Agenda • Motivation • Project Goals • CTP algorithm • Application top-level • Main modules overview • Clock synchronization • Membership • Playback command dispatch • Media Player control • GUI • Design environment • Milestones

  3. Motivation • Android based smart-phones are very common nowadays. These phones are used by many also as a media device. • We want to let a group of two or more of these phones, play the same song at the same time. • The playback can be controlled by any of group member.

  4. Project goals • Creating a distributed Android application which will play a song on different devices all together. • The application will manage the group membership by supporting joining and leaving. • The application will keep all the group members clocks synchronized to each other. • The application will ensure global ordering of users’ commands.

  5. Classless Time Protocol • A network clock synchronization protocol • Based on Omer Gurewitz’s work published in IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 14, NO. 4, AUGUST 2006 • Improvement to NTP

  6. Application top-level • The diagram is neither complete nor final

  7. Clock synchronization module • Implements CTP. • Provides a synchronized clock for other modules. • Provides a level of confidence parameter indicating the CTP quality.

  8. Clock synchronization module – class diagram

  9. Clock synchronization module – sequence diagram for NTP packet life-cycle

  10. Membership module • Maintaining a list of active members(“alive” messages). • Support joining and leaving(avoiding partitions and livelocks). • Provides the members list to the rest of the modules.

  11. Playback command dispatch(PCD) module • Broadcasts commands list sent by the MPC to all group members(including itself). • Delivers commands list to the MPC if no later commands list was delivered before.

  12. Media player control(MPC) module • Drives the Android media player. • Receives commands from the GUI and sends those to the PCD. • Receives commands lists delivered by the PCD. • Processing the commands list.

  13. GUI module • Simple. • Provides joining and leaving a group. • Provides basic playback operations.

  14. Design Environment • The following tools/packages will be used: • Eclipse • JRE 7+ • JDK 1.7+ • Android SDK tools for eclipse • Paradigm UML plugin for eclipse – community edition • The project will be written in Java, using Android libraries, and will be checked on the Android emulator and real Android smart-phones.

  15. Milestones • Completion of mid semester report. • Basic clock synchronization module • Basic membership module • Basic PCD module • Basic MPC module • Basic GUI module • Basic app

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