1 / 10

Directory Server

Directory Server. System Software Laboratory. Stream Description File (XML). Stream Description File (XML). Stream Description File (XML). Stream Description File (XML). Stream (Simple Service) Description File (XML). Service Description File (XML). Service Description File (XML).

mormsby
Download Presentation

Directory Server

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Directory Server System Software Laboratory

  2. StreamDescriptionFile (XML) StreamDescriptionFile (XML) StreamDescriptionFile (XML) StreamDescriptionFile (XML) Stream(Simple Service)DescriptionFile (XML) ServiceDescriptionFile (XML) ServiceDescriptionFile (XML) ServiceDescriptionFile (XML) Publish ServiceDescriptionFile (XML) SourceStream Publish New streams Query/Get Query/Get UI ServiceAuthoringTool Publish New services

  3. Service XML file <?xml version="1.0"?> <!DOCTYPE service SYSTEM "service.dtd"> <service> <title>NTHU student canteen live CAM test</title> <description> This service contains a live video stream of a video camera set up in the student canteen of National Tsing Hua University </description> <author>John</author> <category term="Dining"/> <category term="Living"/> <app id="cam_1" type="stream"> <name>Camera One</name> <stream type="video" format="mjpeg" uri="http://host_addr/video.mjpg"> <dimension width="512" height="384"/> </stream> <layout z-index="1" left="20" top="140"/> </app> </service>

  4. Current Progress • An centralized XML database (eXist) for storing/indexing service files. • JAVA Query and Publish interface using XQuery to perform publish and query requests

  5. Decentralized XML DB design • To perform the index/query of XML files in decentralized manner. • Each peer in the system stores some portion of the service XML files collection. • Structured P2P overlay • Routing XQuery in the system

  6. Treeguides as tries in a peer [1,2,3,4] service title description author app catagory [1,2,3,4] [1,2] [2,3,4] [1,2,3] [3,4] name stream layout Ma [2,3] [4] [1] teo dimension r [2] [1] y k tin [2,3] [2] [1,3]

  7. Basic Flow • Peer Join • As most structured p2p system • Generate Peer ID -> participate in the system -> shift some data from other peers • Publish • Generate service XML file (Service authoring tool)->hash the document and send to the peer responsible for it->route update message to other nodes

  8. Basic Flow (cont’d) • Query • Route the query message generated from one peer to the peer containing the desired data. (by looking up the tries of treeguides in the peers along the path)

  9. To-Dos • Many detail aspects of the system, like replication, error recovery,…,etc.

More Related