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Using BITS for updates

Using BITS for updates. Quick training session. Goal / Purpose. Download and install takes a long time End user just wants to work ! We want smooth updates …. Goal / Purpose. Download and install takes a long time End user just wants to work ! We want smooth updates …. Solution.

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Using BITS for updates

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  1. Using BITS for updates Quick training session

  2. Goal / Purpose • Download and install takes a long time • End user just wants to work! • We want smooth updates …

  3. Goal / Purpose • Download and install takes a long time • End user just wants to work! • We want smooth updates … Solution • Background downloads • Scheduled install

  4. What is BITS? • Background Intelligent Transfer Service • Windows component • Foundation for Windows Update • Available from 2001 (XP and W2000) • Version 1.5 • Version 4.0

  5. How does it work? • Create a “job”, like download this file • Periodically check the status • When finished, save (copy) the file

  6. BITS Advantages • Works everywhere • Asynchronous • Downloads even if CET is turned off • Uses idle network bandwidth

  7. BITS Cons • Very slow response time (10-300 ms) • Very sensitive to workload (jobs*files) • No support for directory listings (!) • No peer caching (in version < 4) • One file at a time feeling • Windows Update might interfere … • Narrow bandwidth – unknown …

  8. Dealing with the cons • Job queue (limit to 5 jobs) • Webdirectory.exe • Defensive polling (only when idle)

  9. What can YOU do with BITS? • Marbodal uses BITS for pricelist updates • BITS can also do uploads (like issue reports) • Easy to sync all files in a directory (*.db) • OO – you can subclass and customize • But – it’s still not mature … • So there will be stuff missing …

  10. Single file example // Setup a handler UpdateHandler handler = createUpdateHandler("cet-test-bits", "CET Test Handler"); handler.updateInterval = 3 minutes; handler.jobInterval = 30 s; handler.idleThreshold = 5 s; // Setup an update group strremoteDir = configuraWebRoot # relativeDir; UrllocalDir = cmWritable("data/"); RtBitsTestGroupgroup("cet-test-bits-group", "Test Group", remoteDir, localDir, waitForAll=true); handler << group; // Setup a single file to keep updated RtBitsTestUpdateupdate(fileToDownload); group << update; // Start the timers handler.startTimers();

  11. Directory example • // Setup a handler • UpdateHandler handler = createUpdateHandler("cet-test-bits", "CET Test Handler"); • handler.updateInterval = 3 minutes; • handler.jobInterval = 30 s; • handler.idleThreshold = 5 s; • // Setup an update group • strremoteDir = configuraWebRoot # relativeDir; • UrllocalDir = cmWritable("data/"); • UpdateDirectoryGroupsyncMyStuff("my-pricelists-sync", "Sync the pricelists directory", • remoteDir, localDir, waitForAll=true); • // Start the timers • handler.startTimers();

  12. Extension updates • Example of an advanced implementation • Header (info) files • Version numbers embedded • File dependencies & consistency • Only update Extensions the user has installed • Or Extensions selected manually by user

  13. Extension updates example • Webdirectory.exe downloads dirlist (async) • New info files downloaded • Info files versions compared to installed • Download new Extensions • Notify user about new updates • And allow scheduled install

  14. Errors • Files inconsistent (being uploaded) • Online file removed during download • Online file replaced during download

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