Merged revisions 295711 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r295711 | russell | 2010-11-19 18:50:00 -0600 (Fri, 19 Nov 2010) | 36 lines
  
  Merged revisions 295710 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r295710 | russell | 2010-11-19 18:45:51 -0600 (Fri, 19 Nov 2010) | 29 lines
    
    Fix cache of device state changes for multiple servers.
    
    This patch addresses a regression where device states across multiple servers
    were not being processing completely correctly.  The code works to determine
    the overall state by looking at the last known state of a device on each
    server.  However, there was a regression due to some invasive rewrites of how
    the cache works that led to the cache only storing the last device state change
    for a device, regardless of which server it was on.
    
    The code is set up to cache device state change events by ensuring that each
    event in the cache has a unique device name + entity ID (server ID).  The code
    that was responsible for comparing raw information elements (which EID is)
    always returned a match due to a memcmp() with a length of 0.
    
    There isn't much code to fix the actual bug.  This patch also introduces a new
    CLI command that was very useful for debugging this problem.  The command
    allows you to dump the contents of the event cache.
    
    (closes issue #18284)
    Reported by: klaus3000
    Patches:
          issue18284.rev1.txt uploaded by russell (license 2)
    Tested by: russell, klaus3000
    
    (closes issue #18280)
    Reported by: klaus3000
    
    Review: https://reviewboard.asterisk.org/r/1012/
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git-svn-id: http://svn.digium.com/svn/asterisk/trunk@295712 f38db490-d61c-443f-a65b-d21fe96a405b

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