Class for fixing stale WANObjectCache keys using a purge event source.
This is useful for expiring keys that missed fire-and-forget purges. This uses the recentchanges table as a reliable stream to make certain keys reach consistency as soon as the underlying replica database catches up. These means that critical keys will not escape getting purged simply due to brief hiccups in the network, which are more prone to happen accross datacenters.
"I was trying to cheat death. I was only trying to surmount for a little while the darkness that all my life I surely knew was going to come rolling in on me some day and obliterate me. I was only to stay alive a little brief while longer, after I was already gone. To stay in the light, to be with the living, a little while past my time."
-- Notes for "Blues of a Lifetime", by [[Cornell Woolrich]]
Definition at line 23 of file WANCacheReapUpdate.php.