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Overview:
  if cache's modification time is less than 60 seconds old, or less th
+an 120 seconds old when it's busy being updated {
    load cached hash
  else
    load information via API and save hash to speed up subsequent look
+ ups

my $cache_ttl = 60;
my $cachefile = '/tmp/mtapi.'.$router.'.cache';
...
  close LOCK;
  unlink $lockfile;
}