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+#
+# dbiff.rb - distributed cdbiff (server)
+# * original: cdbiff by Satoru Takabayashi <http://namazu.org/~satoru/cdbiff>
+
+require 'drb/drb'
+require 'drb/eq'
+require 'drb/observer'
+
+class Biff
+ include DRb::DRbObservable
+
+ def initialize(filename, interval)
+ super()
+ @filename = filename
+ @interval = interval
+ end
+
+ def run
+ last = Time.now
+ while true
+ begin
+ sleep(@interval)
+ current = File::mtime(@filename)
+ if current > last
+ changed
+ begin
+ notify_observers(@filename, current)
+ rescue Error
+ end
+ last = current
+ end
+ rescue
+ next
+ end
+ end
+ end
+end
+
+def main
+ filename = "/var/mail/#{ENV['USER']}"
+ interval = 15
+ uri = 'druby://:19903'
+
+ biff = Biff.new(filename, interval)
+
+ DRb.start_service(uri, biff)
+ biff.run
+end
+
+main
+