diff options
Diffstat (limited to 'lib/dtas/mcache.rb')
-rw-r--r-- | lib/dtas/mcache.rb | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/dtas/mcache.rb b/lib/dtas/mcache.rb new file mode 100644 index 0000000..b638a23 --- /dev/null +++ b/lib/dtas/mcache.rb @@ -0,0 +1,31 @@ +# Copyright (C) 2016 all contributors <dtas-all@nongnu.org> +# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt> +# frozen_string_literal: true +# encoding: binary +require_relative '../dtas' + +class DTAS::Mcache + def initialize(shift = 8, ttl = 60) + @mask = (1 << shift) - 1 + @ttl = ttl + @tbl = [] + end + + def lookup(infile) + bucket = infile.hash & @mask + if cur = @tbl[bucket] + if cur[:infile] == infile && (DTAS.now - cur[:btime]) < @ttl + return cur + end + end + return unless block_given? + @tbl[bucket] = begin + cur = cur ? cur.clear : {} + if ret = yield(infile, cur) + ret[:infile] = infile.frozen? ? infile : infile.dup.freeze + ret[:btime] = DTAS.now + end + ret + end + end +end |