blob 4f1e9e8f95174ff51e3ba8761080888058f8a71a 756 bytes (raw)
name: lib/dtas/mcache.rb # note: path name is non-authoritative(*)
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| | # Copyright (C) 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)
ret[:btime] = DTAS.now
end
ret
end
end
end
|
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