35 lines
986 B
Ruby
35 lines
986 B
Ruby
# encoding: utf-8
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# typed: strict
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# frozen_string_literal: true
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# utilities.rb : General-purpose utility classes which don't fit anywhere else
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#
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# Copyright August 2012, Alex Dowad. All Rights Reserved.
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#
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# This is free software. Please see the LICENSE and COPYING files for details.
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#
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# This was originally written for the prawn gem.
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require 'thread'
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class PDF::Reader
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# Throughout the pdf-reader codebase, repeated calculations which can benefit
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# from caching are made In some cases, caching and reusing results can not
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# only save CPU cycles but also greatly reduce memory requirements But at the
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# same time, we don't want to throw away thread safety We have two
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# interchangeable thread-safe cache implementations:
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class SynchronizedCache
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def initialize
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@cache = {}
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@mutex = Mutex.new
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end
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def [](key)
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@mutex.synchronize { @cache[key] }
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end
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def []=(key,value)
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@mutex.synchronize { @cache[key] = value }
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end
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end
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end
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