Add bin and edit workflow

bin/gems/pdf-reader-2.14.1/lib/pdf/reader/synchronized_cache.rb

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