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:
# File lib/pdf/reader/synchronized_cache.rb, line 20 def initialize @cache = {} @mutex = Mutex.new end
# File lib/pdf/reader/synchronized_cache.rb, line 24 def [](key) @mutex.synchronize { @cache[key] } end
# File lib/pdf/reader/synchronized_cache.rb, line 27 def []=(key,value) @mutex.synchronize { @cache[key] = value } end