Class: Prawn::SynchronizedCache

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn/utilities.rb

Overview

Throughout the Prawn codebase, repeated calculations which can benefit from caching are made. n 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.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SynchronizedCache

As an optimization, this could access the hash directly on VMs with a global interpreter lock (like MRI).



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# File 'lib/prawn/utilities.rb', line 12

def initialize
  @cache = {}
  @mutex = Mutex.new
end

Instance Method Details

#[](key) ⇒ any

Get cache entry.

Parameters:

  • key (any)

Returns:

  • (any) 


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# File 'lib/prawn/utilities.rb', line 21

def [](key)
  @mutex.synchronize { @cache[key] }
end

#[]=(key, value) ⇒ void

This method returns an undefined value.

Set cache entry.

Parameters:

  • key (any)
  • value (any) 


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# File 'lib/prawn/utilities.rb', line 30

def []=(key, value)
  @mutex.synchronize { @cache[key] = value }
end