Class: Prawn::SynchronizedCache

Inherits:

Object

• Object
• Prawn::SynchronizedCache

Defined in:

lib/prawn/utilities.rb

Overview

Throughout the Prawn 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:

Instance Method Summary

• #[](key) ⇒ Object
• #[]=(key, value) ⇒ Object
• #initialize ⇒ SynchronizedCache constructor

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

Constructor Details

#initialize ⇒ SynchronizedCache

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

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

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

Instance Method Details

#[](key) ⇒ Object

# File 'lib/prawn/utilities.rb', line 25

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

#[]=(key, value) ⇒ Object

# File 'lib/prawn/utilities.rb', line 28

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