Class: Muze::Core::BoundedCache

Inherits:
Object
  • Object
show all
Defined in:
lib/muze/core/cache.rb

Overview

Tiny bounded LRU cache for generated DSP lookup tables.

Instance Method Summary collapse

Constructor Details

#initialize(max_size:) ⇒ BoundedCache

Returns a new instance of BoundedCache.

Raises:



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# File 'lib/muze/core/cache.rb', line 7

def initialize(max_size:)
  raise Muze::ParameterError, "max_size must be positive" unless max_size.is_a?(Integer) && max_size.positive?

  @max_size = max_size
  @entries = {}
  @mutex = Mutex.new
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/muze/core/cache.rb', line 29

def clear
  @mutex.synchronize { @entries.clear }
end

#fetch(key) ⇒ Object 



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# File 'lib/muze/core/cache.rb', line 15

def fetch(key)
  @mutex.synchronize do
    if @entries.key?(key)
      value = @entries.delete(key)
      @entries[key] = value
      return value
    end

    value = yield
    @entries.shift while @entries.size >= @max_size
    @entries[key] = value
  end
end

#size ⇒ Object 



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# File 'lib/muze/core/cache.rb', line 33

def size
  @mutex.synchronize { @entries.size }
end