Class: Stagecraft::Renderer::PipelineCache

Inherits:
Object
  • Object
show all
Defined in:
lib/stagecraft/renderer/pipeline_cache.rb

Defined Under Namespace

Classes: Key

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(limit: 256, on_change: nil) ⇒ PipelineCache

Returns a new instance of PipelineCache.

Raises:

  • (ArgumentError) 


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# File 'lib/stagecraft/renderer/pipeline_cache.rb', line 13

def initialize(limit: 256, on_change: nil)
  @limit = Integer(limit)
  raise ArgumentError, "pipeline cache limit must be positive" unless @limit.positive?

  @entries = {}
  @on_change = on_change
end

Instance Attribute Details

#limit ⇒ Object (readonly)

Returns the value of attribute limit.



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# File 'lib/stagecraft/renderer/pipeline_cache.rb', line 11

def limit
  @limit
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/stagecraft/renderer/pipeline_cache.rb', line 39

def clear
  @entries.each_value { |value| release(value) }
  @on_change&.call(-@entries.length)
  @entries.clear
  self
end

#fetch(key) ⇒ Object 



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# File 'lib/stagecraft/renderer/pipeline_cache.rb', line 21

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

  value = yield
  @entries[key] = value
  @on_change&.call(1)
  evict! while @entries.length > limit
  value
end

#size ⇒ Object 



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# File 'lib/stagecraft/renderer/pipeline_cache.rb', line 35

def size
  @entries.size
end