class RDF::Util::Cache::WeakRefCache
This implementation uses the `WeakRef` class from Ruby's standard library, and provides adequate performance on JRuby and on Ruby 2.x.
@see ruby-doc.org/stdlib-2.2.0/libdoc/weakref/rdoc/WeakRef.html
Public Class Methods
new(capacity = -1)
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@param [Integer] capacity
Calls superclass method
RDF::Util::Cache.new
# File lib/rdf/util/cache.rb, line 109 def initialize(capacity = -1) require 'weakref' unless defined?(::WeakRef) super end
Public Instance Methods
[](key)
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@param [Object] key @return [Object]
# File lib/rdf/util/cache.rb, line 117 def [](key) if (ref = @cache[key]) if ref.weakref_alive? value = ref.__getobj__ rescue nil else @cache.delete(key) nil end end end
[]=(key, value)
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@param [Object] key @param [Object] value @return [Object]
# File lib/rdf/util/cache.rb, line 132 def []=(key, value) if has_capacity? @cache[key] = WeakRef.new(value) end value end
delete(key)
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Remove cache entry for key
@param [Object] key @return [Object] the previously referenced object
# File lib/rdf/util/cache.rb, line 144 def delete(key) ref = @cache.delete(key) ref.__getobj__ rescue nil end