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module Ref
# This class serves as a generic reference mechanism to other objects. The
# actual reference can be either a WeakReference, SoftReference, or StrongReference.
class Reference
# The object id of the object being referenced.
attr_reader :referenced_object_id
# Create a new reference to an object.
def initialize(obj)
raise NotImplementedError.new("cannot instantiate a generic reference")
end
# Get the referenced object. This could be nil if the reference
# is a WeakReference or a SoftReference and the object has been reclaimed by the garbage collector.
def object
raise NotImplementedError
end
def inspect
obj = object
"<##{self.class.name}: #{obj ? obj.inspect : "##{referenced_object_id} (not accessible)"}>"
end
end
end
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