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Contents
# This class is used in two cases:
# For facts:
# To prevent calculation of custom metrics as user code may rely on dimension initialization during
# the process of figuring out which keys should be initialized.
#
# For elements:
# To prevent infinite recursion that can be caused if a cube has two custom rollups that call `locate`.
# The result would be that the calculations oscillates between the two metrics on the newly located element.
module Martyr
module Runtime
class FutureMetric
# @param element_or_fact [Element, Fact]
# @param metric [BaseMetric]
# @param method [:rollup, :extract]
def self.wrap(element_or_fact, metric, method)
if metric.is_a?(Martyr::Schema::BuiltInMetric)
metric.send(method, element_or_fact)
else
proc = -> { metric.send(method, element_or_fact) }
new(proc)
end
end
def initialize(proc)
@proc = proc
end
def inspect
@value_retrieved ? @value.inspect : '?'
end
def value
@value_retrieved = true
@value ||= @proc.call
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems