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Contents
# frozen_string_literal: true
module Datadog
module Utils
# Helper class to execute something only once such as not repeating warning logs, and instrumenting classes
# only once.
#
# Thread-safe when used correctly (e.g. be careful of races when lazily initializing instances of this class).
#
# Note: In its current state, this class is not Ractor-safe.
# In https://github.com/DataDog/dd-trace-rb/pull/1398#issuecomment-797378810 we have a discussion of alternatives,
# including an alternative implementation that is Ractor-safe once spent.
class OnlyOnce
def initialize
@mutex = Mutex.new
@ran_once = false
end
def run
@mutex.synchronize do
return if @ran_once
@ran_once = true
yield
end
end
def ran?
@mutex.synchronize { @ran_once }
end
private
def reset_ran_once_state_for_tests
@mutex.synchronize { @ran_once = false }
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems