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Contents
require 'ddtrace/utils/sequence'
module Datadog
module Utils
# Tracks strings and returns IDs
class StringTable
def initialize
@sequence = Sequence.new
@ids = { ''.freeze => @sequence.next }
end
# Returns an ID for the string
def fetch(string)
@ids[string.to_s] ||= @sequence.next
end
# Returns the canonical copy of this string
# Typically used for psuedo interning; reduce
# identical copies of a string to one object.
def fetch_string(string)
return nil if string.nil?
# Co-erce to string
string = string.to_s
# Add to string table if no match
@ids[string] = @sequence.next unless @ids.key?(string)
# Get and return matching string in table
# NOTE: Have to resolve the key and retrieve from table again
# because "string" argument is not same object as string key.
id = @ids[string]
@ids.key(id)
end
def [](id)
@ids.key(id)
end
def strings
@ids.keys
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems