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# frozen_string_literal: true
require_relative 'destination_base'
module ProcessExecuter
module Destinations
# Handles a destination for writing to multiple destinations
#
# The destination is an array with the first element being :tee and the rest
# being the destinations.
#
# @api private
class Tee < DestinationBase
# Initializes a destination handler for writing to multiple output destinations
#
# @param destination [Array<Symbol, Object...>] array in the form [:tee, destination...]
#
# @raise [ArgumentError] if a child destination is invalid or incompatible
#
def initialize(destination)
super
@child_destinations = destination[1..].map { |dest| ProcessExecuter::Destinations.factory(dest) }
end
# An array of child destinations
#
# @return [Array<ProcessExecuter::Destinations::DestinationBase>]
# An array of the child destination handlers
#
attr_reader :child_destinations
# Writes data each of the {child_destinations}
#
# @example
# tee = ProcessExecuter::Destinations::Tee.new([:tee, "output1.log", "output2.log"])
# tee.write("Log entry with specific permissions")
# tee.close # Important to close the tee to ensure all data is flushed
#
# @param data [String] the data to write
#
# @return [Integer] the number of bytes in the input data (which is written to each destination)
#
# @raise [IOError] if the file is closed
#
def write(data)
super
child_destinations.each { |dest| dest.write(data) }
data.bytesize
end
# Closes the child_destinations
#
# @return [void]
def close
child_destinations.each(&:close)
end
# Determines if this class can handle the given destination
#
# @param destination [Object] the destination to check
# @return [Boolean] true if destination is an Array in the form [:tee, destination...]
def self.handles?(destination)
destination.is_a?(Array) && destination.size > 1 && destination[0] == :tee
end
end
end
end
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