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Ruby Multiplexer - mash multiple objects together

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  1. # this will relay calls to multiple objects
  2. #
  3. # objects will be removed from the multiplexer when
  4. # a call to them results in an exception
  5. #
  6. # I use it to multiplex input streams (see example below class)
  7.  
  8. class Multiplexer
  9.   def initialize(*args)
  10.     @streams = args
  11.   end
  12.  
  13.   def method_missing(m, *args)
  14.     result = nil
  15.  
  16.     while(t = @streams.shift)
  17.       begin
  18.         if(result = t.send(m,*args))
  19.           @streams.push(t)
  20.           return result
  21.         end
  22.       rescue
  23.       end
  24.     end
  25.   end
  26. end
  27.  
  28. require 'open3'
  29.  
  30. Open3.popen3("ruby -e '$stderr.puts(\"foo\"); $stdout.puts(\"bar\"); $stderr.puts(\"baz\");'") do |input,output,error|
  31.   expected = ['foo','bar','baz']
  32.   input.close
  33.   f=Multiplexer.new(error,output)
  34.   while(line=f.gets)
  35.     if((e=expected.shift) != line.chomp) then
  36.       puts "ERROR: failed unit test; expected #{e}, got #{line.chomp}"
  37.     end
  38.     puts line
  39.   end
  40. end

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