Class: Tee

Inherits:
Object
  • Object
show all
Defined in:
lib/libisi/tee.rb

Overview

Copyright © 2007-2010 Logintas AG Switzerland

This file is part of Libisi.

Libisi is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Libisi is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Libisi. If not, see <www.gnu.org/licenses/>.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(children = []) ⇒ Tee

Returns a new instance of Tee.



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# File 'lib/libisi/tee.rb', line 45

def initialize(children = [])
  @children = children
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_id, *arguments, &block) ⇒ Object 



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# File 'lib/libisi/tee.rb', line 53

def method_missing(method_id, *arguments, &block)
  if block
    function_results, block_results = call_child(0, method_id, arguments, block)
    function_results[0]
  else
    $log.debug{"Calling #{signature(method_id, *arguments, &block)} sequentially"}
    # no block given, we can execute 
    # methods sequentially
    result = nil
    children.each_with_index {|child, index|
	if index < (children.length-1)
 child.send(method_id, *(deep_clone(arguments)))
	else
 result = child.send(method_id, *arguments)
	end
    }
    result
  end
end

Instance Attribute Details

#children ⇒ Object

Returns the value of attribute children.



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# File 'lib/libisi/tee.rb', line 19

def children
  @children
end

Instance Method Details

#call_child(child_id, method_id, arguments, block) ⇒ Object 



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# File 'lib/libisi/tee.rb', line 73

def call_child(child_id, method_id, arguments, block)    
  raise "child with id #{child_id} does not exist" unless 
    children[child_id]

  original_arguments = arguments
  arguments = deep_clone(arguments)

  raise "no block given" unless block
  signature = signature(method_id, *arguments, &block)
  $log.debug("Child ##{child_id}: Calling #{signature}")

  vars = []
  if block.arity > 0
    block.arity.times {|i| vars.push("a#{i}")}      
  else
    (-block.arity - 1).times {|i| vars.push("a#{i}")}      
    vars.push("*a")
  end
  block_text = ""
  block_text += "proc {|#{vars.join(",")}|\n"
  if child_id < (children.length-1)
    block_text += "  call_count += 1\n"
    block_text += "  function_results, block_results = call_child(child_id + 1, method_id, original_arguments, block) if call_count == 1\n"
    block_text += "  br = block_results[(call_count-1)]\n"
    block_text += "  br = deep_clone(br)\n"
#      block_text += "  p [#{vars.join(",")}]\n"
    block_text += "  br\n"
  else
    $log.debug("Last child, collecting results")
    # this is the last child
    # here we must collect all
    # block results
    block_text += "  br = block.call(#{vars.join(",")})\n"
    block_text += "  $log.debug{\"Result of block is: \#\{br.inspect}\"\}\n"
    block_text += "  block_results << deep_clone(br)\n"
    block_text += "  call_count += 1\n"
    block_text += "  br\n"
  end
  block_text += "}\n"
  block_results = []
  function_results = []
  call_count = 0
  new_block = eval(block_text)
  raise "Not same arity" if new_block.arity != block.arity

  if child_id < (children.length-1)
    function_results << children[child_id].send(method_id, *(deep_clone(arguments)), &new_block)
  else
    function_results << children[child_id].send(method_id, *original_arguments, &new_block)
  end
  raise "#{signature} master block execute #{block_results.length - 1} " + 
    "times child block ##{child_id} #{call_count} times." if 
    call_count != (block_results.length)
  [function_results, block_results]
end

#deep_clone(obj) ⇒ Object 



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# File 'lib/libisi/tee.rb', line 21

def deep_clone(obj)
  case obj
  when NilClass
    obj
  when Fixnum,Bignum,Float,NilClass,FalseClass,
	TrueClass,Continuation, Symbol, Rational
    klone = obj
  when Hash
    klone = obj.clone
    obj.each{|k,v| klone[k] = deep_clone(v)}
  when Array
    klone = obj.clone
    klone.clear
    obj.each{|v| klone << deep_clone(v)}      
  else
    klone = obj.clone
  end
  klone.instance_variables.each {|v|
    klone.instance_variable_set(v,deep_clone(klone.instance_variable_get(v)))
  }
  klone
end

#signature(method_id, *arguments, &block) ⇒ Object 



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# File 'lib/libisi/tee.rb', line 49

def signature(method_id, *arguments, &block)
  "#{method_id}(#{arguments.map {|a| a.inspect}.join(",")}#{",&block" if block})"
end