Class: God::Conditions::Complex

Inherits:
PollCondition show all
Defined in:
lib/god/conditions/complex.rb

Constant Summary collapse

AND = 
0x1
OR = 
0x2
NOT = 
0x4

Instance Attribute Summary

Attributes inherited from PollCondition

#interval

Attributes inherited from God::Condition

#info, #notify, #phase, #transition

Attributes inherited from Behavior

#watch

Instance Method Summary collapse

Methods inherited from PollCondition

#after, #before

Methods inherited from God::Condition

#friendly_name, generate, valid?

Methods inherited from Behavior

#after_restart, #after_start, #after_stop, #before_restart, #before_start, #before_stop, #friendly_name, generate

Methods included from God::Configurable

#base_name, #complain, complain, #friendly_name, #reset

Constructor Details

#initialize ⇒ Complex

Returns a new instance of Complex.



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# File 'lib/god/conditions/complex.rb', line 9

def initialize()
  super
  
  @oper_stack = []
  @op_stack = []
  
  @this = nil
end

Instance Method Details

#and(kind) {|oper| ... } ⇒ Object

Yields:

  • (oper) 


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# File 'lib/god/conditions/complex.rb', line 38

def and(kind)
  oper = new_oper(kind, 0x1)
  yield oper if block_given?
end

#and_not(kind) {|oper| ... } ⇒ Object

Yields:

  • (oper) 


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# File 'lib/god/conditions/complex.rb', line 43

def and_not(kind)
  oper = new_oper(kind, 0x5)
  yield oper if block_given?
end

#new_oper(kind, op) ⇒ Object 



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# File 'lib/god/conditions/complex.rb', line 26

def new_oper(kind, op)
  oper = Condition.generate(kind, self.watch)
  @oper_stack.push(oper)
  @op_stack.push(op)
  oper
end

#or(kind) {|oper| ... } ⇒ Object

Yields:

  • (oper) 


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# File 'lib/god/conditions/complex.rb', line 48

def or(kind)
  oper = new_oper(kind, 0x2)
  yield oper if block_given?
end

#or_not(kind) {|oper| ... } ⇒ Object

Yields:

  • (oper) 


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# File 'lib/god/conditions/complex.rb', line 53

def or_not(kind)
  oper = new_oper(kind, 0x6)
  yield oper if block_given?
end

#prepare ⇒ Object 



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# File 'lib/god/conditions/complex.rb', line 22

def prepare
  @oper_stack.each { |oper| oper.prepare }
end

#test ⇒ Object 



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# File 'lib/god/conditions/complex.rb', line 58

def test
  if @this.nil?
    # Although this() makes sense semantically and therefore
    # encourages easy-to-read conditions, being able to omit it
    # allows for more DRY code in some cases, so we deal with a
    # nil @this here by initially setting res to true or false,
    # depending on whether the first operator used is AND or OR
    # respectively.
    if 0 < @op_stack[0] & AND
      res = true
    else
      res = false
    end
  else
    res = @this.test
  end
  
  @op_stack.each do |op|
    cond = @oper_stack.shift
    eval "res " + ((0 < op & AND) ? "&&" : "||") + "= " + ((0 < op & NOT) ? "!" : "") + "cond.test"
    @oper_stack.push cond
  end
  
  res
end

#this(kind) {|@this| ... } ⇒ Object

Yields:



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# File 'lib/god/conditions/complex.rb', line 33

def this(kind)
  @this = Condition.generate(kind, self.watch)
  yield @this if block_given?
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/god/conditions/complex.rb', line 18

def valid?
  @oper_stack.inject(true) { |acc, oper| acc & oper.valid? }
end