Module: StateMachine::InstanceMethods

Defined in:
lib/ruby-state-machine/state_machine.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#event_history ⇒ Object

Returns the value of attribute event_history.



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# File 'lib/ruby-state-machine/state_machine.rb', line 69

def event_history
  @event_history
end

Instance Method Details

#current_state ⇒ Object 



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# File 'lib/ruby-state-machine/state_machine.rb', line 128

def current_state
  check_current_state
  @current_state
end

#current_state=(state) ⇒ Object 



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# File 'lib/ruby-state-machine/state_machine.rb', line 133

def current_state=state
  @current_state = state.to_sym
end

#default_state ⇒ Object 



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# File 'lib/ruby-state-machine/state_machine.rb', line 137

def default_state
  (self.class.default_state) ? self.class.default_state : self.class.states.first
end

#initialize(args = nil) ⇒ Object 



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# File 'lib/ruby-state-machine/state_machine.rb', line 71

def initialize(args=nil)
  @current_state = default_state
  @event_history = BoundedArray.new
  # Attempt to call super:
  begin
    super(args)
  rescue ArgumentError
    super() 
  end
  #puts "Current state is #{@current_state} #{@current_state.class}"
end

#send_event(event) ⇒ Object 



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# File 'lib/ruby-state-machine/state_machine.rb', line 83

def send_event(event)
  # puts "Sending event: #{event}"
  check_current_state
  next_state_instruction = self.class.next_state_instruction(@current_state, event)
  if next_state_instruction.nil?
    cs = @current_state
    # This was causing problems in unit tests:
    # @current_state = default_state
    # puts "Returned to default state: [#{@current_state}]."
    raise InvalidStateError, "No valid next state for #{cs.inspect} using event #{event.inspect} (#{cs.class}/#{event.class})." 
  end
  
  if(next_state_instruction)
    if(!String(next_state_instruction[:decider]).empty?)
      # Decider present, call method:
      decide_id = execute(next_state_instruction[:decider], event)
      
      # Error checking:
      if String(decide_id).empty?
        raise InvalidStateError, 
          "Decider returned blank/nil for #{@current_state} using event #{event}.  Next state from decider: [#{decide_id.inspect}].  Possible next states are [#{next_state_instruction[:next].inspect}]"  
      end
      
      # Find next state:
      instruction = Array(next_state_instruction[:next]).detect { |i| 
        i[:state].to_sym==decide_id.to_sym or i[:name].to_sym==decide_id.to_sym
      } 

      # Error checking:
      if instruction.nil?
        raise InvalidStateError, 
          "No valid next instruction for #{@current_state} using event #{event}.  Next state from decider: [#{decide_id.inspect}(#{decide_id.class})].  Possible next states are [#{next_state_instruction[:next].inspect}]"  
      end
      
      # Do it:
      process_instruction(instruction, event)
    else            
      # Do it:
      process_instruction(next_state_instruction[:next], event)
    end
    @current_state
  end
  @event_history.push(event)
end