Class: StateMachine::MachineCollection

Inherits:
Hash
  • Object
show all
Includes:
Assertions
Defined in:
lib/state_machine/machine_collection.rb

Overview

Represents a collection of state machines for a class

Instance Method Summary collapse

Methods included from Assertions

#assert_exclusive_keys, #assert_valid_keys

Instance Method Details

#fire_events(object, *events) ⇒ Object

Runs one or more events in parallel on the given object. See StateMachine::InstanceMethods#fire_events for more information.



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# File 'lib/state_machine/machine_collection.rb', line 45

def fire_events(object, *events)
  run_action = [true, false].include?(events.last) ? events.pop : true
  
  # Generate the transitions to run for each event
  transitions = events.collect do |event_name|
    # Find the actual event being run
    event = nil
    detect {|name, machine| event = machine.events[event_name, :qualified_name]}
    
    raise(InvalidEvent.new(object, event_name)) unless event
    
    # Get the transition that will be performed for the event
    unless transition = event.transition_for(object)
      machine = event.machine
      event.on_failure(object)
    end
    
    transition
  end.compact
  
  # Run the events in parallel only if valid transitions were found for
  # all of them
  if events.length == transitions.length
    TransitionCollection.new(transitions, :actions => run_action).perform
  else
    false
  end
end

#initialize_states(object, options = {}) ⇒ Object

Initializes the state of each machine in the given object. This can allow states to be initialized in two groups: static and dynamic. For example:

machines.initialize_states(object) do
  # After static state initialization, before dynamic state initialization
end

If no block is provided, then all states will still be initialized.

Valid configuration options:

  • :static - Whether to initialize static states. If set to :force, the state will be initialized regardless of its current value. Default is :force.

  • :dynamic - Whether to initialize dynamic states. If set to :force, the state will be initialized regardless of its current value. Default is true.

  • :to - A hash to write the initialized state to instead of writing to the object. Default is to write directly to the object.



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# File 'lib/state_machine/machine_collection.rb', line 26

def initialize_states(object, options = {})
  assert_valid_keys(options, :static, :dynamic, :to)
  options = {:static => :force, :dynamic => true}.merge(options)
  
  each_value do |machine| 
    machine.initialize_state(object, :force => options[:static] == :force, :to => options[:to]) unless machine.dynamic_initial_state?
  end if options[:static]
  
  result = yield if block_given?
  
  each_value do |machine|
    machine.initialize_state(object, :force => options[:dynamic] == :force, :to => options[:to]) if machine.dynamic_initial_state?
  end if options[:dynamic]
  
  result
end

#transitions(object, action, options = {}) ⇒ Object

Builds the collection of transitions for all event attributes defined on the given object. This will only include events whose machine actions match the one specified.

These should only be fired as a result of the action being run.



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# File 'lib/state_machine/machine_collection.rb', line 79

def transitions(object, action, options = {})
  transitions = map do |name, machine|
    machine.events.attribute_transition_for(object, true) if machine.action == action
  end
  
  AttributeTransitionCollection.new(transitions.compact, options)
end