Class: Sequent::Core::Helpers::MessageRouter

Inherits:
Object
  • Object
show all
Defined in:
lib/sequent/core/helpers/message_router.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MessageRouter

Returns a new instance of MessageRouter.



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# File 'lib/sequent/core/helpers/message_router.rb', line 12

def initialize
  clear_routes
end

Instance Attribute Details

#instanceof_routes ⇒ Object (readonly)

Returns the value of attribute instanceof_routes.



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# File 'lib/sequent/core/helpers/message_router.rb', line 10

def instanceof_routes
  @instanceof_routes
end

#routes ⇒ Object (readonly)

Returns the value of attribute routes.



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# File 'lib/sequent/core/helpers/message_router.rb', line 10

def routes
  @routes
end

Instance Method Details

#clear_routes ⇒ Object

Removes all routes from the router.



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# File 'lib/sequent/core/helpers/message_router.rb', line 54

def clear_routes
  @instanceof_routes = Hash.new { |h, k| h[k] = Set.new }
  @routes = Hash.new { |h, k| h[k] = Set.new }
end

#match_message(message) ⇒ Object

Returns a set of handlers that match the given message, or an empty set when none match.



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# File 'lib/sequent/core/helpers/message_router.rb', line 35

def match_message(message)
  result = Set.new
  result.merge(@instanceof_routes[message.class])
  @routes.each do |matcher, handlers|
    result.merge(handlers) if matcher.matches_message?(message)
  end
  result
end

#matches_message?(message) ⇒ Boolean

Returns true when there is at least one handler for the given message, or false otherwise.

Returns:



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# File 'lib/sequent/core/helpers/message_router.rb', line 47

def matches_message?(message)
  match_message(message).any?
end

#register_matchers(*matchers, handler) ⇒ Object

Registers a handler for the given matchers.

A matcher must implement #matches_message?(message) and return a truthy value when it matches, or a falsey value otherwise.



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# File 'lib/sequent/core/helpers/message_router.rb', line 22

def register_matchers(*matchers, handler)
  matchers.each do |matcher|
    if matcher.is_a?(MessageMatchers::InstanceOf)
      @instanceof_routes[matcher.expected_class] << handler
    else
      @routes[matcher] << handler
    end
  end
end