Class: NatsWork::Server::MiddlewareChain

Inherits:
Object
  • Object
show all
Defined in:
lib/natswork/middleware_chain.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MiddlewareChain

Returns a new instance of MiddlewareChain.



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# File 'lib/natswork/middleware_chain.rb', line 6

def initialize
  @entries = []
end

Instance Method Details

#add(middleware, *args) ⇒ Object 



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# File 'lib/natswork/middleware_chain.rb', line 10

def add(middleware, *args)
  @entries << [middleware, args]
  self
end

#clear ⇒ Object 



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# File 'lib/natswork/middleware_chain.rb', line 31

def clear
  @entries.clear
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/natswork/middleware_chain.rb', line 35

def empty?
  @entries.empty?
end

#invoke(*args) ⇒ Object 



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# File 'lib/natswork/middleware_chain.rb', line 15

def invoke(*args)
  chain = @entries.map do |middleware, options|
    middleware.new(*options)
  end

  traverse_chain = lambda do
    if chain.empty?
      yield if block_given?
    else
      chain.shift.call(*args, &traverse_chain)
    end
  end

  traverse_chain.call
end