Class: Creeper::Middleware::Chain

Inherits:
Object
  • Object
show all
Defined in:
lib/creeper/middleware/chain.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize {|_self| ... } ⇒ Chain

Returns a new instance of Chain.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/creeper/middleware/chain.rb', line 50

def initialize
  @entries = []
  yield self if block_given?
end

Instance Attribute Details

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/creeper/middleware/chain.rb', line 48

def entries
  @entries
end

Instance Method Details

#add(klass, *args) ⇒ Object 



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# File 'lib/creeper/middleware/chain.rb', line 59

def add(klass, *args)
  entries << Entry.new(klass, *args) unless exists?(klass)
end

#clear ⇒ Object 



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# File 'lib/creeper/middleware/chain.rb', line 71

def clear
  entries.clear
end

#exists?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/creeper/middleware/chain.rb', line 63

def exists?(klass)
  entries.any? { |entry| entry.klass == klass }
end

#invoke(*args, &final_action) ⇒ Object 



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# File 'lib/creeper/middleware/chain.rb', line 75

def invoke(*args, &final_action)
  chain = retrieve.dup
  traverse_chain = lambda do
    if chain.empty?
      final_action.call
    else
      chain.shift.call(*args, &traverse_chain)
    end
  end
  traverse_chain.call
end

#remove(klass) ⇒ Object 



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# File 'lib/creeper/middleware/chain.rb', line 55

def remove(klass)
  entries.delete_if { |entry| entry.klass == klass }
end

#retrieve ⇒ Object 



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# File 'lib/creeper/middleware/chain.rb', line 67

def retrieve
  entries.map(&:make_new)
end