Class: Hanami::Events::CloudPubsub::Middleware::Stack

Inherits:
Object
  • Object
show all
Defined in:
lib/hanami/events/cloud_pubsub/middleware/stack.rb

Overview

Middleware which is invoked when a message is received

Defined Under Namespace

Classes: InvalidMiddlewareError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*entries) {|_self| ... } ⇒ Stack

Returns a new instance of Stack.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/hanami/events/cloud_pubsub/middleware/stack.rb', line 21

def initialize(*entries)
  entries.each(&method(:ensure_callable))
  @entries = 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/hanami/events/cloud_pubsub/middleware/stack.rb', line 19

def entries
  @entries
end

Instance Method Details

#<<(middleware) ⇒ Object 



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# File 'lib/hanami/events/cloud_pubsub/middleware/stack.rb', line 27

def <<(middleware)
  ensure_callable(middleware)
  entries << middleware
  self
end

#invoke(*args, **kwargs) ⇒ Object 



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# File 'lib/hanami/events/cloud_pubsub/middleware/stack.rb', line 43

def invoke(*args, **kwargs)
  stack = entries.dup

  traverse_stack = proc do |**opts|
    if stack.empty?
      yield(*args, **kwargs, **opts)
    else
      stack.shift.call(*args, **kwargs, **opts, &traverse_stack)
    end
  end

  traverse_stack.call
end

#prepend(middleware) ⇒ Object 



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# File 'lib/hanami/events/cloud_pubsub/middleware/stack.rb', line 33

def prepend(middleware)
  ensure_callable(middleware)
  entries.insert 0, middleware
  self
end

#shift ⇒ Object 



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# File 'lib/hanami/events/cloud_pubsub/middleware/stack.rb', line 39

def shift
  @entries.shift
end