Class: Giraph::Resolver

Inherits:
Object
  • Object
show all
Defined in:
lib/giraph/resolver.rb

Overview

Proc-like class to allow declerative links to external resolution handlers (so the “definition” gem can stay pure resolution-wise)

Defined Under Namespace

Classes: UnknownOperation

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(method_name) ⇒ Resolver

Returns a new instance of Resolver.



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# File 'lib/giraph/resolver.rb', line 11

def initialize(method_name)
  @method_name = method_name
end

Class Method Details

.for(method_name) ⇒ Object 



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# File 'lib/giraph/resolver.rb', line 7

def self.for(method_name)
  new(method_name)
end

Instance Method Details

#call(obj, args, ctx) ⇒ Object

Resolves the field by calling the previously given method on the registered Resolver object for the current operation type (currently query or mutation)



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# File 'lib/giraph/resolver.rb', line 18

def call(obj, args, ctx)
  # Find out operation type (query, mutation, etc.)
  op_type = ctx.query.selected_operation.operation_type.to_sym

  # Ensure there is a registered resolver for it
  unless (resolver = ctx[:__giraph_resolver__][op_type])
    raise UnknownOperation, "No resolver found for '#{op_type}' op type"
  end

  # Call the requested method on resolver
  resolver.public_send(@method_name, obj, args, ctx)
end