Class: Giraph::Remote::Query

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

Overview

Field resolver to plug a remote GraphQL query root into a local type

Direct Known Subclasses

Mutation

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(endpoint, connector, &block) ⇒ Query

Returns a new instance of Query.



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# File 'lib/giraph/remote/query.rb', line 13

def initialize(endpoint, connector, &block)
  @endpoint = endpoint
  @evaluator = block || method(:default_evaluator)
  @connector = connector
end

Class Method Details

.bind(endpoint, &block) ⇒ Object 



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# File 'lib/giraph/remote/query.rb', line 5

def self.bind(endpoint, &block)
  new(
    endpoint,
    Remote::Connector.new(endpoint),
    &block
  )
end

Instance Method Details

#call(obj, args, ctx) ⇒ Object

Reconstructs a valid GraphQL root-query from the current field in question, including all variables and params, hands over to connector to execute remotely.



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# File 'lib/giraph/remote/query.rb', line 22

def call(obj, args, ctx)
  # Given an evaluator block, continue if only it evaluates to non-nil!
  return unless (remote_root = @evaluator.call(obj, args, ctx))

  subquery = Subquery.new(ctx)

  # Continue with remote query execution
  connector.resolve(
    ctx,
    query_string(subquery),
    query_variables(subquery, remote_root)
  )
end