Class: Amazon::WebServices::MechanicalTurkRequester

Inherits:
Util::ConvenienceWrapper show all
Defined in:
lib/amazon/webservices/mechanical_turk_requester.rb

Constant Summary collapse

WSDL_VERSION = 
"2012-03-25"
ABANDONMENT_RATE_QUALIFICATION_TYPE_ID = 
"00000000000000000070"
APPROVAL_RATE_QUALIFICATION_TYPE_ID = 
"000000000000000000L0"
REJECTION_RATE_QUALIFICATION_TYPE_ID = 
"000000000000000000S0"
RETURN_RATE_QUALIFICATION_TYPE_ID = 
"000000000000000000E0"
SUBMISSION_RATE_QUALIFICATION_TYPE_ID = 
"00000000000000000000"
LOCALE_QUALIFICATION_TYPE_ID = 
"00000000000000000071"
DEFAULT_THREADCOUNT = 
10

Constants inherited from Util::ConvenienceWrapper

Util::ConvenienceWrapper::REQUIRED_PARAMETERS

Instance Method Summary collapse

Methods inherited from Util::ConvenienceWrapper

#callService, #method_missing, paginate, real_method, serviceCall

Methods included from Util::Logging

#log, #set_log

Constructor Details

#initialize(args = {}) ⇒ MechanicalTurkRequester

Returns a new instance of MechanicalTurkRequester.



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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 99

def initialize(args={})
  newargs = args.dup
  unless args[:Config].nil?
    if args[:Config] == :Rails
      rails_config = Amazon::Util::DataReader.load( File.join(::RAILS_ROOT,'config','mturk.yml'), :YAML )
      newargs = args.merge rails_config[::RAILS_ENV].inject({})  {|a,b| a[b[0].to_sym] = b[1] ; a }
    else
      loaded = Amazon::Util::DataReader.load( args[:Config], :YAML )
      newargs = args.merge loaded.inject({}) {|a,b| a[b[0].to_sym] = b[1] ; a }
    end
  end
  @threadcount = args[:ThreadCount].to_i
  @threadcount = DEFAULT_THREADCOUNT unless @threadcount >= 1
  raise "Cannot override WSDL version ( #{WSDL_VERSION} )" unless args[:Version].nil? or args[:Version].equals? WSDL_VERSION
  super newargs.merge( :Name => :AWSMechanicalTurkRequester,
                       :ServiceClass => Amazon::WebServices::MechanicalTurk,
                       :Version => WSDL_VERSION )
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Amazon::WebServices::Util::ConvenienceWrapper

Instance Method Details

#availableFunds ⇒ Object

Returns available funds in USD Calls getAccountBalance and parses out the correct amount



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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 255

def availableFunds
  return getAccountBalance[:AvailableBalance][:Amount]
end

#createHITs(hit_template, question_template, hit_data_set) ⇒ Object

Create a series of similar HITs, sharing common parameters. Utilizes HITType

  • hit_template is the array of parameters to pass to createHIT.
  • question_template will be passed as a template into ERB to generate the :Question parameter
  • the RequesterAnnotation parameter of hit_template will also be passed through ERB
  • hit_data_set should consist of an array of hashes defining unique instance variables utilized by question_template


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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 123

def createHITs( hit_template, question_template, hit_data_set )
  hit_template = hit_template.dup
  lifetime = hit_template[:LifetimeInSeconds]
  numassignments_template = hit_template[:MaxAssignments]
  annotation_template = hit_template[:RequesterAnnotation]
  hit_template.delete :LifetimeInSeconds
  hit_template.delete :MaxAssignments
  hit_template.delete :RequesterAnnotation

  ht = hit_template[:HITTypeId] || registerHITType( hit_template )[:HITTypeId]

  tp = Amazon::Util::ThreadPool.new @threadcount

  created = [].extend(MonitorMixin)
  failed = [].extend(MonitorMixin)
  hit_data_set.each do |hd|
    tp.addWork(hd) do |hit_data|
      begin
        b = Amazon::Util::Binder.new( hit_data )
        annotation = annotation_template.nil? ? nil : b.erb_eval( annotation_template )
        numassignments = numassignments_template.nil? ? nil : b.erb_eval( numassignments_template.to_s ).to_i
        question = b.erb_eval( question_template )
        result = self.createHIT( :HITTypeId => ht,
                                 :LifetimeInSeconds => lifetime,
                                 :MaxAssignments => ( hit_data[:MaxAssignments] || numassignments || 1 ),
                                 :Question => question,
                                 :RequesterAnnotation => ( hit_data[:RequesterAnnotation] || annotation || "")
                               )
        created.synchronize do
          created << result
        end
      rescue => e
        failed.synchronize do
          failed << hit_data.merge( :Error => e.message )
        end
      end
    end # tp.addWork
  end # hit_data_set.each
  tp.finish

  return :Created => created, :Failed => failed
end

#getHITResults(list) ⇒ Object 



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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 236

def getHITResults( list )
  results = [].extend(MonitorMixin)
  tp = Amazon::Util::ThreadPool.new @threadcount
  list.each do |line|
    tp.addWork(line) do |h|
      hit = getHIT( :HITId => h[:HITId] )
      getAssignmentsForHITAll( :HITId => h[:HITId] ).each {|assignment|
        results.synchronize do
          results << ( hit.merge( assignment ) )
        end
      }
    end
  end
  tp.finish
  results.flatten
end

#simplifyAnswer(answerXML) ⇒ Object

helper function to simplify answer XML



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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 260

def simplifyAnswer( answerXML )
  answerHash = Amazon::WebServices::Util::XMLSimplifier.simplify REXML::Document.new(answerXML)
  list = [answerHash[:Answer]].flatten
  list.inject({}) { |answers, answer|
    id = answer[:QuestionIdentifier]
    result = answer[:FreeText] || answer[:SelectionIdentifier] || answer[:UploadedFileKey]
    answers[id] = result
    answers
  }
end

#updateHIT(hit_id, hit_template) ⇒ Object

Update a HIT with new properties.

hit_id

Id of the HIT to update

hit_template

hash ( parameter => value ) of parameters to update

Acceptable attributes:

  • Title
  • Description
  • Keywords
  • Reward
  • QualificationRequirement
  • AutoApprovalDelayInSeconds
  • AssignmentDurationInSeconds

Behind the scenes, this function retrieves the HIT, merges the HITs current attributes with any you specify, and registers a new HIT Template. It then uses the new ChangeHITTypeOfHIT function to move your HIT to the newly-created HIT Template.



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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 217

def updateHIT( hit_id, hit_template )
  hit_template = hit_template.dup

  hit = getHIT( :HITId => hit_id )

  props = %w( Title Description Keywords Reward QualificationRequirement
              AutoApprovalDelayInSeconds AssignmentDurationInSeconds
            ).collect {|str| str.to_sym }

  props.each do |p|
    hit_template[p] = hit[p] if hit_template[p].nil?
  end

  hit_type_id = registerHITType( hit_template )[:HITTypeId]

  changeHITTypeOfHIT( :HITId => hit_id, :HITTypeId => hit_type_id )
end

#updateHITs(hit_template, hit_ids) ⇒ Object

Update a series of HITs to belong to a new HITType

  • hit_template is the array of parameters to pass to registerHITType
  • hit_ids is a list of HITIds (strings)


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# File 'lib/amazon/webservices/mechanical_turk_requester.rb', line 169

def updateHITs( hit_template, hit_ids )
  hit_template = hit_template.dup
  hit_template.delete :LifetimeInSeconds
  hit_template.delete :RequesterAnnotation

  hit_type_id = registerHITType( hit_template )[:HITTypeId]

  tp = Amazon::Util::ThreadPool.new @threadcount

  updated = [].extend(MonitorMixin)
  failed = [].extend(MonitorMixin)
  hit_ids.each do |hid|
    tp.addWork(hid) do |hit_id|
      begin
        changeHITTypeOfHIT( :HITId => hit_id, :HITTypeId => hit_type_id )
        updated.synchronize do
          updated << hit_id
        end
      rescue => e
        failed.synchronize do
          failed << { :HITId => hit_id, :Error => e.message }
        end
      end
    end # tp.addWork
  end # hit_ids.each
  tp.finish

  return :Updated => updated, :Failed => failed
end