Class: FtrRuby::FDPIndex

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

Constant Summary collapse

CACHE_DIR =

Cache directory and expiry time (in seconds, e.g., 24 hours)

File.join(Dir.pwd, "cache", "rdf_repositories")
CACHE_EXPIRY =

24 hours in seconds

240 * 60 * 60

Class Method Summary collapse

Class Method Details

.get_metrics_labels_for_tests(tests:) ⇒ Object 



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# File 'lib/fdp_index.rb', line 71

def self.get_metrics_labels_for_tests(tests:)
  labels = {}
  cache = {} # In-memory cache for this request

  # Ensure cache directory exists
  FileUtils.mkdir_p(CACHE_DIR)

  tests.each do |test|
    metric = test[:benchmark_or_metric] # Assume required
    warn "Processing metric: #{metric}"

    # Generate a safe filename for the metric URL
    cache_key = Digest::SHA256.hexdigest(metric)
    cache_file = File.join(CACHE_DIR, "#{cache_key}.bin")

    # Check in-memory cache first
    if cache[metric]
      repository = cache[metric]
    else
      # Try to load from disk cache
      repository = load_from_cache(cache_file)
      if repository
        warn "Loaded #{metric} from cache"
      else
        # Cache miss: fetch from URL
        warn "Fetching RDF for #{metric}"
        repository = RDF::Repository.new
        headers = { "Accept" => "application/ld+json" }
        begin
          RDF::Reader.open(metric, headers: headers) do |reader|
            repository << reader
          end
          # Save to disk cache with timestamp
          save_to_cache(cache_file, repository)
          warn "Cached #{metric} to disk"
        rescue StandardError => e
          warn "Error fetching RDF for #{metric}: #{e.message}"
          labels[metric] = "Unable to resolve #{metric} to RDF metadata"
          next
        end
      end
      cache[metric] = repository # Store in memory for this request
    end

    # SPARQL query to get label
    fdpindexquery = <<-METRICLABEL
      PREFIX dct: <http://purl.org/dc/terms/>
      PREFIX schema: <http://schema.org/>
      SELECT DISTINCT ?label WHERE {
        { ?sub dct:title ?label }
        UNION
        { ?sub schema:name ?label }
      }
    METRICLABEL

    # Parse and execute the SPARQL query
    fdpindexquery = SPARQL.parse(fdpindexquery)
    results = fdpindexquery.execute(repository)

    # Assign the label (first result or fallback)
    labels[metric] = if results&.first&.[](:label)&.to_s&.length&.positive?
                       results.first[:label].to_s
                     else
                       "Unnamed Metric"
                     end
  end

  labels
end

.load_from_cache(cache_file) ⇒ Object

Load RDF::Repository from disk cache if not expired



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# File 'lib/fdp_index.rb', line 142

def self.load_from_cache(cache_file)
  return nil unless File.exist?(cache_file)

  # Read timestamp and serialized data
  File.open(cache_file, "rb") do |file|
    timestamp = Marshal.load(file)
    if Time.now - timestamp < CACHE_EXPIRY
      return Marshal.load(file) # Return cached RDF::Repository
    end
  end
  nil # Cache expired or invalid
rescue StandardError => e
  warn "Error loading cache from #{cache_file}: #{e.message}"
  nil
end

.retrieve_tests_from_index(indexendpoint: "https://tools.ostrails.eu/repositories/fdpindex-fdp") ⇒ Object 



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# File 'lib/fdp_index.rb', line 16

def self.retrieve_tests_from_index(indexendpoint: "https://tools.ostrails.eu/repositories/fdpindex-fdp")
  sparql = SPARQL::Client.new(indexendpoint)

  fdpindexquery = <<EOQUERY
  PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  PREFIX dqv: <http://www.w3.org/ns/dqv#>
  PREFIX dct: <http://purl.org/dc/terms/>
  PREFIX dcat: <http://www.w3.org/ns/dcat#>
  PREFIX sio: <http://semanticscience.org/resource/>
  PREFIX dpv: <http://www.w3.org/ns/dpv#>
  PREFIX ftr: <https://w3id.org/ftr#>
  SELECT distinct ?sub ?identifier ?title ?description ?endpoint ?openapi ?dimension ?objects ?domain ?benchmark_or_metric WHERE {
    ?sub a <https://w3id.org/ftr#Test> ;
        dct:title ?title ;
        dct:description ?description ;
        dct:identifier ?identifier .
        OPTIONAL {?sub dpv:isApplicableFor ?objects }
        OPTIONAL {?sub ftr:applicationArea ?domain  }
        OPTIONAL {?sub sio:SIO_000233 ?benchmark_or_metric  }  # implementation of#{"            "}
        OPTIONAL {?sub dcat:endpointDescription ?openapi }
        OPTIONAL {?sub dcat:endpointURL ?endpoint }
        OPTIONAL {?sub dqv:inDimension ?dimension }
  }#{" "}
EOQUERY

  alltests = []

  begin
    # Execute the query
    results = sparql.query(fdpindexquery)

    # Process the results
    results.each_solution do |solution|
      test_object = {
        subj: solution[:sub]&.to_s,
        identifier: solution[:identifier]&.to_s,
        title: solution[:title]&.to_s,
        description: solution[:description]&.to_s,
        endpoint: solution[:endpoint]&.to_s,
        openapi: solution[:openapi]&.to_s,
        dimension: solution[:dimension]&.to_s,
        objects: solution[:objects]&.to_s,
        domain: solution[:domain]&.to_s,
        benchmark_or_metric: solution[:benchmark_or_metric]&.to_s
      }
      alltests << test_object
    end
  rescue StandardError => e
    puts "Error executing SPARQL query: #{e.message}"
  end

  alltests
end

.save_to_cache(cache_file, repository) ⇒ Object

Save RDF::Repository to disk cache with timestamp



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# File 'lib/fdp_index.rb', line 159

def self.save_to_cache(cache_file, repository)
  File.open(cache_file, "wb") do |file|
    Marshal.dump(Time.now, file) # Store timestamp
    Marshal.dump(repository, file) # Store repository
  end
rescue StandardError => e
  warn "Error saving cache to #{cache_file}: #{e.message}"
end