Class: OpenBEL::Storage::CacheProxy

Inherits:
Object
  • Object
show all
Includes:
TripleStorage
Defined in:
lib/openbel/api/storage/cache_proxy.rb

Instance Method Summary collapse

Methods included from TripleStorage

#all, #object, #predicate, #subject

Constructor Details

#initialize(real_storage, cache) ⇒ CacheProxy

Returns a new instance of CacheProxy.



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# File 'lib/openbel/api/storage/cache_proxy.rb', line 8

def initialize(real_storage, cache)
  if !real_storage or !real_storage.respond_to?(:triples)
    fail ArgumentError, "real_storage is invalid."
  end
  if !cache or !cache.respond_to?(:[])
    fail ArgumentError, "cache is invalid."
  end
  @real_storage = real_storage
  @cache = cache
end

Instance Method Details

#triples(subject, predicate, object, options = {}) ⇒ Object 



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# File 'lib/openbel/api/storage/cache_proxy.rb', line 19

def triples(subject, predicate, object, options={})
  pattern_key = key(subject, predicate, object)
  rdf_value = @cache[pattern_key]
  map_method = options.delete(:only)
  if rdf_value
    return [] if rdf_value == ""
    triples = unpack(rdf_value).each_slice(3)
  else
    triples = @real_storage.triples(subject, predicate, object, options).to_a
    if triples.empty?
      @cache[pattern_key] = ""
    else
      rdf_value = triples.map { |stmt|
        [subject(stmt), predicate(stmt), object(stmt)]
      }.flatten
      @cache[pattern_key] = pack(rdf_value)
    end
    triples
  end

  map_method = if map_method && @real_storage.respond_to?(map_method)
                 @real_storage.method(map_method)
               else
                 @real_storage.method(:all)
               end
  if block_given?
    triples.each { |triple| yield map_method.call(triple) }
  else
    triples = triples.respond_to?(:lazy) ? triples.lazy : triples
    triples.map { |triple| map_method.call(triple) }
  end
end