Exposing your application as a service.

You have an available sample of exposing an HTTP service within the file lib/server.rb. Usually, you only need to create a Sinatra POST method that wraps the call for the application you created in the previous step. You can customize the context where you want your service to be deployed:

set :port, 5000

post '/sentiment' do
  content_type :json
  data = JSON.load(request.body.read)
  text = data["input"]
  sentiment = sentiment_analyzer.calculate_sentiment(text)
  p "Calculated sentiment: #{sentiment}"
  response = {"@context"=> "http://eurosentiment.eu/contexts/basecontext.jsonld",
                "@type"=> "marl:SentimentAnalysis",
                "marl:polarityValue"=> sentiment}
  response.to_json
end

In the given example, the final service will be exposed at http://0.0.0.0:5000/sentiment (as specified in the code) and it will accept POST requests, returning a JSON NIF result.