localytics_ltv_conversion_async.java

/*
Requires Unirest. Available via Maven/Gradle: http://mvnrepository.com/artifact/com.mashape.unirest/unirest-java/1.3.0
*/

import com.mashape.unirest.http.*;
import com.mashape.unirest.http.async.Callback;
import com.mashape.unirest.http.exceptions.UnirestException;
import org.json.JSONObject;
import java.util.concurrent.Future;

public class LLCurrencyConversion {

    //in main method for proof of concept, you can wrap this in your own method to pass params into
    public static void main (String args []) {

        final double value = 19.99; // value of event in original currency

        String base = "GBP"; // currency to convert into USD

        String url = "https://api.fixer.io/latest" +
                "?base=" + base +
                "&symbols=USD";

        System.out.println(url);

        // using future to be non-blocking when making request
        Future<HttpResponse<JsonNode>> future = Unirest.get(url)
                .asJsonAsync(new Callback<JsonNode>() {

                    public void failed(UnirestException e) {
                        System.out.println("The request has failed");
                    }

                    public void completed(HttpResponse<JsonNode> response) {

                        System.out.println("The request has been successful");

                        //parse out the conversion multiplier
                        JSONObject myObj = response.getBody().getObject();
                        JSONObject rateObject = myObj.getJSONObject("rates");
                        String rate = rateObject.get("USD").toString();

                        //convert to numerical value
                        double multiplier = Double.parseDouble(rate);

                        //multiply by base currency rate and convert to US cents
                        Double convertedValue = (multiplier * value * 100);

                        Map<String, String> values = new HashMap<String, String>();
                        values.put("Item Name", "T-Shirt");
                        Localytics.tagEvent("Item Purchased", values, convertedValue);

                    }

                    public void cancelled() {
                        System.out.println("The request has been cancelled");
                    }

                });

    }

}