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package org.glassfish.jersey.examples.rx.agent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.GenericType;
import org.glassfish.jersey.examples.rx.domain.AgentResponse;
import org.glassfish.jersey.examples.rx.domain.Calculation;
import org.glassfish.jersey.examples.rx.domain.Destination;
import org.glassfish.jersey.examples.rx.domain.Forecast;
import org.glassfish.jersey.examples.rx.domain.Recommendation;
import org.glassfish.jersey.server.Uri;
/**
* Obtain information about visited (destination) and recommended (destination, forecast, price) places for "Sync" user. Uses
* standard JAX-RS sync approach to obtain the data.
*
* @author Michal Gajdos
*/
@Path("agent/sync")
@Produces("application/json")
public class SyncAgentResource {
@Uri("remote/destination")
private WebTarget destination;
@Uri("remote/calculation/from/{from}/to/{to}")
private WebTarget calculation;
@Uri("remote/forecast/{destination}")
private WebTarget forecast;
@GET
public AgentResponse sync() {
final long time = System.nanoTime();
final AgentResponse response = new AgentResponse();
final Queue<String> errors = new ConcurrentLinkedQueue<>();
// Obtain visited destinations.
try {
response.setVisited(destination.path("visited").request()
// Identify the user.
.header("Rx-User", "Sync")
// Return a list of destinations
.get(new GenericType<List<Destination>>() {}));
} catch (final Throwable throwable) {
errors.offer("Visited: " + throwable.getMessage());
}
// Obtain recommended destinations. (does not depend on visited ones)
List<Destination> recommended = Collections.emptyList();
try {
recommended = destination.path("recommended").request()
// Identify the user.
.header("Rx-User", "Sync")
// Return a list of destinations.
.get(new GenericType<List<Destination>>() {});
} catch (final Throwable throwable) {
errors.offer("Recommended: " + throwable.getMessage());
}
// Forecasts. (depend on recommended destinations)
final Map<String, Forecast> forecasts = new HashMap<>();
for (final Destination dest : recommended) {
try {
forecasts.put(dest.getDestination(),
forecast.resolveTemplate("destination", dest.getDestination()).request().get(Forecast.class));
} catch (final Throwable throwable) {
errors.offer("Forecast: " + throwable.getMessage());
}
}
// Calculations. (depend on recommended destinations)
final Map<String, Calculation> calculations = new HashMap<>();
recommended.stream().forEach(destination -> {
try {
calculations.put(destination.getDestination(), calculation.resolveTemplate("from", "Moon")
.resolveTemplate("to", destination.getDestination())
.request().get(Calculation.class));
} catch (final Throwable throwable) {
errors.offer("Calculation: " + throwable.getMessage());
}
});
// Recommendations.
final List<Recommendation> recommendations = new ArrayList<>(recommended.size());
for (final Destination dest : recommended) {
final Forecast fore = forecasts.get(dest.getDestination());
final Calculation calc = calculations.get(dest.getDestination());
recommendations.add(new Recommendation(dest.getDestination(),
fore != null ? fore.getForecast() : "N/A", calc != null ? calc.getPrice() : -1));
}
// Do something with errors.
// ...
response.setRecommended(recommendations);
response.setProcessingTime((System.nanoTime() - time) / 1000000);
return response;
}
}