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package org.glassfish.jersey.examples.rx.agent;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.container.Suspended;
import javax.ws.rs.core.GenericType;
import javax.inject.Singleton;
import org.glassfish.jersey.client.rx.RxWebTarget;
import org.glassfish.jersey.client.rx.rxjava.RxObservable;
import org.glassfish.jersey.client.rx.rxjava.RxObservableInvoker;
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;
import rx.Observable;
import rx.functions.Action1;
import rx.functions.Func1;
import rx.functions.Func2;
import rx.functions.Func3;
import rx.schedulers.Schedulers;
/**
* Obtain information about visited (destination) and recommended (destination, forecast, price) places for "RxJava" user. Uses
* RxJava Observable and Jersey Client to obtain the data.
*
* @author Michal Gajdos (michal.gajdos at oracle.com)
*/
@Singleton
@Path("agent/observable")
@Produces("application/json")
public class ObservableAgentResource {
@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 void observable(@Suspended final AsyncResponse async) {
final long time = System.nanoTime();
Observable.just(new AgentResponse())
// Obtain visited destinations.
.zipWith(visited(), new Func2<AgentResponse, List<Destination>, AgentResponse>() {
@Override
public AgentResponse call(final AgentResponse agentResponse, final List<Destination> destinations) {
agentResponse.setVisited(destinations);
return agentResponse;
}
})
// Obtain recommended destinations. (does not depend on visited ones)
.zipWith(recommended(), new Func2<AgentResponse, List<Recommendation>, AgentResponse>() {
@Override
public AgentResponse call(final AgentResponse agentResponse, final List<Recommendation> recommendations) {
agentResponse.setRecommended(recommendations);
return agentResponse;
}
})
// Observe on another thread than the one processing visited or recommended destinations.
.observeOn(Schedulers.io())
// Subscribe.
.subscribe(new Action1<AgentResponse>() {
@Override
public void call(final AgentResponse agentResponse) {
agentResponse.setProcessingTime((System.nanoTime() - time) / 1000000);
async.resume(agentResponse);
}
}, new Action1<Throwable>() {
@Override
public void call(final Throwable throwable) {
async.resume(throwable);
}
});
}
private Observable<List<Destination>> visited() {
return RxObservable.from(destination).path("visited").request()
// Identify the user.
.header("Rx-User", "RxJava")
// Reactive invoker.
.rx()
// Return a list of destinations.
.get(new GenericType<List<Destination>>() {});
}
private Observable<List<Recommendation>> recommended() {
// Recommended places.
final Observable<Destination> recommended = RxObservable.from(destination).path("recommended").request()
// Identify the user.
.header("Rx-User", "RxJava")
// Reactive invoker.
.rx()
// Return a list of destinations.
.get(new GenericType<List<Destination>>() {})
// Emit destinations one-by-one.
.flatMap(new Func1<List<Destination>, Observable<Destination>>() {
@Override
public Observable<Destination> call(final List<Destination> destinations) {
return Observable.from(destinations);
}
})
// Remember emitted items for dependant requests.
.cache();
// Forecasts. (depend on recommended destinations)
final RxWebTarget<RxObservableInvoker> rxForecast = RxObservable.from(forecast);
final Observable<Forecast> forecasts = recommended.flatMap(new Func1<Destination, Observable<Forecast>>() {
@Override
public Observable<Forecast> call(final Destination destination) {
return rxForecast.resolveTemplate("destination", destination.getDestination())
.request().rx().get(Forecast.class);
}
});
// Calculations. (depend on recommended destinations)
final RxWebTarget<RxObservableInvoker> rxCalculation = RxObservable.from(calculation);
final Observable<Calculation> calculations = recommended.flatMap(new Func1<Destination, Observable<Calculation>>() {
@Override
public Observable<Calculation> call(final Destination destination) {
return rxCalculation.resolveTemplate("from", "Moon").resolveTemplate("to", destination.getDestination())
.request().rx().get(Calculation.class);
}
});
return Observable.zip(recommended, forecasts, calculations, new Func3<Destination, Forecast, Calculation, Recommendation>() {
@Override
public Recommendation call(final Destination destination, final Forecast forecast, final Calculation calculation) {
return new Recommendation(destination.getDestination(), forecast.getForecast(), calculation.getPrice());
}
}).toList();
}
}