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RxJava and Guava Rx Client Providers.
+ cleaning up ext/rx (removing deprecated rx, rx-java8 and rx-jsr166e modules) Change-Id: I95c4f2f33931de793ed98dd0eda0044f792950a3
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186
...nt-webapp/src/main/java/org/glassfish/jersey/examples/rx/agent/FlowableAgentResource.java
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| /* | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | ||
| * | ||
| * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved. | ||
| * | ||
| * The contents of this file are subject to the terms of either the GNU | ||
| * General Public License Version 2 only ("GPL") or the Common Development | ||
| * and Distribution License("CDDL") (collectively, the "License"). You | ||
| * may not use this file except in compliance with the License. You can | ||
| * obtain a copy of the License at | ||
| * http://glassfish.java.net/public/CDDL+GPL_1_1.html | ||
| * or packager/legal/LICENSE.txt. See the License for the specific | ||
| * language governing permissions and limitations under the License. | ||
| * | ||
| * When distributing the software, include this License Header Notice in each | ||
| * file and include the License file at packager/legal/LICENSE.txt. | ||
| * | ||
| * GPL Classpath Exception: | ||
| * Oracle designates this particular file as subject to the "Classpath" | ||
| * exception as provided by Oracle in the GPL Version 2 section of the License | ||
| * file that accompanied this code. | ||
| * | ||
| * Modifications: | ||
| * If applicable, add the following below the License Header, with the fields | ||
| * enclosed by brackets [] replaced by your own identifying information: | ||
| * "Portions Copyright [year] [name of copyright owner]" | ||
| * | ||
| * Contributor(s): | ||
| * If you wish your version of this file to be governed by only the CDDL or | ||
| * only the GPL Version 2, indicate your decision by adding "[Contributor] | ||
| * elects to include this software in this distribution under the [CDDL or GPL | ||
| * Version 2] license." If you don't indicate a single choice of license, a | ||
| * recipient has the option to distribute your version of this file under | ||
| * either the CDDL, the GPL Version 2 or to extend the choice of license to | ||
| * its licensees as provided above. However, if you add GPL Version 2 code | ||
| * and therefore, elected the GPL Version 2 license, then the option applies | ||
| * only if the new code is made subject to such option by the copyright | ||
| * holder. | ||
| */ | ||
|
|
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| package org.glassfish.jersey.examples.rx.agent; | ||
|
|
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| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Queue; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
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|
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| 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.container.AsyncResponse; | ||
| import javax.ws.rs.container.Suspended; | ||
| import javax.ws.rs.core.GenericType; | ||
|
|
||
| import javax.inject.Singleton; | ||
|
|
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| import org.glassfish.jersey.client.rx.rxjava2.RxFlowableInvoker; | ||
| import org.glassfish.jersey.client.rx.rxjava2.RxFlowableInvokerProvider; | ||
| 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; | ||
|
|
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| import io.reactivex.Flowable; | ||
| import io.reactivex.schedulers.Schedulers; | ||
|
|
||
| /** | ||
| * Obtain information about visited (destination) and recommended (destination, forecast, price) places for "RxJava2" | ||
| * user. Uses RxJava2 Flowable and Jersey Client to obtain the data. | ||
| * | ||
| * @author Michal Gajdos | ||
| * @author Pavel Bucek (pavel.bucek at oracle.com) | ||
| */ | ||
| @Singleton | ||
| @Path("agent/flowable") | ||
| @Produces("application/json") | ||
| public class FlowableAgentResource { | ||
|
|
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| @Uri("remote/destination") | ||
| private WebTarget destination; | ||
|
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| @Uri("remote/calculation/from/{from}/to/{to}") | ||
| private WebTarget calculation; | ||
|
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| @Uri("remote/forecast/{destination}") | ||
| private WebTarget forecast; | ||
|
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| @GET | ||
| public void flowable(@Suspended final AsyncResponse async) { | ||
| final long time = System.nanoTime(); | ||
| final Queue<String> errors = new ConcurrentLinkedQueue<>(); | ||
|
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| Flowable.just(new AgentResponse()) | ||
| // Obtain visited destinations. | ||
| .zipWith(visited(errors), (agentResponse, visited) -> { | ||
| agentResponse.setVisited(visited); | ||
| return agentResponse; | ||
| }) | ||
| // Obtain recommended destinations. (does not depend on visited ones) | ||
| .zipWith( | ||
| recommended(errors), | ||
| (agentResponse, recommendations) -> { | ||
| agentResponse.setRecommended(recommendations); | ||
| return agentResponse; | ||
| }) | ||
| // Observe on another thread than the one processing visited or recommended destinations. | ||
| .observeOn(Schedulers.io()) | ||
| // Subscribe. | ||
| .subscribe(agentResponse -> { | ||
| agentResponse.setProcessingTime((System.nanoTime() - time) / 1000000); | ||
| async.resume(agentResponse); | ||
|
|
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| }, async::resume); | ||
| } | ||
|
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| private Flowable<List<Destination>> visited(final Queue<String> errors) { | ||
| destination.register(RxFlowableInvokerProvider.class); | ||
|
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| return destination.path("visited").request() | ||
| // Identify the user. | ||
| .header("Rx-User", "RxJava2") | ||
| // Reactive invoker. | ||
| .rx(RxFlowableInvoker.class) | ||
| // Return a list of destinations. | ||
| .get(new GenericType<List<Destination>>() { | ||
| }) | ||
| // Handle Errors. | ||
| .onErrorReturn(throwable -> { | ||
| errors.offer("Visited: " + throwable.getMessage()); | ||
| return Collections.emptyList(); | ||
| }); | ||
| } | ||
|
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| private Flowable<List<Recommendation>> recommended(final Queue<String> errors) { | ||
| destination.register(RxFlowableInvokerProvider.class); | ||
|
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| // Recommended places. | ||
| final Flowable<Destination> recommended = destination.path("recommended").request() | ||
| // Identify the user. | ||
| .header("Rx-User", "RxJava2") | ||
| // Reactive invoker. | ||
| .rx(RxFlowableInvoker.class) | ||
| // Return a list of destinations. | ||
| .get(new GenericType<List<Destination>>() { | ||
| }) | ||
| // Handle Errors. | ||
| .onErrorReturn(throwable -> { | ||
| errors.offer("Recommended: " + throwable | ||
| .getMessage()); | ||
| return Collections.emptyList(); | ||
| }) | ||
| // Emit destinations one-by-one. | ||
| .flatMap(Flowable::fromIterable) | ||
| // Remember emitted items for dependant requests. | ||
| .cache(); | ||
|
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| forecast.register(RxFlowableInvokerProvider.class); | ||
|
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| // Forecasts. (depend on recommended destinations) | ||
| final Flowable<Forecast> forecasts = recommended.flatMap(destination -> | ||
| forecast | ||
| .resolveTemplate("destination", destination.getDestination()) | ||
| .request().rx(RxFlowableInvoker.class).get(Forecast.class) | ||
| .onErrorReturn(throwable -> { | ||
| errors.offer("Forecast: " + throwable.getMessage()); | ||
| return new Forecast(destination.getDestination(), "N/A"); | ||
| })); | ||
|
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| calculation.register(RxFlowableInvokerProvider.class); | ||
|
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| // Calculations. (depend on recommended destinations) | ||
| final Flowable<Calculation> calculations = recommended.flatMap(destination -> { | ||
| return calculation.resolveTemplate("from", "Moon").resolveTemplate("to", destination.getDestination()) | ||
| .request().rx(RxFlowableInvoker.class).get(Calculation.class) | ||
| .onErrorReturn(throwable -> { | ||
| errors.offer("Calculation: " + throwable.getMessage()); | ||
| return new Calculation("Moon", destination.getDestination(), -1); | ||
| }); | ||
| }); | ||
|
|
||
| return Flowable.zip(recommended, forecasts, calculations, Recommendation::new).buffer(Integer.MAX_VALUE); | ||
| } | ||
| } |
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