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ReactorCallAdapterFactory.java
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ReactorCallAdapterFactory.java
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/*
* Copyright (C) 2015 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jakewharton.retrofit2.adapter.reactor;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Scheduler;
import retrofit2.CallAdapter;
import retrofit2.Response;
import retrofit2.Retrofit;
/**
* A {@linkplain CallAdapter.Factory call adapter} which uses Project Reactor for creating streams.
* <p>
* Adding this class to {@link Retrofit} allows you to return a {@link Flux} or {@link Mono} from
* service methods.
* <pre><code>
* interface MyService {
* @GET("user/me")
* Flux<User> getUser()
* }
* </code></pre>
* There are three configurations supported for the {@code Flux} or {@code Mono} type
* parameter:
* <ul>
* <li>Direct body (e.g., {@code Flux<User>}) calls {@code onNext} with the deserialized body for
* 2XX responses and calls {@code onError} with {@link retrofit2.HttpException} for non-2XX
* responses and {@link IOException} for network errors.</li>
* <li>Response wrapped body (e.g., {@code Flux<Response<User>>}) calls {@code onNext} with a
* {@link Response} object for all HTTP responses and calls {@code onError} with {@link IOException}
* for network errors</li>
* <li>Result wrapped body (e.g., {@code Flux<Result<User>>}) calls {@code onNext} with a
* {@link Result} object for all HTTP responses and errors.</li>
* </ul>
*/
public final class ReactorCallAdapterFactory extends CallAdapter.Factory {
/**
* Returns an instance which creates synchronous observables that do not operate on any scheduler
* by default.
*/
public static ReactorCallAdapterFactory create() {
return new ReactorCallAdapterFactory(null, false);
}
/**
* Returns an instance which creates asynchronous observables. Applying
* {@link Flux#subscribeOn} has no effect on stream types created by this factory.
*/
public static ReactorCallAdapterFactory createAsync() {
return new ReactorCallAdapterFactory(null, true);
}
/**
* Returns an instance which creates synchronous observables that
* {@linkplain Flux#publishOn(Scheduler) publishes on} {@code scheduler} by default.
*/
public static ReactorCallAdapterFactory createWithScheduler(Scheduler scheduler) {
if (scheduler == null) throw new NullPointerException("scheduler == null");
return new ReactorCallAdapterFactory(scheduler, false);
}
private final Scheduler scheduler;
private final boolean isAsync;
private ReactorCallAdapterFactory(Scheduler scheduler, boolean isAsync) {
this.scheduler = scheduler;
this.isAsync = isAsync;
}
@Override
public CallAdapter<?, ?> get(Type returnType, Annotation[] annotations, Retrofit retrofit) {
Class<?> rawType = getRawType(returnType);
boolean isMono = rawType == Mono.class;
if (rawType != Flux.class && !isMono) {
return null;
}
boolean isResult = false;
boolean isBody = false;
Type responseType;
if (!(returnType instanceof ParameterizedType)) {
String name = isMono ? "Mono" : "Flux";
throw new IllegalStateException(name + " return type must be parameterized"
+ " as " + name + "<Foo> or " + name + "<? extends Foo>");
}
Type observableType = getParameterUpperBound(0, (ParameterizedType) returnType);
Class<?> rawObservableType = getRawType(observableType);
if (rawObservableType == Response.class) {
if (!(observableType instanceof ParameterizedType)) {
throw new IllegalStateException("Response must be parameterized"
+ " as Response<Foo> or Response<? extends Foo>");
}
responseType = getParameterUpperBound(0, (ParameterizedType) observableType);
} else if (rawObservableType == Result.class) {
if (!(observableType instanceof ParameterizedType)) {
throw new IllegalStateException("Result must be parameterized"
+ " as Result<Foo> or Result<? extends Foo>");
}
responseType = getParameterUpperBound(0, (ParameterizedType) observableType);
isResult = true;
} else {
responseType = observableType;
isBody = true;
}
return new ReactorCallAdapter(responseType, scheduler, isAsync, isResult, isBody, isMono);
}
}