/*
* Copyright 2002-2016 the original author or authors.
*
* 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 org.springframework.http.server.reactive;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.junit.Before;
import org.junit.Test;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.publisher.Signal;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
/**
* @author Rossen Stoyanchev
* @author Stephane Maldini
*/
public class ChannelSendOperatorTests {
private OneByOneAsyncWriter writer;
@Before
public void setUp() throws Exception {
this.writer = new OneByOneAsyncWriter();
}
private <T> Mono<Void> sendOperator(Publisher<String> source){
return new ChannelSendOperator<>(source, writer::send);
}
@Test
public void errorBeforeFirstItem() throws Exception {
IllegalStateException error = new IllegalStateException("boo");
Mono<Void> completion = Mono.<String>error(error).as(this::sendOperator);
Signal<Void> signal = completion.materialize().block();
assertNotNull(signal);
assertSame("Unexpected signal: " + signal, error, signal.getThrowable());
}
@Test
public void completionBeforeFirstItem() throws Exception {
Mono<Void> completion = Flux.<String>empty().as(this::sendOperator);
Signal<Void> signal = completion.materialize().block();
assertNotNull(signal);
assertTrue("Unexpected signal: " + signal, signal.isOnComplete());
assertEquals(0, this.writer.items.size());
assertTrue(this.writer.completed);
}
@Test
public void writeOneItem() throws Exception {
Mono<Void> completion = Flux.just("one").as(this::sendOperator);
Signal<Void> signal = completion.materialize().block();
assertNotNull(signal);
assertTrue("Unexpected signal: " + signal, signal.isOnComplete());
assertEquals(1, this.writer.items.size());
assertEquals("one", this.writer.items.get(0));
assertTrue(this.writer.completed);
}
@Test
public void writeMultipleItems() throws Exception {
List<String> items = Arrays.asList("one", "two", "three");
Mono<Void> completion = Flux.fromIterable(items).as(this::sendOperator);
Signal<Void> signal = completion.materialize().block();
assertNotNull(signal);
assertTrue("Unexpected signal: " + signal, signal.isOnComplete());
assertEquals(3, this.writer.items.size());
assertEquals("one", this.writer.items.get(0));
assertEquals("two", this.writer.items.get(1));
assertEquals("three", this.writer.items.get(2));
assertTrue(this.writer.completed);
}
@Test
public void errorAfterMultipleItems() throws Exception {
IllegalStateException error = new IllegalStateException("boo");
Flux<String> publisher = Flux.generate(() -> 0, (idx , subscriber) -> {
int i = ++idx;
subscriber.next(String.valueOf(i));
if (i == 3) {
subscriber.error(error);
}
return i;
});
Mono<Void> completion = publisher.as(this::sendOperator);
Signal<Void> signal = completion.materialize().block();
assertNotNull(signal);
assertSame("Unexpected signal: " + signal, error, signal.getThrowable());
assertEquals(3, this.writer.items.size());
assertEquals("1", this.writer.items.get(0));
assertEquals("2", this.writer.items.get(1));
assertEquals("3", this.writer.items.get(2));
assertSame(error, this.writer.error);
}
private static class OneByOneAsyncWriter {
private List<String> items = new ArrayList<>();
private boolean completed = false;
private Throwable error;
public Publisher<Void> send(Publisher<String> publisher) {
return subscriber -> Executors.newSingleThreadScheduledExecutor().schedule(() ->
publisher.subscribe(new WriteSubscriber(subscriber)),50, TimeUnit.MILLISECONDS);
}
private class WriteSubscriber implements Subscriber<String> {
private Subscription subscription;
private final Subscriber<? super Void> subscriber;
public WriteSubscriber(Subscriber<? super Void> subscriber) {
this.subscriber = subscriber;
}
@Override
public void onSubscribe(Subscription subscription) {
this.subscription = subscription;
this.subscription.request(1);
}
@Override
public void onNext(String item) {
items.add(item);
this.subscription.request(1);
}
@Override
public void onError(Throwable ex) {
error = ex;
this.subscriber.onError(ex);
}
@Override
public void onComplete() {
completed = true;
this.subscriber.onComplete();
}
}
}
}