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There is a newer version: 2.0.0-rc-1

/*
 * Copyright 2014 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 ratpack.stream.internal;

import com.google.common.collect.Lists;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import ratpack.exec.Result;

import java.util.Collections;
import java.util.List;
import java.util.function.Consumer;

public class CollectingSubscriber implements Subscriber {

  public final List received = Lists.newLinkedList();
  public Subscription subscription;
  public Throwable error;
  public boolean complete;
  public final Consumer>> consumer;
  private final Consumer subscriptionConsumer;

  public CollectingSubscriber() {
    this(r -> {
    }, s -> {
    });
  }

  public CollectingSubscriber(Consumer>> resultConsumer, Consumer subscriptionConsumer) {
    this.consumer = resultConsumer;
    this.subscriptionConsumer = subscriptionConsumer;
  }

  public static  CollectingSubscriber subscribe(Publisher publisher) {
    CollectingSubscriber subscriber = new CollectingSubscriber<>();
    publisher.subscribe(subscriber);
    return subscriber;
  }

  @Override
  public void onSubscribe(Subscription s) {
    subscription = s;
    subscriptionConsumer.accept(s);
  }

  @Override
  public void onNext(T t) {
    received.add(t);
  }

  @Override
  public void onError(Throwable t) {
    error = t;
    consumer.accept(Result.>error(t));
  }

  @Override
  public void onComplete() {
    complete = true;
    consumer.accept(Result.success(Collections.unmodifiableList(received)));
  }

}