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Core functionality for the RSocket library

There is a newer version: 1.1.4

/*
 * Copyright 2015-2019 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 io.rsocket.resume;

import io.netty.buffer.ByteBuf;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Consumer;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.Disposable;
import reactor.core.publisher.Flux;

class ResumeFramesSubscriber implements Subscriber, Disposable {
  private final Flux requests;
  private final Consumer onNext;
  private final Consumer onError;
  private final Runnable onComplete;
  private final AtomicBoolean disposed = new AtomicBoolean();
  private volatile Disposable requestsDisposable;
  private volatile Subscription subscription;

  public ResumeFramesSubscriber(
      Flux requests,
      Consumer onNext,
      Consumer onError,
      Runnable onComplete) {
    this.requests = requests;
    this.onNext = onNext;
    this.onError = onError;
    this.onComplete = onComplete;
  }

  @Override
  public void onSubscribe(Subscription s) {
    if (isDisposed()) {
      s.cancel();
    } else {
      this.subscription = s;
      this.requestsDisposable = requests.subscribe(s::request);
    }
  }

  @Override
  public void onNext(ByteBuf frame) {
    this.onNext.accept(frame);
  }

  @Override
  public void onError(Throwable t) {
    this.onError.accept(t);
    requestsDisposable.dispose();
  }

  @Override
  public void onComplete() {
    this.onComplete.run();
    requestsDisposable.dispose();
  }

  @Override
  public void dispose() {
    if (disposed.compareAndSet(false, true)) {
      if (subscription != null) {
        subscription.cancel();
        requestsDisposable.dispose();
      }
    }
  }

  @Override
  public boolean isDisposed() {
    return disposed.get();
  }
}