content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  // Includes work from:
  /*
   * Copyright 2018 LINE Corporation
   *
   * LINE Corporation licenses this file to you 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:
   *
   *   https://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.opentelemetry.instrumentation.rxjava.v3_0;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.internal.fuseable.QueueDisposable;
  import io.reactivex.rxjava3.internal.observers.BasicFuseableObserver;
  
  class TracingObserver<T> extends BasicFuseableObserver<T, T> {
  
    private final Context context;
  
    TracingObserver(Observer<? super T> downstream, Context context) {
      super(downstream);
      this.context = context;
    }
  
    @Override
    public void onNext(T t) {
      try (Scope ignored = context.makeCurrent()) {
        downstream.onNext(t);
      }
    }
  
    @Override
    public void onError(Throwable t) {
      try (Scope ignored = context.makeCurrent()) {
        downstream.onError(t);
      }
    }
  
    @Override
    public void onComplete() {
      try (Scope ignored = context.makeCurrent()) {
        downstream.onComplete();
      }
    }
  
    @Override
    public int requestFusion(int mode) {
      QueueDisposable<T> qd = this.qd;
      if (qd != null) {
        int m = qd.requestFusion(mode);
        sourceMode = m;
        return m;
      }
      return NONE;
    }
  
    @Override
    public T poll() throws Throwable {
      return qd.poll();
    }
  }
  