/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *   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.
 */

using Org.Apache.Reef.Utilities.Logging;
using System;

namespace Org.Apache.Reef.Wake.RX
{
    /// <summary>
    /// An observer with logging-only onError and onCompleted() methods.
    /// </summary>
    /// <typeparam name="T">The observer type</typeparam>
    public abstract class AbstractObserver<T> : IObserver<T>
    {
        private static readonly Logger LOGGER = Logger.GetLogger(typeof(AbstractObserver<T>));

        public virtual void OnError(Exception error)
        {
            LOGGER.Log(Level.Info, "The observer " + GetType() + "has received an Exception: " + error);
        }

        public virtual void OnCompleted()
        {
            LOGGER.Log(Level.Verbose, "The observer " + GetType() + "has received an onCompleted() ");
        }

        public abstract void OnNext(T arg1);
    }
}
