﻿using System;
using System.Threading;

namespace Lucene.Net.Support
{
    /*
	 * 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.
	 */

#if FEATURE_SERIALIZABLE
    [Serializable]
#endif
    public class AtomicObject<T> where T : class
    {
        private T _value;
        private ReaderWriterLockSlim _lock = new ReaderWriterLockSlim();

        public AtomicObject() : this(default(T))
        { }

        public AtomicObject(T initial)
        {
            _value = initial;
        }

        public T Value
        {
            get
            {
                try
                {
                    _lock.EnterReadLock();
                    return _value;
                }
                finally
                {
                    _lock.ExitReadLock();
                }
            }
            set
            {
                Interlocked.Exchange(ref _value, value);
            }
        }
    }
}
