WSHCommon/Common/CommonLang/State.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CommonLang
{
    public class State<T>
    {
        private T mValue;

        public T Value { get { return mValue; } }

        public State(T value)
        {
            this.mValue = value;
        }

        public bool ChangeState(T value)
        {
            if (!mValue.Equals(value))
            {
                mValue = value;
                return true;
            }
            return false;
        }
        public bool CompareChangeState(T expect, T new_value)
        {
            if (expect.Equals(mValue))
            {
                mValue = new_value;
                return true;
            }
            return false;
        }
    }

    public class AtomicState<T>
    {
        private T mValue;

        public T Value { get { lock (this) { return mValue; } } }

        public AtomicState(T value)
        {
            this.mValue = value;
        }

        public bool ChangeState(T value)
        {
            lock (this)
            {
                if (!mValue.Equals(value))
                {
                    mValue = value;
                    return true;
                }
                return false;
            }
        }
        public bool CompareChangeState(T expect, T new_value)
        {
            lock (this)
            {
                if (expect.Equals(mValue))
                {
                    mValue = new_value;
                    return true;
                }
                return false;
            }
        }
    }
}