怎样用C#调用R软件：R(D)COM(二)

在[url]http://cran.r-project.org/[/url]可以下载R软件，选择Other，下载R_Scilab_DCOM3.0-1B5.exe，就是R（D）COM。
在安装了R(D)COM之后，假设安装目录为“D:\Program Files\(D)COM Server\bin“。在该目录下有RServerManager.exe，在VS2005中通过Add Reference->Browse，选择RServerManager.exe。添加以后，会增加RServerManager, ConnectorCommonLib,
STATCONNECTORSEVLib三个引用。可以通过VS2005的对象察看器看三个引用中的类和函数。
每次创建一个StatConnectorClass对象时，都会启动一个服务，用于处理一个连接对象所提交的请求，这个资源不会自己停止，所以需要一个类似于连接池的服务管理器。在R(D)COM中提供了两个类ServerPool和ServerItem来完成服务管理的功能。下面的类封装了该操作。

using System;
using STATCONNECTORSRVLib;
using RServerManager;
using System.Threading;

namespace Common.Regression
{
    /** <summary>
    /// BaseRegression 回归抽象基类
    /// </summary>
    public abstract class BaseRegression : IRegression
    {
        private static ServerPool mServerPool = null;
        private ServerItem mServerItem = null;
        private IStatConnector mStatConnector = null;

        private static string mKey = "R";
        private static string mClient = "this is client";
        private static int mWaitTime = 50;
        private static int mMaxLoop = 20;
        private static int mMaxServerCount = 5;
        private static int mServerCount = 0;

        static BaseRegression()
        {
            if (mServerPool == null)
            {
                mServerPool = new ServerPool();
            }
        }

        private double[,] mData;
        public double[,] Data
        {
            get
            {
                return mData;
            }
            set
            {
                mData = value;
            }
        }

        private RegressionSummary mSummary;
        public RegressionSummary Summary
        {
            get
            {
                return mSummary;
            }
            set
            {
                mSummary = value;
            }
        }

        /** <summary>
        /// 执行回归函数
        /// </summary>
        public abstract void DoRegression();

        /** <summary>
        /// 得到执行R代码的连接
        /// </summary>
        /// <returns></returns>
        protected IStatConnector GetStatConnector()
       {
            mServerItem = mServerPool.GetServerExclusive(mKey, mClient);
            int count = 0;
            while (mServerItem == null)
            {
                if (mServerCount < mMaxServerCount)
                {
                    //当小于最小服务器数目时，增加连接
                    mStatConnector = new StatConnectorClass();
                    mStatConnector.Init(mKey);
                    mServerPool.Add(mStatConnector, mKey);
                    mServerCount++;
                    mServerItem = mServerPool.GetServerExclusive(mKey, mClient);
                    break;
                }
                if (count < mMaxLoop)
                {
                    Thread.Sleep(mWaitTime);
                    count++;
                    mServerItem = mServerPool.GetServerExclusive(mKey, mClient);
                }
                else
                {
                    return null;
                }
            }

            mStatConnector = mServerItem.Server;
            return mStatConnector;

        }

        /** <summary>
        /// 释放锁定
        /// </summary>
        public void ReleaseLock()
        {
            if (mServerItem != null)
            {
                mServerItem.ReleaseLock();
            }
        }

        public BaseRegression()
        {           
        }
    }

}

从BaseRegression继承的类将拥有可以被管理。

using System;
using System.Configuration;


namespace Common.Regression
{
     /// <summary>
     /// IRegression 回归类接口
     /// </summary>
    public interface IRegression
    {
         double[,] Data
         {
             get;
             set;
         }

         RegressionSummary Summary
         {
             get;
         }

         void DoRegression();

         void ReleaseLock();


     }

 }