Hishop.TransferManager/TransferContainer.cs

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namespace Hishop.TransferManager
{
    using System;
    using System.Data;
    using System.IO;
    using System.Reflection;
    using System.Runtime.CompilerServices;
    using System.Web;
    using System.Web.Caching;

    internal class TransferContainer
    {
        private static volatile TransferContainer _instance = null;
        private const string CacheKey = "Hishop_TransferIndexes";
        private static readonly object LockHelper = new object();
        private static volatile Cache TransferCache = HttpRuntime.Cache;

        private TransferContainer()
        {
            TransferCache.Remove("Hishop_TransferIndexes");
        }

        private static void AddToExportIndex(Type t, string filename, DataTable dtExporters)
        {
            ExportAdapter adapter = Activator.CreateInstance(t) as ExportAdapter;
            DataRow row = dtExporters.NewRow();
            row["fullName"] = t.FullName.ToLower();
            row["filePath"] = filename;
            row["sourceName"] = adapter.Source.Name;
            row["sourceVersion"] = adapter.Source.Version.ToString();
            row["exportToName"] = adapter.ExportTo.Name;
            row["exportToVersion"] = adapter.ExportTo.Version.ToString();
            dtExporters.Rows.Add(row);
        }

        private static void AddToImportIndex(Type t, string filename, DataTable dtImporters)
        {
            ImportAdapter adapter = Activator.CreateInstance(t) as ImportAdapter;
            DataRow row = dtImporters.NewRow();
            row["fullName"] = t.FullName.ToLower();
            row["filePath"] = filename;
            row["sourceName"] = adapter.Source.Name;
            row["sourceVersion"] = adapter.Source.Version.ToString();
            row["importToName"] = adapter.ImportTo.Name;
            row["importToVersion"] = adapter.ImportTo.Version.ToString();
            dtImporters.Rows.Add(row);
        }

        private static void BuildIndex(string pluginPath, DataTable dtExporters, DataTable dtImporters)
        {
            if (Directory.Exists(pluginPath))
            {
                foreach (string str in Directory.GetFiles(pluginPath, "*.dll", SearchOption.AllDirectories))
                {
                    foreach (Type type in Assembly.Load(LoadPluginFile(str)).GetExportedTypes())
                    {
                        if (type.BaseType != null)
                        {
                            if (type.BaseType.Name == "ExportAdapter")
                            {