My Task Catalog

gistfile1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.IO;
using System.Linq;
using System.Text;
using OC.SchedulerInterface;
using System.ComponentModel.Composition.Primitives;

namespace OC.Scheduler.Core
{
    public class TaskCatalog 
    {
        [ImportMany]
        List<ISchedulerTask> m_tasks;

        readonly CompositionContainer m_container;
        readonly FileSystemWatcher m_fileSystemWatcher;

        public List<ISchedulerTask> AvailableTasks
        {
            get { return m_tasks; }
        }

        public TaskCatalog()
        {
            var catalog = new AggregateCatalog();

            var folders = Directory.GetDirectories(ConfigSettings.Instance.TaskBinLocation, "*", SearchOption.AllDirectories);

            foreach (string folder in folders)
            {
                var directoryCatalog = new DirectoryCatalog(folder);
                catalog.Catalogs.Add(directoryCatalog);
            }

            catalog.Catalogs.Add(new DirectoryCatalog(ConfigSettings.Instance.TaskBinLocation));

            m_fileSystemWatcher = new FileSystemWatcher(ConfigSettings.Instance.TaskBinLocation);
            m_fileSystemWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.Size;

            m_fileSystemWatcher.Changed += OnDllAdded;
            m_fileSystemWatcher.Created += OnDllAdded;
            m_fileSystemWatcher.EnableRaisingEvents = true;
            m_container = new CompositionContainer(catalog);
            m_container.ComposeParts(this);
        }

        private void OnDllAdded(object sender, FileSystemEventArgs e)
        {
            var catalog = (AggregateCatalog)m_container.Catalog;
            var folders = Directory.GetDirectories(ConfigSettings.Instance.TaskBinLocation, "*", SearchOption.AllDirectories);
            foreach (string folder in folders)
            {
                if (catalog.Catalogs.Count(fol => ((DirectoryCatalog)fol).Path == folder) > 0)
                    continue;

                var directoryCatalog = new DirectoryCatalog(folder);
                catalog.Catalogs.Add(directoryCatalog);
            }
            Refresh();
        }

        public void Refresh()
        {
            m_container.ComposeParts(this);
        }
    }
}