Source/MessageHandler.cs

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using System;
using System.Windows.Forms;
using System.Collections;
using System.Threading;

namespace DevComponents.DotNetBar
{
	/// <summary>
	/// Summary description for MessageHandler.
	/// </summary>
	internal class MessageHandler
	{
		private static ArrayList m_Clients=new ArrayList();
		//private static bool m_FilterInstalled=false;
		//private static MessageFilterWrapper m_MessageFilter=null;
		private static Hashtable m_FilterOnThread=new Hashtable();

        private static ReaderWriterLock rwClientsListLock;

        // Methods
        static MessageHandler()
        {
            MessageHandler.rwClientsListLock = new ReaderWriterLock();
        }

		public static void RegisterMessageClient(IMessageHandlerClient client)
		{
			if(m_Clients.Contains(client))
				return;

			if(!m_FilterOnThread.ContainsKey(System.Threading.Thread.CurrentThread.GetHashCode()))
				InstallMessageFilter();

            LockCookie cookie1 = new LockCookie();
            bool readerLockHeld = MessageHandler.rwClientsListLock.IsReaderLockHeld;

            if (readerLockHeld)
            {
                cookie1 = MessageHandler.rwClientsListLock.UpgradeToWriterLock(-1);
            }
            else
            {
                MessageHandler.rwClientsListLock.AcquireWriterLock(-1);
            }

            try
            {
                m_Clients.Add(client);
            }
            finally
            {
                if (readerLockHeld)
                {
                    MessageHandler.rwClientsListLock.DowngradeFromWriterLock(ref cookie1);
                }
                else
                {
                    MessageHandler.rwClientsListLock.ReleaseWriterLock();
                }
            }