LockableNotifier.cs

using GitUIPluginInterfaces;
using System;
using System.Text;

namespace GitCommands
{
    public abstract class LockableNotifier : ILockableNotifier
    {
        private int lockCount = 0;
        private bool notifyRequested = false;

        protected abstract void InternalNotify();

        private void CheckNotify()
        {
            if (!IsLocked && notifyRequested)
            {
                notifyRequested = false;
                InternalNotify();
            }        
        }
        /// <summary>
        /// notifies if is unlocked
        /// </summary>
        public void Notify()
        {
            notifyRequested = true;
            CheckNotify();
        }

        /// <summary>
        /// locks raising notification
        /// </summary>
        public void Lock()
        {
            lockCount++;
        }

        /// <summary>
        /// unlocks raising notification
        /// to unlock raising notification, UnLock has to be called as many times as Lock was called
        /// </summary>
        /// <param name="requestNotify">true if Notify has to be called</param>
        public void UnLock(bool requestNotify)
        {
            if (lockCount > 0)
                lockCount--;
            else
                throw new InvalidOperationException("There was no counterpart call to Lock");

            if (requestNotify)
                Notify();
            else
                CheckNotify();
        }

        /// <summary>
        /// true if raising notification is locked
        /// </summary>
        public bool IsLocked { get { return lockCount != 0; } }

    }

    public class ActionNotifier : LockableNotifier
    {
        private Action NotifyAction;

        public ActionNotifier(Action aNotifyAction)
        {
            if (aNotifyAction == null)
                throw new ArgumentNullException("aNotifyAction");
            NotifyAction = aNotifyAction;
        }

        protected override void InternalNotify()
        {
            NotifyAction();
        }
    }
}