using System;
using System.Threading;

namespace Update.Utils
{
    public static class MutexExtensions
    {
        public delegate void DeleWriteLog(string txt);
        public static DeleWriteLog WriteLog;

        /// <summary>
        /// 进程间互斥操作
        /// </summary>
        /// <param name="key"></param>
        /// <param name="action"></param>
        /// <param name="recursive"></param>
        private static void Exec(string key, Action action, bool recursive)
        {
            using (Mutex mutex = new Mutex(initiallyOwned: false, name: key))
            {
                try
                {
                    mutex.WaitOne();
                    action();
                }
                catch (AbandonedMutexException ex)
                {
                    if (recursive)
                    {
                        WriteLog?.Invoke(ex.Message);
                    }
                    else
                    {
                        Exec(key, action, true);
                    }
                }
                finally
                {
                    mutex.ReleaseMutex();
                }
            }
        }

        /// <summary>
        /// 进程间互斥操作
        /// </summary>
        /// <param name="key"></param>
        /// <param name="action"></param>
        public static void Exec(string key, Action action)
        {
            Exec(key, action, false);
        }
    }
}