Warhound/WarhoundConsole/Singleton.cs

namespace WarhoundConsole
{
    public sealed class Singleton
    {
        public sealed class InitializeParams
        {
            // FILL SOMETHING
        }

        public static Singleton I => i ??= new();
        private static Singleton? i = null;

        private bool isInitialized;

        public bool ExitRequested { get; private set; }

        private Singleton()
        {
            this.isInitialized = false;
            this.ExitRequested = false;
        }

        public bool Initialize(InitializeParams initializeParams)
        {
            try
            {
                if (this.isInitialized)
                {
                    throw new InvalidOperationException("이미 초기화된 싱글톤");
                }

                if (initializeParams == null)
                {
                    throw new ArgumentNullException(nameof(initializeParams));
                }

                this.InitializeInternal(initializeParams);
            }
            finally
            {
                this.isInitialized = true;
            }

            return true;
        }

        private void InitializeInternal(InitializeParams initializeParams)
        {
            // DO SOMETHING
        }

        public void Exit()
        {
            this.ExitRequested = true;
        }
    }
}