squidex/src/Squidex.Infrastructure/Singletons.cs

// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschränkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using System;
using System.Collections.Concurrent;

namespace Squidex.Infrastructure
{
    public static class Singletons<T>
    {
        private static readonly ConcurrentDictionary<string, T> Instances = new ConcurrentDictionary<string, T>(StringComparer.OrdinalIgnoreCase);

        public static T GetOrAdd(string key, Func<string, T> factory)
        {
            return Instances.GetOrAdd(key, factory);
        }

        public static Lazy<T> GetOrAddLazy(string key, Func<string, T> factory)
        {
            return new Lazy<T>(() => Instances.GetOrAdd(key, factory));
        }
    }
}