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Base level improvements to Settings, DataProtection, Cipher password …
…hashing (Argon2) Some changes necessitated class assembly relocations
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| //****************************************************************************************************** | ||
| // MemoryCache.cs - Gbtc | ||
| // | ||
| // Copyright © 2024, Grid Protection Alliance. All Rights Reserved. | ||
| // | ||
| // Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See | ||
| // the NOTICE file distributed with this work for additional information regarding copyright ownership. | ||
| // The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this | ||
| // file except in compliance with the License. You may obtain a copy of the License at: | ||
| // | ||
| // http://opensource.org/licenses/MIT | ||
| // | ||
| // Unless agreed to in writing, the subject software distributed under the License is distributed on an | ||
| // "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the | ||
| // License for the specific language governing permissions and limitations. | ||
| // | ||
| // Code Modification History: | ||
| // ---------------------------------------------------------------------------------------------------- | ||
| // 03/17/2024 - Ritchie Carroll | ||
| // Generated original version of source code. | ||
| // | ||
| //****************************************************************************************************** | ||
| // ReSharper disable StaticMemberInGenericType | ||
|
|
||
| using System; | ||
| using System.Runtime.Caching; | ||
| using Gemstone.TypeExtensions; | ||
|
|
||
| namespace Gemstone.Caching; | ||
|
|
||
| /// <summary> | ||
| /// Represents a generic memory cache for a specific type <typeparamref name="T"/>. | ||
| /// </summary> | ||
| /// <typeparam name="T">Type of value to cache.</typeparam> | ||
| /// <remarks> | ||
| /// Each type T should be unique unless cache can be safely shared. | ||
| /// </remarks> | ||
| internal static class MemoryCache<T> | ||
| { | ||
| // Desired use case is one static MemoryCache per type T: | ||
| private static readonly MemoryCache s_memoryCache; | ||
|
|
||
| static MemoryCache() | ||
| { | ||
| // Reflected type name is used to ensure unique cache name for generic types | ||
| string cacheName = $"{nameof(Gemstone)}Cache:{typeof(T).GetReflectedTypeName()}"; | ||
| s_memoryCache = new MemoryCache(cacheName); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Try to get a value from the memory cache. | ||
| /// </summary> | ||
| /// <param name="cacheName">Name to use as cache key -- this should be unique per <typeparamref name="T"/>.</param> | ||
| /// <param name="value">Value from cache if already cached; otherwise, default value for <typeparamref name="T"/>.</param> | ||
| /// <returns></returns> | ||
| public static bool TryGet(string cacheName, out T? value) | ||
| { | ||
| if (s_memoryCache.Get(cacheName) is not Lazy<T> cachedValue) | ||
| { | ||
| value = default; | ||
| return false; | ||
| } | ||
|
|
||
| value = cachedValue.Value; | ||
| return true; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets or adds a value, based on result of <paramref name="valueFactory"/>, to the memory cache. Cache defaults to a 1-minute expiration. | ||
| /// </summary> | ||
| /// <param name="cacheName">Name to use as cache key -- this should be unique per <typeparamref name="T"/>.</param> | ||
| /// <param name="valueFactory">Function to generate value to add to cache -- only called if value is not already cached.</param> | ||
| /// <returns> | ||
| /// Value from cache if already cached; otherwise, new value generated by <paramref name="valueFactory"/>. | ||
| /// </returns> | ||
| public static T GetOrAdd(string cacheName, Func<T> valueFactory) | ||
| { | ||
| return GetOrAdd(cacheName, 1.0D, valueFactory); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets or adds a value, based on result of <paramref name="valueFactory"/>, to the memory cache. | ||
| /// </summary> | ||
| /// <param name="cacheName">Name to use as cache key -- this should be unique per <typeparamref name="T"/>.</param> | ||
| /// <param name="expirationTime">Expiration time, in minutes, for cached value.</param> | ||
| /// <param name="valueFactory">Function to generate value to add to cache -- only called if value is not already cached.</param> | ||
| /// <returns> | ||
| /// Value from cache if already cached; otherwise, new value generated by <paramref name="valueFactory"/>. | ||
| /// </returns> | ||
| public static T GetOrAdd(string cacheName, double expirationTime, Func<T> valueFactory) | ||
| { | ||
| Lazy<T> newValue = new(valueFactory); | ||
| Lazy<T>? oldValue; | ||
|
|
||
| try | ||
| { | ||
| // Race condition exists here such that memory cache being referenced may | ||
| // be disposed between access and method invocation - hence the try/catch | ||
| oldValue = s_memoryCache.AddOrGetExisting(cacheName, newValue, new CacheItemPolicy { SlidingExpiration = TimeSpan.FromMinutes(expirationTime) }) as Lazy<T>; | ||
| } | ||
| catch | ||
| { | ||
| oldValue = null; | ||
| } | ||
|
|
||
| try | ||
| { | ||
| return (oldValue ?? newValue).Value; | ||
| } | ||
| catch | ||
| { | ||
| s_memoryCache.Remove(cacheName); | ||
| throw; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Removes a value from the memory cache. | ||
| /// </summary> | ||
| /// <param name="cacheName">Specific named memory cache instance to remove from cache.</param> | ||
| public static void Remove(string cacheName) | ||
| { | ||
| s_memoryCache.Remove(cacheName); | ||
| } | ||
| } |
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