45 lines
1.8 KiB
C#
45 lines
1.8 KiB
C#
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namespace Unosquare.Swan.Components
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{
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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/// <summary>
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/// A thread-safe collection cache repository for types.
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/// </summary>
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/// <typeparam name="TValue">The type of member to cache.</typeparam>
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public class CollectionCacheRepository<TValue>
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{
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private readonly Lazy<ConcurrentDictionary<Type, IEnumerable<TValue>>> _data =
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new Lazy<ConcurrentDictionary<Type, IEnumerable<TValue>>>(() =>
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new ConcurrentDictionary<Type, IEnumerable<TValue>>(), true);
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/// <summary>
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/// Determines whether the cache contains the specified key.
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/// </summary>
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/// <param name="key">The key.</param>
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/// <returns><c>true</c> if the cache contains the key, otherwise <c>false</c>.</returns>
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public bool ContainsKey(Type key) => _data.Value.ContainsKey(key);
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/// <summary>
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/// Retrieves the properties stored for the specified type.
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/// If the properties are not available, it calls the factory method to retrieve them
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/// and returns them as an array of PropertyInfo.
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/// </summary>
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/// <param name="key">The key.</param>
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/// <param name="factory">The factory.</param>
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/// <returns>
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/// An array of the properties stored for the specified type.
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/// </returns>
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/// <exception cref="System.ArgumentNullException">type.</exception>
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public IEnumerable<TValue> Retrieve(Type key, Func<Type, IEnumerable<TValue>> factory)
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{
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if (factory == null)
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throw new ArgumentNullException(nameof(factory));
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return _data.Value.GetOrAdd(key, k => factory.Invoke(k).Where(item => item != null));
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}
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}
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}
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