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ObjectCache.cs
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ObjectCache.cs
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// <copyright file="ObjectCache.cs" company="Brian Rogers">
// Copyright (c) Brian Rogers. All rights reserved.
// </copyright>
namespace DhcpServer
{
using System.Collections.Concurrent;
/// <summary>
/// Holds a cache of keyed objects.
/// </summary>
/// <typeparam name="TKey">The type for the object key.</typeparam>
/// <typeparam name="TValue">The type for the object value.</typeparam>
public abstract class ObjectCache<TKey, TValue>
{
private readonly ConcurrentDictionary<TKey, TValue> cache;
/// <summary>
/// Initializes a new instance of the <see cref="ObjectCache{TInput, TOutput}"/> class.
/// </summary>
protected ObjectCache()
{
this.cache = new ConcurrentDictionary<TKey, TValue>();
}
/// <summary>
/// Gets a cached object instance.
/// </summary>
/// <remarks>If the value is not yet cached, this method will create a new instance,
/// cache it, and return it.</remarks>
/// <param name="key">The object key.</param>
/// <returns>The object value.</returns>
public TValue this[TKey key] => this.cache.GetOrAdd(key, (k, t) => t.Create(k), this);
/// <summary>
/// Creates a new object instance from the specified key.
/// </summary>
/// <param name="key">The object key.</param>
/// <returns>The newly created object value.</returns>
protected abstract TValue Create(TKey key);
}
}