45 lines
1.2 KiB
C#
45 lines
1.2 KiB
C#
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using System;
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using System.Threading;
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namespace Umbraco.Core.Resolving
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{
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/// <summary>
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/// base class for resolvers which declare a singleton accessor
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/// </summary>
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/// <typeparam name="TResolver"></typeparam>
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internal abstract class ResolverBase<TResolver>
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where TResolver : class
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{
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static TResolver _resolver;
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//TODO: This is not correct, this will be the same lock for all ResolverBase classes!!
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// this will work i suppose but not really ideal
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static readonly ReaderWriterLockSlim ResolversLock = new ReaderWriterLockSlim();
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public static TResolver Current
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{
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get
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{
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using (new ReadLock(ResolversLock))
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{
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if (_resolver == null)
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throw new InvalidOperationException("Current has not been initialized. You must initialize Current before trying to read it.");
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return _resolver;
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}
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}
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set
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{
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using (new WriteLock(ResolversLock))
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{
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if (value == null)
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throw new ArgumentNullException("value");
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if (_resolver != null)
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throw new InvalidOperationException("Current has already been initialized. It is not possible to re-initialize Current once it has been initialized.");
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_resolver = value;
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}
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}
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}
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}
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}
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