/NRefactory/ICSharpCode.NRefactory/Utils/CacheManager.cs

 1// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
 2// 
 3// Permission is hereby granted, free of charge, to any person obtaining a copy of this
 4// software and associated documentation files (the "Software"), to deal in the Software
 5// without restriction, including without limitation the rights to use, copy, modify, merge,
 6// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
 7// to whom the Software is furnished to do so, subject to the following conditions:
 8// 
 9// The above copyright notice and this permission notice shall be included in all copies or
10// substantial portions of the Software.
11// 
12// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
13// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
15// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
16// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
17// DEALINGS IN THE SOFTWARE.
18
19using System;
20using System.Collections.Concurrent;
21using System.Collections.Generic;
22using System.Threading;
23
24namespace ICSharpCode.NRefactory.Utils
25{
26	/// <summary>
27	/// Allows caching values for a specific compilation.
28	/// A CacheManager consists of a for shared instances (shared among all threads working with that resolve context).
29	/// </summary>
30	/// <remarks>This class is thread-safe</remarks>
31	public sealed class CacheManager
32	{
33		readonly ConcurrentDictionary<object, object> sharedDict = new ConcurrentDictionary<object, object>(ReferenceComparer.Instance);
34		// There used to be a thread-local dictionary here, but I removed it as it was causing memory
35		// leaks in some use cases.
36		
37		public object GetShared(object key)
38		{
39			object value;
40			sharedDict.TryGetValue(key, out value);
41			return value;
42		}
43		
44		public object GetOrAddShared(object key, Func<object, object> valueFactory)
45		{
46			return sharedDict.GetOrAdd(key, valueFactory);
47		}
48		
49		public object GetOrAddShared(object key, object value)
50		{
51			return sharedDict.GetOrAdd(key, value);
52		}
53		
54		public void SetShared(object key, object value)
55		{
56			sharedDict[key] = value;
57		}
58	}
59}