// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team

//

// Permission is hereby granted, free of charge, to any person obtaining a copy of this

// software and associated documentation files (the "Software"), to deal in the Software

// without restriction, including without limitation the rights to use, copy, modify, merge,

// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons

// to whom the Software is furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all copies or

// substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,

// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR

// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE

// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

// DEALINGS IN THE SOFTWARE.

using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Threading;

namespace ICSharpCode.NRefactory.Utils

{

/// <summary>

/// Allows caching values for a specific compilation.

/// A CacheManager consists of a for shared instances (shared among all threads working with that resolve context).

/// </summary>

/// <remarks>This class is thread-safe</remarks>

public sealed class CacheManager

{

readonly ConcurrentDictionary<object, object> sharedDict = new ConcurrentDictionary<object, object>(ReferenceComparer.Instance);

// There used to be a thread-local dictionary here, but I removed it as it was causing memory

// leaks in some use cases.

public object GetShared(object key)

{

object value;

sharedDict.TryGetValue(key, out value);

return value;

}

public object GetOrAddShared(object key, Func<object, object> valueFactory)

{

return sharedDict.GetOrAdd(key, valueFactory);

}

public object GetOrAddShared(object key, object value)

{

return sharedDict.GetOrAdd(key, value);

}

public void SetShared(object key, object value)

{

sharedDict[key] = value;

}

}

}