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/*

* THIS PEACE OF CODE WAS TAKEN FROM

* Json.Net (http://json.codeplex.com)

* PUBLISHED UNDER THE FOLLOWING LICENSE:

*

* The MIT License (MIT)

*

* Copyright (c) 2007 James Newton-King

*

* 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.Generic;

namespace GeoAPI.Utilities

{

public class ThreadSafeStore<TKey, TValue>

{

private readonly object _lock = new object();

private Dictionary<TKey, TValue> _store;

private readonly Func<TKey, TValue> _creator;

public ThreadSafeStore(Func<TKey, TValue> creator)

{

if (creator == null)

throw new ArgumentNullException("creator");

_creator = creator;

}

public TValue Get(TKey key)

{

if (_store == null)

return AddValue(key);

TValue value;

if (!_store.TryGetValue(key, out value))

return AddValue(key);

return value;

}

private TValue AddValue(TKey key)

{

TValue value = _creator(key);

lock (_lock)

{

if (_store == null)

{

_store = new Dictionary<TKey, TValue>();

_store[key] = value;

}

else

{

// double check locking

TValue checkValue;

if (_store.TryGetValue(key, out checkValue))

return checkValue;

Dictionary<TKey, TValue> newStore = new Dictionary<TKey, TValue>(_store);

newStore[key] = value;

_store = newStore;

}

return value;

}

}

}

}