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SynchronizedDictionary.cs
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SynchronizedDictionary.cs
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//
// SynchronizedDictionary.cs
//
// Author:
// Chris Howie <me@chrishowie.com>
//
// Copyright (c) 2010 Chris Howie
//
// 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;
using System.Threading;
using Cdh.Toolkit.Extensions.ReaderWriterLockSlim;
namespace Cdh.Toolkit.Collections
{
public class SynchronizedDictionary<TKey, TValue> :
SynchronizedCollection<KeyValuePair<TKey, TValue>>, IDictionary<TKey, TValue>
{
protected new IDictionary<TKey, TValue> Decorated { get; private set; }
public SynchronizedDictionary(IDictionary<TKey, TValue> dictionary,
EnumerateBehavior behavior, ReaderWriterLockSlim @lock)
: base(dictionary, behavior, @lock)
{
Decorated = dictionary;
Initialize();
}
public SynchronizedDictionary(IDictionary<TKey, TValue> dictionary,
EnumerateBehavior behavior)
: base(dictionary, behavior)
{
Decorated = dictionary;
Initialize();
}
public SynchronizedDictionary(EnumerateBehavior behavior, ReaderWriterLockSlim @lock)
: base(new Dictionary<TKey, TValue>(), behavior, @lock)
{
Decorated = (IDictionary<TKey, TValue>)base.Decorated;
Initialize();
}
public SynchronizedDictionary(EnumerateBehavior behavior)
: base(new Dictionary<TKey, TValue>(), behavior)
{
Decorated = (IDictionary<TKey, TValue>)base.Decorated;
Initialize();
}
protected sealed override void ValidateItem(KeyValuePair<TKey, TValue> item)
{
ValidateKey(item.Key);
ValidateValue(item.Value);
}
protected virtual void ValidateKey(TKey key) { }
protected virtual void ValidateValue(TValue value) { }
private void Initialize()
{
// The base collections are already read-only, but wrapping the
// SynchronizedCollection in a ReadOnlyCollection prevents a write
// lock from being acquired prior to throwing the inevitable
// exception.
Keys = CreateSynchronizedReadOnlyCollection(Decorated.Keys);
Values = CreateSynchronizedReadOnlyCollection(Decorated.Values);
}
private ICollection<T> CreateSynchronizedReadOnlyCollection<T>(ICollection<T> collection)
{
return new ReadOnlyCollection<T>(
new SynchronizedCollection<T>(
collection, EnumerateBehavior, Lock));
}
#region IDictionary<TKey,TValue> Members
public virtual void Add(TKey key, TValue value)
{
ValidateKey(key);
ValidateValue(value);
using (Lock.Write())
Decorated.Add(key, value);
}
public virtual bool ContainsKey(TKey key)
{
using (Lock.Read())
return Decorated.ContainsKey(key);
}
public virtual ICollection<TKey> Keys { get; private set; }
public virtual bool Remove(TKey key)
{
using (Lock.Write())
return Decorated.Remove(key);
}
public virtual bool TryGetValue(TKey key, out TValue value)
{
using (Lock.Read())
return Decorated.TryGetValue(key, out value);
}
public virtual ICollection<TValue> Values { get; private set; }
public virtual TValue this[TKey key]
{
get
{
using (Lock.Read())
return Decorated[key];
}
set
{
ValidateKey(key);
ValidateValue(value);
using (Lock.Write())
Decorated[key] = value;
}
}
#endregion
}
}