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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System.Collections;
using System.Collections.Generic;
namespace Microsoft.Scripting.Utils {
/// <summary>
/// Dictionary[TKey, TValue] is not thread-safe in the face of concurrent reads and writes. SynchronizedDictionary
/// provides a thread-safe implementation. It holds onto a Dictionary[TKey, TValue] instead of inheriting from
/// it so that users who need to do manual synchronization can access the underlying Dictionary[TKey, TValue].
/// </summary>
public class SynchronizedDictionary<TKey, TValue> :
IDictionary<TKey, TValue>,
ICollection<KeyValuePair<TKey, TValue>>,
IEnumerable<KeyValuePair<TKey, TValue>> {
Dictionary<TKey, TValue> _dictionary;
/// <summary>
/// This returns the raw unsynchronized Dictionary[TKey, TValue]. Users are responsible for locking
/// on it before accessing it. Also, it should not be arbitrarily handed out to other code since deadlocks
/// can be caused if other code incorrectly locks on it.
/// </summary>
public Dictionary<TKey, TValue> UnderlyingDictionary {
get { return _dictionary; }
}
public SynchronizedDictionary()
: this(new Dictionary<TKey, TValue>()) {
}
public SynchronizedDictionary(Dictionary<TKey, TValue> dictionary) {
_dictionary = dictionary;
}
#region IDictionary<TKey,TValue> Members
public void Add(TKey key, TValue value) {
lock (_dictionary) {
_dictionary.Add(key, value);
}
}
public bool ContainsKey(TKey key) {
lock (_dictionary) {
return _dictionary.ContainsKey(key);
}
}
public ICollection<TKey> Keys {
get {
lock (_dictionary) {
return _dictionary.Keys;
}
}
}
public bool Remove(TKey key) {
lock (_dictionary) {
return _dictionary.Remove(key);
}
}
public bool TryGetValue(TKey key, out TValue value) {
lock (_dictionary) {
return _dictionary.TryGetValue(key, out value);
}
}
public ICollection<TValue> Values {
get {
lock (_dictionary) {
return _dictionary.Values;
}
}
}
public TValue this[TKey key] {
get {
lock (_dictionary) {
return _dictionary[key];
}
}
set {
lock (_dictionary) {
_dictionary[key] = value;
}
}
}
#endregion
#region ICollection<KeyValuePair<TKey,TValue>> Members
private ICollection<KeyValuePair<TKey, TValue>> AsICollection() {
return ((ICollection<KeyValuePair<TKey, TValue>>)_dictionary);
}
public void Add(KeyValuePair<TKey, TValue> item) {
lock (_dictionary) {
AsICollection().Add(item);
}
}
public void Clear() {
lock (_dictionary) {
AsICollection().Clear();
}
}
public bool Contains(KeyValuePair<TKey, TValue> item) {
lock (_dictionary) {
return AsICollection().Contains(item);
}
}
public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) {
lock (_dictionary) {
AsICollection().CopyTo(array, arrayIndex);
}
}
public int Count {
get {
lock (_dictionary) {
return AsICollection().Count;
}
}
}
public bool IsReadOnly {
get {
lock (_dictionary) {
return AsICollection().IsReadOnly;
}
}
}
public bool Remove(KeyValuePair<TKey, TValue> item) {
lock (_dictionary) {
return AsICollection().Remove(item);
}
}
#endregion
#region IEnumerable<KeyValuePair<TKey,TValue>> Members
public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() {
lock (_dictionary) {
return _dictionary.GetEnumerator();
}
}
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator() {
lock (_dictionary) {
return _dictionary.GetEnumerator();
}
}
#endregion
}
}
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