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Added "Properties" property on Logger for reading and editing propert…
…ies. (#3430) * Logger - Properties added using WithProperty can now be inspected safely * small code improvement
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// | ||
// Copyright (c) 2004-2019 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen | ||
// | ||
// All rights reserved. | ||
// | ||
// Redistribution and use in source and binary forms, with or without | ||
// modification, are permitted provided that the following conditions | ||
// are met: | ||
// | ||
// * Redistributions of source code must retain the above copyright notice, | ||
// this list of conditions and the following disclaimer. | ||
// | ||
// * Redistributions in binary form must reproduce the above copyright notice, | ||
// this list of conditions and the following disclaimer in the documentation | ||
// and/or other materials provided with the distribution. | ||
// | ||
// * Neither the name of Jaroslaw Kowalski nor the names of its | ||
// contributors may be used to endorse or promote products derived from this | ||
// software without specific prior written permission. | ||
// | ||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | ||
// THE POSSIBILITY OF SUCH DAMAGE. | ||
// | ||
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namespace NLog.Internal | ||
{ | ||
using System; | ||
using System.Collections; | ||
using System.Collections.Generic; | ||
using System.Linq; | ||
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internal class ThreadSafeDictionary<TKey, TValue> : IDictionary<TKey, TValue> | ||
{ | ||
private readonly object _lockObject = new object(); | ||
private readonly IEqualityComparer<TKey> _comparer; | ||
private Dictionary<TKey, TValue> _dict; | ||
private Dictionary<TKey, TValue> _dictReadOnly; // Reset cache on change | ||
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public ThreadSafeDictionary() | ||
:this(EqualityComparer<TKey>.Default) | ||
{ | ||
} | ||
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public ThreadSafeDictionary(IEqualityComparer<TKey> comparer) | ||
{ | ||
_comparer = comparer; | ||
_dict = new Dictionary<TKey, TValue>(_comparer); | ||
} | ||
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public ThreadSafeDictionary(ThreadSafeDictionary<TKey, TValue> source) | ||
{ | ||
_comparer = source._comparer; | ||
_dict = source.GetReadOnlyDict(); | ||
GetWritableDict(); // Clone | ||
} | ||
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public TValue this[TKey key] | ||
{ | ||
get => GetReadOnlyDict()[key]; | ||
set | ||
{ | ||
lock (_lockObject) | ||
{ | ||
GetWritableDict()[key] = value; | ||
} | ||
} | ||
} | ||
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public ICollection<TKey> Keys => GetReadOnlyDict().Keys; | ||
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public ICollection<TValue> Values => GetReadOnlyDict().Values; | ||
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public int Count => GetReadOnlyDict().Count; | ||
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public bool IsReadOnly => false; | ||
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public void Add(TKey key, TValue value) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
GetWritableDict().Add(key, value); | ||
} | ||
} | ||
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public void Add(KeyValuePair<TKey, TValue> item) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
GetWritableDict().Add(item.Key, item.Value); | ||
} | ||
} | ||
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public void Clear() | ||
{ | ||
lock (_lockObject) | ||
{ | ||
GetWritableDict(true); | ||
} | ||
} | ||
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public bool Contains(KeyValuePair<TKey, TValue> item) | ||
{ | ||
return GetReadOnlyDict().Contains(item); | ||
} | ||
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public bool ContainsKey(TKey key) | ||
{ | ||
return GetReadOnlyDict().ContainsKey(key); | ||
} | ||
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public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) | ||
{ | ||
((IDictionary<TKey,TValue>)GetReadOnlyDict()).CopyTo(array, arrayIndex); | ||
} | ||
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public void CopyFrom(IDictionary<TKey, TValue> source) | ||
{ | ||
if (!ReferenceEquals(this, source) && source?.Count > 0) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
var destDict = GetWritableDict(); | ||
foreach (var item in source) | ||
destDict[item.Key] = item.Value; | ||
} | ||
} | ||
} | ||
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public bool Remove(TKey key) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
return GetWritableDict().Remove(key); | ||
} | ||
} | ||
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public bool Remove(KeyValuePair<TKey, TValue> item) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
return GetWritableDict().Remove(item); | ||
} | ||
} | ||
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public bool TryGetValue(TKey key, out TValue value) | ||
{ | ||
return GetReadOnlyDict().TryGetValue(key, out value); | ||
} | ||
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IEnumerator<KeyValuePair<TKey, TValue>> IEnumerable<KeyValuePair<TKey, TValue>>.GetEnumerator() | ||
{ | ||
return GetReadOnlyDict().GetEnumerator(); | ||
} | ||
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IEnumerator IEnumerable.GetEnumerator() | ||
{ | ||
return GetReadOnlyDict().GetEnumerator(); | ||
} | ||
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public Enumerator GetEnumerator() | ||
{ | ||
return new Enumerator(GetReadOnlyDict().GetEnumerator()); | ||
} | ||
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public struct Enumerator : IEnumerator<KeyValuePair<TKey, TValue>> | ||
{ | ||
Dictionary<TKey, TValue>.Enumerator _enumerator; | ||
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public Enumerator(Dictionary<TKey, TValue>.Enumerator enumerator) | ||
{ | ||
_enumerator = enumerator; | ||
} | ||
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public KeyValuePair<TKey, TValue> Current => _enumerator.Current; | ||
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object IEnumerator.Current => _enumerator.Current; | ||
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public void Dispose() | ||
{ | ||
_enumerator.Dispose(); | ||
} | ||
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public bool MoveNext() | ||
{ | ||
return _enumerator.MoveNext(); | ||
} | ||
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void IEnumerator.Reset() | ||
{ | ||
((IEnumerator)_enumerator).Reset(); | ||
} | ||
} | ||
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private Dictionary<TKey, TValue> GetReadOnlyDict() | ||
{ | ||
var readOnly = _dictReadOnly; | ||
if (readOnly == null) | ||
{ | ||
lock (_lockObject) | ||
{ | ||
readOnly = _dictReadOnly = _dict; | ||
} | ||
} | ||
return readOnly; | ||
} | ||
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private IDictionary<TKey, TValue> GetWritableDict(bool clearDictionary = false) | ||
{ | ||
var newDict = new Dictionary<TKey, TValue>(clearDictionary ? 0 : _dict.Count + 1, _comparer); | ||
if (!clearDictionary) | ||
{ | ||
// Less allocation with enumerator than Dictionary-constructor | ||
foreach (var item in _dict) | ||
newDict[item.Key] = item.Value; | ||
} | ||
_dict = newDict; | ||
_dictReadOnly = null; | ||
return newDict; | ||
} | ||
} | ||
} |
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