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Updated to NLog 5.0 preview 2 (#701)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // | ||
| // Copyright (c) 2004-2021 Jaroslaw Kowalski <[email protected]>, 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. | ||
| // | ||
|
|
||
| namespace NLog.Web.Internal | ||
| { | ||
| using NLog.Common; | ||
| using System; | ||
|
|
||
| /// <summary> | ||
| /// A cyclic buffer of <see cref="LogEventInfo"/> object. | ||
| /// </summary> | ||
| internal class LogEventInfoBuffer | ||
| { | ||
| private readonly object _lockObject = new object(); | ||
| private readonly bool _growAsNeeded; | ||
| private readonly int _growLimit; | ||
|
|
||
| private AsyncLogEventInfo[] _buffer; | ||
| private int _getPointer; | ||
| private int _putPointer; | ||
| private int _count; | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="LogEventInfoBuffer" /> class. | ||
| /// </summary> | ||
| /// <param name="size">Buffer size.</param> | ||
| /// <param name="growAsNeeded">Whether buffer should grow as it becomes full.</param> | ||
| /// <param name="growLimit">The maximum number of items that the buffer can grow to.</param> | ||
| public LogEventInfoBuffer(int size, bool growAsNeeded, int growLimit) | ||
| { | ||
| _growAsNeeded = growAsNeeded; | ||
| _buffer = new AsyncLogEventInfo[size]; | ||
| _growLimit = growLimit; | ||
| _getPointer = 0; | ||
| _putPointer = 0; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets the capacity of the buffer | ||
| /// </summary> | ||
| public int Size => _buffer.Length; | ||
|
|
||
| /// <summary> | ||
| /// Gets the number of items in the buffer | ||
| /// </summary> | ||
| internal int Count { get { lock (_lockObject) return _count; } } | ||
|
|
||
| /// <summary> | ||
| /// Adds the specified log event to the buffer. | ||
| /// </summary> | ||
| /// <param name="eventInfo">Log event.</param> | ||
| /// <returns>The number of items in the buffer.</returns> | ||
| public int Append(AsyncLogEventInfo eventInfo) | ||
| { | ||
| lock (_lockObject) | ||
| { | ||
| // make room for additional item | ||
| if (_count >= _buffer.Length) | ||
| { | ||
| if (_growAsNeeded && _buffer.Length < _growLimit) | ||
| { | ||
| // create a new buffer, copy data from current | ||
| int newLength = _buffer.Length * 2; | ||
| if (newLength >= _growLimit) | ||
| { | ||
| newLength = _growLimit; | ||
| } | ||
|
|
||
| InternalLogger.Trace("Enlarging LogEventInfoBuffer from {0} to {1}", _buffer.Length, newLength); | ||
| var newBuffer = new AsyncLogEventInfo[newLength]; | ||
| Array.Copy(_buffer, 0, newBuffer, 0, _buffer.Length); | ||
| _buffer = newBuffer; | ||
| } | ||
| else | ||
| { | ||
| // lose the oldest item | ||
| _getPointer = _getPointer + 1; | ||
| } | ||
| } | ||
|
|
||
| // put the item | ||
| _putPointer = _putPointer % _buffer.Length; | ||
| _buffer[_putPointer] = eventInfo; | ||
| _putPointer = _putPointer + 1; | ||
| _count++; | ||
| if (_count >= _buffer.Length) | ||
| { | ||
| _count = _buffer.Length; | ||
| } | ||
|
|
||
| return _count; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets the array of events accumulated in the buffer and clears the buffer as one atomic operation. | ||
| /// </summary> | ||
| /// <returns>Events in the buffer.</returns> | ||
| public AsyncLogEventInfo[] GetEventsAndClear() | ||
| { | ||
| lock (_lockObject) | ||
| { | ||
| int cnt = _count; | ||
| if (cnt == 0) | ||
| return new AsyncLogEventInfo[0]; | ||
|
|
||
| var returnValue = new AsyncLogEventInfo[cnt]; | ||
|
|
||
| for (int i = 0; i < cnt; ++i) | ||
| { | ||
| int p = (_getPointer + i) % _buffer.Length; | ||
| var e = _buffer[p]; | ||
| _buffer[p] = default(AsyncLogEventInfo); // we don't want memory leaks | ||
| returnValue[i] = e; | ||
| } | ||
|
|
||
| _count = 0; | ||
| _getPointer = 0; | ||
| _putPointer = 0; | ||
|
|
||
| return returnValue; | ||
| } | ||
| } | ||
| } | ||
| } |
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