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RetryingMultiProcessFileAppender.cs
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RetryingMultiProcessFileAppender.cs
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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.
//
namespace NLog.Internal.FileAppenders
{
using System;
using System.IO;
using System.Security;
/// <summary>
/// Multi-process and multi-host file appender which attempts
/// to get exclusive write access and retries if it's not available.
/// </summary>
[SecuritySafeCritical]
internal class RetryingMultiProcessFileAppender : BaseMutexFileAppender
{
public static readonly IFileAppenderFactory TheFactory = new Factory();
/// <summary>
/// Initializes a new instance of the <see cref="RetryingMultiProcessFileAppender" /> class.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="parameters">The parameters.</param>
public RetryingMultiProcessFileAppender(string fileName, ICreateFileParameters parameters) : base(fileName, parameters)
{
}
/// <summary>
/// Writes the specified bytes.
/// </summary>
/// <param name="bytes">The bytes array.</param>
/// <param name="offset">The bytes array offset.</param>
/// <param name="count">The number of bytes.</param>
public override void Write(byte[] bytes, int offset, int count)
{
int overrideBufferSize = Math.Min((count / 4096 + 1) * 4096, CreateFileParameters.BufferSize);
using (FileStream fileStream = CreateFileStream(false, overrideBufferSize))
{
fileStream.Write(bytes, offset, count);
}
}
/// <summary>
/// Flushes this instance.
/// </summary>
public override void Flush()
{
// nothing to do
}
/// <summary>
/// Closes this instance.
/// </summary>
public override void Close()
{
// nothing to do
}
/// <summary>
/// Gets the creation time for a file associated with the appender. The time returned is in Coordinated Universal
/// Time [UTC] standard.
/// </summary>
/// <returns>The file creation time.</returns>
public override DateTime? GetFileCreationTimeUtc()
{
FileInfo fileInfo = new FileInfo(FileName);
if (fileInfo.Exists)
{
return fileInfo.GetCreationTimeUtc();
}
return null;
}
/// <summary>
/// Gets the length in bytes of the file associated with the appender.
/// </summary>
/// <returns>A long value representing the length of the file in bytes.</returns>
public override long? GetFileLength()
{
FileInfo fileInfo = new FileInfo(FileName);
if (fileInfo.Exists)
{
return fileInfo.Length;
}
return null;
}
/// <summary>
/// Factory class.
/// </summary>
private class Factory : IFileAppenderFactory
{
/// <summary>
/// Opens the appender for given file name and parameters.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="parameters">Creation parameters.</param>
/// <returns>
/// Instance of <see cref="BaseFileAppender"/> which can be used to write to the file.
/// </returns>
BaseFileAppender IFileAppenderFactory.Open(string fileName, ICreateFileParameters parameters)
{
return new RetryingMultiProcessFileAppender(fileName, parameters);
}
}
}
}