//
// Copyright (c) 2004,2005 Jaroslaw Kowalski <jkowalski@users.sourceforge.net>
//
//
// 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 the 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.
//
using System;
using System.Text;
using System.Runtime.InteropServices;
using NLog.LayoutRenderers;
using NLog.Config;
namespace NLog.Win32.LayoutRenderers
{
/// <summary>
/// ASP Application variable.
/// </summary>
[LayoutRenderer("asp-application")]
public class ASPApplicationValueLayoutRenderer: LayoutRenderer
{
private string _appVariable;
/// <summary>
/// The variable name.
/// </summary>
[RequiredParameter]
public string Item
{
get
{
return _appVariable;
}
set
{
_appVariable = value;
}
}
/// <summary>
/// Returns the estimated number of characters that are needed to
/// hold the rendered value for the specified logging event.
/// </summary>
/// <param name="ev">Logging event information.</param>
/// <returns>The number of characters.</returns>
/// <remarks>
/// Because ASP target uses COM Interop which is quite expensive, this method always returns 64.
/// </remarks>
protected override int GetEstimatedBufferSize(LogEventInfo ev)
{
return 64;
}
/// <summary>
/// Renders the specified ASP Application variable and appends it to the specified <see cref="StringBuilder" />.
/// </summary>
/// <param name="builder">The <see cref="StringBuilder"/> to append the rendered data to.</param>
/// <param name="ev">Logging event.</param>
protected override void Append(StringBuilder builder, LogEventInfo ev)
{
ASPHelper.IApplicationObject app = ASPHelper.GetApplicationObject();
if (app != null)
{
if (_appVariable != null)
{
object variableValue = app.GetValue(_appVariable);
builder.Append(Convert.ToString(variableValue));
}
Marshal.ReleaseComObject(app);
}
}
}
}