#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion
using System;
using System.Messaging;
using log4net.Core;
namespace SampleAppendersApp.Appender
{
///
/// Appender writes to a Microsoft Message Queue
///
///
/// This appender sends log events via a specified MSMQ queue.
/// The queue specified in the QueueName (e.g. .\Private$\log-test) must already exist on
/// the source machine.
/// The message label and body are rendered using separate layouts.
///
public class MsmqAppender : log4net.Appender.AppenderSkeleton
{
private MessageQueue m_queue;
private string m_queueName;
private log4net.Layout.PatternLayout m_labelLayout;
public MsmqAppender()
{
}
public string QueueName
{
get { return m_queueName; }
set { m_queueName = value; }
}
public log4net.Layout.PatternLayout LabelLayout
{
get { return m_labelLayout; }
set { m_labelLayout = value; }
}
override protected void Append(LoggingEvent loggingEvent)
{
if (m_queue == null)
{
if (MessageQueue.Exists(m_queueName))
{
m_queue = new MessageQueue(m_queueName);
}
else
{
ErrorHandler.Error("Queue ["+m_queueName+"] not found");
}
}
if (m_queue != null)
{
Message message = new Message();
message.Label = RenderLabel(loggingEvent);
using(System.IO.MemoryStream stream = new System.IO.MemoryStream())
{
System.IO.StreamWriter writer = new System.IO.StreamWriter(stream, new System.Text.UTF8Encoding(false, true));
base.RenderLoggingEvent(writer, loggingEvent);
writer.Flush();
stream.Position = 0;
message.BodyStream = stream;
m_queue.Send(message);
}
}
}
private string RenderLabel(LoggingEvent loggingEvent)
{
if (m_labelLayout == null)
{
return null;
}
System.IO.StringWriter writer = new System.IO.StringWriter();
m_labelLayout.Format(writer, loggingEvent);
return writer.ToString();
}
}
}