#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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using System;
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using log4net.Util;
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using log4net.Layout;
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using log4net.Core;
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namespace log4net.Appender
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{
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/// <summary>
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/// This appender forwards logging events to attached appenders.
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/// </summary>
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/// <remarks>
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/// <para>
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/// The forwarding appender can be used to specify different thresholds
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/// and filters for the same appender at different locations within the hierarchy.
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/// </para>
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/// </remarks>
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/// <author>Nicko Cadell</author>
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/// <author>Gert Driesen</author>
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public class ForwardingAppender : AppenderSkeleton, IAppenderAttachable
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{
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#region Public Instance Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="ForwardingAppender" /> class.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Default constructor.
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/// </para>
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/// </remarks>
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public ForwardingAppender()
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{
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}
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#endregion Public Instance Constructors
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#region Override implementation of AppenderSkeleton
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/// <summary>
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/// Closes the appender and releases resources.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Releases any resources allocated within the appender such as file handles,
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/// network connections, etc.
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/// </para>
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/// <para>
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/// It is a programming error to append to a closed appender.
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/// </para>
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/// </remarks>
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override protected void OnClose()
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{
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// Remove all the attached appenders
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lock(this)
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{
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if (m_appenderAttachedImpl != null)
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{
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m_appenderAttachedImpl.RemoveAllAppenders();
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}
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}
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}
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/// <summary>
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/// Forward the logging event to the attached appenders
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/// </summary>
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/// <param name="loggingEvent">The event to log.</param>
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/// <remarks>
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/// <para>
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/// Delivers the logging event to all the attached appenders.
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/// </para>
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/// </remarks>
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override protected void Append(LoggingEvent loggingEvent)
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{
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// Pass the logging event on the the attached appenders
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if (m_appenderAttachedImpl != null)
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{
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m_appenderAttachedImpl.AppendLoopOnAppenders(loggingEvent);
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}
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}
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/// <summary>
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/// Forward the logging events to the attached appenders
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/// </summary>
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/// <param name="loggingEvents">The array of events to log.</param>
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/// <remarks>
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/// <para>
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/// Delivers the logging events to all the attached appenders.
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/// </para>
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/// </remarks>
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override protected void Append(LoggingEvent[] loggingEvents)
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{
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// Pass the logging event on the the attached appenders
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if (m_appenderAttachedImpl != null)
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{
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m_appenderAttachedImpl.AppendLoopOnAppenders(loggingEvents);
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}
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}
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#endregion Override implementation of AppenderSkeleton
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#region Implementation of IAppenderAttachable
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/// <summary>
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/// Adds an <see cref="IAppender" /> to the list of appenders of this
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/// instance.
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/// </summary>
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/// <param name="newAppender">The <see cref="IAppender" /> to add to this appender.</param>
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/// <remarks>
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/// <para>
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/// If the specified <see cref="IAppender" /> is already in the list of
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/// appenders, then it won't be added again.
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/// </para>
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/// </remarks>
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virtual public void AddAppender(IAppender newAppender)
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{
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if (newAppender == null)
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{
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throw new ArgumentNullException("newAppender");
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}
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lock(this)
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{
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if (m_appenderAttachedImpl == null)
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{
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m_appenderAttachedImpl = new log4net.Util.AppenderAttachedImpl();
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}
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m_appenderAttachedImpl.AddAppender(newAppender);
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}
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}
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/// <summary>
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/// Gets the appenders contained in this appender as an
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/// <see cref="System.Collections.ICollection"/>.
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/// </summary>
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/// <remarks>
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/// If no appenders can be found, then an <see cref="EmptyCollection"/>
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/// is returned.
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/// </remarks>
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/// <returns>
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/// A collection of the appenders in this appender.
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/// </returns>
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virtual public AppenderCollection Appenders
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{
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get
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{
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lock(this)
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{
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if (m_appenderAttachedImpl == null)
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{
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return AppenderCollection.EmptyCollection;
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}
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else
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{
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return m_appenderAttachedImpl.Appenders;
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}
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}
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}
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}
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/// <summary>
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/// Looks for the appender with the specified name.
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/// </summary>
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/// <param name="name">The name of the appender to lookup.</param>
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/// <returns>
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/// The appender with the specified name, or <c>null</c>.
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/// </returns>
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/// <remarks>
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/// <para>
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/// Get the named appender attached to this appender.
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/// </para>
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/// </remarks>
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virtual public IAppender GetAppender(string name)
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{
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lock(this)
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{
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if (m_appenderAttachedImpl == null || name == null)
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{
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return null;
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}
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return m_appenderAttachedImpl.GetAppender(name);
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}
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}
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/// <summary>
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/// Removes all previously added appenders from this appender.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This is useful when re-reading configuration information.
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/// </para>
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/// </remarks>
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virtual public void RemoveAllAppenders()
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{
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lock(this)
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{
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if (m_appenderAttachedImpl != null)
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{
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m_appenderAttachedImpl.RemoveAllAppenders();
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m_appenderAttachedImpl = null;
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}
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}
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}
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/// <summary>
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/// Removes the specified appender from the list of appenders.
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/// </summary>
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/// <param name="appender">The appender to remove.</param>
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/// <returns>The appender removed from the list</returns>
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/// <remarks>
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/// The appender removed is not closed.
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/// If you are discarding the appender you must call
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/// <see cref="IAppender.Close"/> on the appender removed.
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/// </remarks>
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virtual public IAppender RemoveAppender(IAppender appender)
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{
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lock(this)
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{
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if (appender != null && m_appenderAttachedImpl != null)
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{
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return m_appenderAttachedImpl.RemoveAppender(appender);
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}
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}
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return null;
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}
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/// <summary>
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/// Removes the appender with the specified name from the list of appenders.
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/// </summary>
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/// <param name="name">The name of the appender to remove.</param>
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/// <returns>The appender removed from the list</returns>
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/// <remarks>
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/// The appender removed is not closed.
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/// If you are discarding the appender you must call
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/// <see cref="IAppender.Close"/> on the appender removed.
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/// </remarks>
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virtual public IAppender RemoveAppender(string name)
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{
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lock(this)
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{
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if (name != null && m_appenderAttachedImpl != null)
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{
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return m_appenderAttachedImpl.RemoveAppender(name);
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}
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}
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return null;
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}
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#endregion Implementation of IAppenderAttachable
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#region Private Instance Fields
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/// <summary>
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/// Implementation of the <see cref="IAppenderAttachable"/> interface
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/// </summary>
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private AppenderAttachedImpl m_appenderAttachedImpl;
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#endregion Private Instance Fields
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}
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}
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