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From "Srinivas Sayana" <srinivas.say...@datumsoftware.com>
Subject need working sorce code for Log4Net
Date Mon, 04 Feb 2008 16:11:29 GMT


I was trying to download the log4net zip file and trying to extract it
is giving me error, can anyone help me in finding the working code.





From: Parrish, Ken [mailto:KParrish@gomez.com] 
Sent: Monday, February 04, 2008 11:10 AM
To: log4net-user@logging.apache.org
Subject: A caching / metering SMTP appender ...


Several weeks ago, I posted a  couple of notes on this list on the
subject of metering of SMTP log events and an elapsed time evaluator.
The objective was to design a log4net extension that would accommodate
the caching and metering of log events sent via SMTP.  In a situation
where a server is failing and generating large quantities of severe log
events that need to be sent via SMTP to notify operational personnel,
the problem was to find a way to collect blocks of messages and send
them in a single e-mail message.  Since then, I've notice several other
posting referring to similar problems.



Ron Grabowski sent me some snippets of code suggesting possible
approaches to the elapsed timer portion of the problem which got me
started on creating a more comprehensive solution to this problem.


Below / attached is the source code and sample configuration for a
caching SMTP appender.  There are two configurable criteria for this


FlushInterval     TimeSpan indicating maximum elapsed time between
generation of e-mail messages.  Needed in cases where there is a
quiescent period of time after the caching of critical errors.


MaxCachedMessages Integer indicate the maximum number of log messages to
cache before flushing to e-mail.  This total does not include 'context'
log events that are normally and optionally included in SMTP log event


I wanted to share this with other log4net users, but also ask for
feedback regarding it's design.  Have I overlooked any operational
issues, resource management, etc.  Is there a way to gracefully shutdown
the time when log4net is shutdown?  Any other comments or feedback would
be appreciated.




Ken Parrish




            <appender name="SmtpCachingAppender"
type="Log4NetExtensions.SmtpCachingAppender, Log4NetExtensions">

                  <to value="name@domain.com" />

                  <from value="name@domain.com" />

                  <subject value="Log4net test message" />

                  <smtpHost value="smtphost.com" />

                  <bufferSize value="512" />

                  <lossy value="true" />

                  <evaluator type="log4net.Core.LevelEvaluator">

                        <threshold value="ERROR"/>


                  <layout type="log4net.Layout.PatternLayout">

                        <param name="ConversionPattern"
value="%date{yyyy-MM-dd HH:mm:ss.fff} [%t] %-5level %logger -
%message%newline%exception" />


                  <FlushInterval value="00:05:00" />

                  <MaxCachedMessages value="20" />






using System;

using System.Collections.Generic;


using log4net.Appender;

using log4net.Core;


namespace Log4NetExtensions


      public class SmtpCachingAppender : SmtpAppender


            int _maxCachedMessages = 20; // Config option

            TimeSpan _flushInterval = new TimeSpan(0, 5, 00); // Config

            System.Threading.Timer _timer;

            bool _timedFlush = false;

            int _numCachedMessages = 0;

            List<LoggingEvent> _loggingEvents = new


            /// <summary>

            ///         TimeSpan indicating the maximum period of time
elapsed before sending

            ///         any cached SMTP log events.

            /// </summary>

            public TimeSpan FlushInterval


                  get { return this._flushInterval; }

                  set { this._flushInterval = value; }



            /// <summary>

            ///         Maximium number of SMTP events to cache before
sending via SMTP.

            /// </summary>

            public int MaxCachedMessages


                  get { return this._maxCachedMessages; }

                  set { this._maxCachedMessages = value; }



            /// <summary>

            ///         Create a timer that fires to force flushing
cached log events

            ///         via SMTP at a specified interval.

            /// </summary>

            public override void ActivateOptions()


                  this._timer = new System.Threading.Timer(

                        new System.Threading.TimerCallback(OnTimer),








            void OnTimer(Object stateInfo)


                  this._timedFlush = true;




            protected override void SendBuffer(LoggingEvent[] events)


                  foreach (LoggingEvent loggingEvent in events)






                  if ((this._numCachedMessages >=
this._maxCachedMessages) || this._timedFlush)


                        if (this._loggingEvents.Count > 0)


                              LoggingEvent[] bufferedEvents =






                        // Reset cache buffer conditions.

                        this._numCachedMessages = 0;

                        this._timedFlush = false;






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