private RollingFlatFileSinkData GetRollingFlatFileSinkDataFromCursor()
{
RollingFlatFileSinkData sinkData = loggingConfigurationView.GetSinkData(ConfigurationName) as RollingFlatFileSinkData;
ArgumentValidation.CheckExpectedType(sinkData, typeof(RollingFlatFileSinkData));
return((RollingFlatFileSinkData)sinkData);
}
/// <summary>
/// Writes log message after evaluating rollover criteria and rolling over files if needed.
/// </summary>
/// <param name="logEntry">Base log file name.</param>
private void WriteMessageToFile(LogEntry logEntry)
{
bool newLog = false;
string logFile = "";
string directory = "";
string header = "";
string footer = "";
int rollOverByDays = 0;
int rollOverByMinutes = 0;
double rollOverByMegabytes = 0;
int rollOverFilesToKeep = 0;
string rollOverOneFilePerWeekDay = null;
DateTime dayOfWeekDate = DateTime.Now;
RollingFlatFileSinkData rollingFlatFileSinkData = GetRollingFlatFileSinkDataFromCursor(); //Retrieve sink parameters
try
{ //Get configuration data. If any fail then throw exception and block will log to default.
logFile = rollingFlatFileSinkData.FileName;
directory = Path.GetDirectoryName(logFile);
header = rollingFlatFileSinkData.Header;
footer = rollingFlatFileSinkData.Footer;
rollOverByDays = rollingFlatFileSinkData.RolloverByDays;
rollOverByMinutes = rollingFlatFileSinkData.RolloverByMinutes;
rollOverByMegabytes = rollingFlatFileSinkData.RolloverByMegabytes;
rollOverFilesToKeep = rollingFlatFileSinkData.NumFilesToKeep;
rollOverOneFilePerWeekDay = rollingFlatFileSinkData.OneFilePerWeekDay;
}
catch (Exception e)
{
throw new Exception("Configuration data was unable to be retrieved. Please configure FileName, RolloverByDays, RolloverByMinutes, RolloverByMegabytes, etc.", e);
}
if (directory.Length == 0) //If directory is blank then get current directory
{
directory = AppDomain.CurrentDomain.BaseDirectory;
logFile = Path.Combine(directory, logFile); //Append working directory and file name
}
lock (fileWriteSyncObject)
{
if (rollOverOneFilePerWeekDay.ToLower() == "true")
{ //Under load, using the current date here might write a message that was constructed milliseconds before day turnover into the next day's log.
//If this is undesired the dayOfWeekDate = DateTime.Now could be replaced with dayOfWeekDate = logEntry.Timestamp but a caller might not set the logEntry.Timestamp causing log rollover problems.
dayOfWeekDate = DateTime.Now;
logFile = Path.Combine(Path.GetDirectoryName(logFile), Path.GetFileNameWithoutExtension(logFile) + (int)dayOfWeekDate.DayOfWeek + Path.GetExtension(logFile));
}
if (File.Exists(logFile)) //Make sure file exists before using it
{
DateTime createdDate = File.GetCreationTime(logFile);
if (rollOverOneFilePerWeekDay.ToLower() == "true") //If special rollover by day of week
{
if (createdDate.Day != dayOfWeekDate.Day)
{
RolloverFileByDayOfWeek(logFile, dayOfWeekDate); //Delete and recreate the file
}
}
else
{
//Check for rollover on days
if (rollOverByDays > 0 && (createdDate.AddDays(rollOverByDays).Date < DateTime.Now.Date))
{
if (RolloverFile(logFile, createdDate, rollOverFilesToKeep))
{
newLog = true;
}
}
//Check for rollover on minutes if not already rolled
if (!newLog && rollOverByMinutes > 0 && (createdDate.AddMinutes(rollOverByMinutes) < DateTime.Now))
{
if (RolloverFile(logFile, createdDate, rollOverFilesToKeep))
{
newLog = true;
}
}
if (!newLog) //Check for rollover on size in MB (1MB = 1048576) if not already rolled
{
if (rollOverByMegabytes > 0 && (new FileInfo(logFile).Length / 1048576.0000000000) > rollOverByMegabytes)
{
if (RolloverFile(logFile, createdDate, rollOverFilesToKeep))
{
newLog = true;
}
}
}
}
}
else //File did not exist
{
if (!Directory.Exists(directory)) //Create directory if doesn't exist
{
Directory.CreateDirectory(directory);
}
newLog = true; //File did not exist so set flag that triggers DateTime stamp
}
using (FileStream fileStream = new FileStream(logFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
{
using (StreamWriter writer = new StreamWriter(fileStream)) //Write message to the log
{
if (header.Length > 0)
{
writer.WriteLine(header);
}
writer.WriteLine(FormatEntry(logEntry));
if (footer.Length > 0)
{
writer.WriteLine(footer);
}
writer.Flush();
if (newLog) //If we created a new file make sure it has a new time stamp
{
File.SetCreationTime(logFile, DateTime.Now);
}
}
}
}
}
/// <summary>
/// Creates node with specified configuration data.
/// </summary>
/// <param name="rollingFlatFileSinkData">Configuration data.</param>
public RollingFlatFileSinkNode(RollingFlatFileSinkData rollingFlatFileSinkData) : base(rollingFlatFileSinkData)
{
this.rollingFlatFileSinkData = rollingFlatFileSinkData;
}