public static void WaitForMutexAndRenameFile(string mutexName, TimeSpan timeToWaitBeforeThrowingException, string oldFilePath, string newFilePath, bool overwrite)
{
Mutex mutex = CBB_CommonMisc.GetExistingOrCreateNewMutex(mutexName);
if (!mutex.WaitOne(timeToWaitBeforeThrowingException, true)) //new TimeSpan(0, 0, 60)))
{
throw new Exception(String.Format("WaitForMutexAndRenameFile: Mutex {0} was locked more than {1}. That should not happen.", mutexName, timeToWaitBeforeThrowingException));
}
else
{
try
{
if (!File.Exists(oldFilePath))
{
throw new Exception("WaitForMutexAndRenameFile: Source file not found: " + oldFilePath);
}
if (!overwrite && File.Exists(newFilePath))
{
throw new Exception(String.Format("WaitForMutexAndRenameFile: File {0} already exists. Overwriting not allowed by design.", newFilePath));
}
if (overwrite && File.Exists(newFilePath))
{
File.Delete(newFilePath);
}
File.Move(oldFilePath, newFilePath);
}
finally
{
mutex.ReleaseMutex();
}
}
}
public static void AppendFile(string filePath, string text, ConcurrencyProtectionMechanism concurrencyProtectionMechanism, string mutexName = null)
{
switch (concurrencyProtectionMechanism)
{
case ConcurrencyProtectionMechanism.None:
AppendFile(filePath, text);
break;
case ConcurrencyProtectionMechanism.Lock:
if (_appendFileLockObject == null)
{
_appendFileLockObject = new Dictionary <string, object>();
}
if (!_appendFileLockObject.ContainsKey(filePath.ToUpper()))
{
_appendFileLockObject.Add(filePath.ToUpper(), new object());
}
lock (_appendFileLockObject[filePath.ToUpper()])
{
AppendFile(filePath, text);
}
break;
case ConcurrencyProtectionMechanism.Mutex:
if (String.IsNullOrEmpty(mutexName))
{
mutexName = "CBB_AppendFileMutex-" + filePath.ToUpper().Replace('\\', '_');
//throw new ArgumentException("When ConcurencyProtectionMechanism is mutex mutexName must be specified.");
}
Mutex theMutex = CBB_CommonMisc.GetExistingOrCreateNewMutex(mutexName);
theMutex.WaitOne();
try
{
AppendFile(filePath, text);
}
finally
{
theMutex.ReleaseMutex();
}
break;
default: throw new Exception(String.Format("ConcurrencyProtectionMechanism '{0}' not recognised.", concurrencyProtectionMechanism));
}
}
