/// <summary>
/// Searches the cache of StreamWriters and disposes and removes any that haven't been used accessed since
/// the notUsedSince parameter.
/// </summary>
/// <param name="notUsedSince">The time </param>
public virtual void ClearOldStreams(DateTime notUsedSince)
{
Queue <string> _removals = new Queue <string>();
using (Locker.AcquireWriterLock(_lock))
{
foreach (KeyValuePair <string, CachedStream> kvp in _streamCache)
{
if (kvp.Value.LastAccessTime < notUsedSince)
{
kvp.Value.StreamWriter.Dispose();
// can't remove items whilst enumerating so remember them for later
_removals.Enqueue(kvp.Key);
}
}
while (_removals.Count > 0)
{
_streamCache.Remove(_removals.Dequeue());
}
}
}
/// <summary>
/// Return a stream writer for the passed path name
/// </summary>
/// <param name="path">The path name</param>
/// <returns>An existing or new stream writer</returns>
public StreamWriter GetStreamWriter(string path)
{
CachedStream cs = null;
using (Locker.AcquireReaderLock(_lock))
{
if (!_streamCache.TryGetValue(path, out cs))
{
using (Locker.UpgradeToWriterLock(_lock))
{
Stream stream = GetStream(path);
cs = new CachedStream()
{
StreamWriter = new StreamWriter(stream)
};
_streamCache.Add(path, cs);
}
}
}
cs.LastAccessTime = DateTime.Now;
return(cs.StreamWriter);
}