// Add an URL to the cache. There are times where double work is performed.
// e.g. if we get multiple simultaneous requests for the same URL
// both might have gotten not found requests and proceeded to create
// new entries. This is a waste as we end up only using one. But this
// shouldn't occur very often and the inefficiency should be slight and
// temporary.
// In this case, the passed files are deleted and the old ones are used
public IList Add(string url, IList files)
{
CacheEntry ce=null;
lock (this)
{
ce = (CacheEntry) urls[url];
if (ce == null)
{ // entry isn't found; create new one
ce = new CacheEntry(url, files);
urls.Add(url, ce);
}
else
{ // We already had this entry; delete the new files
Console.WriteLine("debug: Double execution of url {0}", url);
ce.Timestamp = DateTime.Now; // update the timestamp
foreach (string file in files)
{
try
{
File.Delete(file);
}
catch (Exception e)
{
Console.WriteLine("An Exception occurred while clearing file cache :" +e.ToString());
}
}
}
}
return ce.Files;
}
private int DeleteUrlEntry(CacheEntry ce)
{
int numDeletedFiles=0;
urls.Remove(ce.Url);
foreach (string file in ce.Files)
{
try
{
File.Delete(file);
numDeletedFiles++;
}
catch (Exception e)
{
Console.WriteLine("An Exception occurred while clearing file cache :" +e.ToString());
}
}
return numDeletedFiles;
}